One-step electrochemical strategy for in-situ synthesis of S,N-codoped graphene as metal-free catalyst for oxygen reduction reaction

A simple and economic method was developed for synthesizing efficient S,N-codoped graphene based catalyst for oxygen reduction reaction via a one-step electrochemical exfoliation of graphite rod in melamine and (NH4)2SO4 mixture solution. On one hand, melamine and (NH4)2SO4 co-worked as electrolyte...

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Bibliographic Details
Published in:Carbon (New York) 2018-08, Vol.134, p.316-325
Main Authors: Liu, Fang, Niu, Fushuang, Chen, Tao, Han, Jingrui, Liu, Zhen, Yang, Wenrong, Xu, Yuanhong, Liu, Jingquan
Format: Article
Language:English
Subjects:
Ammonium sulfate
Catalysis
Catalysts
Catalytic activity
Chemical compounds
Chemical synthesis
Electric properties
Electron transfer
Exfoliation
Graphene
Graphite
Interlayers
Melamine
Nanostructure
Nitrogen
Oxygen
Oxygen reduction reactions
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Summary:A simple and economic method was developed for synthesizing efficient S,N-codoped graphene based catalyst for oxygen reduction reaction via a one-step electrochemical exfoliation of graphite rod in melamine and (NH4)2SO4 mixture solution. On one hand, melamine and (NH4)2SO4 co-worked as electrolyte to enhance the exfoliation efficiency of graphite into graphene nanosheets. On the other hand, they also provided nitrogen and sulphur sources for in-situ codoping of the as-prepared graphene. As evidenced, the N and S elements are distributed uniformly throughout the graphene nanosheets which possessed larger interlayer spacing, more lattice disorder and higher defect density. Accordingly, the obtained SNG shows efficient ORR catalytic activity with an onset potential of 0.88 V and a dominant four-electron transfer mechanism (n = 3.98 at 0.5 V), long-time durability and excellent methanol tolerance, which are comparable or superior to those of commercial Pt/C catalysts. [Display omitted]
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2018.04.007