期刊
NANO LETTERS
卷 17, 期 1, 页码 578-583出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b04732
关键词
Metallic precatalysts; electrochemical activation; generic strategy; enhanced neutral OER activity
类别
资金
- National Basic Research Program of China [2015CB932302]
- Natural Science Foundation of China [U1432133, 21331005, 21601172, U1532265, J1030412]
- National Program for Support of Topnotch Young Professionals, Chinese Academy of Science [XDB01020300]
- China Postdoctoral Science Foundation [2015M580539, 2016T90571]
- Fundamental Research Funds for the Central Universities [WK2060190027, WK2060190061]
In this study, by using dicobalt phosphide nanoparticles as precatalysts, we demonstrated that electrochemical activation of metallic precatalysts in alkaline media (comparing with directly electrochemical activation in neutral media) could significantly promote the OER catalysis in neutral media, specifically realizing a 2-fold enhanced activity and meanwhile showing a greatly decreased overpotential of about 100 mV at 10 mA cm(-2). Compared directly with electrochemical activation in neutral media, the electrochemical activation in harsh alkaline media could easily break the strong Co-Co bond and promote active species generation on the surface of metallic Co2P, thus accounting for the enhancement of neutral OER activity, which is also evidenced by HRTEM and the electrochemical double-layer capacitance measurement. The activation of electrochemical oxidation of metallic precatalysts in alkaline media enhanced neutral OER catalysis could also be observed on CoP nanoparticles and Ni2P nanoparticles, suggesting this is a generic strategy. Our work highlights that the activation of electrochemical oxidation of metallic precatalysts in alkaline media would pave new avenues for the design of advanced neutral OER electrocatalysts.
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