Enhanced water electrolysis: Electrocatalytic generation of oxygen gas at manganese oxide nanorods modified electrodes |
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| Institution: | 1. School of Environmental Science and Engineering, Sun Yat-sen University, 135 Xingang Xi Road, Guangzhou 510275, China;2. Guangdong Provincial Key Laboratory of Environmental Pollution and Remediation Technology, Guangzhou 510275, China;1. Department of Chemistry, Faculty of Science, Cairo University, Cairo, Egypt;2. Building Physics Institute, Housing and Building Research Center (HBRC), Giza 11511, Egypt;1. State Key Laboratory of Separation Membranes & Membrane Processes, School of Material Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, China;2. Liaoning Key Lab for Energy Materials and Chemical Engineering, State Key Lab of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China;3. School of Environmental & Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, China;1. College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China;2. Department of Chemistry, Taiyuan Normal University, Taiyuan 030031, China |
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| Abstract: | This study is concerned with the electrocatalytic evolution of oxygen gas at manganese oxide nanorods modified Pt, Au and GC electrodes in 0.5 M KOH solution. The electrochemical measurements revealed a significant enhancement of the electrocatalytic activity of the Pt, Au and GC electrodes towards the oxygen evolution reaction (OER) upon the electrodeposition of manganese oxide nanoparticles (nano-MnOx), that is, the onset potentials of the OER at the modified Pt, Au and GC electrodes are more negative by about 300, 550 and 300 mV, respectively, compared with the bare (i.e., unmodified) electrodes. MnOx is electrodeposited in a porous nano-texture structure which covers the entire surface of the substrates homogeneously. The MnOx of a single crystalline manganite phase (γ-MnOOH) plays a vital role as a catalytic mediator, which facilitates the charge transfer during the water oxidation into molecular oxygen and thus the OER is accomplished at less positive potentials. |
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