Environmental Monitoring Devices Research Articles

Selective Ammonia Detection at Ppb-Level with Si-Doped MoO3 Sensors for Food and Environmental Applications

Introduction Ammonia (NH3) is an important marker for food spoilage[1] as well as a toxic environmental pollutant emitted from concrete walls, fertilizers or refrigeration systems[2]. Therefore, low-cost compact sensors for the detection of hazardous NH3 are urgently needed. Metal-oxide (chemo-resistive) gas sensors are attractive for NH3 detection as they offer simple operation, low power consumption and can be integrated into portable devices.[3] In specific, the α-phase of MoO3 is promising for detection of NH3 down to 50 parts per billion (ppb) at dry conditions. However, due to the high operating temperatures of MoO3 gas sensors (250 to 500 °C), the material must be stabilized by doping or the addition of foreign oxides. Here, we show how tailoring material morphology, phase composition and particle size enables high NH3 sensing performance[4]. Method Pure and Si-doped MoO3 (0 – 20 wt%) nanoparticles were made by flame spray pyrolysis (FSP) and directly deposited onto Al2O3 sensor substrates with interdigitated Pt electrodes[4]. Subsequently, the sensor films were annealed at 450 °C for 5 h in an oven for thermal stabilization. The nanoparticles were analyzed using X-ray diffraction (XRD) patterns, nitrogen adsorption (Brunauer-Emmett-Teller, BET) as well as transmission electron microscopy (TEM) and electron diffraction (ED). The sensing performance was characterized as a function of SiO2 content with synthetic gas mixtures at a sensor temperature of 400 °C on a dynamic mixing setup. Furthermore, the selectivity towards possible interfering molecules of different chemical classes (e.g. acetone, CO and NO) was evaluated. Results and Conclusions The as-prepared, pure MoO3 powder shows fine crystallinity confirmed by transmission electron microscopy (TEM) (Figure 1a) and ED patterns (Figure 1b). By annealing the sensor substrates at 450 °C for 5 h, pure MoO x particles grow to ribbon-like structures (Figure 1d) with large crystallites, as indicated by XRD (triangles) and BET (open circles) and confirmed by bright spots in ED patterns (Figure 1c). Doping with Si reduces particle and crystal growth significantly, decreasing the crystal size from 147 to 65 nm and the particle size from 272 to 83 nm resulting in superior thermal stability. Excess Si (above 3 wt%) is not incorporated into the MoO3 lattice, but forms amorphous SiO2 domains, inhibiting further crystal growth, as subjected by the constant dXRD (Figure 1) and visible by TEM. Due to those structural changes, the sensor response and selectivity depend on the SiO2 doping content.Figure 2 shows the response of pure and Si-doped MoO3 sensors to 1000 ppb NH3 (triangles), acetone (circles), NO (squares) and CO (diamonds) at 400 °C. Increasing the SiO2 content from 0 to 3 wt% almost triples the NH3 response from 0.22 to 0.53 with only minor changes for the other analytes. This results from the reduced sinter neck size of MoO3 due to segregated SiO2 domains which locally narrow the conduction channel leading to an increased electron depletion and change the morphology resulting in a higher surface-to-volume ratio[4]. Therefore, charge carrier mobility and thus film resistance are dominated by surface phenomena increasing the sensor’s sensitivity. Moreover, Si-doping (3 wt%) improved the NH3 selectivity toward other interfering gases achieving a response ratio to acetone (S NH3 / SA ) of 3.6 and to NO of 7.9 and no sensitivity for CO (Figure 2). Above 3 wt% SiO2 content, the film resistance continuously increases (inset in Figure 2) due to the formation of large and inert SiO2 domains. In addition to the enhanced response and selectivity towards NH3, the sensor could clearly detect NH3 down to 400 ppb even in the presence realistic relative humidity (up to 90%)[4]. As a result, this sensor is promising for integration into a portable device for food spoilage detection and environmental monitoring.

