Cyclic Voltammetry Tests Research Articles

Energy storage characteristics and mechanism of organic-conjugated polyanthraquinoneimide for metal-free dual-ion batteries

Organic materials have gained significant attention in the battery energy storage field due to their good reaction kinetics and designable properties. However, conventional organic materials typically exhibit poor cycling stability in dual-ion batteries because of their high solubility and low electron conductivity. Herein, an organic conjugated polyanthraquinoneimide (PAQI) with stacked layered porous nanosheet structures by a one-step solvothermal process. After polymerization, not only the solubility of PAQI in electrolytes was reduced, but also the utilization of the active site (C=O) was significantly increased to enhance the electronic conductivity. Moreover, PAQI also exhibited a high ion diffusion coefficient (0.946 × 10−10 ∼ 1.293 × 10−10 cm2 s−1) and showed excellent electrochemical performance as the anode for a metal-free dual-ion battery, with a discharge specific capacity of up to 128 mAh g−1 and a capacity retention rate of 80% after 200 cycles under a high rate of 2 C (1 C = 228 mA g−1). Meanwhile, cyclic voltammetry tests and reaction kinetic calculations revealed that PAQI was a pseudocapacitive storage mechanism combining diffusion control and surface capacitance processes (the capacitance contribution is 82.59 % at a scan rate of 0.9 mV s−1). These abundant stacked layered porous nanosheet structures provided a new route for research and development of the next-generation green metal-free dual-ion batteries.

Metal-organic framework-derived Nickel Diselenide grown in situ on carbon for high-performance Li storage

The creation of innovative anodes to replace graphite in lithium-ion batteries (LIBs) is necessary to meet the rising demand for energy storage devices. Based on the large Li storage capacity, transition metal selenides (TMSs) draw considerable interest for LIBs. However, volume expansion of TMSs during the cycling process hinders their large-scale commercial application for LIBs. Herein, the NiSe2 particle grown in situ on the porous carbon framework (NiSe2@C) is prepared by selenization of metal-organic frameworks (MOFs) in an argon atmosphere. NiSe2@C exhibits a high reversible Li storage capacity (770 mAh g−1 at 200 mA g−1after 100 cycles), long cycling life (308 mAh g−1 at 1 A g−1 after 1000 cycles), and good rate capability (214 mAh g−1 at 5.0 A g−1). The long cycling performance can be attributed to the fact that NiSe2@C can withstand volume expansion during the Li+ insertion and desertion process. Furthermore, cyclic voltammetry (CV) tests at various scan rates are conducted to investigate the kinetics of NiSe2@C for LIBs, indicating that the Li storage behaviour of NiSe2@C is primarily controlled by the capacitive process. The fabrication of the TMS@C composites by selenization of MOFs is a potential way to obtain anodes for high-performance Li storage.

Design, machining and characterization of the components required for the manufacture of a supercapacitor

One of the main European objectives is to promote the change of consumption towards renewable energies, which have shown a remarkable worldwide growth, the problem lies in the fact that the technologies used, which have been developed very rapidly during these years, do not have sufficiently advanced energy storage systems.The main objectives of this study have been the design and manufacture of supercapacitors that do not suffer corrosion processes and with higher performance.To this end, supercapacitor connectors have been designed and machined with different materials in order to find the one that best ensures the non-influence of corrosion processes and ensures correct parallelism. In addition, different carbonaceous materials have been tested for the manufacture and subsequent textural, chemical and morphological characterization of the different electrodes and, finally, charge/discharge and cyclic voltammetry tests have been carried out to analyze which parameters are key for the manufacture and improvement of the supercapacitors.The results showed that the proposed supercapacitor manufacturing methodology is highly recommended to avoid problems derived from poor assembly, reproducibility of results or problems due to the appearance of galvanic couples. Moreover, the electrodes tested showed very interesting results, as demonstrated by the voltammograms, the chronopotentiograms and the specific energy values, the latter showing that the capacitance exerts a notable influence on the energy values, with the PCO1000C/Graphite and PCO1000C/rGO samples showing the highest energy values.

