Journal of Energy Chemistry
·
2020
·
IF 7.216
Jing Zhou,Hansheng Xiao,Wei Weng,Dong Gu,Wei Xiao
Implementation of non-precious electrocatalysts is key-enabling for water electrolysis to relieve challenges in energy and environmental sustainability. Self-supporting Ni-V 2 O 3 electrodes consisting of nanostrip-like V 2 O 3 perpendicularly anchored on Ni meshes are herein constructed via the electrochemical reduction of soluble NaVO 3 in molten salts for enhanced electrocatalytic hydrogen evolution. Such a special configuration in morphology and composition creates a well confined interface between Ni and V 2 O 3 . Experimental and Density-Functional-Theory results confirm that the synergy between Ni and V 2 O 3 accelerates the dissociation of H 2 O for forming hydrogen intermediates and enhances the combination of H* for generating H 2 .
研究领域:
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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yuexin Liu,Tongde Wang,Yuning Sun,Mingcheng Zhang,Guohua Gao,Jinhu Yang,Kefeng Cai
Layered vanadium oxides have recently emerged as ideal cathode materials for aqueous zinc-ion batteries (ZIBs) due to their high theoretical capacity and low cost. However, their inherent shortages of narrow interlayer distance and poor electric conductivity cause sluggish reaction kinetics and low structure stability, leading to battery performance deterioration. Herein, we developed a novel strategy to simultaneously realize the intercalation of conductive polymer into V 2 O 5 polyhedrons and exfoliation of the V 2 O 5 into ultrathin nanosheets. The strategy is realized by in-situ polymerization of 3,4-ethylene-dioxythiophene (EDOT) monomers in the interlayer of the V 2 O 5 polyhedrons that were derived from the annealing of vanadium-based metal–organic frameworks (MIL-100(V)) in air. The MIL-100-derived V 2 O 5 polyhedrons assembled into porous microspheres (PVO) with abundant porosity and small particle size, which facilitates the penetration of EDOT molecules into the interior of the PVO during in-situ intercalation and polymerization processes, ultimately leading to the V 2 O 5 polyhedrons exfoliating into ultrathin nanosheets. The uniform poly(3,4-ethylene-dioxythiophene) (PEDOT) layer and abundant oxygen vacancies in PVO@PEDOT nanosheets can accelerate the diffusion of electrons and zinc ions, which are evidenced by dynamic analysis, ex-situ characterizations, and density functional theory (DFT) calculations, revealing the synergetic effect of PEDOT and oxygen vacancies. Therefore, the PVO@PEDOT cathode exhibits high specific capacity (403.7 mAh g -1 at 0.2 A g -1 ), superior rate capability (312.8 mAh g -1 at 10 A g -1 ), and long-term stability (92.8% of the initial capacity remained after 3000 cycles), which is superior to the majority of ion intercalation improved V 2 O 5 .
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Man Qi,Xi Chen,Heng Zhong,Jingwei Wu,Fangming Jin
The “shell biorefinery” has been proposed and developed rapidly in recent years, which valorizes the underestimated chitin biopolymer from oceanic waste to complement the lignocellulosic biomass for renewable chemicals. Herein, we exploited a simple and effective method to convert chitin biomass into acetic acid (AA) by using vanadium pentoxide (V2O5) and oxygen gas (O2) in base-free water, which makes the process more environmentally and economically favorable than previous methods. Under optimal conditions, the highest AA yield was obtained in 33.4% and 30.0% from the chitin monomer N-acetyl-d-glucosamine (NAG) and ball milled chitin (BM chitin) polymer. The V2O5 catalyst has multifunctionally facilitated the hydrolysis, deacetylation, and subsequent oxidation into AA. FTIR and XRD analyses were conducted for the solid residues after the reaction. The FTIR spectra of the solid residues highly resembled that of chitin, inferring that chitin hydrolysis into NAG probably happened prior to deacetylation. Besides, XRD data demonstrated that the reaction system could effectively destruct the crystalline regions during the reaction. The study demonstrated a new catalytic approach for chitin biorefinery to renovate the shell waste into valuable chemicals.
