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Carbon-Coated Co3+-Rich Cobalt Selenide Derived from ZIF-67 for Efficient Electrochemical Water Oxidation
- Li, Siwen, Peng, Sijia, Huang, Linsong, Cui, Xiaoqi, Al-Enizi, Abdullah M., Zheng, Gengfeng
- ACS Applied Materials & Interfaces 2016 v.8 no.32 pp. 20534-20539
- active sites, carbon, catalysts, cobalt, electrochemistry, ions, ligands, nanoparticles, oxidation, oxygen production
- Oxygen evolution reaction (OER) electrocatalysts are confronted with challenges such as sluggish kinetics, low conductivity, and instability, restricting the development of water splitting. In this study, we report an efficient Co³⁺-rich cobalt selenide (Co₀.₈₅Se) nanoparticles coated with carbon shell as OER electrocatalyst, which are derived from zeolitic imidazolate framework (ZIF-67) precursor. It is proposed that the organic ligands in the ZIF-67 can effectively enrich and stabilize the Co³⁺ ions in the inorganic–organic frameworks and subsequent carbon-coated nanoparticles. In alkaline media, the catalyst exhibits excellent OER performances, which are attributed to its abundant active sites, high conductivity, and superior kinetics.