期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 826, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.154208
关键词
Porous carbon; Hierarchical pore; N-doping; Oxygen reduction reaction; Supercapacitor
资金
- Natural Science Foundation of China [51968049]
- Youth Science Foundation of Jiangxi Province, China [20192ACB21031]
- Young Talents Training Plan for Scientific and Technological Innovation of Jiangxi Province, China [20192BCB23012]
Development of an efficient electrode material with robust porous architecture, high catalytic activity and excellent electrochemical performance toward both oxygen reduction reaction (ORR) and super-capacitor is extremely important. Herein, a facile route to fabricate nitrogen-doped hierarchical porous carbon (NHPC) materials as a bifunctional electrode material for ORR and supercapacitors is presented. The as-prepared NHPC-0.5 integrate the feature of high-level nitrogen-doping (12.1 at %), large specific surface area (up to 1798.4 m(2) g(-1)) and hierarchical multi-pores of cross-linked micro and mesoporous channels. When used as ORR electrocatalyst, the NHPC-0.5 demonstrated highest selectivity (four-electron transfer process), high activity (half-wave potential 0.883 V vs. RHE, initial potential 1.004 V vs. RHE) and favorable tolerance against methanol. When tested its application in zinc-air batteries, its maximum output power density was 25.1 mW cm(-2), and delivers a superior durability of negligible potential loss after 100 cycles. When applied in supercapacitor, the NHPC-0.5 can deliver a high specific capacitance of 283.7 F g(-1) at current density of 1 A g(-1) in 1 M H2SO4 electrolyte, and outstanding cyclic stability (105.8% capacitance retention after 40,000 cycles). Moreover, a symmetric supercapacitor (NHPC-0.5//NHPC-0.5) can release an energy density of 11.3 W h kg(-1) at the power density of 502 W kg(-1). The encouraging results of this work may provide a new perspective to construct N-doped hierarchical porous carbon materials in energy storage devices with excellent electrochemical performance. (C) 2020 Elsevier B.V. All rights reserved.
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