CRYSTENGCOMM
·
2021
·Vol. 23
·期 29
·5097-5105
·
IF 3.545
Zhenguo Wang,Ke Yu,Rong Huang,Ziqiang Zhu
With the development of the economy, energy shortages and the greenhouse effect gradually become problems facing humanity. Hydrogen energy is clean energy and is expected to become the most vital low-carbon energy in the future. At present, industrial hydrogen production mainly uses precious metals such as Pt. Therefore, it is of great significance to design a low-cost hydrogen evolution catalyst comparable in terms of hydrogen production performance and stability. In this work, porous Co3O4 with a hollow structure was prepared using the MOF template method, and VS2 nanosheets were uniformly attached and grown hydrothermally on it, thereby constructing a unique morphology of TS-Co3O4@VS2. The test results show that the catalyst can achieve a hydrogen evolution overpotential as low as 175.29 mV and a low Tafel slope (57.0 mV dec−1) and can work stably for 500 cycles at a current density of 100 mA cm−2 without noticeable performance degradation. Compared with other similar materials, this material significantly improves the kinetic process of the HER, reduces the reaction energy barrier for hydrogen evolution, and improves the operational stability of the catalyst. We believe that this material can provide a reference for the design of transition metal disulfide catalysts.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Lian-Kui Wu,Ji-Ming Hu
Nanoporous Co 3 O 4 (po-Co 3 O 4 ) films have been prepared on stainless steel substrate by a novel two-step method. Firstly, a composite Co 3 O 4 -SiO 2 film was fabricated via electrochemical co-deposition under a cathodic potential from the mixed sol-gel precursor. Then, the obtained composite film was underwent consecutive cycling voltammetries in a concentrated KOH solution to etch the SiO 2 component, leading to the formation of po-Co 3 O 4 films. The resultant film electrode exhibits satisfactory electrocatalytic property towards the oxygen evolution reaction (OER).
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Shuangming Wang,Jing Cao,Wen Cui,Longlong Fan,Xifei Li,Dejun Li,Tong Zhang
One dimensional porous Co 3 O 4 rectangular microrods (MR) are designed and successfully prepared by a distinctive electrospun precursor-hydrothermal regulation-annealing treatment strategy while Co 3 O 4 nanofibers (NF) are also synthesized for comparison by directly calcining precursors without hydrothermal treatment. The hydrothermal treatment before annealing process results in morphology and structure transition of Co 3 O 4 products from compact solid nanofibers to porous rods. When applied as a gas sensing material, Co 3 O 4 porous rods based sensors exhibit enhanced gas sensing properties in terms of rapid response time (3 s), recovery time (5 s), good selectivity and stability towards 100 ppm acetone gas at a relatively low working temperature of 200 °C. Meanwhile, the response of Co 3 O 4 porous rods toward 100 ppm acetone reaches approximately 5 times higher than that of solid Co 3 O 4 nanofibers. The enhanced acetone gas sensing properties of Co 3 O 4 rectangular porous rods are believed to originate from its porous structure and large surface area, facilitating gas adsorption and surface reaction and causing significant change in the thickness of holes accumulation layer (HAL). Feasible morphology-adjusting strategy and enhanced acetone gas sensing performances further highlight the advantage of as-prepared Co 3 O 4 porous rods in future acetone real-time monitoring.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Shi-Wen Lv,Lingjie Ye,Jialu Pan,Xiang Chen,Yi Liu,Yanqing Cong
It is of great significance to regulate rationally the activation mechanism of persulfate for promoting the development of sulfate radical-based advanced oxidation processes in wastewater treatment . Herein, carbon coated porous Co 3 O 4 with hollow structure was synthesized. Notably, the formation of porous hollow structure improved specific surface area of Co 3 O 4 and offered more redox couples of Co 2+ /Co 3+ , thereby reducing electron transfer resistance. Thus, the generation of reactive oxygen species and the role of high-valent transition metal complexes (namely Co 3 O 4 Co 4+ ) were improved. The formation of carbon layer on the Co 3 O 4 surface can avoid the release of Co ion during reaction process. Benefiting from the role of carbon layer in electron transport, catalyst-mediated the direct electron transfer from pollutant to PMS was boosted. Radical and nonradical pathways worked in coordination each other and realized the rapid removal of various organic pollutants in the presence of a little PMS. In short, current work revealed that modulating rationally the microstructure of catalyst was an efficient strategy for achieving controllable regulation of PMS activation process. More significantly, whether the direct electron transfer process can occur or not depended on both catalyst structure and electronic density of pollutants.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Ruyi Zou,Lin Zhu,Lijun Yan,Bo Shao,Xiaoping Zhang,Wei Sun
