氧化还原
电化学
普鲁士蓝
阴极
材料科学
电极
电池(电)
离子
动力学
化学工程
粒子(生态学)
动能
纳米技术
化学
无机化学
化学物理
物理化学
热力学
冶金
有机化学
功率(物理)
物理
量子力学
工程类
海洋学
地质学
作者
Wei Xu,Jia‐Jia Zheng,Li Yuan,Xingfa Gao,Xiaobo Ji,Yi‐Ge Zhou
标识
DOI:10.1002/anie.202306185
摘要
Abstract Prussian blue (PB) has emerged as a promising cathode material in aqueous batteries. It possesses two distinct redox centers, and the potassium ions (K + ) are unevenly distributed throughout the compound, adding complexity to the interpretation of the K + insertion/de‐insertion kinetic mechanism. Traditional ensemble‐averaged measurements are limited in uncovering the precise kinetic information of the PB particles, as the results are influenced by the construction of the porous composite electrode and the redox behavior from different particles. In this study, the electrochemical processes of individual PB particles were investigated using nano‐impact electrochemistry. By varying the potentials, different types of transient current signals were obtained that revealed the kinetic mechanism of each oxidation/reduction reaction in combination with theoretical simulation. Additionally, a partially contradictory conclusion between single‐particle analysis and the ensemble‐averaged measurement was discussed. These findings contribute to a better understanding of the electrochemical processes of cathode materials with multiple redox centers, which facilitates the development of effective strategies to optimize these materials.
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