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Template-free synthesis of mesoporous manganese oxides with catalytic activity in the oxygen evolution reaction

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Abstract

Porous manganese carbonate was obtained via solvothermal synthesis using ethanol and urea. The manganese carbonate was subsequently used as a precursor to synthesise mesoporous manganese oxides via thermal treatments at three various temperatures. X-ray diffraction and Extended X-ray Absorption Fine Structure (EXAFS) results shows that γ-MnO2 is synthesised at 380 and 450 °C while Mn2O3 is produced at the annealing temperature of 575 °C. X-ray absorption spectra show that γ-MnO2 converts completely to Mn2O3 after annealing over the 450–575 °C range. The oxides obtained at 380 °C and 450 °C possess extremely high specific surface area, which is of interest for catalytic applications. The oxides were investigated as electrocatalysts for the oxygen evolution reaction; the oxide prepared at the lowest annealing temperature was found to be the optimum catalyst with an overpotential of 427 ± 10 mV at a current density of 10 mA cm−2, normalised by the geometric area. The improved catalytic activity was related to the presence of defect-rich and highly porous manganese dioxide at the lowest annealing temperature.

Graphical abstract: Template-free synthesis of mesoporous manganese oxides with catalytic activity in the oxygen evolution reaction

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Publication details

The article was received on 10 Feb 2017, accepted on 11 Apr 2017 and first published on 12 Apr 2017


Article type: Paper
DOI: 10.1039/C7SE00086C
Citation: Sustainable Energy Fuels, 2017, Advance Article
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    Template-free synthesis of mesoporous manganese oxides with catalytic activity in the oxygen evolution reaction

    S. Lian, M. P. Browne, C. Domínguez, S. N. Stamatin, H. Nolan, G. S. Duesberg, M. E. G. Lyons, E. Fonda and P. E. Colavita, Sustainable Energy Fuels, 2017, Advance Article , DOI: 10.1039/C7SE00086C

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