期刊
NANO ENERGY
卷 70, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2020.104531
关键词
Biomass; Porous carbon; Supercapacitor; Rate performance
类别
资金
- National Science Fund for Distinguished Young Scholars of China [51525204]
- National Natural Science Foundation of China [51702229, U1710256]
Biomass-derived porous carbon materials have attracted considerable attention due to their abundance, low-cost, and rapid regeneration. Here, we report a sheet-like porous carbon prepared by the carbonization and activation of walnut shells for use in high power supercapacitors (SCs), whose pore walls consist of 1-2 carbon layers. This walnut shell based activated carbon (ACWS) has a high specific surface area (SSA) of up to 3577 m(2) g(-1) as well as a much better electrical conductivity (720 S m(-1)) than a typical commercial activated carbon (YP-80F, 93 S m(-1)). As a SC electrode material, the ACWS delivers an ultrahigh capacitance of 330 F g(-1) at a current density of 0.1 A g(-1) and a high capacitance retention of 81% with the current densities increasing from 0.5 to 100 A g(-1) in 6 M KOH, which is far higher than that of YP-80F. This can be attributed to optimum tortuosity for ion transport that is derived from its 2D pore structure. More promising, fully packaged devices based on ACWS achieve ultrahigh power and energy densities of 100 kW kg(-1) and 120 Wh kg(-1) respectively, in an ionic liquid electrolyte. Overall, this method is easily scalable and simple to prepare a biomass-based carbon with a tunable pore structure for ultrahigh-power SCs. We believe that the result reported here is suggestive of promoting the development of electrode materials for industrial SCs and opening new ways to produce high value-added products from abundant bio-waste.
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