COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Chengcheng Qi,Wei Xiang,Yongping Dong,Wangbing Zhang
The development of new highly active electrocatalysts is one of the key factors to improve the performance of enzyme-free electrochemical sensors . In this paper, Co 3 V 2 O 8 was proposed as a new electrocatalyst for nonenzymatic oxidation of H 2 O 2 . A facile self-templating strategy was adopted for the synthesis of Co 3 V 2 O 8 nanomaterial which was further characterized by transmission electron microscopy (TEM), powder X-ray diffractometry (XRD), fourier translation infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and electrochemical techniques . The results showed that porous Co 3 V 2 O 8 sphere was constructed from interconnected nanoparticle with a three-dimensional porous structure. Such unique structure made the sensor based on Co 3 V 2 O 8 exhibit good electrocatalytic activity toward H 2 O 2 oxidation, and could detect H 2 O 2 with a low detection limit of 0.34 µM, a wide linear range of 2.0 µM to 6.1 mM and a high sensitivity of 541.4 µA mM −1 cm −2 . This work demonstrated an effective new sensing platform for nonenzymatic detection of H 2 O 2 .
研究领域:
材料科学
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分析化学
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电化学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Shiteng Long,Yang Qin,Huafeng Fu,Jia Hu,Hansong Xue,Yu'an Chen,Fusheng Pan
Developing medium temperature hydrogen storage materials is important for the practical application of the Studies have demonstrated that V-based catalysts exhibit exceptional catalytic activity in the dehydrogenation of MgH 2 at medium levels. However, the V-base catalysts primarily concentrates on hydrogen desorption, and there is a necessity for further enhancement of hydrogen absorption properties. To solve this problem, herein we prepared a bimetallic oxide. Co can enhance the hydrogen absorption and desorption properties of MgH 2 as the catalyst and it influences the performance of hydrogen absorption more obviously than the hydrogen desorption performance. It is found that MgH 2 catalyzed by Co 3 V 2 O 8 can absorb 1.31 wt% hydrogen within 30 min even under room temperature and can release 3.41 wt% hydrogen within 120 min at temperatures as low as 225 °C. The activation energy of MgH 2 -6 wt.%Co 3 V 2 O 8 is determined to 68.5 kJ/mol, which is 50.2 % lower than that of Ball-MgH 2 . XRD combined with TEM measurements revealed that the in-situ formed Co and V 2 O 3 can weaken the H H and Mg H bonds respectively to improve the hydrogen storage properties of MgH 2 . These discoveries provide guideline of the further design of high efficiency catalysts for Mg-based hydrogen storage materials.
研究领域:
材料科学
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化学工程
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催化
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能源存储
✓ 已验证
DOI
高影响因子
Nano Materials Science
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2023
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IF 9.9
Ying Gao,Peng Ju,Yu Zhang,Yuxin Zhang,Xiaofan Zhai,Jizhou Duan,Baorong Hou
Since the catalytic activity of most nanozymes is still far lower than the corresponding natural enzymes, there is urgent need to discover novel highly efficient enzyme-like materials. In this work, Co 3 V 2 O 8 with hollow hexagonal prismatic pencil structures were prepared as novel artificial enzyme mimics. They were then decorated by photo-depositing Ag nanoparticles (Ag NPs) on the surface to further improve its catalytic activities. The Ag NPs decorated Co 3 V 2 O 8 (ACVPs) showed both excellent oxidase- and peroxidase-like catalytic activities. They can oxidize the colorless 3,3’,5,5’-tetramethylbenzidine rapidly to induce a blue change. The enhanced enzyme mimetic activities can be attributed to the surface plasma resonance (SPR) effect of Ag NPs as well as the synergistic catalytic effect between Ag NPs and Co 3 V 2 O 8 , accelerating electron transfer and promoting the catalytic process. ACVPs were applied in constructing a colorimetric sensor, validating the occurrence of the Fenton reaction, and disinfection, presenting favorable catalytic performance. The enzyme-like catalytic mechanism was studied, indicating the chief role of ⋅O 2 - radicals in the catalytic process. This work not only discovers a novel functional material with double enzyme mimetic activity but also provides a new insight into exploiting artificial enzyme mimics with highly efficient catalytic ability.
