SENSORS AND ACTUATORS B-CHEMICAL
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2014
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IF 3.84
Li Wang,Yinjian Ye,Yuan Shen,Fanping Wang,Xingping Lu,Yingzhen Xie,Shouhui Chen,Hongliang Tan,Fugang Xu,Yonghai Song
The hierarchical nanocomposites of Co 3 O 4 /polyaniline (PANI) nanowire arrays/reduced graphene oxide sheets (rGO) was synthesized and characterized by scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy and thermogravimetric analysis. The electrocatalytic oxidation and detection of cysteine or N -acetyl cysteine based on the nanocomposites modified glassy carbon electrodes were investigated by cyclic voltammetry, double potential step chronoamperometry and amperometric responses. The results suggested that the modified electrode showed good electrocatalytic performance for cysteine and N-acetyl cysteine. Two linear calibration ranges of 12–1280 μM and 1280–20,800 μM were obtained and the detection limit was estimated to be 4.0 μM according to the first linear calibration range. For the N -acetyl cysteine, two linear ranges were from 12 to 2560 μM and 2560 to 24,800 μM, respectively. The detection limit was estimated to be 5.2 μM according to the first linear calibration range.
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MATERIALS RESEARCH BULLETIN
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2015
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IF 2.288
Yu-zhi Su,Qi-zhi Xu,Qi-sui Zhong,Chan-juan Zhang,Shu-ting Shi,Chang-wei Xu
Glycerol has a very high value of onset potential on the Au/C electrode, so it is difficult to be electrochemically oxidized on the pure Au electrocatalyst. When Co 3 O 4 , NiO, Mn 3 O 4 and MgO are added to the Au/C, the values of onset potential of glycerol oxidation shift negatively 171, 191, 156 and 215 mV than that on the Au/C. Au–Co 3 O 4 (wt 4:1)/C, Au–NiO(wt 5:1)/C, Au–Mn 3 O 4 (wt 5:1)/C and Au–MgO(wt 2:1)/C show the highest activity for glycerol electrooxidation for respective oxide promoted Au/C. The addition of oxides to the Au/C obviously promotes the catalytic activity and stability for glycerol electrooxidation.
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SYNTHETIC METALS
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2016
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IF 2.299
Xianbin Liu,Ziping Wu,Yanhong Yin
Chemical doping with heterogeneous atoms is an effective method to improve the intrinsic properties of graphene. In this work, a competitive type of highly nitrogen-doped graphene (HNG) and its composites hybridized with Co 3 O 4 nanoparticles were synthesized via simple pre-mixing followed by a hydrothermal method. The highest nitrogen content achieved was 11.7%, which endowed the graphene with superior electrochemical performance. Co 3 O 4 nanoparticles could be obtained with an optimal size of approximately 80–100 nm and were homogenously anchored on the graphene nanosheets. Because of the synergy between the highly nitrogen-doped graphene and uniform Co 3 O 4 nanoparticles, the HNG/Co 3 O 4 hybrids exhibited enhanced rate capability and cycling stability, which were considerably higher than those of bare HNG and Co 3 O 4 . As the current density increased from 0.2 to 5 A g −1 , 80.6% of the specific capacitance was retained. Moreover, over 84.5% of the original specific capacitance was maintained after cycling 1000 cycles. This study has demonstrated the significance of nitrogen doping on the performance of graphene-based materials for supercapacitor electrodes.
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MATERIALS RESEARCH BULLETIN
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2017
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IF 2.446
Chunpei Yu,Wenchao Zhang,Yu Gao,Yajie Chen,Kefeng Ma,Jiahai Ye,Ruiqi Shen,Yang Yang
Co 3 O 4 nanowires (NWs) arrays were successfully fabricated via a facile hydrothermal-annealing method. The component, structure and morphology of the Co 3 O 4 NWs arrays were characterized. The slim Co 3 O 4 NWs consist of interconnected nanocrystals and have a specific surface area of 26.6 m 2 g −1 . The obtained materials have exhibited an excellent catalytic performance on the thermal decomposition of ammonium perchlorate (AP). In addition, catalytic activities of the prepared Co 3 O 4 mainly depend on the content of catalyst. Impressively, an addition of 9 wt% Co 3 O 4 NWs arrays to AP exhibited the most significant catalytic effect in lowering the decomposition temperature from 404 to 288 °C, increasing the decomposition heat from 502 to 930 J g −1 and decreasing the activation energy from 201 to 168 kJ mol −1 . Furthermore, the catalytic mechanism of the Co 3 O 4 NWs arrays based on electron transfer processes was discussed.
