Template-free and surfactant free solvothermal synthesis of mesoporous manganese oxide with enhanced activity in the oxygen evolution reaction
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2017Access:
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L. Suoyan, M.P. Browne, C. Dominguez, S. Stamatin, H. Nolan, G. Duesberg, M.E.G. Lyons, E. Fonda, P.E. Colavita, Template-free and surfactant free solvothermal synthesis of mesoporous manganese oxide with enhanced activity in the oxygen evolution reaction, Sustainable energy and Fuels, 2017, 1, 780 - 788Download Item:
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.
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Grant Number
Science Foundation Ireland (SFI)
SFI/12/RC/2302
Science Foundation Ireland (SFI)
13/CDA/2213
Author's Homepage:
http://people.tcd.ie/melyonshttp://people.tcd.ie/colavitp
http://people.tcd.ie/duesberg
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Sustainable energy and Fuels;1;
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Nanoscience & Materials , Hydrogen , OXIDE SURFACESDOI:
http://doi.org/10.1039/c7se00086cMetadata
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