Comparison of activated carbons prepared by one-step and two-step chemical activation process based on cotton stalk for supercapacitors application

Jie Cheng, Sheng-Chun Hu, Guo-Tao Sun, Kang Kang, Ming-Qiang Zhu and Zeng-Chao Geng

Energy, 2021, vol. 215, issue PB

Abstract: Cotton stalk (CS) was successively treated via one-step and two-step activation process to synthesize activated carbons (ACs), which were utilized for electrode substances in the supercapacitors. The results showed that the activated carbon generated via one-step activation process at 600 °C demonstrate excellent specific surface area (1342.93 m2/g), which accompanied with high proportion of mesopores pore volume (97%) than those from two-step activation process. Moreover, a large specific capacitance of 338 F/g was observed in the AC that generated at the activated temperature of 600 °C via one-step activation process. The biomass-derived ACs presented an overall better electrochemistry characteristic than those from biochar-derived ACs, suggesting that the electrochemical performances of activated carbon generated from biomass-derived were better than those from biochar-derived. The data proved that the as-prepared ACs are promising materials for advanced energy storage, which is beneficial for value-added and industrial supercapacitors application of cotton stalk activated carbons.

Keywords: Cotton stalk; Activated carbon; Supercapacitor; Electrochemistry; Specific capacitance (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (14)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:215:y:2021:i:pb:s0360544220322519

DOI: 10.1016/j.energy.2020.119144

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