材料科学
电化学
氢氧化物
氧化还原
超级电容器
电极
水平扫描速率
动力学
电导率
无机化学
离子
物理化学
循环伏安法
化学
有机化学
物理
量子力学
冶金
作者
Chao Jin,Su Zhang,Mengjiao Shi,Jing Feng,Zheng Liu,Tong Wei,Zhuangjun Fan
标识
DOI:10.1002/adfm.202109225
摘要
Abstract Metal oxides/hydroxides have attracted great attention as battery‐type electrodes for supercapacitors due to their high theoretical capacitance. However, their poor electrical conductivity and ion transport kinetic severely limit their rate performance, hindering the practical application for high power devices. Herein, a simple co‐precipitation method to synthesize partial substitution of OH – with Cl – in Co, Ni layered hydroxide in saturated NaCl solution is reported. The Cl – substitution significantly increases the interlayer H 2 O content from 5.3% to 10.2% by changing the polarity of the hydroxide layers, leading to ultrafast ion transport through the Grotthuss behavior. Moreover, the Cl – substitution also changes the electron configuration of Ni and Co, enhancing the electrical conductivity and redox activity. Thanks to the robust electrochemical kinetics, the Ni 0.85 Co 0.15 (OH) 1.77 Cl 0.23 shows well‐maintained redox peaks at an ultrahigh scan rate up to 500 mV s –1 and an outstanding rate performance (1076.3 C g –1 at 1 A g –1 and 333.6 C g –1 at 100 A g –1 ), which are among the best in the previously reported Ni(OH) 2 based electrodes. Therefore, this simple anion substitution strategy opens up a new concept for achieving ultrahigh rate battery‐type electrodes.
科研通智能强力驱动
Strongly Powered by AbleSci AI