期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 14, 页码 12340-12347出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b15461
关键词
nitrogen and sulfur dual-doped graphene; cobalt pentlandite; crumpled architecture; oxygen reduction reaction; oxygen evolution reaction
资金
- Natural Science Foundation of China [21572132, 21372155]
- Shanghai Committee of Science and Technology [16JC1400703]
- MPI-SJTU Partner Group Project (Polymer Chemistry of Graphene Nanoribbons)
A bifunctional electrocatalyst for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is highly attractive for the manufacture of clean energy conversion devices. In this work, highly crumpled hybrid of nitrogen and sulfur dual-doped graphene and quasi-hexagonal Co9S8 nanoplates (Co9S8/NSG(g-C3N4)) is fabricated via a facile ionic assembly approach. The unique structure of Co9S8/NSG(g-C3N4) renders it high specific surface area (288.3 m(2) g(-1)) and large pore volume (1.32 cm(3) g(-1)). As the electrocatalyst for ORR, Co9S8/NSG(g-C3N4) demonstrates excellent performance with the onset potential of -0.02 V vs Ag/AgCl and the limited current density of 6.05 mA cm(-2) at -0.9 V vs Ag/AgCl. Co9S8/NSG(g-C3N4) also presents outstanding catalytic activity toward OER by delivering a limited current density of 48 mA cm(-2) at 1 V vs Ag/AgCl. The bifunctional catalytic behaviors of Co9S8/NSG(g-C3N4) enable the assembly of a rechargeable Znair battery with it as the cathode catalyst, which exhibits stable discharge/charge voltage plateaus upon long time cycling over 50 h.
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