Effects of pore widening vs oxygenation on capacitance of activated carbon in aqueous sodium sulfate electrolyte
The commercial activated carbon has a relatively low specific capacitance in the Na2SO4 electrolyte, which hinder the development of asymmetrical supercapacitors with high voltage. Re-activation and oxidative etching methods were applied to change the pore structure of activated carbon, respectively...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Institute of Physics Publishing
2020
|
| Subjects: | |
| Online Access: | https://eprints.nottingham.ac.uk/60534/ |
| _version_ | 1848799774148395008 |
|---|---|
| author | Zhang, Lixing Chi, Yuqin Li, Zhen Sun, Xiaolei Gu, Huazhi Zhang, Haijun Chen, Yao Chen, George Zheng |
| author_facet | Zhang, Lixing Chi, Yuqin Li, Zhen Sun, Xiaolei Gu, Huazhi Zhang, Haijun Chen, Yao Chen, George Zheng |
| author_sort | Zhang, Lixing |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | The commercial activated carbon has a relatively low specific capacitance in the Na2SO4 electrolyte, which hinder the development of asymmetrical supercapacitors with high voltage. Re-activation and oxidative etching methods were applied to change the pore structure of activated carbon, respectively, to study the capacitive behavior of carbon in the Na2SO4 electrolyte. The pore distributions combining with capacitive properties deduce that 0.85 nm is the threshold diameter of the ion-accessible micropores for hydrated Na+ and SO42−. The specific capacitances of both the carbon materials by re-activation and oxidative etching methods are increased by 40 %, in comparison with the commercial activated carbon. The enhanced capacitive performances of the carbon materials were mainly attributed to the increased ion-accessible specific surface area and pseudocapacitance, respectively. The oxidative etching is a more facile and economical method for practice application. Combining with MnO2 as the positive electrode, the asymmetrical supercapacitor with a high voltage of 1.8 V exhibits a maximum specific cell capacitance of 50 F g–1 and specific energy of 22.5 Wh kg–1. |
| first_indexed | 2025-11-14T20:41:00Z |
| format | Article |
| id | nottingham-60534 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T20:41:00Z |
| publishDate | 2020 |
| publisher | Institute of Physics Publishing |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-605342020-05-08T00:49:32Z https://eprints.nottingham.ac.uk/60534/ Effects of pore widening vs oxygenation on capacitance of activated carbon in aqueous sodium sulfate electrolyte Zhang, Lixing Chi, Yuqin Li, Zhen Sun, Xiaolei Gu, Huazhi Zhang, Haijun Chen, Yao Chen, George Zheng The commercial activated carbon has a relatively low specific capacitance in the Na2SO4 electrolyte, which hinder the development of asymmetrical supercapacitors with high voltage. Re-activation and oxidative etching methods were applied to change the pore structure of activated carbon, respectively, to study the capacitive behavior of carbon in the Na2SO4 electrolyte. The pore distributions combining with capacitive properties deduce that 0.85 nm is the threshold diameter of the ion-accessible micropores for hydrated Na+ and SO42−. The specific capacitances of both the carbon materials by re-activation and oxidative etching methods are increased by 40 %, in comparison with the commercial activated carbon. The enhanced capacitive performances of the carbon materials were mainly attributed to the increased ion-accessible specific surface area and pseudocapacitance, respectively. The oxidative etching is a more facile and economical method for practice application. Combining with MnO2 as the positive electrode, the asymmetrical supercapacitor with a high voltage of 1.8 V exhibits a maximum specific cell capacitance of 50 F g–1 and specific energy of 22.5 Wh kg–1. Institute of Physics Publishing 2020-03-04 Article PeerReviewed application/pdf en cc_by https://eprints.nottingham.ac.uk/60534/1/Effects%20of%20Pore%20Widening%20vs%20Oxygenation%20on%20Capacitance%20of%20Activated%20Carbon%20in%20Aqueous%20Sodium%20Sulfate%20Electrolyte.pdf Zhang, Lixing, Chi, Yuqin, Li, Zhen, Sun, Xiaolei, Gu, Huazhi, Zhang, Haijun, Chen, Yao and Chen, George Zheng (2020) Effects of pore widening vs oxygenation on capacitance of activated carbon in aqueous sodium sulfate electrolyte. Journal of The Electrochemical Society, 167 (4). 040524. ISSN 1945-7111 activated carbon; re-activation; oxidative etching; sodium sulfate; asymmetrical supercapacitor http://dx.doi.org/10.1149/1945-7111/ab75c8 doi:10.1149/1945-7111/ab75c8 doi:10.1149/1945-7111/ab75c8 |
| spellingShingle | activated carbon; re-activation; oxidative etching; sodium sulfate; asymmetrical supercapacitor Zhang, Lixing Chi, Yuqin Li, Zhen Sun, Xiaolei Gu, Huazhi Zhang, Haijun Chen, Yao Chen, George Zheng Effects of pore widening vs oxygenation on capacitance of activated carbon in aqueous sodium sulfate electrolyte |
| title | Effects of pore widening vs oxygenation on capacitance of activated carbon in aqueous sodium sulfate electrolyte |
| title_full | Effects of pore widening vs oxygenation on capacitance of activated carbon in aqueous sodium sulfate electrolyte |
| title_fullStr | Effects of pore widening vs oxygenation on capacitance of activated carbon in aqueous sodium sulfate electrolyte |
| title_full_unstemmed | Effects of pore widening vs oxygenation on capacitance of activated carbon in aqueous sodium sulfate electrolyte |
| title_short | Effects of pore widening vs oxygenation on capacitance of activated carbon in aqueous sodium sulfate electrolyte |
| title_sort | effects of pore widening vs oxygenation on capacitance of activated carbon in aqueous sodium sulfate electrolyte |
| topic | activated carbon; re-activation; oxidative etching; sodium sulfate; asymmetrical supercapacitor |
| url | https://eprints.nottingham.ac.uk/60534/ https://eprints.nottingham.ac.uk/60534/ https://eprints.nottingham.ac.uk/60534/ |