Two-step Synthesis Route Research Articles

Electrical properties and temperature stability of high TC/TR-T Pb(In1/2Nb1/2)O3–Pb(Zn1/3Nb2/3)O3–PbTiO3 piezoelectric ceramics with compositions near the morphotropic phase boundary

Three sets of ternary ceramics in the compositions of 0.35Pb(In1/2Nb1/2)O3–(0.65−y)Pb(Zn1/3Nb2/3)O3–yPbTiO3 (y = 0.22–0.29), 0.40Pb(In1/2Nb1/2)O3–(0.60–y)Pb(Zn1/3Nb2/3)O3–yPbTiO3 (y = 0.24–0.32), and 0.50Pb(In1/2Nb1/2)O3–(0.50–y)Pb(Zn1/3Nb2/3)O3–yPbTiO3 (y = 0.27–0.37) near the morphotropic phase boundary (MPB) were fabricated by a two-step solid-phase synthesis route. The structure, electrical properties, and temperature stability of piezoelectric ceramics were studied. Structural analysis revealed that all ceramics exhibited pure perovskite phase and dense microstructure. In our chosen compositions, the maximum piezoelectric coefficient d33 = 589 pC/N and electromechanical coupling factor kp = 0.59 are presented for 0.35PIN–0.40PZN–0.25PT, the highest rhombohedral to tetragonal phase transformation temperature TR-T on the order of 187 °C is observed in the 0.50PIN–0.23PZN–0.27PT composition with a Curie temperature TC = 269 °C, 0.40PIN–0.33PZN–0.27PT, and 0.40PIN–0.32PZN–0.28PT ceramics do not depolarize at temperatures up to 230 °C. Considering the relatively high TC (255 °C), d33 (523 pC/N) and good thermal stability, 0.40PIN–0.33PZN–0.27PT is very promising for high-temperature piezoelectric applications. On this basis, a property-composition diagram around MPB in PIN–PZN–PT system was also established.

Graphene Foam (GF)/Manganese Oxide (MnO2) Nanocomposites for High Performance Supercapacitors

Abstract We report supercapacitive characteristics of hierarchically porous architectured graphene foam (GF)/manganese oxide (MnO2) nanocomposites fabricated via a simple two-step synthesis route. A polyurethane (PU) foam with graphene flakes adsorbed onto the pore walls is pyrolyzed to obtain GF. The MnO2 is then electrochemically deposited onto GF to form a GF/MnO2 (with a conductivity of 2.85 and 1.1 Sm−1, respectively) nanocomposite. The GF is an ideal scaffold template for electrochemical deposition of MnO2 and fast ion transport from MnO2 to GF. The GF/MnO2 supercapacitor shows excellent specific capacitance (672 F g−1), rate capability (85% capacity retention over 1 to 20 A g−1), and long cycle life (2% capacity loss after 10000 charge/discharge cycles) for 0.5 mg cm−2 MnO2 loading. Furthermore, the optimized supercapacitor delivers a specific energy of 95 Wh kg−1 at a specific power of 1 kW kg−1, which is substantially higher than that of most of the reported GF based supercapacitors. The results obtained here may pave the way for the development of commercial supercapacitors for future energy storage systems.

Valorization of Palm Biomass Waste for Sustainable Production of Lipase-Carbon Matrices And Biodiesel

The conversion of arable land to produce plant-based biofuels can produce more greenhouse gas (GHG) emissions than the displacing effect that is expected from the use of biofuels instead of fossil fuels. Utilizing agricultural waste offers an alternative pathway to reducing GHG emissions. Typical palm oil mills, for instance, produce palm kernel shells (PKS) and palm oil mill effluents (POME) as wastes in enormous amounts which accounts for > 60% of solid and liquid waste from the mill. Here, we explore the feasibility of a circular palm bioeconomy where waste PKS was directly converted to activated carbons (AC) in a technique (550 °C, under N 2 ) that departs from the conventional two-step (carbonization and activation) AC synthesis route. Using FT-IR, FE-SEM, and EDX as surface analysis tools, the synthesized carbons, PKAC, showed excellent morphological and surface functionalities similar to bituminous coal-derived activated carbons. The 1 – 10 μm pore diameters of PKAC were relevant in the immobilization of Aspergillus oryzae whole-cells expressing recombinant Fusarium heterosporum lipase. For biodiesel synthesis, the higher specific activity of the PKAC-immobilized whole-cell lipase (81.6 IU/mg BSP) ensured the conversion of POME to ≥97.5 wt. % fatty acid methyl ester (FAME). Whilst offering the benefits of cheap immobilization carriers and greener synthesis routes, the produced FAME showed properties (48.8 cetane number) that conform to ASTM and EN specifications. This study thus serves as a framework for the design of hydrocarbon synthesis platforms for a future palm bioeconomy.