Trace-level ammonia detection at room temperature based on porous flexible polyaniline/polyvinylidene fluoride sensing film with carbon nanotube additives

Enhanced ammonia (NH3) sensing properties based on porous flexible polyaniline/polyvinylidene fluoride (PANI/PVDF) composite films, which used multi-wall carbon nanotubes (MWCNTs) as additives, were prepared by an in-situ polymerization process. The obtained flexible PANI/PVDF based sensing films showed a hierarchical porous structure, which enhanced their NH3 sensing performance. The results show that the addition of MWCNTs to the PANI/PVDF film further improved its stability and response to NH3. The response of the optimized MWCNT-PANI/PVDF film was found to increase by twofold to 33 %, and its recovery time was decreased 7-fold to 26 s than those of the PANI/PVDF sensing film for 1 ppm NH3 at 25 ℃. Its lower detectable NH3 concentration was 0.1 ppm, with a response value of 8 % at 25 ℃. Additionally, the MWCNT-PANI/PVDF film sensor presented good flexibility, showing only minor response value decline after 500 bending cycles. This work shows that the fabricated flexible MWCNT-PANI/PVDF film is promising for detecting trace-level NH3 gas at room temperature, and can be integrated with smart wearable devices for real-time environmental monitoring.

Controllable in situ fabrication of portable AuNP/mussel-inspired polydopamine molecularly imprinted SERS substrate for selective enrichment and recognition of phthalate plasticizers

A bio-inspired polydopamine (PDA) molecularly imprinted substrate is fabricated by one-step oxidative self-polymerization of dopamine and template molecules in weakly alkaline medium on screen-printed electrode (SPE). Through the catechol and amine groups on PDA surface, Au nanoparticles (AuNPs) can be easily anchored and growth on PDA-MIP coating, thereby forming a three-dimensional (3D) architecture. By adjusting the reaction conditions, the particle size and distribution of PDA and AuNPs can be well controlled. Benefiting from the “hot spots” generated by AuNPs and recognition sites produced by MIP, the AuNP/PDA-MIP nanocomposite can serve as excellent SERS substrate enabling selective enrichment and identification of phthalate plasticizers (PAEs). Using this substrate, an enhancement factor (EF) up to 1.70 × 107 for dimethyl phthalate (DMP) is achieved with a detection limit as low as 1.0 × 10−10 M. Furthermore, the rebinding kinetics study demonstrates that the portable MIP-based SERS substrate can promptly reach the adsorption equilibrium within 10 min. Thanks to its highly selectivity, the substrate exhibits low SERS interference for structural analogues benzyl butyl phthalate (BBP) and di(2-ethylhexyl) phthalate (DEHP). Besides, the straightforward SERS recognition of DMP in surface water, commercial bottled water and liquor samples are successfully realized using this substrate. This green and environmental-friendly fabrication method is promising for synthesis of highly performance sensing substrate, adsorbent or catalysts. Combining with portable Raman spectrometer, the fabricated MIP-based SERS substrate has exhibited a great potential as on-site device for environmental monitoring, food safety and homeland security.

Analysis of energy-peaks characteristic in NaI(Tl) spectrometer for radionuclide identification in environmental radiation monitoring device

The development of nuclear facilities has been emerging rapidly in this century, it’s causing the development of technology which concerns the quality of the environment is a must. Because this condition is related to the polluted nuclear radiation in the environment, especially in urban, and nuclear facilities. This causes an environmental radiation monitoring device is needed to determine abnormalities. Currently, the environmental radiation monitoring devices in the station only could monitors gross gamma radiation. The device cannot distinguish whether the increase in dose rate is due to abnormal events, or due to natural radiation. Therefore, we need a device that can have the ability of spectroscopy, thus it can distinguish the radionuclide source that causes an increase in the dose rate like NaI(Tl) gamma spectrometer. The device has been configured using a NaI(Tl) detector with a peak characteristic observation method with various conditions of acquisition time and dose rate. This was tested in laboratories using Cs-137 as a sample. Tests have been done by varying the value of time and dose rate when measure. Time used varies, 1 minute, 5 minutes, 10 minutes, 30 minutes, 60 minutes, 90 minutes and 120 minutes with a varying dose rate of 0.1479, 0.1115, 0.0956 and 0.0802 |aSv/h. Data has been analyzed using the high summing ratio method to be able to distinguish measurement values using sample and background measurements. The result shows that the detector has stable when measuring for 30 minutes with FWHM value 60, and the dose rate is not less than 0.0802 |aSv/h, and it was able to distinguish background and source value from 1 -minute acquisition using a high summing ratio method.

