MXenes公司
电化学
超级电容器
电解质
材料科学
电极
氮化物
水溶液
碳化物
无机化学
过渡金属
电化学窗口
化学工程
化学
纳米技术
图层(电子)
物理化学
冶金
离子电导率
有机化学
催化作用
工程类
作者
Kosuke Kawai,Masaki Fujita,Ryosei Iizuka,Atsuo Yamada,Masashi Okubo
出处
期刊:2D materials
[IOP Publishing]
日期:2022-11-10
卷期号:10 (1): 014012-014012
被引量:11
标识
DOI:10.1088/2053-1583/aca1cf
摘要
Abstract Two-dimensional transition-metal carbides/nitrides (MXenes) have been intensively investigated as electrode materials for electrochemical energy storage devices, such as batteries and supercapacitors, due to their high capacitance, high-rate capability, and good cycle stability. Although MXenes possess various surface termination groups (e.g., –O, –OH, –F, –Cl, and –Br) that directly interact with adsorbed cations to exhibit charge transfer, the influence of each surface termination group on the electrochemical properties of MXene remains elusive because of difficulty in achieving exclusively modified termination. Herein, we report the electrochemical properties of MXenes with surface termination groups controlled by using fluorine-based aqueous solutions and molten salts as etchants. In aqueous electrolytes, Ti 3 C 2 Cl x and Ti 3 C 2 Br x synthesized using molten salts show no electrochemical activity in contrast to Ti 3 C 2 T x (T = O, OH, F, and Cl). Meanwhile, in a nonaqueous electrolyte, Ti 3 C 2 Cl x and Ti 3 C 2 Br x undergo amorphization upon the initial lithiation. These results suggest that the –O, –OH, and –F terminations play an important role in the electrochemical properties of MXene electrodes.
科研通智能强力驱动
Strongly Powered by AbleSci AI