期刊
CHEMICAL ENGINEERING JOURNAL
卷 335, 期 -, 页码 590-599出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2017.11.037
关键词
N doped porous carbon; Redox electrolyte; Catalytic electrode; Iodide mediator; Pseudocapacitance
资金
- NSFC [21671059]
- Program for Innovative Research Groups and Individuals in University of Henan Province [18IRTSTHN002, 15HASTIT006]
- 111 Project [D17007]
Nitrogen doped porous carbons (NCs) with high specific surface areas, moderate graphitization degree and high N contents were synthesized by pyrolysis of melamine sponge-polyaniline composite. The as-prepared NCs demonstrate considerable capacitive performances in acidic electrolyte. More importantly, the NCs demonstrated high catalytic activity for the redox reaction of iodides in acidic electrolyte, thus enabled prominent pseudo-capacitance via the faradic reaction of redox electrolyte. Under the optimal concentration of KI in acidic electrolyte, the electrode specific capacitance achieved 616 F g(-1), which is 3 folds higher over that in solely acidic electrolyte. High cycling performance was also maintained for the avoidance of volumetric variation of electrode during charge-discharge cycles. The current work proposed a viable way to ameliorate the capacitive performance via the catalytic NCs electrode-redox iodide electrolyte system.
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