Primary tool base for the initial stage of environmental monitoring in a megalopolis

The methodical issues of monitoring urban facilities on noise pollution and the state of radiation conditions as an integral part of general environmental monitoring conducted as a part of the training course “Environmental Monitoring Devices” are considered. The results of the study of the water quality of the Great Garden Pond in the Northern Administrative Okrug (district) of Moscow on the state of zooplankton and zoobenthos in autumn of 2019 are presented. The state of the water body was conducted on species composition and number of the major taxa of zooplankton and zoobenthos. Noise pollution was assessed in connection with the reconstruction of Bolshaya Akademicheskaya Street.

Thermal Design of Microreactor Structural Elements for Water Quality Analyser

The research object is a Lab-chip device for environmental water quality monitoring. The main objective of the actual work is to determine a set of functional, geometric and technological parameters of Lab-chip microreactor to provide optimal temperature field conditions for predefined chemical reaction protocols. Since Lab-chip operates with a microdose of liquids or reagents and temperature processes in fluid flows are highly inertial, the problem of setting, maintaining and ensuring fast transient of certain temperature values in different areas of Lab-chip microchannels is nontrivial. The main focus was pointed on precise heating of defined Lab-chip areas (reaction chambers) and strict compliance with the non-stationary thermal regime, required for chemical reaction protocols. Modelling and simulation were done in COMSOL Multiphysics tool. As a result of the conducted research, there was obtained a set of parameters that provides the required thermal regime of reaction microchamber for the physicochemical determination of selected hazardous species in environmental water samples.

Development of Remote Wireless Environmental Conditions Measurement, Monitoring and Recording Device for Metrological and Other Scientific Applications

Measurement, monitoring and recording of the environmental condition is the essential and sometimes statutory requirements, to observe the small change or deviation in the results of measurements in calibration and testing laboratories as well as other scientific applications. This motivated the authors to develop a precision wireless environment conditions, measurement, monitoring and recording (WEMMR) device. The present paper describes the design and development of an indigenous precision WEMMR device. The WEMMR is comprised of a micro-electromechanical sensor (MEMS; BME-280) capable to measure, monitor and record three parameters related to prevailing environmental conditions in the room, i.e., ambient temperature (T) in the range (0–100) °C, ambient pressure (P) in the range (300–1100) mbar and relative humidity (H) from (0–100)%. The system was developed using microcontroller (ATmega328) and Wi-Fi module (ESP8266) for wireless operation. These environmental conditions were also used to determine the prevailing air density (ρair) in the room and display the same on the monitoring panel. The monitoring and recording of ρair are extremely important parameters in measurement and realization of mass and mass-related quantities, i.e., force, pressure, flow and ultrasonic power. Apart from monitoring, recording of the data device is also capable to transmit the data to remotely located computer through internet connectivity. The developed WEMMR device had been calibrated against national standards available at the National Physical Laboratory, India, for ambient temperature, ambient pressure and humidity ranged for (10–50) °C, (300–1100) mbar and (30–80)%, respectively. The uncertainty in the ambient temperature, ambient pressure and relative humidity has been evaluated as ± 0.37 °C, ± 0.31 mbar and ± 0.71%, respectively.

