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Water Oxidation Catalyzed by Cobalt(II) Adsorbed on Silica Nanoparticles

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journal contribution
posted on 05.09.2012, 00:00 by Tomer Zidki, Lihua Zhang, Vladimir Shafirovich, Sergei V. Lymar
A novel, highly efficient, and stable water oxidation catalyst was prepared by a pH-controlled adsorption of Co­(II) on ∼10 nm diameter silica nanoparticles. A lower limit of ∼300 s–1 per cobalt atom for the catalyst turnover frequency in oxygen evolution was estimated, which attests to a very high catalytic activity. Electron microscopy revealed that cobalt is adsorbed on the SiO2 nanoparticle surfaces as small (1–2 nm) clusters of Co­(OH)2. This catalyst is optically transparent over the entire UV–vis range and is thus suitable for mechanistic investigations by time-resolved spectroscopic techniques.