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Dissolution-assistant all-in-one synthesis of N and S dual-doped porous carbon for high-performance supercapacitors

Authors :
Aihua Yuan
Zhiwen Li
Xiaomei He
Linzhi Zhai
Peng Song
Dongyang Zhang
Yiming Sun
Xiaoping Shen
Source :
Advanced Powder Technology. 30:2211-2217
Publication Year :
2019
Publisher :
Elsevier BV, 2019.

Abstract

The rational design and synthesis of porous carbons as supercapacitor electrodes have received tremendous attentions. In this study, a facile all-in-one pyrolysis strategy was developed for producing N and S co-doped porous carbon (NSC), by utilizing cellulose, the most abundant natural reproducible carbohydrate, as precursors. A binary aqueous solution consisting of 9.5% NaOH and 4.5% thiourea served as solvent, porogen and doping reagent, simultaneously. The dissolution and lyophilization procedures allowed a homogeneous mixture, thus achieving a superb activation and doping effects after the pyrolysis. The resultant NSC demonstrated a highly-developed porous texture with a specific surface area of 1588 m2 g−1 and appropriate heteroatom functionalities with N and S contents of 3.82% and 1.94%, respectively. For three-electrode system, NSC had a high specific capacitance of 288 F g−1 at 0.5 A g−1 in 6 M KOH electrolyte, which was comparable to or even better than many reported cellulose and cellulose derivatives based porous carbon electrodes. The as-assembled NSC//NSC symmetrical cell displayed excellent rate capability and durability, depicting a hopeful candidate for supercapacitors.

Details

ISSN :
09218831
Volume :
30
Database :
OpenAIRE
Journal :
Advanced Powder Technology
Accession number :
edsair.doi...........1583909b06bc62edf55eb86677b04de0