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RSC Advances
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2016
·Vol. 6
·期 85
·82033-82039
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IF 3.289
Shanying Han,Tianyu Du,Lanmei Lai,Xuerui Jiang,Chuansheng Cheng,Hui Jiang,Xuemei Wang
A sensitive sensor for the detection of dopamine (DA) and uric acid (UA) was fabricated by Fe3O4–Co3O4 bimetallic oxides anchored at a reduced graphene oxide (rGO) film-modified glassy carbon electrode (GCE). The Fe3O4–Co3O4 and rGO showed a synergistic effect towards the electrochemical catalytic oxidation of DA and UA, with the peak currents increased by 271.7% and 590%, respectively, when compared with those on bare GCE. The as-prepared Fe3O4–Co3O4/rGO based sensor supplied with a wide linear range from 5 × 10−7 to 1.55 × 10−3 M and a low detection limit (LOD) of 1.3 × 10−7 M (S/N = 3) for DA detection, and the linear range for UA detection was from 1.5 × 10−6 to 1.6 × 10−3 M and LOD was 1.8 × 10−7 M. In addition to the anti-interference capacity of electroactive molecules like ascorbic acid and 5-hydroxytryptamine, the sensor shows high recoveries for DA and UA detection in human serum samples, indicating that the as-prepared sensor exhibited high detection sensitivity and specificity, considerable stability and reproducibility, and excellent anti-interference capability.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2016
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IF 2.567
Daixiong Zhang,Qing Xiang
Because of its high energy density, an Al–Co3O4 reactive nanocomposite (Al–Co3O4 RNC) has attracted vast attention. In this study, Al–Co3O4 RNC was successfully prepared as a coating by an electrophoretic deposition (EPD) method. An ethanol–acetylacetone (1:1 in volume) mixture containing 0.25 mM nitric acid was employed as a suitable dispersion medium for EPD. Differential scanning calorimetry revealed that the obtained Al–Co3O4 was a high-energy coating with a maximum heat release of 2638 J·g–1. Moreover, an attempt at assembling an electrophoretic Al–Co3O4 RNC coating onto an electrothermal copper bridge was also made. A successful ignition test indicated that this novel Al–Co3O4 RNC coating has great potential for application in the microignitor field.
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ELECTROCHIMICA ACTA
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2017
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IF 4.798
Bei Xue,Kezhi Li,Lei Feng,Jinhua Lu,Leilei Zhang
Graphene (G) wrapped porous Co 3 O 4 /NiCo 2 O 4 double-shelled nanocages (Co 3 O 4 /NiCo 2 O 4 DSNCs@G) were prepared by the formation of Co 3 O 4 /NiCo 2 O 4 DSNCs using zeolite imidazole frameworks-67 as template with the subsequent calcination and package of G by hydrothermal method. The abundant accessible active sites provided by the porous structure of Co 3 O 4 /NiCo 2 O 4 DSNCs and efficient electron transport pathways for electrocatalytic reaction offered by the high conductive G worked very well together in a ferocious synergy, which endowed Co 3 O 4 /NiCo 2 O 4 DSNCs@G with excellent electrocatalytic behaviors for determining glucose. A comparison between Co 3 O 4 /NiCo 2 O 4 DSNCs without G packing and Co 3 O 4 /NiCo 2 O 4 DSNCs@G showed that former had linear response window concentrations of 0.01-3.52 mM (correlation coefficient = 0.999), detection limit of 0.744 μM (S/N = 3) and sensitivity of 0.196 mA mM −1 cm −2 , whereas the latter exhibited linear response window concentrations of 0.01-3.52 mM (correlation coefficient = 0.999), detection limit of 0.384 μM (S/N = 3) and sensitivity of 0.304 mA mM −1 cm −2 . The combination of Co 3 O 4 /NiCo 2 O 4 DSNCs and G was a meaningful strategy to fabricate high-performance non-enzyme glucose sensors with low detection limit, good selectivity and high sensitivity.
