Metal-organic-framework-engaged formation of Co nanoparticle-embedded carbon@Co9S8 double-shelled nanocages for efficient oxygen reduction

被引:485
|
作者
Hu, Han [1 ]
Han, Lei [1 ]
Yu, Mengzhou [2 ]
Wang, Zhiyu [2 ]
Lou, Xiong Wen [1 ]
机构
[1] Nanyang Technol Univ, Sch Chem & Biomed Engn, Singapore 637459, Singapore
[2] Dalian Univ Technol, Sch Chem Engn, State Key Lab Fine Chem, Carbon Res Lab, Dalian 116024, Liaoning, Peoples R China
关键词
FREE ELECTROCATALYSTS; HOLLOW STRUCTURES; LITHIUM STORAGE; FREE CATALYSTS; CARBON; GRAPHENE; IRON; CONVERSION; NANOFRAMES; NANOTUBES;
D O I
10.1039/c5ee02903a
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Hollow nanostructures with a complex interior and superb structural tenability offer great advantages for constructing advanced catalysts. Herein, we report the designed synthesis of novel Co nanoparticle-embedded carbon@Co9S8 double-shelled nanocages (Co-C@Co9S8 DSNCs) by a metal-organic-framework-engaged strategy. Uniform zeolitic imidazolate framework (ZIF-67)@amorphous CoS yolk-shelled structures are first fabricated and then converted to Co-C@Co9S8 DSNCs by thermal annealing in N-2 flow. The Co-C nanocages inside Co9S8 shells function as the active centers for the oxygen reduction reaction (ORR). The Co9S8 shells prevent the Co-C active centers from aggregation while acting as nanoreactors. As a result, the Co-C@Co9S8 DSNCs exhibit excellent performance for the ORR in terms of low over-potential, high current density, excellent stability and methanol tolerance capability.
引用
收藏
页码:107 / 111
页数:5
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