Transition-Metal Oxynitride: A Facile Strategy for Improving Electrochemical Capacitor Storage
Transition-Metal Oxynitride: A Facile Strategy for Improving Electrochemical Capacitor Storage
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过渡金属氮氧化物：改善电化学电容器存储的简便策略
DOI：
10.1002/adma.201806088
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发表时间：
2019
影响因子：
29.4
通讯作者：
Hao Xiaopeng
中科院分区：
文献类型：
--
作者：
Wang Shouzhi;Li Lili;Shao Yongliang;Zhang Lei;Li Yanlu;Wu Yongzhong;Hao Xiaopeng
使用过渡金属氧化物（TMO）作为长寿命电化学储能材料仍然具有挑战性，因为 TMO 在储能过程中会发生体积膨胀。在这项工作中，在 TMO 纳米线上合成了过渡金属氮氧化物层（TMON、M：Fe、Co、Ni 和 V），以解决体积膨胀的关键问题。独特的氮氧化物层拥有众多的活性位点、优异的导电性和出色的稳定性。这些特性有效提高了比电容并缓解了体积膨胀。具体而言，TMON电极的比容量相对于其相应氧化物的比容量增强了大约两倍。值得注意的是，即使在 10000 次循环后，TMON 的电容仍保持在 94% 以上。该结果表明TMON电极的循环性能优于其相应氧化物。通过第一原理和定量动力学分析来研究 TMON 层电化学性能改善的机制。结果表明，所提出的 TMON 层在能量存储、转换等领域具有有吸引力的应用。
The use of transition‐metal oxide (TMO) as an extended‐life electrochemical energy storage material remains challenging because TMO undergoes volume expansion during energy storage. In this work, a transition‐metal oxynitride layer (TMON, M: Fe, Co, Ni, and V) was synthesized on TMO nanowires to address the crucial issue of volume expansion. The unique oxynitride layer possesses numerous active sites, excellent conductivity, and outstanding stability. These characteristics enhance specific capacitance and alleviate volume expansion effectively. Specifically, the specific capacity of the TMON electrode is enhanced by approximately twofold relative to that of its corresponding oxide. Notably, the capacitance of the TMON remains above 94% even after 10 000 cycles. This result indicates that the cycling performance of the TMON electrode is superior to that of its corresponding oxide. First‐principles and quantitative kinetics analyses are performed to investigate the mechanism underlying the improved electrochemical performances of the TMON layers. Results demonstrate that the proposed TMON layer has attractive applications in the fields of energy storage, conversion, and beyond.