研究领域:
生物化学
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可再生资源与环境科学
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DOI
高影响因子
POWDER TECHNOLOGY
·
2023
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IF 5.2
Fupeng He,Jianbo Zhao,Qingqing Hu,Yongjie Liu,Qingyun Huang,Zhixiong You,Xuewei Lv
We investigate the isothermal kinetics of the reduction and nitridation of V 2 O 3 using NH 3 . The reaction mechanism is also discussed based on the thermodynamic and experimental results. The reaction procedure between V 2 O 3 and NH 3 can be divided into two stages. The first stage is mainly the deoxygenation process, whereas the second is the nitridation process. The deoxygenation process follows a two-dimensional phase boundary reaction model, and a modified integrated model (IM + diffusion) was proved to be the best function at temperatures above 1023 K. For the second stage, the three-dimensional diffusion model is determined as the mechanism function. Thermodynamic analysis predicts the feasibility between V 2 O 3 and NH 3 to form VN . The VN product is a solid solution (VN x O y ) (0 < x,y < 1, x + y = 1), which can be formed at 873 K. The Rietveld refinement analysis indicates the N content of VN x O y gradually increases with increasing temperature. The highest N content is approximately 15.83% at 1073 K for 2 h.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2024
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IF 8.1
Jiadong Wu,Linyu Yang,Shuying Wang,Xiaolong Yao,Jun Wang,Ablat Abliz,Xuefang Xie,Hongyu Mi,Haibing Li
The structure of V 2 O 5 as a cathode material is prone to collapse during repeated embedding/de-embedding of Zn 2+ , and the instability of the material limits its application. Introducing metal ions into the V 2 O 5 layer provides larger ion channels, improves cycling kinetics, and acts as a pillar to enhance the structure stability during the charge/discharge process. In this study, Zn 0·2 V 2 O 5 ·0.51H 2 O (ZVOH) is prepared by the hydrothermal method by embedding both Zn 2+ and structural water molecules in the V 2 O 5 interlayer. ZVOH is used as the cathode in zinc-ion batteries (ZIBs) with high power and energy densities (∼6779.3 W kg −1 and 289.6 Wh kg −1 ) and outstanding cycling stability. Furthermore, the valence changes of vanadium in ZVOH during charging and discharging as well as the morphological changes on the surface of the electrode material are investigated by ex-situ methods. The binding energy of Zn 2+ at the sites within ZVOH and the migration energy barrier for Zn 2+ migration on the ZVOH surface are also investigated by density functional theory.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
CARBON
·
2024
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IF 10.5
Jiajun Wu,Jianxian Zhou,Jiabin Guo,Yu Meng,Yucheng Xie,Ying Ling,Bin Zheng,Zhanyong Wang,Qichong Zhang
Vanadium pentoxide (V 2 O 5 ), due to its distinctive open-framework construction and significant theoretical capacity, has widespread applications in the rapid development of aqueous zinc-ion batteries (AZIBs) and pressure sensors. However, V 2 O 5 exhibits rapid capacity degradation and poor cycling stability due to its low electrical conductivity and ion diffusion rate, limiting its vast application prospects. Therefore, the self-supporting V 2 O 5 nanoarrays employing a Ni doping strategy on flexible carbon substrates act as an AZIBs cathode material (Ni–V 2 O 5 @CNTF), which possesses an enlarged interlayer space and high ion conductivity to provide a stable crystal structure for fast and reversible Zn 2+ insertion/extraction. More notably, the assembled Zn/Ni–V 2 O 5 @CNTF battery achieves a high capacity of 398.85 mAh cm −3 at 0.1 A cm −3 , superior rate performance and cycling stability for 2000 cycles. In addition, the V 2 O 5 nanoarrays grown on carbon cloth serving as the functional electrode material (Ni–V 2 O 5 @CC) are applied in a flexible resistive pressure sensor, exhibiting a high sensitivity of 0.8 kPa −1 from 0 to 5.0 kPa and stable sensing capabilities from 0 to 25 kPa. Furthermore, extensive applications are investigated in monitoring human activities and anti-intrusion pre-alarm systems. This work demonstrates a dual-functional fabric electrode based on Ni–V 2 O 5 , offering new guidelines for the next generation of multifunctional flexible electronic products.
