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Issue 32, 2016
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Porous β-MnO2 nanoplates derived from MnCO3 nanoplates as highly efficient electrocatalysts toward oxygen evolution reaction

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Abstract

β-MnO2 has not been considered as an effective catalyst toward the oxygen evolution reaction due to its lack of active di-μ2-oxo bridged Mn centres and inaccessibility to the inner Mn atoms. We have envisioned that β-MnO2 can be made catalytically active by making the inner Mn atoms accessible. In order to accomplish this, we have synthesized MnCO3 nanoplates via a solution route and converted them into highly porous β-MnO2 nanoplates with very high surface area. In addition to the reduced overpotential of 450 mV at 10 mA cm−2, the derived Tafel slope was 78.2 mV dec−1, showing a superior catalytic activity of the porous nanoplate, which is comparable to the catalytic performance of best performing α-MnO2 phase. The importance of surface-bound catalytic Mn sites in highly porous β-MnO2 nanoplates is also demonstrated by Au loading-induced blockage of them and corresponding catalytic activity deterioration.

Graphical abstract: Porous β-MnO2 nanoplates derived from MnCO3 nanoplates as highly efficient electrocatalysts toward oxygen evolution reaction

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Publication details

The article was received on 13 Jan 2016, accepted on 03 Mar 2016 and first published on 03 Mar 2016


Article type: Communication
DOI: 10.1039/C6RA01091A
RSC Adv., 2016,6, 26535-26539

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    Porous β-MnO2 nanoplates derived from MnCO3 nanoplates as highly efficient electrocatalysts toward oxygen evolution reaction

    J. Kim, J. S. Kim, H. Baik, K. Kang and K. Lee, RSC Adv., 2016, 6, 26535
    DOI: 10.1039/C6RA01091A

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