Internet of things in the archives: novel tools for environmental monitoring of archival collections

Purpose Cultural heritage archives rely on environmental monitoring devices, such as dataloggers or more complex networked systems, to ensure collection preservation through collecting temperature, humidity, light and/or air quality measures. Existing systems are often costly, inflexible and do not use a modern, internet of things (IoT) approach. This paper aims to determine the suitability of currently popular general-purpose IoT devices, standards and technologies to the environmental monitoring needs of archivists, as well as identify any challenges. Design/methodology/approach This paper describes an exploratory study detailing the design, construction and usability testing of a do-it-yourself datalogger and data dashboard system, which seeks to manage previously identified trade-offs in cost, required technical skill and maintainability. Findings The environmental monitoring system presented met archivists’ needs well and was generally noted to be easy-to-use, efficient and an improvement on existing systems. This suggests that an IoT approach can support archivists’ needs in this area. Research limitations/implications Potential limitations of this study include lack of archival staff with sufficient technical training to maintain such a system and the rapid pace of IoT evolution yielding unstable and constantly changing technologies. Practical implications The system design presented in this work provides a blueprint for cultural heritage organizations desiring a fuller-featured, lower cost environmental monitoring system for archival collections. Originality/value This research takes a novel user-centered, open-source, IoT approach to construct an environmental monitoring system that is designed directly from archivists’ requirements and is extensible for future needs.

Coupled Lines for Wearable Power Dividers: Coupled Transmission-Line Sections for Power Dividers in Wearable and Flexible RF Electronics

In 2013, the Global Standards Initiatives on Internet of Things (IoT) defined the IoT as global infrastructure for the information society, enabling advanced services by interconnecting things based on existing and evolving interoperable information and communication technologies, with the term thing described as an object in the information world that is capable of being indentified and integrated into communication networks. Things in the IoT sense can, therefore, refer to a wide variety of devices for media, environmental monitoring, infrastructure management, manufacturing, energy management, medicine and health care, building and home automation, transportation, metropolitan-scale deployments, and consumer applications that demand accurate and reliable methods to sense changes, even in extremely rugged environments [1].

Energy-Efficient Edge Offloading in Heterogeneous Industrial IoT Networks for Factory of Future

The ultra-reliable and low latency communication (URLLC) and massive machine type communication (mMTC) in 5G are envisioned to support intelligent automation in the heterogeneous Factory of Future (FoF) networks, and Mobile-edge computing (MEC) is considered to be a promising system for enabling real-time task processing at the edge of the network. In the future factory, production machines, and environmental monitoring devices will be endowed with the wireless connecting for mobility. These devices are deployed for running complicated real-time tasks. To make such mission-critical tasks being processed in time, parts of the tasks should be completed with the assistance of the edge server or even the cloud. In this work, we jointly investigate the partial task offloading, computation, and communication (licensed and unlicensed) resource allocation problem in the trade-off between overall power consumption and quality of service (QoS) satisfaction. A 2-tier MEC-cloud framework is provided, wherein the IoT mobile devices (MDs) are able to partition the tasks into segments and offload them to the MEC and the cloud server. Considering the limits of communication and computation resources, we proposed a mechanism call 5G and NR-U opportunity-cost-based offloading algorithm (5G/NR-U OCBOA) to optimize resource allocation. Within the mechanism, there are two proposed algorithms, 5G OCBOA is for the licensed-only case, and NR-U OCBOA dedicates on unlicensed one. We iteratively perform the two algorithms to get the final solution. The simulation results show that our low-complexity algorithms almost outperform the other benchmark greedy algorithms. The proposed algorithm is up to 59.3% MD blocking probability less, up to 58.7% power saving gain, and up to 47.6% more QoS gain.

