title: Highly Crumpled Hybrids of Nitrogen/Sulfur Dual-Doped Graphene and Co9S8Nanoplates as Efficient Bifunctional Oxygen Electrocatalysts.
abstract: 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 Co9S8nanoplates (Co9S8/NSGg-C3N4) is fabricated via a facile ionic assembly approach. The unique structure of Co9S8/NSGg-C3N4renders it high specific surface area (288.3 m2g-1) and large pore volume (1.32 cm3g-1). As the electrocatalyst for ORR, Co9S8/NSGg-C3N4demonstrates excellent performance with the onset potential of -0.02 V vs Ag/AgCl and the limited current density of 6.05 mA cm-2at -0.9 V vs Ag/AgCl. Co9S8/NSGg-C3N4also presents outstanding catalytic activity toward OER by delivering a limited current density of 48 mA cm-2at 1 V vs Ag/AgCl. The bifunctional catalytic behaviors of Co9S8/NSGg-C3N4enable the assembly of a rechargeable Zn-air battery with it as the cathode catalyst, which exhibits stable discharge/charge voltage plateaus upon long time cycling over 50 h.
authors.affiliation: School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai 200240, P.R. China.
authors.forename: Yanping
authors.initials: Y
authors.lastname: Tang
authors.affiliation: School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai 200240, P.R. China.
authors.forename: Fan
authors.initials: F
authors.lastname: Jing
authors.affiliation: School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai 200240, P.R. China.
authors.forename: Zhixiao
authors.initials: Z
authors.lastname: Xu
authors.affiliation: School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai 200240, P.R. China.
authors.forename: Fan
authors.identifier: http://orcid.org/0000-0003-2319-6133
authors.initials: F
authors.lastname: Zhang
authors.affiliation: School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai 200240, P.R. China.
authors.forename: Yiyong
authors.identifier: http://orcid.org/0000-0002-6373-2597
authors.initials: Y
authors.lastname: Mai
authors.affiliation: School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai 200240, P.R. China.
authors.forename: Dongqing
authors.identifier: http://orcid.org/0000-0003-4975-6178
authors.initials: D
authors.lastname: Wu
keywords: cobalt pentlandite; crumpled architecture; nitrogen and sulfur dual-doped graphene; oxygen evolution reaction; oxygen reduction reaction