Porous Co 3 O 4 nanorods were synthesized by the thermolysis of organometallic cobalt oxalate precursor via ultrasonic assisted method. FT-IR, XRD, XPS, SEM, TEM and BET were applied to characterize the effect of thermal treatment temperature on the properties of porous Co 3 O 4 nanorods. A three-electrode system was used to perform cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge-discharge measurements to study the electrochemical behaviours of Co 3 O 4 nanorods modified nickel foam electrodes. Compared with Co 3 O 4 prepared by pyrolysis at various temperatures, Co 3 O 4 nanorods obtained at 300 °C had the highest specific capacitance of 226.80 F·g -1 at a current density of 1 A·g -1 in the potential range of -0.4 to 0.6 V (vs. Hg/HgO). After performing 1000 cycles in 2 M KOH electrolyte, 99.76% of specific capacitance was retained, showing the excellent stability of Co 3 O 4 nanorods modified electrode.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Wenying Zou,Yue Tang,Hong Zeng,Chunxiao Wang,Yuangen Wu
The current method for rapid and ultrasensitive detection of multiple heavy metals in environmental water still face challenge. Herein, the porous Co 3 O 4 nanodisks with robust peroxidase-mimicking activity were prepared, and its catalytic activity can be significantly inhibited by the heavy metals like Cd(II), Hg(II), Pb(II) and As, which makes us to establish an ultrasensitive and rapid colorimetric sensor for the detection of multiple heavy metals. Further investigation reveals the anticompetitive inhibition effect of heavy metals on peroxidase-mimicking activity. The colorimetric sensor displays excellent sensitivity and selectivity , and the limits of detection (LOD) for Cd(II), Hg(II), Pb(II) and As are 0.085 μg·L −1 , 0.19 μg·L −1 , 0.2 μg·L −1 and 0.156 μg·L −1 , respectively. Notably, the absorbance variation will be greater than 0.5 as the concentration of heavy metals exceeds 5 μg·L −1 , which can be clearly discriminated by the naked eyes. Moreover, the average recovery range of heavy metals in actual water samples is from 86.9% to 98.3%. The above results indicate that the proposed sensor exhibits excellent practical applicability for the rapid and ultrasensitive detection of multiple harmful heavy metals in several environmental water samples, which has potential bright application in protecting the environment and human health.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2018
·Vol. 410
·期 29
·7663-7670
·
IF 3.307
Liu Fuyan,Wang Peng,Zhang Qianqian,Wang Zeyan,Liu Yuanyuan,Zheng Zhaoke,Qin Xiaoyan,Zhang Xiaoyang,Dai Ying,Li Lu,Huang Baibiao
Novel porous Co 3 O 4 nanosheets (NSs) were synthesized on the flexible carbon cloth (CC) substrate by a facile hydrothermal method and applied to construct a non-enzymatic sensor for glucose detection. The sensor is based on the electro-catalytic oxidation of glucose on the surface of Co 3 O 4 NSs. Since this particular nanostructure can provide large surface area and more active sites, the Co 3 O 4 NSs non-enzymatic sensor exhibits excellent analytical performance, such as a high sensitivity (8506 μA mM −1 cm −2 ), a fast response time (less than 6 s), low detection limit of 1 μM, good selectivity, and long-term stability. The results suggest that the porous Co 3 O 4 NSs have great potential applications in the development of sensors for enzyme-free detection of glucose.
研究领域:
材料科学
·
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Wenping Wang,Manshu Zhang,Ruiyu Mi,Yangai Liu,Jian Chen
Nanosized cobalt (II, III) oxide (Co 3 O 4 ) is a promising anode material in virtue of its relatively high theoretical capacity. In this study, nanosized Co 3 O 4 was fabricated by facile hydrothermal method followed by annealing. So-obtained samples exhibited integrated characteristics and advantages including porous nanosheets structure, oxygen vacancy , and pseudocapacitance Pseudo-capacitance. The splendid electrochemical properties of Co 3 O 4 electrodes are inseparable from these features providing synergistic effect. During insertion and extraction of lithium ion , porous nanosheets structure not only assisted in buffering volume changes, but also benefitted the transportation of electron/ion. Furthermore, abundant oxygen vacancies improved internal conductivity and promoted migration of lithium ion via regulating surface electronic structure. The pseudocapacitance behavior was instrumental in electrochemical kinetics. Consequently, the resulting nanosized Co 3 O 4 delivered fine discharge specific capacity (1502.5 mAh g −1 ) after 100 cycles at 200 mA g −1 accompanied by the superior capacity retention rate (97.8%). Discharge specific capacity (1093.5 mAh g −1 ) higher than that of graphite, was recorded even at a current density of 2 A g −1 . The results indicate that the as-obtained MNS-CoO 1.0M with excellent properties may act as promising alternative candidates for lithium storage materials.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2014
·
IF 1.968
Hongwei Che,Aifeng Liu,Junxian Hou,Xiaoliang Zhang,Yongmei Bai,Jingbo Mu,Renliang Wang
