Improving the electrochemical performances of active carbon-based supercapacitors through the combination of introducing functional groups and using redox additive electrolyte
High-performance and low-cost electrochemical capacitors (ECs) are essential for large-scale applications in energy storage. In this work, the specific capacitance of active carbon (AC) electrode was significantly improved through the combination of introducing functional groups on the surface of AC...
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doaj-e973902c43e5456f8b28eabd7451cacc2020-11-25T00:47:50ZengElsevierJournal of Saudi Chemical Society1319-61032018-12-01228908918Improving the electrochemical performances of active carbon-based supercapacitors through the combination of introducing functional groups and using redox additive electrolyteMingyuan Zhang0Guoxiang Wang1Lu Lu2Tingyu Wang3Hongfeng Xu4Changshun Yu5Haiting Li6Wenyan Tian7School of Light Industry & Chemical Engineering, Dalian Polytechnic University, 116034 Dalian, ChinaSchool of Light Industry & Chemical Engineering, Dalian Polytechnic University, 116034 Dalian, China; Corresponding author.School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, ChinaDepartment of Materials Science, Chemistry and Chemical Engineering, Soochow University, 215006 Jiangsu, ChinaSchool of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, ChinaSchool of Light Industry & Chemical Engineering, Dalian Polytechnic University, 116034 Dalian, ChinaSchool of Light Industry & Chemical Engineering, Dalian Polytechnic University, 116034 Dalian, ChinaSchool of Light Industry & Chemical Engineering, Dalian Polytechnic University, 116034 Dalian, ChinaHigh-performance and low-cost electrochemical capacitors (ECs) are essential for large-scale applications in energy storage. In this work, the specific capacitance of active carbon (AC) electrode was significantly improved through the combination of introducing functional groups on the surface of AC and adding redox-active molecules (K3Fe(CN)6) into 2 M KOH aqueous electrolytes. The surface-oxygen functionalized AC (FAC) was synthesized using HNO3 echoed as the electrode and 2 M KOH with 0.1 M K3Fe(CN)6 as the electrolyte. The surface functional groups of the AC not only contribute to the pseudocapacitance but also increase the active sites of the electrode/electrolyte interface, which enhances the electrochemical activity of the Fe(CN)63−/Fe(CN)64− redox pair, thus leading to high capacitance. In the redox electrolyte, the specific capacitance was much higher in 229.17 F g−1 (1 A g−1) achieved for those FAC than in raw AC (only 147.06 F g−1). Similarly, the FAC electrode suggested high energy density and extended cycling stability in the KOH + K3Fe(CN)6 electrolyte. Keywords: Active carbon, Functional groups, Redox additive electrolyte, Supercapacitorhttp://www.sciencedirect.com/science/article/pii/S1319610318300188 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Mingyuan Zhang Guoxiang Wang Lu Lu Tingyu Wang Hongfeng Xu Changshun Yu Haiting Li Wenyan Tian |
spellingShingle |
Mingyuan Zhang Guoxiang Wang Lu Lu Tingyu Wang Hongfeng Xu Changshun Yu Haiting Li Wenyan Tian Improving the electrochemical performances of active carbon-based supercapacitors through the combination of introducing functional groups and using redox additive electrolyte Journal of Saudi Chemical Society |
author_facet |
Mingyuan Zhang Guoxiang Wang Lu Lu Tingyu Wang Hongfeng Xu Changshun Yu Haiting Li Wenyan Tian |
author_sort |
Mingyuan Zhang |
title |
Improving the electrochemical performances of active carbon-based supercapacitors through the combination of introducing functional groups and using redox additive electrolyte |
title_short |
Improving the electrochemical performances of active carbon-based supercapacitors through the combination of introducing functional groups and using redox additive electrolyte |
title_full |
Improving the electrochemical performances of active carbon-based supercapacitors through the combination of introducing functional groups and using redox additive electrolyte |
title_fullStr |
Improving the electrochemical performances of active carbon-based supercapacitors through the combination of introducing functional groups and using redox additive electrolyte |
title_full_unstemmed |
Improving the electrochemical performances of active carbon-based supercapacitors through the combination of introducing functional groups and using redox additive electrolyte |
title_sort |
improving the electrochemical performances of active carbon-based supercapacitors through the combination of introducing functional groups and using redox additive electrolyte |
publisher |
Elsevier |
series |
Journal of Saudi Chemical Society |
issn |
1319-6103 |
publishDate |
2018-12-01 |
description |
High-performance and low-cost electrochemical capacitors (ECs) are essential for large-scale applications in energy storage. In this work, the specific capacitance of active carbon (AC) electrode was significantly improved through the combination of introducing functional groups on the surface of AC and adding redox-active molecules (K3Fe(CN)6) into 2 M KOH aqueous electrolytes. The surface-oxygen functionalized AC (FAC) was synthesized using HNO3 echoed as the electrode and 2 M KOH with 0.1 M K3Fe(CN)6 as the electrolyte. The surface functional groups of the AC not only contribute to the pseudocapacitance but also increase the active sites of the electrode/electrolyte interface, which enhances the electrochemical activity of the Fe(CN)63−/Fe(CN)64− redox pair, thus leading to high capacitance. In the redox electrolyte, the specific capacitance was much higher in 229.17 F g−1 (1 A g−1) achieved for those FAC than in raw AC (only 147.06 F g−1). Similarly, the FAC electrode suggested high energy density and extended cycling stability in the KOH + K3Fe(CN)6 electrolyte. Keywords: Active carbon, Functional groups, Redox additive electrolyte, Supercapacitor |
url |
http://www.sciencedirect.com/science/article/pii/S1319610318300188 |
work_keys_str_mv |
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