Revealing the Electrochemical Kinetics of Electrolytes in Nanosized LiFePO4 Electrodes

Lithium-ion battery rate performance is ultimately limited by the electrolyte, yet the behaviors of electrolytes during high-rate (dis)charge remain elusive to electrochemical measurement. Herein, we develop and study a nanosized LiFePO4 model system in which the electrolyte completely controls the electrochemical kinetics of the porous electrode. Impedance spectroscopy, cyclic voltammetry, and rate performance testing prove that ion transport in the electrolyte is the sole rate-limiting process, even in thin electrodes. A novel pseudo-steady-state extrapolation (S3E) method for Tafel analysis shows that LiFePO4 obeys Butler-Volmer kinetics with a transfer coefficient of 3. The combination of these unexpectedly rapid interfacial kinetics and an activation barrier for phase transformation causes extreme reaction heterogeneity, which manifests as a moving reaction zone. Resistance versus capacity analysis enables direct measurement of electrolyte resistance growth during high-rate (dis)charge, revealing how the interaction between concentration polarization and a moving reaction zone controls electrolyte rate performance in LiFePO4 electrodes. This work elucidates the profound impacts of the electrolyte on electrochemical measurements in porous battery electrodes: when the active material is not rate limiting, it is impossible to directly measure the intrinsic kinetics of the active material, but conversely, it becomes possible to directly measure the kinetics of the electrolyte.

3D Nitrogen-Doped Porous Carbon Supported Pt Catalyst for Electrocatalytic Oxidation of Glucose

Glucose fuel cells have attracted widespread attention in the biomedical field due to their ability to generate electrical energy continuously. The development of this technology has great potential in the application of powering implantable medical devices. However, the efficiency of the glucose oxidation reaction at the anode of the fuel cell is low, and a catalyst needs to be added to improve the reaction efficiency. Platinum (Pt) catalysts are prone to agglomerate during use, which limits the improvement of their properties such as catalytic activity and stability. To address this problem, in this paper, a three-dimensional ( 3D) N-doped porous carbon (NCZIF-8) material with a large specific surface area was prepared as a catalyst carrier using ZIF-8 as a precursor. Low loading rate of platinum (10 wt. %) was prepared (10% Pt/NCZIF-8) and used as catalysts for glucose oxidation reaction. The materials were structurally characterized by XRD, SEM, TEM, Raman and FT-IR, etc. The electrocatalytic properties of the materials were characterized using an electrochemical workstation. It was shown that the incorporation of NCZIF-8 carrier promotes the dispersion of Pt nanoparticles (NPs) and the utilization of the catalyst, which enhances the catalytic activity and stability of catalysts during electrocatalytic glucose oxidation. After 300 times cyclic voltammetry (CV) tests, the peak current density of 10% Pt/NCZIF-8 only decreased by 21. 12% and 8. 59% in the double-layer region and oxygen region, respectively, indicating the excellent stability of the catalyst. This kind of catalyst with low loading rate of precious metal has great potential for its practical application by improving catalyst utilization, which not only improves the catalytic efficiency but also reduces the material cost.

Insight into the relationship between the photostability and molecular structure of rhodamine dyes

It is still challenging to clarify the intrinsic relationship between the photostability and molecular structures of rhodamine dyes. Herein, we investigated the photostability of three rhodamine dyes RhB, Rh101, and Rh101-ME in water and 20%EtOH–H2O solutions under 525 nm LED light irradiation. The photostability of RhB is much higher than that of Rh 101 and Rh101-ME, indicating that forming rigid ring between the N-linked alkyl and xanthene can significantly decrease the photostability of rhodamine dyes, while the esterification of carboxyl on benzene ring can improve their photostability. The EPR analyses and radical trapping experiments proved that 1O2 is the most important reactive oxygen species responsible for dye degradation, and the Rh101 and Rh101-ME have higher 1O2 and •OH production rates than RhB. The cyclic voltammetry tests showed that forming rigid ring between the N-linked alkyls and xanthene can decrease the oxidation potential of RhB and consequently lower down its photostability. The theoretical calculations disclosed that the higher HOMO energy levels in ground states and lower singlet–triplet energy gaps of Rh101 and Rh101-ME are the main factor that results in their lower photostability when compared with RhB.