Achieving effective control of the photocatalytic performance for CoFe2O4/MoS2 heterojunction via exerting external magnetic fields

Magnetic CoFe2O4/MoS2 heterojunction catalysts are prepared through a two-step synthesis route combing an electrospinning technique and a hydrothermal process. The as-synthesized CoFe2O4/MoS2 are magnetized by different magnetic fields so as to explore the impact of magnetic fields on its photocatalytic performance. The photocatalytic degradation efficiency for Congo red (CR) of the magnetized CoFe2O4/MoS2 catalysts is analyzed deeply, where the effective tune of photocatalytic ability for the CR degradation through exerting external magnetic fields is confirmed. Interestingly, with increasing the magnetic fields, the photocatalytic degradation efficiency for CR exhibits first decreases, and then increases, lastly decreases again. When the external magnetic field is up to 1500Oe, the photocatalytic degradation efficiency reaches 96.6%. The study provides a new thought to tune the photocatalytic properties and improve photocatalytic degradation efficiency of magnetic catalysts.

Hydrocolloids: Nova materials assisting encapsulation of volatile phase change materials for cryogenic energy transport and storage

A series of norm-defying hydrocolloid emulsifiers is reported for the challenging task of outstanding long-term retention of volatile cryogenic phase change materials (cryoPCM) in high-payload capsules. Their identification lifted previously imposed restrictions on emulsifier selection in order to fine-tune the mechanical and barrier properties, shell thickness, size and surface roughness of capsules. The exceptionally large payload in terms of both volume (~97 vol%) and weight (~95 wt%), superb long-term retention capability tested at ambient conditions up to 30 days, as well as the surprising cryo-temperature survival of synthesized capsules promote them as immensely efficient candidate carriers for cryogenic thermal energy storage and transport. Utilization of appropriate hydrocolloids and concentrations not only bestows the thermosetting polymeric shells with flexibility, but also eliminates the majority of imbedding satellite particles producing exterior surfaces comparable to a two-step synthesis route ever reported. Promising fatigue resistance within an extreme dynamic temperature range between 20 °C and −140 °C during preliminary cycling tests has been demonstrated via direct observation of capsule buckling and restoration. Such findings provide fundamental insights into achieving superior capsule quality and their far-reaching impacts beyond cryogenic energy storage on applications such as less harsh cold chain logistics, electrophoresis displays, battery safety management and self-healing materials.

Controllable Synthesis of Zn-Doped α-Fe2O3 Nanowires for H2S Sensing.

One-dimensional Zn-doped α-Fe2O3 nanowires have been controllably synthesized by using the pure pyrite as the source of Fe element through a two-step synthesis route, including the preparation of Fe source solution by a leaching process and the thermal conversion of the precursor solution into α-Fe2O3 nanowires by the hydrothermal and calcination process. The microstructure, morphology, and surface composition of the obtained products were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. It was found that the formation process of α-Fe2O3 is significantly influenced by the introduction of Zn2+. The gas sensing measurements indicated that the sensor based on 1% Zn-doped α-Fe2O3 nanowires showed excellent H2S sensing properties at the optimum operating temperature of 175 °C. Notably, the sensor showed a low H2S detection limit of 50 ppb with a sensor response of 1.5. Such high-performance sensing would be ascribed to the one-dimensional structure and high specific surface area of the prepared 1% Zn-doped α-Fe2O3 nanowires, which can not only provide a large number of surface active sites for the adsorption and reaction of the oxygen and H2S molecules, but also facilitate the diffusion of the gas molecules towards the entire sensing materials.

