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Sulfur‐Tuned Graphene Networks as Pseudocapacitive Material for High Performance Supercapacitors
Author(s) -
Wang Chaonan,
Yang Yinye,
Luo Shengyun,
Ren Dasen,
Yu Xu
Publication year - 2019
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201800652
Subject(s) - pseudocapacitance , heteroatom , supercapacitor , graphene , capacitance , current density , materials science , sulfur , aerogel , electrochemistry , annealing (glass) , chemical engineering , doping , redox , nanotechnology , chemistry , optoelectronics , electrode , organic chemistry , composite material , metallurgy , ring (chemistry) , physics , quantum mechanics , engineering
The construction of heteroatom sulfur‐doped graphene aerogel (HSG), with an interconnected structure, by a facile ice‐template method, combined with a thermal annealing treatment at 800 °C, is reported. The morphology and chemical nature of HSG are confirmed by several microscopic and spectroscopic analyses. The sulfur‐containing functional groups act as the electro‐active sites for the fast surface redox reaction. The specific capacitance of HSG is reached up to 367 F g −1 at a current density of 1 A g −1 , whereas the specific capacitance of 272 F g −1 is maintained at a current density of 20 A g −1 with a capacitance retention rate of 74.1%. Particularly, the cyclic stability of HSG is close to 92% after 20 000 cycles at a current density of 5 A g −1 . These excellent electrochemical behaviors of HSG can be attributed to the synergistic effects of the hierarchical structure and the formation of additional “pseudocapacitance” by heteroatom doping.