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

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Title
Porous β-MnO2 nanoplates derived from MnCO3 nanoplates as highly efficient electrocatalysts toward oxygen evolution reaction
Author(s)
Jun Kim; Ju Seong Kim; Hionsuck Baik; Kisuk Kang; Kwangyeol Lee
Publication Date
2016-03
Journal
RSC ADVANCES, v.6, no.32, pp.26535 - 26539
Publisher
ROYAL SOC CHEMISTRY
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. © 2016 The Royal Society of Chemistry
URI
https://pr.ibs.re.kr/handle/8788114/2588
ISSN
2046-2069
Appears in Collections:
Center for Molecular Spectroscopy and Dynamics(분자 분광학 및 동력학 연구단) > Journal Papers (저널논문)
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