Co9S8 Nanoparticles Incorporated in Hierarchically Porous 3D Few-Layer Graphene-Like Carbon with S,N-Doping as Superior Electrocatalyst for Oxygen Reduction Reaction

被引:30
|
作者
Zhu, Chunyu [1 ,2 ,3 ]
Aoki, Yoshitaka [1 ,2 ,3 ]
Habazaki, Hiroki [1 ,2 ,3 ]
机构
[1] Hokkaido Univ, Fac Engn, Div Appl Chem, Sapporo, Hokkaido 0608628, Japan
[2] Hokkaido Univ, Fac Engn, Frontier Chem Ctr, Sapporo, Hokkaido 0608628, Japan
[3] Hokkaido Univ, Grad Sch Chem Sci & Engn, Sapporo, Hokkaido 0608628, Japan
关键词
carbon; cobalt sulfide nanoparticles; combustion synthesis; composites; oxygen reduction reaction; SOLUTION COMBUSTION SYNTHESIS; HIGHLY EFFICIENT ELECTROCATALYST; METAL-ORGANIC FRAMEWORKS; LITHIUM-ION BATTERIES; BIFUNCTIONAL ELECTROCATALYST; HYDROGEN EVOLUTION; SURFACE-AREA; ACTIVE-SITES; HIGH-ENERGY; FUEL-CELLS;
D O I
10.1002/ppsc.201700296
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Electrochemical oxygen reduction reaction (ORR), using nonprecious metal catalysts, has attracted great attention due to the importance in renewable energy technologies, such as fuel cells and metal-air batteries. A simple and scalable synthetic route is demonstrated for the preparation of a novel 3D hybrid nanocatalyst consisting of Co9S8 nanoparticles which are incorporated in N, S-doped carbon (N, S-C) with rational structure design. In particular, the hybrid catalyst is prepared by direct pyrolysis and calcination of a gel mixture of Mg, Co nitrate-thiourea-glycine under Ar atmosphere, with subsequent HCl washing. The properties of obtained hybrid catalyst are quite dependent on calcination temperature and added glycine amount. Under a molar ratio of Co5-Mg15-tu10-gl45 and a calcination temperature of 900 degrees C, Co9S8 nanoparticles are embedded in a well-developed carbon matrix which shows a porous 3D few-layer graphene-like N, S-C with open and hierarchical micro-meso-macro pore structure. Because of the synergistic effect between Co9S8 nanoparticles and well-developed carbon support, the composite exhibits high ORR activity close to that of commercial Pt/C catalyst. More importantly, the composite displays superior long-term stability and good tolerance against methanol. The strategy developed here provides a novel and efficient approach to prepare a cost-effective and highly active ORR electrocatalyst.
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页数:12
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