超级电容器
电化学
材料科学
电解质
电极
离子
电容
纳米技术
储能
电化学窗口
插层(化学)
功率密度
化学工程
光电子学
无机化学
化学
离子电导率
功率(物理)
物理
物理化学
工程类
量子力学
有机化学
作者
Yupeng Liu,Yaxiong Zhang,Zhenheng Sun,Situo Cheng,Peng Cui,Yin Wu,Junli Zhang,Jiecai Fu,Erqing Xie
出处
期刊:Small
[Wiley]
日期:2020-10-26
卷期号:16 (46)
被引量:16
标识
DOI:10.1002/smll.202003403
摘要
Abstract Multivalent ion hybrid supercapacitors have been developed as the novel electrochemical energy storage systems due to their combined merits of high energy density and high power density. Nevertheless, there are still some challenges due to the limited understanding of the electrochemical behaviors of multivalent ions in the electrode materials, which greatly hinders the large scale applications of its based hybrid supercapacitors. Herein, the long‐term electrochemical behaviors of MnO 2 ‐based electrode in the divalent Mg 2+ ions electrolyte are systematically studied and linked with the morphological and electronic evolution of MnO 2 by cycling at different potential windows (spanning to 1.2 V). It reveals that the different potential windows result in the different electrochemical behaviors, which can be divided into two ranges (below and above −0.2 V). And, the electrode cycled at a potential window of 0–1.2 V delivers the highest capacitance of 967 F g −1 at a scan rate of 10 mV s −1 , in which the MnO 2 is transformed into a uniformly distributed and nonagglomerated nanoflake morphology promoting the intercalation and deintercalation of Mg 2+ ions. This study will enrich the understanding of the charge storage mechanism of multivalent ions and provide significant guidance on the performance improvement of the hybrid supercapacitors.
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