期刊
RENEWABLE ENERGY
卷 189, 期 -, 页码 587-600出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2022.01.105
关键词
Biowaste; Lotus calyx; 3D carbon structure; Aqueous electrolyte; Ionic liquid electrolyte; Symmetric supercapacitor
资金
- National Research Foundation (NRF) of Republic of Korea [NRF-2014R1A6A1031189]
- Regional University's Superior Scientist Research Program [NRF-2020R1I1A3073981]
- Ministry of Education
- Re-of Korea
Three-dimensional lotus calyx-derived activated carbon (3D-LCAC), prepared by one-step carbonization and activation, shows remarkable electrochemical performance and high cycling stability in supercapacitor applications, making it a promising candidate as a high-performance electrode material.
The clean, green, and renewable energy source and its storage have attracted considerable interest from both industry and academia to address the ongoing global climate change. The waste biomass-derived porous carbon is an important research topic complementing its low-cost, eco-friendly, and renewable nature. Three-dimensional (3D) porous carbon was prepared by the one-step simultaneous carbonization and activation of natural lotus (Nelumbo nucifera) calyx. The as-prepared 3D-lotus calyx-derived activated carbon (3D-LCAC) electrode, with a specific surface area of 798 m(2) g(-1) delivered a remarkable specific capacitance of 223 F g(-1) at 1 A g(-1), with exceptionally high cycling stability, showing 97% retention of its initial capacitance, even after 50,000 charge-discharge cycles in a KOH electrolyte. It also demonstrated superior rate capability approximately 3-times higher than the commercial AC. The electrochemical performance of the 3D-LCAC electrode in a symmetric supercapacitor device was measured in aqueous (6 M KOH, 1 M Na2SO4) and ionic liquid (1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide) electrolytes. The ionic liquid electrolyte facilitated 3D-LCAC symmetric supercapacitor device delivered approximately ten-times higher energy density than that of aqueous electrolytes under similar electrochemical conditions. Overall, the 3D-LCAC from renewable and sustainable biowaste is a good candidate for high-performance electrode materials in practical super capacitor applications. (C) 2022 Elsevier Ltd. All rights reserved.
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