期刊
CHEMELECTROCHEM
卷 5, 期 13, 页码 1644-1651出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.201800381
关键词
cobalt phosphide; electrochemistry; hierarchical frameworks; nanoparticles; hydrogen evolution reaction
资金
- DST, New Delhi, India [DST/INSPIRE/04/2015/002259]
- National Research Foundation of Korea [NRF-2015R1D1A1A09060653]
Highly efficient, nonprecious and stable electrocatalysts for the hydrogen evolution reaction (HER) are absolutely crucial for renewable energy conversion, yet the design of such catalysts remains to be a long and arduous task. Herein, cobalt phosphide (CoP) nanoparticles (NPs) embedded in hierarchical N-doped carbon nanotube frameworks (CoP-HNCs) have been synthesized by controlled phosphidation of cobalt NPs embedded in hierarchical N-doped carbon nanotube frameworks (Co-HNCs). The Co-HNCs were prepared by direct carbonization of Co-based zeolitic imidazolate networks (ZIF-67). Benefitting from multiple structural and compositional features, such as a multitude of catalytically active sites, a high degree of graphitization, and a thin carbon layer enclosing the NPs, CoP-HNCs serve as a superior electrocatalyst towards the hydrogen evolution reaction. The synthesized CoP-HNCs delivered a low overpotential at a current density of 10 mA cm(-2) (eta(10)) of 79 mV and 96 mV with small Tafel slope value of 45.6 m Vdec(-1) and 49.5 m Vdec(-1) in acidic and alkaline conditions, respectively. In addition, the catalyst showed long-time durability under both acidic and alkaline electrolyte conditions, further demonstrating their potential to replace Pt-based precious catalysts.
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