研究领域:
材料科学
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生物化学
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分析化学
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产品关联
DOI
高影响因子
Nanomaterials
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2020
·Vol. 10
·期 4
·740
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IF 4.324
Le Hu,Chaoqun Shang
Co3V2O8(CVO) with high theoretical specific capacity derived from the multiple oxidation states of V and Co is regarded as a potential electrode material for lithium-ion batteries (LIBs). Herein, reduced graphene oxide (rGO)-supported ultrafine CVO (rGO@CVO) nanoparticles are successfully prepared via the hydrothermal and subsequent annealing processes. The CVO supported on 2D rGO nanosheets possess excellent structural compatibility for the accommodation of volume variation to maintain the structural integrity of an electrode during the repeated lithiation/delithiation process. On the other hand, the rGO, as a highly-conductive network in the rGO@CVO composite, facilitates rapid charge transfer to ensure fast reaction kinetics. Moreover, the CV kinetic analysis indicates that the capacity of rGO@CVO is mainly dominated by a pseudocapacitive process with favorable rate capability. As a result, the rGO@CVO composite exhibits improved specific capacity (1132 mAh g−1, 0.1 A g−1) and promising rate capability (482 mAh g−1, 10 A g−1).Keywords:rGO@CVO;anode materials;rate performance;cycling stability;lithium-ion batteries
研究领域:
材料科学
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电化学
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能源存储
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Chuanyi Xu,Guanrong Yang,Jie Li,Shanqing Zhang,Yueping Fang,Feng Peng,Shengsen Zhang,Rongliang Qiu
The persistence and wide dispersion of antibiotics have a severe impact on the ecological environment. Developing an effective method with universal applicability to remove pollutants is pretty necessary. Herein, a bimetallic oxides (Co 3 V 2 O 8 ) heterogeneous material was successfully prepared and used to activate the persulfate (PS) for purification of tetracycline (TC) wastewater. By exploring the reaction conditions and influencing factors, the removal rate of 50 mg⋅L -1 TC reached 87.1% by Co 3 V 2 O 8 /PS system, and the reaction rate constant was up to 0.0271 min −1 . As a highly efficient catalyst for the activation of PS, Co 3 V 2 O 8 /PS system produces radicals of SO 4 •− , •OH, •O 2 – and 1 O 2 in the reaction process due to the Co(II) and V(IV) exchange electrons with S 2 O 8 2- and O 2 . Simultaneously, the internal electron exchange occurs between Co(II)/Co(III) and V(IV)/V(V), which stabilizes the content of Co(II) and V(IV). This work provides a novel activator for PS activation to degrade contaminants and contributes to a better understanding of the PS activation mechanism by transition compound.
研究领域:
环境科学
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催化化学
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污染治理
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产品关联
DOI
PubMed
高影响因子
SOLID STATE SCIENCES
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2024
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IF 3.4
Xiangyu Cao,Guoyu Liu,Jianhua Zheng,Zhihui Sui,Shunji Zheng,Qi Zhang
Considering the important role of morphology and interface during the photocatalytic process, the g-C 3 N 4 @Co 3 V 2 O 8 Z-scheme heterojunction photocatalyst was successfully prepared by a facile hydrothermal method and subsequent wet-impregnation treatment. The sample synthetic method allowed ultra-thin g-C 3 N 4 nanosheets to uniformly adhere on the surface of Co 3 V 2 O 8 hollow spheres, which not only avoided the aggregation of g-C 3 N 4 nanosheets but also benefited from forming a multidirectional contact interface to short the transfer distance of photoelectrons between g-C 3 N 4 and Co 3 V 2 O 8 . Benefitting from the unique hollow structure and Z-scheme configuration, g-C 3 N 4 @Co 3 V 2 O 8 composite with 10 % g-C 3 N 4 showed a better photocatalytic degraded performance, achieving 93.7 % degradation efficiency of methylene blue (MB) in water within 60 min, which was 3.1 and 1.9 times higher than these of pristine Co 3 V 2 O 8 and g-C 3 N 4 , respectively. The active species analysis demonstrated that ·O 2− and ·OH played a pivotal role in the photocatalytic degradation of MB. Based on the experimental results a comprehensive photocatalytic degradation mechanism was proposed. Our work provided an opportunity to design Z-scheme heterojunction photocatalysts for pollutant degradation in wastewater.
