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

Sumana Kundu, Bibhudatta Malik, Amrutha Prabhakaran, Deepak K. Pattanayak, Vijayamohanan K. Pillai

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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.

Original languageEnglish
Pages (from-to)9809-9812
Number of pages4
JournalChemical Communications
Volume53
Issue number70
DOIs
StatePublished - 29 Aug 2017
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2017 The Royal Society of Chemistry.

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