Electrochemical performance of two-dimensional Ti3C2-Mn3O4 nanocomposites and carbonized iron cations for hybrid supercapacitor electrodes

In this work, we present a simple two-step synthesis route to develop a cost effective high performance Ti3C2Mn3O4 nanocomposite via a solvothermal process at 150 °C. The characterization of the composite material was obtained via various techniques. Electrochemical performance study of the material as a potential supercapacitor electrode demonstrated a maximum specific capacity of 128 mAh g−1 at a specific current of 1 A g−1 in a 6 M KOH aqueous electrolyte. A capacity retention of 77.7% of the initial value was recorded after over 2000 galvanostatic cycles at 10 A g−1 for the single electrode. More so, the as-prepared nanocomposite sample electrode also showed a relatively stable property with an energy efficiency of 83.5% after cycling tests. Interestingly, an assembled hybrid supercapacitor device with carbonized iron cations (C-FP) and the Ti3C2Mn3O4 composite delivered a specific capacity of 78.9 mAh g−1. The device yielded a high energy of 28.3 Wh kg−1 with an equivalent 463.4 W kg−1 power densityat 1 A g−1. A good cycling stability performance with an energy efficiency of 90.2% in addition to a 92.6% capacity retention was observed for over 10,000 cycles at specific current of 3 A g−1 over a voltage window of 1.5 V.

A Floatable Piezo-Photocatalytic Platform Based on Semi-Embedded ZnO Nanowire Array for High-Performance Water Decontamination

HighlightsZnO nanowires were securely immobilized onto a floatable photocatalytic platform, which had a uniform diameter (55 ± 5 nm) and length (1.5 ± 0.3 μm).An additional 20% of the probe pollutant (methylene blue) was degraded by piezocatalysis-assisted photocatalytic degradation.The crude oil pollutant was decomposed up to 20% within 6 h.Photocatalytic degradation attracts considerable attention because it is a promising strategy to treat pollutants from industrial and agricultural wastes. In recent years, other than the development of efficient photocatalysts, much effort has been devoted to the design of reliable and inexpensive photocatalytic platforms that work in various environment conditions. Here, we describe a novel photocatalytic platform that is able to float and freely move atop water while performing photodegradation. Compared to common platforms, such as slurry reactors and immobilized photoreactors, the proposed platform is advantageous in terms of easy recycling and energy saving. Furthermore, the special configuration resulting from a two-step synthesis route, semi-embedded photocatalysts, addresses some of the remaining challenges, for instance, the contamination from the loose photocatalysts themselves. For the probe pollutant, methylene blue (MB), a reproducible and remarkable degradation activity of the platform, is observed and the effect of two primary factors, including surface area of the catalyst and mass transfer rate, is investigated. Besides, the piezo-photocatalysis effect, serving as an additional functionality, is confirmed to further improve the degradability of the platform, which offers an additional 20% of degraded MB. At last, the promising result of the degradation toward crude oil reveals the possibility of the platform to be used in gasoline pollution treatment.

Enhanced visible-light photocatalytic activity of one dimensional In2O3/In2TiO5 nanobelts

In this study, a two-step synthesis route combining an electrospinning with a precipitation process was used to prepare one dimensional In2O3/In2TiO5 nanobelts. The obtained In2O3/In2TiO5 nanobelts were characterized with XRD, SEM, EDS, UV–vis DRS and N2 adsorption-desorption isotherms. Effects of the mole ratios of In2O3 to In2TiO5 on the photocatalytic activity of photocatalyst were investigated using rhodamine B (RhB) as a model pollutant. Results showed that In2O3/In2TiO5 nanobelts with the mole ratio of 1–10 exhibited the highest photocatalytic activity under xenon lamp (150 W) irradiation. The degradation rate of RhB reached 97.1% in 120 min, and the photocatalytic degradation followed the first order kinetic model. Furthermore, the skeleton of levofloxacin (LEV) was completely destroyed after irradiation for 60 min. The recycling tests confirmed that the photocatalytic activity was still above 85% after 5 cycles. This proved that In2O3/In2TiO5 not only had an excellent visible-light-driven photocatalytic activity, but also could be used in organic dye removal and antibiotics wastewater treatment.

In situ prepared poly(DL-lactic acid)/silica nanocomposites: Study of molecular composition, thermal stability, glass transition and molecular dynamics

The objective of the present study was to prepare a series of poly(DL-lactic acid) (PDLLA) nanocomposites with four different amounts of silica (SiO2) nanoparticles (2.5, 5, 10 and 20 wt%), following a new two-step synthesis route: ring opening polymerization of DL-lactide and polycondensation. Effects of different percentage of SiO2 on various properties such as molecular weight, crystallinity, thermal stability, glass transition temperature (Tg) and molecular dynamics, are discussed and compared with the theoretical models available in literature. Thermal stability of PDLLA was substantially enhanced from the addition of SiO2, while calorimetry and dielectric spectroscopy showed increased Tg in the nanocomposites, as well as indications for formation of interfacial rigid amorphous polymer fraction.