Review—Room-Temperature Ionic Liquids for Electrochemical Application with Special Focus on Gas Sensors

Room temperature ionic liquids (RTILs) are the most common electrolyte now a day, which is usually a molten salt comprised of cationic and anionic charge, generate a neutral species having high thermal stability and exceptional chemical property. Due to these unique properties, RTILs had been used for many applications as a solvent/electrolyte for decades. There are many RTILs, which possess good conductivity, as well as an optimum electrochemical window, which, is suitable for electrochemical sensor application. Among various electrochemical sensors available in the market, the electrochemical gas sensor is a popular device for environmental monitoring. The use of RTILs to the existing technology leads us to new era of sensing where we can able to address sensitivity, stability, robustness, and ability to do multiplex array along with the fundamental behind the electrochemical gas sensor. This paper is consisted of the electrical and electrochemical properties of some popular RTILs along with its application in electrochemical sensing, with a special focus on the electrochemical gas sensor. This review will help the general audience to fabricate the next-gen electrochemical sensor using RTILs.

EarthScope-Oceans: An array of floating MERMAID instruments for earthquake seismology

Mapping the Earth's uncharted interior through global seismic tomography is dependent on increasing the number of seismic stations in the oceans. We have developed a low-cost, autonomously floating hydrophone to capture earthquake signals suitable for the study of the interior of the Earth and the tectonically and magmatically active underwater realm, while it maintains its potential to be an environmental monitoring device. MERMAID is a freely drifting diver that combines (1) a hydrophone, (2) GPS, (3) an on-board digitizing and processing unit that uses wavelet detection and discrimination algorithms, and (4) an iridium unit for near real-time data transfer with two-way communication. The instrument, 50 kg in air, submersible to 3000 m water depth, with a projected lifetime of up to 5 years, is commercially available from OSEAN SAS. Some 60 units will have been deployed in the Pacific Ocean by the Fall of 2019. With up to 7 kg of sensor payload, additional configurable sensors today include a Sea-Bird SBE 41 CTD, and, in the future, a suite of other instruments with utility in bioacoustics, environmental monitoring, meteorology, bathymetric determination, and chemical and physical oceanography. We report on the performance of our instruments as regards teleseismic event recovery, and on the development of a new method for extracting high-resolution travel times from the first ~1500 seismograms reported live from the Pacific Ocean.

Sensors and Systems for Wearable Environmental Monitoring Toward IoT-Enabled Applications: A Review

Environmental pollution is a major issue for public health and safety. Measurement of fine-grain spatiotemporal distribution of pollution for a micro-environment is necessary to explore the correlations among environment, health, and behavior. The continuous advancement of miniature environmental sensing devices, microelectronics, and communication technologies propelled the development of wearable devices for environmental monitoring applications. This type of devices are able to acquire high-resolution objective geo-tagged data. The aim of this review is to summarize the contemporary research and developments on wearable devices intended for environmental Internet of Things (IoT) applications. This paper provides comprehensive descriptions of the state-of-the-art wearable environmental monitoring systems (WEMS) and compares them in terms of sensing and communication technologies. The reviewed WEMS are mainly classified into two groups based on whether they used commercial off-the-shelf (COTS) sensors or self-developed sensors. The first group is further categorized based on their wearability. In line with this, a consolidated description is provided by presenting the main features of the available wearable environmental monitoring devices from the industry. In addition, several issues are identified for WEMS and future research directions are provided. Thus, this review paper examines the current research on WEMS and can serve as a reference for the researchers and developers to provide perspectives toward future research improvements.

Survey of Occupational and Environmental Exposure Monitoring Solutions.

Service members are exposed to ambient airborne pollutants that have been linked to adverse health effects; however, capabilities to identify and characterize exposures across multi-domain operations are currently lacking. Occupational and environmental exposure monitoring is problematic because there is not a single simple solution, and current technological limitations suggest that simultaneous deployment of multiple devices may be the most effective near-term strategy. A broad industry scan of wearable, handheld, or portable occupational and environmental exposure monitoring devices was conducted, and subject matter experts were interviewed about the state of the field. This survey identified limitations including the inability to detect multiple analytes or analyte classes, size and weight, and detection limits, but multiple implementation strategies could be employed to meet a variety of combat needs. Device types could be layered, or specific device types could be deployed in acute toxic exposure environments such as dense urban population centers or subterranean spaces. Evolving technologies and data management strategies may advance personal exposure monitoring in the future. These new devices and methods will likely supplant current technologies, while still using the programmatic and data framework established with early implementation of current commercial off the shelf devices.