Bubble-template assisted fast electrochemical deposition of 3-D ternary Ni-Cu-Co alloy as promising catalyst for electrochemical overall water splitting

Today, the synthesis of electrocatalysts with excellent and unique activity for hydrogen production is one of the most critical challenges. In this study, binder-free and active Ni-Cu-Co electrode was created by electrochemical preparation manner. Its electrocatalytic behavior was investigated for hydrogen evolution reaction (HER), and oxygen evolution reaction (OER). The electrocatalytic activity was investigated by linear sweep voltammetry (LSV), cyclic voltammetry (CV), Tafel and electrochemical impedance spectroscopy (EIS) tests. The results of the electrocatalytic behavior showed that the Ni-Cu-Co 3-D electrode fabricated at 3 A·cm−2 inspired by high active surface area, having superhydrophilic nature and synergistic effect between elements, has the best hydrogen production performance. The needed overpotential for 10 mA.cm−2 was only 68 mV and 245 mV in HER and OER, respectively. In addition, in the overall water splitting cell using this electrode as a cathode and anode, the 10 mA.cm−2 current density will attain in 1.55 V with outstanding stability. This study, introduces the new fast electrochemical method for synthesizing an active and stable bi-functional electrocatalyst.

The Effect of Rare-Earth Elements on the Morphological Aspect of Borate and Electrocatalytic Sensing of Biological Compounds.

Adjusting the morphological characteristics of a material can result in improved electrocatalytic capabilities of the material itself. An example of this is the introduction of rare-earth elements into the borate structure, which gives a new perspective on the possibilities of this type of material in the field of (bio)sensing. In this paper, we present the preparation of borates including La, Nd and Dy and their application for the modification of a glassy carbon electrode, which is used for the non-enzymatic detection of a biologically relevant molecule, vitamin B6 (pyridoxine). Compared with the others, dysprosium borate has the best electrocatalytic performance, showing the highest current and the lowest impedance, respectively, as determined using cyclic voltammetry and impedance tests. Quantitative testing of B6 was performed in DPV mode in a Britton-Robinson buffer solution with a pH of 6 and an oxidation potential of about +0.8 V. The calibration graph for the evaluation of B6 has a linear range from 1 to 100 μM, with a correlation coefficient of 0.9985 and a detection limit of 0.051 μM. The DyBO3-modified electrode can be used repeatedly, retaining more than 90% of the initial signal level after six cycles. The satisfactory selectivity offered a potential practical application of the chosen method for the monitoring of pyridoxine in artificially prepared biological fluids with acceptable recovery. In light of all the obtained results, this paper shows an important approach for the successful design of electrocatalysts with tuned architecture and opens new strategies for the development of materials for the needs of electrochemical (bio)sensing.

Organo‐Mediator Enabled Electrochemical Deuteration of Styrenes

AbstractDespite widespread use of the deuterium isotope effect, selective deuterium labeling of chemical molecules remains a major challenge. Herein, a facile and general electrochemically driven, organic mediator enabled deuteration of styrenes with deuterium oxide (D2O) as the economical deuterium source was reported. Importantly, this transformation could be suitable for various electron rich styrenes mediated by triphenylphosphine (TPP). The reaction proceeded under mild conditions without transition‐metal catalysts, affording the desired products in good yields with excellent D‐incorporation (D‐inc, up to >99 %). Mechanistic investigations by means of isotope labeling experiments and cyclic voltammetry tests provided sufficient support for this transformation. Notably, this method proved to be a powerful tool for late‐stage deuteration of biorelevant compounds.

Organo-Mediator Enabled Electrochemical Deuteration of Styrenes.

Despite widespread use of the deuterium isotope effect, selective deuterium labeling of chemical molecules remains a major challenge. Herein, a facile and general electrochemically driven, organic mediator enabled deuteration of styrenes with deuterium oxide (D2O) as the economical deuterium source was reported. Importantly, this transformation could be suitable for various electron rich styrenes mediated by triphenylphosphine (TPP). The reaction proceeded under mild conditions without transition-metal catalysts, affording the desired products in good yields with excellent D-incorporation (D-inc, up to > 99%). Mechanistic investigations by means of isotope labeling experiment and cyclic voltammetry tests provided sufficient support for this transformation. Notably, this method proved to be a powerful tool for late-stage deuteration of biorelevant compounds.