Z-scheme reduced graphene oxide/TiO2-Bronze/W18O49 ternary heterostructure towards efficient full solar-spectrum photocatalysis

Z-scheme reduced graphene oxide (rGO)/TiO2-bronze (TiO2-B)/W18O49 photocatalyst consisted of rGO, super-thin TiO2-B nanosheets, and W18O49 nanofibers was fabricated by a two-step solvothermal synthesis route. The TiO2-B nanosheets were tightly attached on rGO firstly. W18O49 nanowires were then grown on rGO/TiO2-B. Precursors and reaction conditions play important roles for getting the optimal microstructure. The ternary photocatalyst is able to absorb sunlight ranging from ultraviolet to near infrared regions, which makes full use of light for efficiently photocatalytic degrading organic pollutants. The light absorption intensity and photon-generated carrier transfer efficiency are both improved with adding rGO. The localized surface plasmon resonance effect arose from the nonstoichiometric W18O49 is in favour of the absorption range of the rGO/TiO2-B/W18O49 composite broadening to near infrared light range. The photocatalytic mechanism of Z-scheme rGO/TiO2-B/W18O49 composite was verified by an electron spin resonance test. The conduction band of TiO2-B and the valence band of W18O49 are used in the photocatalytic degradation of rhodamine B, facilitating the efficient separation of photogenerated carriers. The rGO/TiO2-B/W18O49 heterostructure exhibits an excellent photocatalytic performance under full solar-spectrum irradiation. The result may represent a new strategy for the construction of nanocomposites with suitable band structure in the efficient application of full solar light.

Facile preparation of superhydrophobic silica nanoparticles by hydrothermal-assisted sol–gel process and effects of hydrothermal time on surface modification

Superhydrophobic silica nanoparticles were prepared by hydrothermal-assisted sol–gel process using a two-step synthesis route. Silica nanoparticles were obtained by hydrolysis and condensation of tetraethyl orthosilicate (TEOS). Hexadecyltrimethoxysilane (HDTMS) was added to allow the condensation reaction between HDTMS hydroxyl group and silica hydroxyl group, rendering silica particles hydrophobic. Silica nanoparticles had a HDTMS/TEOS molar ratio of 2:40 and exhibited good hydrophobic property with a high water contact angle of 156.1°. Water droplet rolled off the surface of silica powder owing to a low sliding angle of 3.6°. When hydrothermal time of TEOS decreased from 120 to 60 min, all silica powders gave rise to high water contact angles (≥154.8°) and low sliding angles (≤5.5°). However, silica powder became hydrophilic when HDTMS and TEOS were added to the precursor together. This facile preparation of superhydrophobic silica nanoparticles with short reaction time provided the advantages for potential application in industrial production.

White LED based on CsPbBr3 nanocrystal phosphors via a facile two-step solution synthesis route

All-inorganic CsPbBr3 perovskite nanocrystals with mean size of ∼300 nm were synthesized via a facile two-step solution synthesis route. High-resolution transmission electron microscopy and X-ray diffraction characterizations confirm the as-prepared CsPbBr3 nanoparticles are single-crystals with good crystallinity, although a CsPb2Br5 impure phase also exists in the final product. Power-/temperature-dependent and time-resolved photoluminescence measurements reveal the notable and stable excitonic emission feature of these CsPbBr3 nanocrystals. As a proof-of-concept demonstration, a LED with p-GaN/n-ZnO heterojunction as blue-violet excitation chip and CsPbBr3 nanocrystals as green phosphors, was fabricated and a white electroluminescence was achieved from this perovskite nanocrystals decorated LED.

