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Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
Published on: August 7, 2018
Cobalt-Doped Manganese Oxide/Ruthenium Oxide Composite Interface for Acidic Oxygen Evolution Reaction
Tao Yang1, Yu-Qing Wu1, Jia-Yi Chen1
1Tianjin Key Laboratory of Applied Catalysis Science and Technology, Instrument analysis and testing center, School of Chemical Engineering and Technology Tianjin University, Tianjin, P. R. China.
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The oxygen evolution reaction (OER) in acidic media is critical for acidic water electrolysis, electrochemical CO2 reduction, nitrate reduction, etc. However, its harsh corrosive and oxidative environment imposes severe demands on catalysts. Ru-based catalysts offer high activity and low cost, but their poor stability in acidic media remains a key obstacle to practical application. Herein, we report a robust composite catalyst of cobalt-doped manganese oxide ((Co0.08Mn0.92)3O4)-supported RuO2 on a titanium substrate for high activity and stability in acidic media. (Co0.08Mn0.92)3O4 is uniformly immobilized on a titanium substrate via a sol-gel method, followed by a hydrothermal and calcination treatment to uniformly hydrolyze RuCl3 and convert it into RuO2 within the loose and porous (Co0.08Mn0.92)3O4. The Co doping induces the strong electron interaction of Co, Mn, and Ru, creating a highly active RuO2/(Co0.08Mn0.92)3O4 interface. The optimized catalyst requires only 185 mV overpotential to achieve a current density of 10 mA cm-2, with a stability of more than 1000 h at 100 mA cm-2 in 0.5 M H2SO4. In situ Raman spectroscopy experiments confirm that the doping of Co significantly enhances the stability of Mn3O4, while (Co0.08Mn0.92)3O4 suppresses the participation of lattice oxygen and enhances the stability of active Ru species.
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