中国科学院重庆绿色智能技术研究院机构知识库

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	Effects of electrode thickness and crystal water on pseudocapacitive performance of layered birnessite MnO2
	Li, Xu1,2; Xiang, Lu1,2; Xie, Xiong1,2; Zhang, Chunyang2; Liu, Shuangyi2; Li, Zhenhu2; Shen, Jun1
	2020-05-22
摘要	Manganese dioxide (MnO2) nanomaterials with two-dimensional (2D) layered birnessite structures are promising pseudocapacitive electrode materials. However, the effects of structural factors on their electrochemical performance is not fully understood. We synthesize alkali-free crystal water containing 2D layered birnessite MnO2 electrodes with controllable mass loading from 0.1 to 19.3 mg cm(-2) to investigate the effects of electrode thickness and crystal water functions on crystal structure and pseudocapacitive behavior, to promote its industrialization. We find that the crystal water enlarges the interlayer space of birnessite MnO2 with electrolyte ions transported much more easily, resulting in higher specific capacitance of 702 F g(-1) (70.2 mF cm(-2)) and excellent cycling stability of 20 000 charge-discharge cycles even at a mass loading of up to 10.8 mg cm(-2). Such gains in specific capacitance are weakened significantly with raised mass loading. Thus, compared to a carbon cloth substrate, a carbon nanotube film with enhanced electron space transport capability presents better performance, indicating an effective strategy for higher mass loading cases. The present work sheds light on an efficient method for achieving high capacitance and mass loading together, for practical applications.
关键词	birnessite thickness effect crystal water effect supercapacitor
DOI	10.1088/1361-6528/ab73bf
发表期刊	NANOTECHNOLOGY
ISSN	0957-4484
卷号	31期号:21页码:8
通讯作者	Li, Zhenhu(lizhenhu@cigit.ac.cn) ; Shen, Jun(shenjun@cqu.edu.cn)
收录类别	SCI
WOS记录号	WOS:000519974100001
语种	英语