氧化还原
钒
电子转移
动力学
电化学
材料科学
电化学动力学
流动电池
电极
化学工程
分析化学(期刊)
物理化学
化学
冶金
物理
工程类
电解质
量子力学
色谱法
作者
Rongjiao Huang,Suqin Liu,Zhen He,Weiwei Zhu,Guanying Ye,Yi Su,Weiwen Deng,Jue Wang
标识
DOI:10.1002/adfm.202111661
摘要
Abstract Fundamental kinetics of the V 2+ /V 3+ of vanadium redox flow battery (VRFB) are still not well understood despite tremendous efforts in improving the sluggish kinetics of V 2+ /V 3+ . This article first reveals the rate‐determining step in the electrochemical oxidation of V 2+ to V 3+ by exploring the reaction kinetics. Thereafter, TiB 2 with abundant electron‐deficient sites, which possesses a strong electron‐accepting ability, is demonstrated to improve the rate‐determining step of V 2+ /V 3+ by enhancing the electron transfer from V 2+ to the electrode. The mechanism of TiB 2 for boosting V 2+ /V 3+ kinetics is also unraveled by analyzing the reaction order. VRFB with the electron‐deficient TiB 2 demonstrates a remarkable enhancement in the electrochemical performance, exhibiting an excellent rate performance from 70 to 300 mA cm −2 . The energy efficiency is improved by 14.06% compared to the cell with the pristine electrode at 150 mA cm −2 for 300 cycles. This study is critical for not only proposing the promising electron‐deficient catalyst in VRFB application but also promoting fundamental understanding and offering a design strategy for achieving superior performance electrocatalysts in VRFB.
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