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Electrocatalysis
·
2024
·Vol. 15
·期 4
·344-352
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IF 2.7
Zhang Xihuan,Jaouhari Abdelhadi El,Li Chunyue,Adnane Maimoune,Liu Wanying,Mellalou Abderrahman,Ghamouss Fouad,Lin Yuanhua
The oxygen evolution reaction (OER) holds pivotal importance in sustainable energy conversion, as it forms the critical half-reaction in various electrochemical processes, including water splitting for hydrogen production and rechargeable metal-air batteries. Here, a CoFe 2 O 4 @Co 3 O 4 nano-composite was synthesized using a facile hydrothermal process and deposited onto the surface of nickel foam through electrophoresis. Characterization using XRD, Raman spectroscopy, and XPS confirmed the successful synthesis of the composite, exhibiting characteristic peaks of both Co 3 O 4 and CoFe 2 O 4 . The nano-composite exhibited a more amorphous phase than pure oxides, benefiting electrocatalytic activity. Scanning and transmission electron microscopy highlighted the composite’s morphological characteristics, showcasing a Co 3 O 4 island distribution on the CoFe 2 O 4 surface. Electrochemical evaluations revealed the superior oxygen evolution reaction (OER) performance of CoFe 2 O 4 @Co 3 O 4 , with low overpotentials, faster kinetics, and enhanced stability compared to pure oxides and the benchmark RuO 2 catalyst. A comprehensive analysis was carried out to investigate the dynamic behavior during electrocatalytic oxygen evolution reaction. This study unveils the intricate charge and electron transfer mechanisms between cobalt and iron atoms, providing insights into their collaborative role throughout the OER process. Graphical Abstract
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FUEL
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2024
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IF 6.7
Yanhong Wang,Dabin Zhang,Xiaoqiang Du,Xiaoshuang Zhang
How to prepare clean energy has always been a problem to be solved by the modern green chemical industry. Compared with the electrolysis of water to produce hydrogen, electrolysis of seawater for raw material requirements are lower and more widely used. However, the lacks of maturity of the technology, the high cost and the generation of harmful gases such as chlorine in the electrocatalytic process have hindered the development of this process. This study demonstrates a construction of heterogeneous structure based on Co ions as an efficient multifunctional catalyst for overall seawater splitting and urea oxidation. This hybrid structure can combine nanosheets and nanowires, thus exposing the catalyst to more active sites and shortening the ion diffusion path. Comparing the hybrid structure with the single structure, Co 3 O 4 @CoP exhibits excellent multifunctional catalytic activity in alkaline seawater and urea. In the oxygen evolution reaction, the working potential is only 1.60 V and 1.70 V at a current density of 50 mA/cm 2 and 100 mA/cm 2 . And in the hydrogen evolution reaction, the working potential was only −0.16 V at a current density of −10 mA/cm 2 , demonstrating excellent bifunctional activity. On this basis, the catalyst also demonstrated excellent activity for urea oxidation reaction in alkaline environment, with an operating potential of only 1.28 V at a current density of 10 mA/cm 2 . And the durability of this catalyst is good, it can keep 5 mA/cm 2 for 12 h under the constant voltage of 1.45 V, but the initial potential falls off too fast, and there is a decline in performance, which is closely related to the corrosion of Cl - present in seawater. It was shown by density functional theory (DFT) that hierarchical nanostructures can increase the transfer rate of reaction intermediates and the water adsorption energy. At the end of this study, by comparing single nanostructures with hybrid nanostructures, it can be reasonably conjectured that the accompanying increase in the number the heterostructure is resistant to Cl - corrosion in seawater.
