超级电容器
材料科学
电容
异质结
电极
化学工程
电化学
纳米技术
工作(物理)
光电子学
热力学
物理化学
化学
工程类
物理
作者
Huajun Xu,Honglei Dong,Xintong Liu,Qinggang He,Gang Chen,Fei Du,Yohan Dall’Agnese,Yu Gao
标识
DOI:10.1021/acsami.3c13387
摘要
Molybdenum carbide (Mo2CTx MXene) did not possess suitable properties for supercapacitors. Herein, a short oxidation method of Mo2CTx in air at moderately high temperatures is proposed for fabricating a Mo2C/MoO3 heterostructure. The stability of Mo2CTx in air up to 700 °C and the phase transition at higher temperatures are confirmed. Such a heterostructure is beneficial in reducing the diffusion energy barrier of H+. In the aqueous system, the Mo2C/MoO3 electrode delivers a capacitance of up to 811 F g-1. A fully assembled symmetric solid-state supercapacitor delivers 224 F g-1 with an excellent retention rate of 91.05% after 7500 cycles. Besides, the supercapacitor can work at the low temperature of -60°, showing good low-temperature properties. The approach presented in this work opens a promising way to turn a neglected MXene, assumed to be unsuitable for supercapacitors, into one of the top-performing supercapacitor electrodes.
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