研究领域:
材料科学
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能源存储
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传感器技术
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产品关联
DOI
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 4
·1054
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IF 5.076
Xianyu Liu,Liwen Ma,Yehong Du,Qiongqiong Lu,Aikai Yang,Xinyu Wang
Aqueous zinc-ion batteries (ZIBs) with the characteristics of low production costs and good safety have been regarded as ideal candidates for large-scale energy storage applications. However, the nonconductive and non-redox active polymer used as the binder in the traditional preparation of electrodes hinders the exposure of active sites and limits the diffusion of ions, compromising the energy density of the electrode in ZIBs. Herein, we fabricated vanadium pentoxide nanofibers/carbon nanotubes (V2O5/CNTs) hybrid films as binder-free cathodes for ZIBs. High ionic conductivity and electronic conductivity were enabled in the V2O5/CNTs film due to the porous structure of the film and the introduction of carbon nanotubes with high electronic conductivity. As a result, the batteries based on the V2O5/CNTs film exhibited a higher capacity of 390 mAh g−1at 1 A g−1, as compared to batteries based on V2O5(263 mAh g−1). Even at 5 A g−1, the battery based on the V2O5/CNTs film maintained a capacity of 250 mAh g−1after 2000 cycles with a capacity retention of 94%. In addition, the V2O5/CNTs film electrode also showed a high energy/power density (e.g., 67 kW kg−1/267 Wh kg−1). The capacitance response and rapid diffusion coefficient of Zn2+(~10−8cm−2s−1) can explain the excellent rate capability of V2O5/CNTs. The vanadium pentoxide nanofibers/carbon nanotubes hybrid film as binder-free cathodes showed a high capability and a stable cyclability, demonstrating that it is highly promising for large-scale energy storage applications.Keywords:aqueous zinc-ion battery;vanadium pentoxide;carbon nanotubes;hybrid film
研究领域:
材料科学
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电化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Wenyao Xue,Hongliang Fu,Guanjie Xue,Jing Zhao,Yue Lian,Zhifeng Wang,Yongfeng Hu,Huaihao Zhang
The oxygen evolution reaction (OER), a half-process of water electrolysis, involves four electron transfer processes with a high energy barrier, leading to slow reaction kinetics. Developing stable and high-efficiency OER electrocatalysts remains a major challenge in field of water electrolysis. Here, a novel Ni-doping V 2 O 5 @NC nanoflower-like catalyst is synthesized for OER reaction. Specifically, Ni-V 2 O 5 @NC is obtained by incorporating Ni into V 2 O 5 through a simply hydrothermal- carbonization process, using NH 4 VO 3 , Ni(NO 3 ) 2 ·6 H 2 O and H 2 C 2 O 4 · 2 H 2 O as raw materials. This approach can improve the OER activity and stability of V 2 O 5 . Ni-V 2 O 5 @NC presents the following advantages. Firstly, Ni-doping combined with nanoflower structure improves the reaction activity. Ni-doping generates more electrochemical active sites, facilitating the adsorption/desorption process of reaction intermediates and electron transfer, thereby enhancing catalytic activity. Besides, the nanoflower-like structure provides a relatively high specific surface area and more active sites to participate in the reaction, thus boosting the catalytic reactivity. Secondly, Ni with high conductivity and its doping into V 2 O 5 causes structural and performance changes of material, reducing the charge transfer resistance and optimizing the conductive property. Meanwhile, the inherent N and C from hydrothermal reaction also increase material conductivity. Also, Ni doping inhibits the stacking of V 2 O 5 lamellar structure while maintaining the catalyst’s activity, structural integrity and the improved stability. The electrochemical analysis results show Ni-V 2 O 5 @NC good electrochemical performance. Ni-60-V 2 O 5 @NC features a low overpotential (300 mV@10 mA cm −2 ) and a small Tafel slope (74.2 mV dec −1 ) in OER. Additionally, the overpotential of Ni-60-V 2 O 5 @NC only increases by 3 mV after 1000 cycles stability tests.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 11
·113505
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IF 4.316
Yapeng Kong,Yu Xiao,Xuemin Liang,Yuran Chen,Liqiang Wang
The availability of casting Ni–Fe alloy as inert anode for direct electro-reduction of V2O3 in molten Na3AlF6-K3AlF6-AlF3 was investigated. The electrochemical oxidation behavior of anode as well as microstructural evolutions of formed oxide scale were systematically studied. The electrochemical characterization and reaction mechanism of the cathode oxide were also investigated to evaluate the influence of alloy anode on cathodic reduction process. The in situ formed three-layered oxide scale is compact and coherent, which is composed of an outermost Fe2O3 + FeAl2O4 skin layer, a Fe2O3 middle layer and a FeAl2O4 inner layer. The skin layer has a continuous, smooth structure and shows electrochemical activity. The Fe2O3 layer with a compact structure prevents inward diffusion of electrolyte and outward migration of metal cations. The innermost FeAl2O4 layer shows a loose structure and functions as a buffer layer to improve the peeling resistance of oxide scale. With the continuous extension of polarization time, the inner FeAl2O4 layer is slowly oxidized and becomes thinner, simultaneously, the dense Fe2O3 layer becomes thicker. Ultimately, metal vanadium product with fine rod-like particles can be obtained and the oxygen content in the metal vanadium is below 0.3 mass% within electrolyzing time of 2 h. The corresponding current efficiency is around 63%.