In this paper, one-dimensional porous Co 3 O 4 nanobelts were synthesized via a facile template-free hydrothermal method and subsequent the thermal decomposition. Their microstructures and morphologies were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis, fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and N 2 adsorption–desorption techniques. The results indicate that the reaction parameters such as the molar ratio of Co(NO 3 ) 2 ·6H 2 O to C 2 H 4 N 4 , the amount of Co(NO 3 ) 2 ·6H 2 O, the hydrothermal temperature and time play crucial rules in controlling the microstructures and morphologies of the as-prepared cobalt precursors. A possible formation mechanism was proposed. Moreover, the obtained porous Co 3 O 4 nanobelts exhibit ethanol gas sensing properties superior to the commercial Co 3 O 4 powders at a working temperature of 200 °C, suggesting their potential applications as nanosensors.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Rong Guo,Yongsheng Deng,Yinghao Jia,Caixin Shi,Wenpu Zhang,Ying Zhou,Xinghui Hou
In order to monitor the quality of the surrounding environment and realize the non-invasive screening of diabetes, it is necessary to develop a simple and sensitive acetone sensor. In this paper, GC x porous structures doped with different proportions of Ga element are prepared through calcining Co-MOF synthesized by solvothermal method . The findings indicate that the addition of Ga inhibits the further growth of grain and improves the uniformity of the adhered nanoparticles in GC x . Performance test shows that the GC4 sensor exhibit extremely ultra-high response (197.6, 50 ppm) acetone at 160 °C and relatively low detection limit of 0.1 ppm (2.3). The main reason for the significant improvement of GC x acetone sensitivity is that the introduction of Ga regulates the oxygen vacancy which provide rich reaction activation sites for the further reaction and diffusion of acetone and amplify resistance change by modulating the carrier concentration. A practical method for controlling oxygen vacancy and carrier concentration of sensing materials is shown in this work, which creates a new opportunity for the development of high-performance acetone sensors.
研究领域:
材料科学
·
化学传感器
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Xiaoqun Dong,Yingying Su,Ting Lu,Lichun Zhang,Liqian Wu,Yi Lv
In the present work, porous Co 3 O 4 was easily prepared via thermal decomposition of metal-organic frameworks (MOFs). TG, FT-IR, XRD, SEM, TEM and N 2 adsorption-desorption were employed for characterizing the synthesized products. Based on cataluminescence (CTL) transduction principle, three MOFs including dodecahedra ZIF-67, nanosheets packed Co-MOF-71, nanoplate Co-BTC, and their corresponding derivatives Co 3 O 4 were used as sensing materials for H 2 S detection, respectively. The dodecahedra ZIF-67-derived dodecahedra Co 3 O 4 with high specific surface and exposed {110} lattice planes presented superior strong CTL property, and had a good linear relation in the concentration range of 3.3–27.5 μg L −1 with the detection limit of 1 μg L −1 (S/N = 3), while the original MOFs displayed no CTL signal. Eighteen common volatile organic compounds (VOCs) were investigated as possible interference, and the results indicated that MOFs-derived porous dodecahedra Co 3 O 4 would be one of excellent sensing material candidates for monitoring H 2 S with a promising application in routine analysis.
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 58
·30573-30578
·
IF 3.708
Jun Wang,Bing Gao,Long Zhang,Rui Li,Jinpeng Shen,Zhiqiang Qiao,Guangcheng Yang,Fude Nie
Two-dimensional Co3O4 nanostructures with porous architectures are experiencing rapid development in functional material fields for their unique structures and properties. Porous Co3O4–C hybrid nanosheet (NS) arrays grown directly on various conducting substrates are synthesized by a controlled method for the first time via a facile hydrothermal synthesis approach in combination with heat treatment. These NS arrays reveal uniform hexagonal morphology and have combined properties of quasi-single-crystallinity and a pore network inside the architecture. A four-step formation mechanism is proposed to understand the growth process of nanosheet arrays grown on the substrate based on the change of morphology. Both the concentration of Co2+ and poly(vinylpyrrolidone) (PVP) play key roles in the formation of NS arrays. When tested as an anode material in lithium-ion batteries, the porous Co3O4–C hybrid NS arrays exhibit improved electrochemical properties of cyclic performance and high coulombic efficiency compared with the commercial Co3O4 and Co3O4/carbon nanocomposites. This approach, porous Co3O4–C NS arrays grown directly on different substrates (wafer, foam, alloy net, foil, especially flexible carbon cloth), provides an efficient route to produce NS arrays to meet the demand for diversity, and may be extended to synthesize other transition metal oxide materials for other applications.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）