Synthesis and Electrochemical Evaluation of Multivalent Vanadium Hydride Gels for Lithium and Hydrogen Storage
Synthesis and Electrochemical Evaluation of Multivalent Vanadium Hydride Gels for Lithium and Hydrogen Storage
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DOI：
10.1021/acs.jpcc.6b03011
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发表时间：
2016-05
影响因子：
3.7
通讯作者：
L. Morris;L. Smith;M. Trudeau;D. Antonelli
中科院分区：
文献类型：
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作者：
L. Morris;L. Smith;M. Trudeau;D. Antonelli
以四苯基钒为原料，通过热分解和氢化反应制备了一种芳基氢化钒凝胶，并对其电化学性能和储氢性能进行了评价。通过IR、XRD、XPS、氮吸附和TGA的表征表明，该材料主要由通过桥接氢化物和苯基结合在一起的II-IV氧化态的钒中心的混合物组成。探索电化学性质以探测可逆氧化态行为和对Li电池的可能应用，假设氢化物配体的低质量可导致相对于较重的钒氧化物和磷酸盐的上级重量性能。该材料显示可逆的氧化还原活性，并具有良好的峰值容量为131毫安时g-1，在1毫安cm-2的放电速率，相当于散装VO 2样品也在这项研究中进行了测试。经过50次重复充放电循环后，材料保留了36%的容量。该材料还显示了改进的...
A vanadium aryl hydride gel was prepared by thermal decomposition and subsequent hydrogenation of tetraphenyl vanadium and evaluated for electrochemical and hydrogen storage performance. Characterization by IR, XRD, XPS, nitrogen adsorption, and TGA suggests that the material consists predominantly of a mixture of vanadium centers in oxidation states of II–IV bound together by bridging hydride and phenyl groups. Electrochemical properties were explored to probe the reversible oxidation state behavior and possible applications to Li batteries, with the hypothesis that the low mass of the hydride ligand may lead to superior gravimetric performance relative to heavier vanadium oxides and phosphates. The material shows reversible redox activity and has a promising peak capacity of 131 mAh g–1, at a discharge rate of 1 mA cm–2, comparable to bulk VO2 samples also tested in this study. After repeated charge–discharge cycling for 50 cycles, the material retained 36% of its capacity. The material also shows impro...