Authors
Liheng Wu, Qing Li, Cheng Hao Wu, Huiyuan Zhu, Adriana Mendoza-Garcia, Bo Shen, Jinghua Guo, Shouheng Sun
Publication date
2015/6/10
Journal
Journal of the American Chemical Society
Volume
137
Issue
22
Pages
7071-7074
Publisher
American Chemical Society
Description
Monodisperse cobalt (Co) nanoparticles (NPs) were synthesized and stabilized against oxidation via reductive annealing at 600 °C. The stable Co NPs are active for catalyzing the oxygen evolution reaction (OER) in 0.1 M KOH, producing a current density of 10 mA/cm2 at an overpotential of 0.39 V (1.62 V vs RHE, no iR-correction). Their catalysis is superior to the commercial Ir catalyst in both activity and stability. These Co NPs are also assembled into a monolayer array on the working electrode, allowing the detailed study of their intrinsic OER activity. The Co NPs in the monolayer array show 15 times higher turnover frequency (2.13 s–1) and mass activity (1949 A/g) than the NPs deposited on conventional carbon black (0.14 s–1 and 126 A/g, respectively) at an overpotential of 0.4 V. These stable Co NPs are a promising new class of noble-metal-free catalyst for water splitting.
Total citations
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Scholar articles
L Wu, Q Li, CH Wu, H Zhu, A Mendoza-Garcia, B Shen… - Journal of the American Chemical Society, 2015