Journal
ELECTROCHIMICA ACTA
Volume 325, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.134941
Keywords
Sword bean shell; Activated carbon; Heteroatoms self-doping; Hydrogen storage; Supercapacitor electrode
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Funding
- National Natural Science Foundation of China [31971593]
- Natural Science Foundation of Fujian Province Department of Science and Technology [2019J01386]
- 2018 forestry science and technology research project by Forestry Department of Fujian Province
- Fujian Agriculture and Forestry University [xjq201420]
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This manuscript describes cost-effective synthesis of heteroatom self-doped activated biocarbons from sword bean shells (ACBS) by a simple two-step process of carbonization and activation using different weight ratios of KOH/chars. The results showing as-prepared samples at different weight ratios present prevailing characteristics with mainly micropores, surface area as high as 2838 m(2)g(-1) and nitrogen content of 1.67 wt%. The specific surface area (S-BET) and micropore volume (V-DR) of the ACBS samples significantly contribute to hydrogen uptake, and at 77 K, these values can reach up to 2.63 and 5.74 wt% at 1 bar and 40 bar, respectively. In addition, the ACBSs exhibit a high specific capacity of 183 Fg(-1) at 2 mV s(-1) and 211 Fg(-1) at 0.5 Ag-1 from CV and GCD analysis in a three-electrode system. The button cell CR 2032 devices assembled by two solid-state symmetric electrodes from ACBSs also present a high energy density of 19.5 W h kg(-1) at 10 Ag-1. These devices also demonstrate superior cycling stability and rate performance with capacitance retention of nearly 100% capacity after 5000 cycles at a current density of 1 A g(-1). These results suggest that the as-prepared nitrogen-doped porous carbon material has a promising potential for energy conversion and storage devices or for hydrogen adsorptions. (C) 2019 Elsevier Ltd. All rights reserved.
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