Molybdenum diselenide nanosheet/carbon nanofiber heterojunctions: Controllable fabrication and enhanced photocatalytic properties with a broad-spectrum response from visible to infrared light

Molybdenum diselenide nanosheet/carbon nanofiber (MoSe2/CNF) heterojunctions have been successfully obtained by a facile two-step synthesis route combining an electrospinning technique and solvothermal method. The results show that MoSe2 nanosheets distributed evenly on the carbon nanofibers without aggregation, and the loading amount of MoSe2 could be well controlled by adjusting the reactant concentrations during the solvothermal process for the fabrication of the MoSe2/CNF heterojunctions. The as-prepared MoSe2/CNF heterojunctions exhibited higher photocatalytic activity than pure MoSe2 for the degradation of Rhodamine B (RhB) under visible and infrared light irradiation. The normalized rate constant for the MoSe2/CNF heterojunctions was nearly 3.2 times and 1.6 times higher than that of pure MoSe2 under visible light and infrared light (1.5 W, 980 nm laser) irradiation, respectively. The enhanced photocatalytic activity might be attributed to the formation of heterojunctions, which could improve the separation of photogenerated electrons and holes at the MoSe2/CNF heterojunctions interface. In addition, MoSe2/CNF heterojunctions could be efficiently separated from the solution by sedimentation due to their ultralong one-dimensional and self-supporting structure. Such MoSe2/CNF heterojunctions with a broad-spectrum-response photocatalytic performance might have potential applications in water treatment.

Facile Hydrothermal-Ion-Exchange Synthesis and Enhanced Visible Light Photocatalytic Activity of Bi4Ti3O12/Bi2S3 Heterostructure

Bi4Ti3O[Formula: see text]/Bi2S3 heterostructures with enhanced visible light photocatalytic activity are successfully synthesized via a two-step synthesis route based on a sol–gel hydrothermal method and a subsequent hydrothermal-ion exchange reaction technique. The structures, composition, morphologies and light absorption capability of Bi4Ti3O[Formula: see text]/Bi2S3 heterostructures are verified by XRD, XPS, SEM, TEM and UV-Vis diffuse reflectance spectra, respectively. Results indicated that Bi2S3 nanorods are grown on the surface of the spherical structure assembled by criss-cross nanosheets of Bi4Ti3O[Formula: see text] after ion exchange reaction. The photocatalytic tests reveal that the Bi4Ti3O[Formula: see text]/Bi2S3 heterostructures showed much higher photocatalytic activity than pure Bi4Ti3O[Formula: see text] or Bi2S3. The tight interconnection between the two semiconductors will facilitate the photoinduced carriers’ separation. Owing to the easy preparation and excellent property, the obtained Bi4Ti3O[Formula: see text]/Bi2S3 heterostructures may be promising photocatalysts for practical application.

Controllable synthesis of (NH4)Fe2(PO4)2(OH)·2H2O using two-step route: Ultrasonic-intensified impinging stream pre-treatment followed by hydrothermal treatment

(NH4)Fe2(PO4)2(OH)·2H2O samples with different morphology are successfully synthesized via two-step synthesis route – ultrasonic-intensified impinging stream pre-treatment followed by hydrothermal treatment (UIHT) method. The effects of the adoption of ultrasonic-intensified impinging stream pre-treatment, reagent concentration (C), pH value of solution and hydrothermal reaction time (T) on the physical and chemical properties of the synthesised (NH4)Fe2(PO4)2(OH)·2H2O composites and FePO4 particles were systematically investigated. Nano-seeds were firstly synthesized using the ultrasonic-intensified T-mixer and these nano-seeds were then transferred into a hydrothermal reactor, heated at 170 °C for 4 h. The obtained samples were characterized by utilising XRD, BET, TG-DTA, SEM, TEM, Mastersizer 3000 and FTIR, respectively. The experimental results have indicated that the particle size and morphology of the obtained samples are remarkably affected by the use of ultrasonic-intensified impinging stream pre-treatment, hydrothermal reaction time, reagent concentration, and pH value of solution. When such (NH4)Fe2(PO4)2(OH)·2H2O precursor samples were transformed to FePO4 products after sintering at 650 °C for 10 h, the SEM images have clearly shown that both the precursor and the final product still retain their monodispersed spherical microstructures with similar particle size of about 3 μm when the samples are synthesised at the optimised condition.