研究领域:
冶金学
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材料科学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
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2022
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IF 7.336
Tongyu Liu,Linlin Chen,Xin Wang,Yaoguo Huang,Ming Wang,Yali Zhang
V 2 O 5 is considered as a promising cathode material for zinc ion batteries due to its abundance, low-cost, layered structure and high capacity. However, low electronic conductivity, vanadium dissolution accompanied with sluggish ion transport kinetics, severely limit its electrochemical performance. Herein, the polypyrrole-coated V 2 O 5 nanobelts arrays grown on carbon cloth (PPy@V 2 O 5 /CC) are rationally designed and prepared by combination of solvothermal and vapor-phase polymerization process. The resultant flexible PPy@V 2 O 5 /CC electrode delivers a high specific capacity of 276 mAh g −1 at 0.1 A g −1 , an excellent rate capability of 185 mAh g −1 at 10 A g −1 , and extraordinary long-term cycling stability with 76% capacity retention after 8000 cycles at 5 A g −1 , better than V 2 O 5 /CC. The significant enhancement can be attributed to the PPy protective layer, which can simultaneously achieve higher electronic conduction, suppressed vanadium dissolution, enhanced surface pseudocapacitive behavior, and faster Zn 2+ diffusion rate. This work offers a novel strategy for constructing high-performance micro/nano functional composites for electrochemical energy storage system.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2023
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IF 9.5
Yu Rao,Kongjun Zhu,Guoliang Zhang,Feng Dang,Jiatao Chen,Penghua Liang,Zhihan Kong,Jun Guo,Hongjuan Zheng,Jie Zhang,Kang Yan,Jinsong Liu,Jing Wang
Molybdenum sulfide has been widely investigated as a prospective anode material for Li+/Na+ storage because of its unique layered structure and high theoretical capacity. However, the enormous volume variation and poor conductivity limit the development of molybdenum sulfide. The rational design of a heterogeneous interface is of great importance to improve the structure stability and electrical conductivity of electrode materials. Herein, a high-temperature mixing method is implemented in the hydrothermal process to synthesize the hybrid structure of MoS2/V2O3@carbon-graphene (MoS2/V2O3@C-rGO). The MoS2/V2O3@C-rGO composites exhibit superior Li+/Na+ storage performance due to the construction of the interface between the MoS2 and V2O3 components and the introduction of carbon materials, delivering a prominent reversible capacity of 564 mAh g–1 at 1 A g–1 after 600 cycles for lithium-ion batteries and 376.3 mAh g–1 at 1 A g–1 after 450 cycles for sodium-ion batteries. Theoretical calculations confirm that the construction of the interface between the MoS2 and V2O3 components can accelerate the reaction kinetics and enhance the charge-ionic transport of molybdenum sulfide. The results illustrate that interfacial engineering may be an effective guide to obtain high-performance electrode materials for Li+/Na+ storage.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
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IF 2.758
Xiao Juan Kang,Jun Ming Zhang,Xiao Wen Sun,Feng Rui Zhang,Yu Xin Zhang
A novel graphene oxide (GO)-based nanostructure is synthesized by a one-pot hydrothermal reaction . The nano-hybrid composite materials are based on 2-dimensional (2D) GO sheets and 3-dimensional (3D) VO 2 flowers, which are composed of ultrathin 2-dimensional (2D) nanobelts . Interestingly, the 3D VO 2 flowers can be well controlled by fine-tuning the preparative parameters (e.g., temperature, reaction time). Such self-assembled 3D flower morphology possesses a higher surface area and a better contact with the graphene matrix, which could be an effective route to extend to other metal oxides .
研究领域:
材料科学
·
纳米技术
✓ 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）