Ultrasensitive Detection of Volatile Organic Compounds by a Freestanding Aligned Ag/CdSe-CdS/PMMA Texture with Double-Side UV-Ozone Treatment.

Volatile organic compounds (VOCs) are organic chemicals having a high vapor pressure at room temperature. Chronic exposure to VOC vapor can be potentially dangerous to human health. In this study, we build a high-performance freestanding aligned Ag/CdSe-CdS/poly(methyl methacrylate) (PMMA) texture to detect VOC vapors. The insight of this new VOC-sensing material is based on electrospinning techniques, ultraviolet (UV)/ozone treatments, and nano-optics. The incorporation of CdSe-CdS core-shell quantum rods (QR) and silver nanocrystals in the PMMA nanofibers amplifies the polarization response of long rods in VOC detection, thus increasing the sensitivity of VOC-sensing materials. Further, the uniaxial aligned Ag/QR/PMMA sensing material was treated by UV-ozone etching to increase surface absorption. The advanced double-sided UV-ozone etching on the uniaxial aligned Ag/QR/PMMA efficiently enhanced the extinction changes of VOCs. Two categories of solvents, typical VOCs and alcoholic VOCs, were put into practical tests for the Ag/QR/PMMA VOC-sensing materials. The Ag/QR/PMMA reached the detection limit for 100 ppm butanol within 1 min. The freestanding aligned Ag/CdSe-CdS/PMMA texture is a newly designed nanocomposite device for environmental risk monitoring. It can be accepted by the market compared to the other highly sensitive commercial VOC-sensing materials.

Microbial fuel cells as a sustainable platform technology for bioenergy, biosensing, environmental monitoring, and other low power device applications

Microbial Fuel Cell (MFC) technology is a promising sustainable energy alternative to combat issues pertaining to non-renewable energy consumption, climate change, and environmental pollution. MFC technology employs anaerobic microorganisms, which convert biodegradable substances into simpler substances and produce bioelectricity. MFCs show promise for low-cost energy yielding wastewater treatment. Recent research efforts have shown that the technological know-how of MFC technology has evolved beyond the primary applications of wastewater treatment and energy generation. Hence, research attention has shifted towards other specific value-added applications of MFCs such as small implantable health devices, robotics, and environmental quality monitoring sensors, etc. This article concisely addresses the potential applications of MFC technology past power production and wastewater treatment for biofuels such as biogas, and hydrogen production, and in the fields of medical implantable devices, robotics, and as biosensors for heavy metals and detection of toxic chemicals among others.

Establishment of a low dose rate gamma ray calibration field for environmental radiation monitoring devices.

Establishment of a low dose rate gamma ray calibration field for environmental radiation monitoring devices.

ESTABLISHMENT OF A LOW DOSE RATE GAMMA RAY CALIBRATION FIELD FOR ENVIRONMENTAL RADIATION MONITORING DEVICES.

For routine calibration of dosemeters used for environmental radiation monitoring, a low dose rate 137Cs gamma ray calibration field that fully satisfies the requirement of the ISO 4037 series was established in the Facility of Radiation Standards in Japan Atomic Energy Agency. Two different methods were employed to determine the reference air kerma rate, namely a conventional ionisation chamber and a G(E) function method used a newly developed scintillation spectrometer. To fulfil the requirement of the ISO 4037 and suppress scattering of Cs gamma ray within the room as far as possible, a suitable lead collimator was introduced to limit the irradiation area at test points and placed at the middle height in an irradiation room with a grating floor. From measured results of de-convoluted photon fluence spectrum and the variation of evaluated reference air kerma rates between 1.0 m and 3.0 m from the centre of the source, gamma ray scattering from the room structures was found to be negligible. The reference air kerma rate at distances between1.0 m and 3.0 m could be then interpolated by simply considering the inverse square law of the distance and air attenuation. The resulting Cs gamma ray calibration field could provide ambient dose equivalent rates of 0.7-7.2 μSv h-1 for use with environmental radiation monitoring devices. Finally, we attempted to calibrate a widely used NaI(Tl) scintillation survey metre, obtaining a quite satisfactory calibration factor. These results also imply that such survey metres can be employed to monitor affected areas and assess the progress of decontamination, as they can provide appropriate measurements of the ambient dose equivalent rate.

