期刊
ACS APPLIED MATERIALS & INTERFACES
卷 14, 期 11, 页码 13250-13260出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c23624
关键词
coal tar pitch; chitosan; microphase separation engineering; porous carbon; supercapacitors
资金
- National Natural Science Foundation of China [51902326, 51672291]
- Youth innovation promotion association CAS [2021174]
- Natural Science Foundation of Shanxi Province for Young Scholars, China [201901D211588]
In this study, a template-free microphase separation strategy was proposed to fabricate 3D porous carbon materials with tunable hierarchical structure for high-performance supercapacitors. The self-assembly of chitosan and coal tar pitch resulted in the formation of hierarchical pores and a network of nanosheets. The assembled supercapacitor exhibited advantages of wide voltage range, high specific capacitance, and energy density.
Although hierarchitectures could energize carbon materials to address the challenges encountered in emerging flexible energy storage, how to make the trade-offs among specific surface area, pore configuration, and conductivity is still a lingering issue. Herein, 3D porous carbon assembled by nanosheets (HCAs) with tunable hierarchical porous structure is acquired from amphiphilic coal tar pitch and chitosan by means of a facile microphase separation strategy without any templates. The polar molecular chains of chitosan and the surrounding pitch molecules with strong pi-pi* bonds self-assemble respectively to form hierarchical pores and a network of nanosheets in a stepped pyrolysis process. Due to the combined effects of the mesodominant porous structure, high specific surface area, and nitrogen-rich nature, the as-assembled symmetric all-solid-state supercapacitor with a wide voltage range of 0-1.8 V delivers a specific capacitance of 296 F g(-1) at 0.2 A g(-1) and an energy density of 27 Wh kg(-1) at a power density of 450 W kg(-1). The strategy of microphase separation is proposed originally to design and to fabricate carbon materials with multilevel nanoarchitectural trade-offs for high-performance supercapacitors.
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