研究领域:
材料科学
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环境催化
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光催化
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纳米材料
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废水处理
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DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2023
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IF 3.3
Rui Yu,Zhaokuan Li,Qing Wang
In this work, MnCo 2 O 4 /Co 3 V 2 O 8 composite nanomaterials were synthesized using a straightforward secondary hydrothermal and calcination process. Importantly, Co 3 V 2 O 8 as a pseudocapacitive material with unique intercalation/delamination reaction, and the stored charge behavior of MnCo 2 O 4 material is a battery-like behavior. These two different reaction mechanisms, when working in parallel, can produce an interfacial and synergistic effect, thus providing high reversible capacity and better electrochemical activity, and the composite has good electronic conductivity and superior electrochemical properties. The prepared MnCo 2 O 4 /Co 3 V 2 O 8 nanomaterial provides a high specific capacitance of 1460 F g −1 at 1 A g −1 and an excellent capacitance retention of 84.61 % (3500 cycles even at 10 A g −1 ). Hybrid supercapacitors consisting of MnCo 2 O 4 /Co 3 V 2 O 8 and activated carbon (AC) have a great energy density of 37.5 mAh g −1 . After 28,000 turns of uninterrupted constant current charging and discharging, it had an initial capacity ratio of 98.6 %. The electrochemical performance showed that the MnCo 2 O 4 /Co 3 V 2 O 8 nanometer material has broad prospects and can provide a new idea for the electrode materials of supercapacitors.
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2023
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IF 4.2
Hao Li,Yingwei Li,Ruirui Wang,Sheng Zhong,Ruirui Zhang,Ruixia Liu
Oxygen vacancies (OVs) engineering is essential in the regulation of the structure and properties of the catalysts for selective oxidation. In this work, the strategy of ionic liquid (IL) mediation was successfully developed in constructing the OV-rich defective Co3V2O8 (CVO), exhibiting excellent performance in cyclohexane oxidation. Coupling the prepotency of the heating treatment, ILs constructed optimal [Bmim][Ac]-CVO-700 possesses the highest OV concentration and catalytic activity with 12.7% cyclohexane conversion accompanied by 89.6% KA oil (cyclohexanol and cyclohexanone) selectivity. Experimental investigation reveals that ILs not only regulates the morphology structure as structure-directing agents but also benefits the formation of OVs through coordination with the Co2+ and V5+. The redox cycle between Co3+/Co2+ and V5+/V4+ was accelerated via the constructed OVs, enhancing the activation of substrates and the transfer of electrons. The distinguished performance is attributed to the rich OVs, porous structure, and synergistic effect between the active metals. The structure–activity relationship between OVs concentration and cyclohexane conversion further indicated that OVs facilitate the essential steps for the generation of targeted products. The possible reaction pathway of cyclohexane oxidation over the OV-rich CVO catalyst was also suggested regarding the radical trapping experiment. This design not only presents a facile and effective strategy for constructing OVs using ILs but also provides an in-depth insight into OV-rich mixed metal oxides in selective oxidation.
研究领域:
催化化学
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材料科学
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能源化学
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2025
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IF 19
Rui Wang,Rong Zhang,Yixin Yan,Gaoyang Li,Yuan Li,Fujuan Wang,Youzhi Wu,Fen Ran
Co 3 V 2 O 8 as a bimetallic oxide with “fast-charging” capacity presents some potential advantages, comprising decent theoretical specific capacity, favorable crystal structure, and intrinsic safety. Presently, although extensive research of Co 3 V 2 O 8 as an anode material are reported, the formed Co° from Co 3 V 2 O 8 after the initial discharging is not oxidized to CoO during the charging process, and the ion diffusion mechanism are not well clarified. The lithium-storage process of Co 3 V 2 O 8 and the diffusion mechanism of lithium ion in Co 3 V 2 O 8 are studied in detail in this work. A hollow-micropencil Co 3 V 2 O 8 prepared through the hydrothermal method without using surfactants or templates demonstrates a high “fast-charging” capability even at the current densities as high as 1.0–2.0 A g −1 . The electrochemical kinetic results illustrate that the hollow-micropencil Co 3 V 2 O 8 presents low charge transfer resistance. The distinctive lithium ion storage sites as well as diffusion paths are predicted. The in situ X-ray diffraction analysis is adopted to confirm that the formed Co° after the initial discharging is not oxidized to CoO during the delithiation process. The work not only helps to understand the lithium insertion mechanisms of Co 3 V 2 O 8 but also offers new means to develop “fast-charging” anode material for lithium-ion batteries with remarkable electrochemical performance.
研究领域:
材料科学
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电化学
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能源存储
✓ 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）