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
Energy Storage Materials
·
2020
·
IF 16.28
Dongming Xu,Huanwen Wang,Ruyun Qiu,Qiang Wang,Zhifei Mao,Yingjun Jiang,Rui Wang,Beibei He,Yansheng Gong,Debao Li,Xianluo Hu
Sodium-ion hybrid capacitors (SIHCs) show great promise due to their combination of high energy-storage properties and low cost of Na resources. Yet most anodes in SIHCs suffer from sluggish Na + -diffusion kinetics and relatively low specific capacity, which restrict their widespread development. Herein, bowl-like VS 2 nanosheet arrays are uniformly and robustly anchored on a carbon nanofiber (CNF) substrate through a one-step solvothermal method. The bowl-like VS 2 is featured with an ultrathin thickness (several atomic layers), intrinsically metallic conductivity and an interconnected array architecture. This unique structural design can not only facilitate ultrafast Na + ion-diffusion, but also suppress capacity decay of VS 2 that is caused by the conversion process below 0.3 V. DFT calculations demonstrate a faster Na + transport rate and a lower diffusion energy barrier for the VS 2 /C interface than for the VS 2 /VS 2 bilayer. The quasi-solid-state SIHC full cell that integrates the CNF@VS 2 anode and the graphene sheets-wrapped carbon nanofiber (CNF@GS) cathode, displays prominent energy//power densities in the voltage range of 0.0–4.0 V (116 Wh kg −1 at 0.4 kW kg −1 ; 66 Wh kg −1 at 40 kW kg −1 based on the total mass of both electrodes), outperforming recent SIHCs.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Liangting Cai,Qiang Zhang,Jean Pierre Mwizerwa,Hongli Wan,Xuelin Yang,Xiaoxiong Xu,Xiayin Yao
All-solid-state lithium batteries employing inorganic solid electrolytes have been regarded as an ultimate solution to safety issues because of their features of no leakage as well as incombustibility and they are expected to achieve higher energy densities owing to their simplified structure. Two-dimensional transition-metal dichalcogenides exhibit a great potential in energy storage devices because of their unique physical and chemical characteristics. In this work, 50 nm thick highly crystalline layered VS2 (hc-VS2) nanosheets are prepared by a solvothermal method, and their electrochemical performances are evaluated in Li/75% Li2S-24% P2S5-1% P2O5/Li10GeP2S12/hc-VS2 all-solid-state lithium batteries. At 50 mA g–1, hc-VS2 nanosheets show a high reversible capacity of 532.2 mAh g–1 after 30 cycles. Moreover, stable discharge capacities are maintained at 436.8 and 270.4 mAh g–1 at 100 and 500 mA g–1 after 100 cycles, respectively. The superior rate capability and cycling stability are ascribed to the better electronic conductivity and well-developed layered structure. In addition, the electrochemical reaction kinetics and capacity contributions were analyzed via cyclic voltammetry measurements at different scan rates.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2014
·Vol. 39
·期 3
·1892-1898
·
IF 3.159
Xuehua Yin,Jin Cai,Hongyan Feng,Zeming Wu,Jianmei Zou,Qingyun Cai
A novel ultrasensitive sensing system for rapid fluorescence detection of cytochrome c (cyt c) was proposed by combining aptamer-based bioassay with VS2 nanosheets. VS2 nanosheets with high fluorescence quenching ability were synthesized by the solution route. A cyt c-binding aptamer was tagged with the fluorescent dye carboxy fluorescein (FAM), acting as the probe. VS2 nanosheets can adsorb the probe and quench its fluorescence efficiently. However, the fluorescence of the probe was retained when it was incubated with cyt c and then mixed with VS2 nanosheet solution. The proposed sensing system shows high selectivity and sensitivity, giving a linear range of 0.75 nM to 50 μM, and a limit of detection of 0.50 nM.
研究领域:
纳米技术
·
生物传感器
·
分析化学
·
生物分析化学
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2018
·Vol. 20
·期 35
·22563-22568
·
IF 3.906
Lu Wu,Ruimin Sun,Fangyu Xiong,Cunyuan Pei,Kang Han,Chen Peng,Yuqi Fan,Wei Yang,Qinyou An,Liqiang Mai
As a typical member of transition-metal dichalcogenides (TMDs), VS2 has been evaluated as the aluminum-ion battery cathode for the first time. To further improve their stability and conductivity, the as-prepared VS2 nanosheets are modified with graphene (denoted as G-VS2). And the G-VS2 electrode delivers a high initial discharge capacity of 186 mA h g−1 at 100 mA g−1 with almost 100% coulombic efficiency after 50 cycles. Furthermore, an explicit intercalation mechanism of Al into G-VS2 has been investigated by in/ex situ XRD, ex situ Raman and TEM spectroscopy. And the G-VS2 composite proves to be an impressive cathode material for aluminum-ion batteries (AIBs). This work might put forward the application of TMDs in AIBs.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
无机化学
·
固体物理
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Jing Xu,Yinbing Liu,Peilong Chen,Ao Wang,Ke-jing Huang,Linxia Fang,Xu Wu
Currently, the development of polyvalent ions battery systems are still restricted by lacking suitable cathode materials with high energy density and long cycle life attributing to sluggish kinetic mechanism and of polyvalent ions. Herein, an effective inter-layer scaling strategy is proposed by using a simple hydrothermal method . The super layer spacing VS 2 (∼1 nm) cathode dramatically improves electrochemical performance of zinc-ion batteries (ZIBs) and magnesium/lithium hybrid ion batteries (MLIBs). The specific discharge capacities of ZIBs and MLIBs are 450.7 and 488.8 mA h g −1 at current density of 0.1 A g −1 which are much higher than the same type of battery systems. Finally, the diffusion mechanism and the corresponding theoretical model is established by adopting first principles . In brief, the work provides an effective strategy for the large scale application of multivalent and hybrid batteries systems.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）