Enrichment of Pyrrolic Nitrogen by Hole Defects in Nitrogen and Sulfur Co-Doped Graphene Hydrogel for Flexible Supercapacitors

The effect of the doping configuration and concentration of nitrogen (N) and sulfur (S) on the electrochemical performance of 3 D N and S co‐doped hole defect graphene hydrogel (NS‐HGH) electrodes is investigated. Surprisingly, by introducing a hole defect on the graphene surface, the difference in...

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Bibliographic Details
Published in:ChemSusChem 2016-08, Vol.9 (16), p.2261-2268
Main Authors: Tran, Ngoc Quang, Kang, Bong Kyun, Woo, Moo Hyun, Yoon, Dae Ho
Format: Article
Language:English
Subjects:
Capacitance
Cobalt - chemistry
doping
Electric Capacitance
Electrochemical analysis
Electrochemistry
Electrodes
Graphene
Graphite - chemistry
hole defect
Hole defects
Hydrogel, Polyethylene Glycol Dimethacrylate - chemistry
Hydrogels
Models, Molecular
Molecular Conformation
Nitrogen
Nitrogen - chemistry
Pyrroles - chemistry
Sulfur
Sulfur - chemistry
supercapacitors
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Summary:The effect of the doping configuration and concentration of nitrogen (N) and sulfur (S) on the electrochemical performance of 3 D N and S co‐doped hole defect graphene hydrogel (NS‐HGH) electrodes is investigated. Surprisingly, by introducing a hole defect on the graphene surface, the difference in the doping concentrations of N and S can be used to effectively modulate the electrochemical behavior of the NS‐HGH. The hole defects provide a rapid ion diffusion path. Finally, we showed that the intriguing specific capacitance (536 F g−1) of the NS‐HGH could enhance the overall performance of the pseudocapacitance and electric double layer capacitance. The rational design of the NS‐HGH‐based flexible solid state supercapacitor results in not only outstanding electrochemical performance with a maximum energy density of 14.8 Wh kg−1 and power density of 5.2 KW kg−1 but also in extraordinary mechanical flexibility and excellent cycle stability. Double dope! A nitrogen and sulfur co‐doped hole defect graphene hydrogel (NS‐HGH) was prepared through a facile solution‐phase synthesis followed by thermal treatment. The NS‐HGH electrodes can enhance the overall performance of the pseudocapacitance and electric double‐layer capacitance as well as exhibit extraordinary mechanical flexibility and excellent cycle stability.
ISSN:1864-5631
1864-564X
DOI:10.1002/cssc.201600668