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Nitrogen, sulfur and phosphorus tri-doped holey graphene oxide as a novel electrode material for application in supercapacitor

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成果类型:
期刊论文
作者:
JileiLiu;YirongZhu;XianhongChen;WenjieYi
作者机构:
College of Metallurgy and Material Engineering, Hunan University of Technology, Zhuzhou, 412007, China
语种:
中文
关键词:
Holey graphene oxide;N, S, P tri-doping;Electrode materials;Electro-chemistry;Supercapacitors
期刊:
Journal of Alloys and Compounds
ISSN:
0925-8388
年:
2020
卷:
815
期:
Volume 815
页码:
152328-
机构署名:
本校为第一机构
摘要:
Heteroatom doped graphene-based materials have been illustrated to be a superior approach to improve the performance of electrode materials for supercapacitors. In this work, the graphene oxide (GO) was prepared by a modified Hummers’ method employing expanded graphite as precursor, and further etched by hydrothermal method to obtain holey graphene oxide (denoted as HHGO). The resulting HHGO was utilized to synthesize a novel nitrogen(N), sulfur(S) and phosphorus (P) tri-doped holey GO (N, S, P-HHGO) material by a hydrothermal approach utilizing ammonium dihydrogen phosphate and L-cysteine as N, S and P sources and used as supercapacitor electrode materials for the first time. The electrochemical results reveal that the N, S, P-HHGO delivers a high gravimetric capacitance of 295 F g−1 at 1 A g−1 in 2 M KOH aqueous electrolyte, outstanding rate capability with 71.2% of capacity retention rate from 1 to 20 A g−1 and excellent cycling stability with 93.5% of initial capacity retention at 3 A g−1 above 10000 cycles. The outstanding electrochemical properties of N, S, P-HHGO can be attributed to a superior pore-size distribution and the introduction of N, S and P heteroatoms, and shows great potential application in supercapacitors as well as other energy storage devices.

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