Optimizing energy storage performance of ALD YSZ thin film devices via yttrium concentration variations

In the last decade, research has focused on fabricating new materials to accelerate the development of energy storage devices. In this work, metal-electrolyte-metal (Au-YSZ-Ru) structures were fabricated on silicon substrates using atomic layer deposition, sputtering, and thermal evaporation techniques. The effect of the yttrium concentration in YSZ films on their chemical, structural, optical, and electrical properties were studied. XPS analysis showed yttrium concentrations of 14.6, 10.3, 6.8, and 5.3 at.% for films with ALD cycle ratios Zr:Y of 2:1, 4:1, 6:1, and 8:1. Deconvolution of the oxygen XPS signal demonstrate the yttrium to oxygen vacancies ratio. The band gap was calculated through UV–vis indicating an increase in values with yttrium concentration. In addition, the trend was confirmed by reflection electron energy loss spectroscopy (REELS). The structure was investigated by performing X-ray diffraction (XRD) and infrared attenuated total reflectance spectroscopy (IR-ATR) measurements. Both results indicate a better crystallization of the cubic phase for the samples with lower concentrations, as the intensity of (111) diffraction peaks and IR band increased for lower yttrium concentrations. Impedance spectroscopy revealed an activation energy of 1.69, 1.32, and 1.28 eV for the 10.3, 6.8, and 5.3 at.% film concentration, respectively. According to cyclic voltammetry and charge-discharge tests, a lower yttrium concentration, 5.3 at.%, promotes electrode REDOX reactions improving the energy-storage properties.

Magnesium‐Ion Battery Anode from Polymer‐Derived SiOC Nanobeads

AbstractTin‐containing silicon oxycarbide (SiOC/Sn) nanobeads are synthesized with different carbon/tin content and tested as electrodes for magnesium‐ion batteries. The synthesized ceramics are characterized by thermogravimetric‐mass spectroscopy, Fourier‐transform infrared spectroscopy, X‐ray diffraction (XRD), Raman spectroscopy, N2 sorption analysis, scanning electron microscope, energy‐dispersive X‐ray, and elemental analysis. Galvanostatic cycling tests, rate performance tests, electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) tests, and ex situ XRD measurements are conducted. Results of battery performance tests present a high capacity of 198.2 mAh g−1 after the first discharging and a reversible capacity of 144.5 mAh g−1 after 100 cycles at 500 mA g−1. Excellent rate performance efficiency of 85.2% is achieved. Battery performances in this research are influenced by surface area, and tin contentof the SiOC/Sn nanobeads. EIS, CV tests, and ex situ XRD measurements reveal that higher surface area contributes to higher capacity by providing more accessible Mg2+ ion storage sites and higher rate capability by improving the diffusion process. Higher Sn content increases battery capacity through reversible Mg‐Mg2Sn‐Mg alloying/dealloying process and improves the rate performances by increasing electrical conductivity. Besides, SiOC advances cycling stability by preventing electrode collapse and enhances the capacity due to higher surface capacitive effects.

Amperometric flow injection analysis of hydroquinone in dermatological creams using a porous diamond-like carbon electrode

A porous diamond-like carbon film deposited on vertically aligned multi-walled carbon nanotubes (DLC:VAMWCNT) was evaluated as an electrode material in flow injection analysis (FIA) with amperometric detection. The redox behavior of hydroquinone (H2Q) was carried out as proof of concept. From cyclic voltammetry tests, H2Q gave a heterogeneous electron transfer rate constant (k0) of 4.9 × 10−3 cm s−1, which is comparable or better than those obtained with conventional electrodes. For the H2Q determination with the FIA-amperometry system, optimizations were performed regarding the supporting electrolyte, applied potential and FIA parameters (flow rate and sample injection volume). Under optimal conditions, the amperometric response of the DLC:VAMWCNT electrode was linear in the H2Q concentration range from 1.0 × 10−6 to 1.0 × 10−4 mol L−1, with a limit of detection (LOD) of 7.7 × 10−7 mol L−1. Interestingly, the DLC:VAMWCNT electrode displayed a very stable response under hydrodynamic conditions, with no memory effect while retaining accuracy towards the analysis of commercial H2Q-based dermatological creams. From these findings, DLC:VAMWCNT appears to be an outstanding candidate for flow injection analysis systems coupled to electrochemical detection.

Superior Compatibility of Hard-Carbon Anodes for Sodium-Ion Batteries in Ionic Liquid Electrolytes.