Magnetic nanoparticle incorporated oleogel as iontophoretic drug delivery system

In this article, we validated the use of electric current as an external stimulus to induce an enhancement of drug release from magnetic nanoparticle (MNP) incorporated organogels (magnetogel) under iontophoretic conditions. For this purpose, we adopted a simple, two-step synthesis route to incorporate magnetic (Fe3O4) nanoparticles (MNP) and ciprofloxacin hydrochloride within the network of a soybean oil-based oleogel using stearic acid as gelator. We fabricated a series of MNP incorporated oleogels by varying the wt% of MNPs while keeping a constant weight ratio of soybean oil:stearic acid. The microstructures of the magnetogels were analyzed in MNP concentration-dependent manner by optical microscopy, powder X-ray diffraction, FTIR, mechanical, and electrical studies. Detailed analysis of the electrical properties revealed that the gel sample with a maximum proportion of MNP (S4) allowed the maximum passage of current through it among all the compositions. Under the iontophoretic environment of the active condition, we observed nearly 2.5 fold increase in cumulative drug release in case of sample S4 compared to the corresponding passive condition. These observations suggested that in future, our magnetogel formulation can be further developed as AC field induced ‘remote controlled’ agent for therapeutic application.

Electrospinning and hydrothermal synthesis of recyclable MoS2/CNFs hybrid with enhanced visible-light photocatalytic performance

In this work, a two-step synthesis route combining an electrospinning method and a hydrothermal process was used to prepare MoS2/CNFs hybrid. CNFs was applied as the matrix for the nucleation and growth of MoS2 nanosheets. In this hybrid, the crisscrossed MoS2 nanosheets were randomly aligned and densely packed over the surface of CNFs. We probed the photocatalytic activity of MoS2/CNFs hybrid to degrade rhodamine B (Rh B) in an aqueous solution under visible light irradiation. The hybrid displayed higher photodegradation performance relative to MoS2 and mechanical mixture of MoS2 with CNFs, with 67% Rh B completely degraded over 5 h-period. We attributed such enhancement in photocatalytic activity to the enhanced absorption property and electrical conductivity due to the synergy between MoS2 and CNFs. The hybrid can furthermore be easily separated from the solution and reused for the subsequent photodegradation cycles. We verified the negligible loss in the photodegradation activity of MoS2/CNFs hybrid towards Rh B during the three subsequent cycles. The high photocatalytic activity and recyclability of the hybrid render its practical application to degrade organic pollutants (i.e., dye compounds) in industrial wastewater.

Electrodeposited honeycomb-like cobalt nanostructures on graphene oxide doped polypyrrole nanocomposite for high performance enzymeless glucose sensing

Honeycomb-like cobalt nanostructures modified graphene oxide doped polypyrrole (CoNSs/RGO/PPy) nanocomposites were successfully prepared via a simple two-step electrochemical synthesis route. Firstly graphene oxide (GO) doped PPy nanocomposite was electrodeposited onto a pretreated glassy carbon electrode (GCE) to obtain GO/PPy nanocomposite; secondly honeycomb-like cobalt nanostructures were electrochemical reduced onto GO/PPy nanocomposite surface in a cobalt chloride solution at −1.0V. During the second reduction process, GO/PPy was reduced to a more conductive RGO/PPy nanocomposite simultaneously. The electrode modified with CoNSs/RGO/PPy nanocomposites exhibited outstanding electrocatalytic performance for enzymeless glucose sensing in alkaline media. Under optimum experimental conditions, the nonenzymatic glucose sensor displayed linear ranges from 0.5μM to 2.667mM, a high sensitivity of 297.73μAmM−1cm−2, a very low detection limit of 29nM (at S/N=3) and a superfast response time of 1s. The developed glucose sensor displayed favorable selectivity against common interferents, excellent stability and high reproducibility, and it has great potential to successfully detect glucose concentration in real biological samples.

Enzyme-free glucose sensor based on heteroatom-enriched activated carbon (HAC) decorated with hedgehog-like NiO nanostructures

An effective two-step synthesis route was developed to obtain a heteroatom-enriched activated carbon-nickel oxide (HAC-NiO) nanocomposite by an eco-friendly chemical activation and hydrothermal method. The nanomaterials were characterized by scanning electron microscopy, X-ray diffraction, N2 adsorption-desorption isotherms. Furthermore, the NiO-HAC nanocomposite was used to modify glass carbon electrode (NiO-HAC/GCE) and build a novel glucose sensor. The electrochemical properties revealed that it exhibited a wide linear range (10μM–3.3mM) and a low detection limit (1μM) toward glucose oxidation. The excellent electrocatalytic performance can be attributed to the unique surface architectures of NiO with good electron transfer rate and HAC with large active surface area during the electrochemical sensing process. High reproducibility, good anti-interference, desirable stability and enough precision made it a potential material for the development of enzyme-free sensor in real sample analysis.