期刊
CHEMICAL COMMUNICATIONS
卷 54, 期 17, 页码 2150-2153出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7cc09416g
关键词
-
资金
- National Natural Science Foundation of China [21575137]
Co(hydro)oxides show unsatisfactory catalytic activity for the hydrogen evolution reaction (HER) in alkaline media, and it is thus highly desirable but still remains a challenge to design and develop Co(hydro)oxide derived materials as superb hydrogen-evolving catalysts using a facile, rapid and less energy-intensive method. Here, we propose a cathodic electrochemical activation strategy toward greatly boosted HER activity of a Co3O4 nanoarray via room-temperature cathodic polarization in sodium hypophosphite solution. After activation, the overpotential significantly decreases from 260 to 73 mV to drive a geometrical catalytic current density of 10 mA cm(-2) in 1.0 M KOH. Notably, this activated electrode also shows strong long-term electrochemical durability with the retention of its catalytic activity at 100 mA cm(-2) for at least 40 h.
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