Hard carbons (HC) from natural bio-waste have been investigated as anodes for sodium-ion batteries in electrolytes based on the 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide (EMIFSI) and N-trimethyl-N-butylammonium bis(fluorosulfonyl)imide (N1114FSI) ionic liquids. The Na+ intercalation process has been analyzed by cyclic voltammetry tests, performed at different scan rates for hundreds of cycles, in combination with impedance spectroscopy measurements to decouple bulk and interfacial resistances of the cells. The Na+ diffusion coefficient in the HC host has been also evaluated via the Randles-Sevcik equation. Battery performance of HC anodes in the ionic liquid electrolytes has been evaluated in galvanostatic charge/discharge cycles at room temperature. The evolution of the SEI (Solid Electrochemical Interface) layer grown on the HC surface has been carried out by Raman spectroscopy. Overall the sodiation process of the HC host is highly reversible and reproducible. In particular, a capacity retention exceeding 98 % of the initial value has been recorded in N1114FSI electrolytes after more than 1500 cycles with a coulombic efficiency above 99 %, largely beyond standard carbonate-based electrolytes. Raman, transport properties and impedance confirms that ILs disclose the formation of SEI layers with superior ability to support the reversible Na+ intercalation with the possible minor contributions from the EMI+ cation.

In-situ concentration measurement of soluble-soluble redox couple in molten chlorides utilizing intense natural convection effect

Herein we reported the in-situ electrochemical concentration measurement of soluble-soluble redox species (Eu3+/Eu2+ and Sm3+/Sm2+) in molten LiCl-KCl, based on the notable natural convection in molten salts. The combined simulation and experiments confirmed the presence of strong natural convection, which resulted in steady-state current in cyclic voltammetry tests at low scan rates. Interestingly, this natural convection effects offered a novel and simple way to calculate the diffusion coefficient and concentration ratio of soluble redox species.

Achieved advanced wastewater phosphate removal via improved ionic interference resistance in a migration-electric-field assisted electrocoagulation (MEAEC) system with modified-biochar pseudocapacitor electrode

The capacitive deionization-assisted electrocoagulation system has promising application potential in advanced phosphate removal of its low electricity consumption and sacrificial anode material. Phosphate removal in wastewater is crucial since excess phosphate might lead to eutrophication. However, the complex ion composition in raw wastewater can influence the effective phosphate removal by competing with the precipitable metal ions during electrocoagulation. In this study, a novel migration electric-field assisted electrocoagulation (MEAEC) with an assisted capacitive electrode made of N-doped and Fe-La co-modified biochar (LFNB) to achieve specific phosphate electro-adsorption for effective advanced phosphate removal. The LFNB-MEAEC achieved ultrahigh phosphate removal with the effluent of 0.1 mg/L in synthetic and raw municipal wastewater and met the first Grade A standard of total phosphate in the discharge standard of pollutants for municipal wastewater treatment plant (DSPMWTP) in China. The commonly observed coexisting ions in wastewater and a pH range of 2–12 did not significantly fluctuate the phosphate removal of LFNB-MEAEC. Cyclic voltammetry and charging-discharging tests confirmed the high phosphate affinity and excellent durability of LFNB in ion-interference circumstances. The MEAEC assisted with selective-adsorption capacitive electrodes and provided an effective and practical method for advanced phosphate removal from low-phosphorus-contaminated wastewater. The MEAEC with a selective-adsorbed capacitive electrode improved phosphate removal by 21 % (from 74 ± 1.7% to 95 ± 1.0%), reduced the energy consumption by 65.7% (0.012 kWh m−3-wastewater), and saved the sacrificial anode material by 67.5% (from 200 to 65 g m−3-wastewater) than those of MEAEC without phosphate-selective electrode in the same period (Sacrificial anode working time 200 s).

Study the corrosion issues on galvanized steel induced in water tanks

AbstractWeight loss, potentiodynamic polarization, and cyclic voltammetry tests were employed to assess the effects of sodium hypochlorite concentration and pH on the corrosion characteristics of galvanized steel in water tanks. Pitting corrosion appeared on the galvanized steel concurrently in neutral drinkable water. Passivation developed after exposure to 70 mg/L sodium hypochlorite solutions. The results demonstrated that adding NaClO to wastewater solutions reduced the corrosion rate. The corrosion rate of wastewater is 568.7 m/y, which can be reduced by adding NaClO to a lower value of 22.94 m/y at 70 mg/L. NaClO has the maximum efficiency at 70 mg/L, with a value of 95.96%. It was discovered that the galvanized steel in potable water was sensitive to passivation dissolution when hypochlorite solutions with concentrations ranging from 30 to 70 mg/L were added. However, hypochlorite solutions with concentrations greater than 150 mg/L cause significant corrosion on galvanized steel. The PDP and cyclic voltammetry findings revealed that the galvanized steel had good passivation properties under high 70 mg/L sodium hypochlorite concentrations. Only the sodium hypochlorite decreased the amounts of all sessile microorganism families. The scanning electron microscope was employed to check the corroded samples' morphology. Pitting corrosion was discovered alongside galvanic corrosion and uniform corrosion.Kindly check and confirm whether the corresponding author mail ID is correctly identified.Confirmed