Design and implementation of monolithically integrated sealed and unsealed chambers by using the wafer level packaging

This study presents the approaches to simultaneously realize various MEMS devices respectively encapsulated inside sealed and unsealed chambers by using the existing microfabrication and wafer level capping processes. In general, the wafer level capping process could encapsulate MEMS devices inside sealed chambers. In this study, the air leakage paths from the encapsulated chamber to the ambient have been selectively patterned and fabricated using the existing processes, so that the unsealed chambers are also achieved. The unsealed chamber is connected to the ambient and can be employed to encapsulate environmental monitoring devices such as humidity or pressure sensors. However, the sealed chamber is isolated with the ambient. The pressure in the sealed chamber is determined by the vacuum condition during the wafer level capping process. The sealed chamber could encapsulate devices such as motion sensors and resonators in the required vacuum condition. Thus, the presented approaches could enable existing process platforms to monolithically fabricate and encapsulate more devices for various applications. Devices such as micromachined Pirani gauge, resonator, and pressure sensor are fabricated and characterized to verify the present approaches. Measurement results indicate that sensors in different pressure conditions are respectively achieved by unsealed chambers and sealed chambers.

A rotational pendulum based electromagnetic/triboelectric hybrid-generator for ultra-low-frequency vibrations aiming at human motion and blue energy applications

There is abundance of low-frequency biomechanical and blue energy that can be harvested from our ambient environment. Utilization of these energy plays a significant role for the sustainability of the wearable devices and environmental monitoring devices. Here, we presented a rotational pendulum triboelectric-electromagnetic hybrid generator (RPHG) which is able to scavenge low-frequency (<5 Hz) vibration energy from both arbitrary human motion and ocean waves. Four stacked disk-shaped rotor magnets are introduced into the generator for the rotational motion. The pendulum rotor can easily rotate around the bearing by gravity or inertia force with a broadband frequency excitation, and coupled with surrounding coils to operate electromagnetic generator (EMG). In the meantime, triboelectric nanogenerator (TENG) is realized by utilizing the rotor to trigger the contact-separation mode of the copper ring and surrounding fluorinated ethylene propylene (FEP) film. The hybridized generator is very sensitive to irregular human motion and ultra-low-frequency ocean waves. After the optimization of the configuration of the hybrid generator, the maximum power density of 3.25 W/m2 and 79.9 W/m2 are obtained at a driving frequency of 2 Hz and amplitude of 14 cm by the TENG and EMG, respectively, which can charge a capacitor of 22 μF to 7 V rapidly in 30 s. The RPHG can light up about more than hundreds of commercial lights emitting diodes (LEDs). Then, the RPHG was placed on human body and tested by running on treadmill and rope skipping. The open-circuit voltage of the EMG can be about 9 V and that of TENG can reach 150 V. Finally, the RPHG was tested on a homemade buoy in Tai Lake. When the wave frequency is about 1 Hz and the wave height is 20 cm, the open-circuit voltage of EMG can reach over 3 V and that of TENG can reach 80 V regardless of whether the RPHG is placed vertically or horizontally. Generally, the proposed device demonstrates the effectiveness towards energy harvesting from ambient environment of multidirectional and wide frequency range, i.e., human motion and blue energy, showing the great potential of being a sustainable power source for those wearable devices and monitoring devices in blue ocean.