期刊
NANO LETTERS
卷 15, 期 11, 页码 7616-7620出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b03446
关键词
Cobalt phosphide; hydrogen evolution reaction; oxygen reduction reaction; electrocatalyst; durability
类别
资金
- National Natural Science Foundation of China [21303249, 81401464, 21425103, 21501192]
- Natural Science Foundation of Jiangsu Province [BK2012007, SBK201341397]
High-performance electrocatalysts with superior stability are critically important for their practical applications in hydrogen evolution reaction (HER) and Oxygen reduction reaction (ORR). Herein, we report a facile method to fabricate urchin like CoP nanocrystals (NCs) as E catalyst for both HER and ORR with desirable electrocatalytic activities and long-term stability. The urchin-like CoP NCs with a diameter of 5 mu m were successfully prepared by a hydrothermal reaction following a phosphidation treatment in N-2 atmosphere and present excellent HER catalytic performance with a low onset overpotential of SO mV) a small Tafel slope of 46 mV/decade, and an exceptional low overpotential of similar to 180 mV at a current density of 100 mA cm(-2) with a mass loading density of 0.28 mg/cm(2). Meanwhile, a remarkable ORR catalytic activity was observed with a half-potential of 0.7 V and an onset potential of 0.8 V at 1600 rpm and a scan rate of 5 mV s(-1). More importantly, the urchin-like CoP NCs present superior stability and keep their catalytic activity for at least 10 000 CV cycles for HER in 0.5 M H2SO4 and over 30 000 s for ORR in 0.1 M KOH, which is ascribed to their robust three-dimensional structure. This urchin-like CoP NCs might be a promising replacement to the Pt-based electrocatalysts in water splitting and fuel cells.
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