Morphology induced symmetrical supercapacitive performance of the 3D interconnected Ni(OH)2 framework

The rational design of electrode materials for energy storage applications is a key element of resolving the energy crisis. Herein, nickel hydroxide (NHO) nanostructures with different morphologies, such as platelet (Platelets-NHO), three-dimensional flower (3DF-NHO), and flake-like (Flakes-NHO) morphologies, were synthesized using different solvents inside the hydrothermal reactor during the reaction process. The fabricated electrode materials of the NHO nanostructure were further characterized using different types of microscopic and spectroscopic techniques, and their electrochemical performance was further studied in a three-electrode assembly cell to explore the morphological effect on the supercapacitive performance. The 3DF-NHO displayed a significantly enhanced capacitance value (1112.5 F g−1) than Platelets-NHO (820.0 F g−1) and Flakes-NHO (850.0 F g−1) at the same current load (1 A g−1). The electrochemical supercapacitive performance of 3DF-NHO, Platelet-NHO, and Flakes-NHO revealed that the morphology played an important role in enhancing the electrode chemical performance of the electrode material. The symmetric assembly cell of 3DF-NHO was also assembled, and cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and cyclic stability tests were recorded, revealing excellent performance for potential applications in the field of energy storage devices. Among the materials, the excellent performance of 3DF-NHO is credited to the three-dimensional structures and interconnected petals, which provide a better surface and suitable space for the electrolytes during the electrochemical reaction. These results suggest that the rational design of the electrode material using an appropriate solvent could help to fabricate a large number of different morphologies of NHO, which may be a potential candidate for energy storage electrode materials.

Preparation and Characterization of Chitosan/Reduced Graphene Oxide Film as a Sensing Material

Sensing materials are crucial in a wide range of fields, including environmental monitoring, healthcare, security, and industrial applications. By leveraging their specific properties, sensing materials enable the development of innovative sensing devices and systems for improved detection, monitoring, and control of various parameters in our environment. This study aimed to prepare the chitosan/reduced graphene oxide film as sensing materials using a simple casting method. The reduced graphene oxide (rGO) was mixed with chitosan (CS), consisting of a concentration ratio of 200, 250, 300, 350, and 400 ppm. Three characterizations were used to describe the formed CS/rGO films, namely, Fourier transform infrared (FTIR), X-ray diffraction (XRD), and cyclic voltammetry (CV). FTIR and XRD analysis results were successfully performed, which showed that the process of loading of rGO and the film fabrication occurred in the physical interaction. The CV test also showed that the CS/rGO modified electrode has high sensitivity in PBH pH 7 and can be applied as a sensing material.

A novel sensor based on Ti3C2 MXene/Co3O4/carbon nanofibers composite for the sensitive detection of 4-aminophenol

A novel, sensitive Ti3C2 MXene/Co3O4/carbon nanofibers (Ti3C2 MXene/Co3O4/CNFs) composite was synthesized via a HF exfoliating Ti3AlC2 strategy, followed by doping Co3O4 and Ti3C2 MXene into the CNFs via a combination electrospinning and thermal annealing process. Ti3C2 MXene/Co3O4/CNFs composite exhibits higher catalytic effect, conductivity, chemical stability, and electrochemical performance than Co3O4 and Ti3C2 MXene in electrochemical impedance, differential pulse stripping voltammetry, chronocoulometry, and cyclic voltammetry tests. This Ti3C2 MXene/Co3O4/CNFs hybrid modified electrode provides fast analysis of 4-aminophenol (4-AP) with ultrahigh sensitivity, enhanced reproducibility and strong anti-interference capability. Furthermore, the level of 4-AP was quantified by this electrode with a wide linear range from 0.5 to 150 μM (R2 > 0.99) and a low detection limit about 0.018 μM was achieved. Finally, the fabricated electrode was used for fast and sensitive analysis of 4-AP spiked in tap water and blood serum samples. This work presents the new Ti3C2 MXene/Co3O4/CNFs electrode provides a platform for 4-AP monitoring and has the advantages of high selectivity, accuracy, simplicity, and rapid analysis.