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Journal of Environmental Chemical Engineering
·
2025
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IF 7.2
Jiepeng Zhao,Yifei Ma,Zhaomin Tong,Mei Wang,Liantuan Xiao,Suotang Jia,Xuyuan Chen
Engineering photocatalyst crystal facets and constructing heterojunctions are effective strategies to improve photocatalytic activity. The amino-modified titanium-based metal–organic framework (MOF) NH 2 -MIL-125(Ti) (NM) has drawn extensive attention as a photocatalyst by virtue of its high specific surface area, abundant pore structure, and narrow bandgap. However, its catalytic activity is hindered by fast electron-hole recombination and limited light absorption. This study synthesizes NM with engineered crystal facets and Co 3 O 4 @NH 2 -MIL-125(Ti) (C-NM) composites with varying Co 3 O 4 loadings using a facile hydrothermal method. The impact of heterojunctions and facet design on photocatalytic CO 2 reduction under visible light is also studied. Results show that the C-NM, with exposed {111} facets and optimal Co 3 O 4 loading, demonstrates superior photocatalytic CO and CH 4 production rates of 21.64 μmol h −1 g −1 and 3.99 μmol h −1 g −1 , 2.1 and 1.6 times higher than those of NM {001} , respectively. Experimental characterization and density functional theory (DFT) analyses attribute the improved photocatalytic activity to several mechanisms. First, crystal facet modulation can optimize the active sites and specific surface area of the photocatalysts. Second, by loading the narrow-bandgap Co 3 O 4 nanoparticles, bandgap of the C-NM photocatalyst is further reduced, thereby enhancing the absorption and utilization of visible light. Finally, the NM/Co 3 O 4 heterostructure minimizes electron-hole recombination, significantly boosting CO 2 reduction efficiency.
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VACUUM
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2024
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IF 3.8
Na Liu,Weiyi Bu,You Zhou,Yan Zhang,Xiaohong Chuai,Geyu Lu
Metal-organic frameworks (MOF)-derived materials have been a research hotspot in the field of gas sensor. In this work, the MOF-derived spindle-like In 2 O 3 mixed with the ZIF-67 was calcined to obtain xCo-In (x = 0.03, 0.05, 0.07) sensing composite materials. Various characterization techniques, such as XRD, SEM, TEM, UV–vis and XPS were adopted to analyze their crystalline structures, detailed morphology structures, texture properties, bandgap width and element valence states. For In 2 O 3 /Co 3 O 4 composites, their sensing properties for acetone are greatly improved compared with pure In 2 O 3 , and the response of 0.05Co-In to 100 ppm acetone can reach 226.1 at an operating temperature of 175 °C with a response time of 1 s In 2 O 3 /Co 3 O 4 composites remained the morphologies of MOF templates, exhibiting large specific surface area. Combining the gas-sensitive behavior with characterization results, the effect of heterojunction between In 2 O 3 and Co 3 O 4 is discussed. Their interface interaction increases the ratio of Co 2+ /Co 3+ , content of oxygen vacancy/adsorbed oxygen, and material resistance, being important reasons for the improved sensing performance. The prominent interface effect may originate from Co 3 O 4 which has the variable valence ion. This work provides a strategy for constructing heterojunction to achieve a high-performance gas sensor.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
·
IF 8.1
Jinhui Wang,Yuting Li,Quanhui Hou,Peng Jiang,Zhao Ding,Yonglian Xiong
Magnesium-based materials are favored by researchers because of their high hydrogen storage capacity, but they cannot be put to daily use because of their more demanding reaction conditions. Recently, the method to improve the hydrogen storage performance of MgH 2 by catalyst doping has been widely investigated. In this paper, Co 3 O 4 catalysts were prepared by homogeneous precipitation method. It was demonstrated that the Co 3 O 4 catalyst could effectively improve the hydrogen storage performance of MgH 2 . According to the experimental results, the dehydrogenation onset temperature of the MgH 2 +15 wt% Co 3 O 4 composite was about 200 °C, which was about 130 °C lower than that of pure MgH 2 , and the amount of dehydrogenation was 6.26 wt%. The dehydrogenation activation energy of the MgH 2 +15 wt% Co 3 O 4 composite was reduced to 89.13 kJ/mol, which was about 45.7% lower than that of pure MgH 2 . After complete dehydrogenation, the composites started to absorb hydrogen at 50 °C with 6.2 wt%, while the activation energy of reabsorption was also reduced to 47.97 kJ/mol. After 10 cycles of MgH 2 +15 wt% Co 3 O 4 composites, the hydrogen storage capacity of MgH 2 could still be maintained at 99%, which indicated that it had good cycling stability. It was confirmed by various characterizations that Co 3 O 4 was uniformly distributed on the MgH 2 matrix after ball milling . After the first reaction, Co 3 O 4 was converted to CoO, which was uniformly attached to the Mg/MgH 2 surface and stabilized during the cycling process, continuing to provide active sites for hydrogen.
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