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Topotactic transition of α-Co(OH)2 to β-Co(OH)2 anchored on CoO nanoparticles during electrochemical water oxidation: synergistic electrocatalytic effects

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Abstract

Herein, we report a single step, anionic surfactant-assisted, low temperature-hydrothermal synthetic strategy of CoO nanoparticles anchored on β-Co(OH)2 nanosheets which show a low overpotential (295 mV @ 10 mA cm−2) for the oxygen evolution reaction (OER). They also demonstrate much better kinetic parameters compared to the state-of-the-art RuO2. Interestingly, under the OER operational conditions (in alkaline medium), the topotactic transformation of α-Co(OH)2 to a stable Brucite-like β-Co(OH)2 phase leads to a synergistic interaction between the β-Co(OH)2 sheets on the CoO nanoparticles for enhancing the OER electrocatalytic activity.

Graphical abstract: Topotactic transition of α-Co(OH)2 to β-Co(OH)2 anchored on CoO nanoparticles during electrochemical water oxidation: synergistic electrocatalytic effects

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Publication details

The article was received on 03 Aug 2017, accepted on 11 Aug 2017 and first published on 11 Aug 2017


Article type: Communication
DOI: 10.1039/C7CC06086F
Citation: Chem. Commun., 2017, Advance Article
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    Topotactic transition of α-Co(OH)2 to β-Co(OH)2 anchored on CoO nanoparticles during electrochemical water oxidation: synergistic electrocatalytic effects

    S. Kundu, B. Malik, A. Prabhakaran, D. K. Pattanayak and V. K. Pillai, Chem. Commun., 2017, Advance Article , DOI: 10.1039/C7CC06086F

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