Use of graphene-supported manganite nano-composites for methanol electrooxidation |
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| Affiliation: | 1. Department of Chemistry, Centre of Advanced Study, Faculty of Science, Banaras Hindu University, Varanasi 221005, India;2. Department of Chemical Engineering, Indian Institute of Technology, Banaras Hindu University, Varanasi 221005, India;1. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China;2. Thin Film Centre, Scottish Universities Physics Alliance (SUPA), University of West of Scotland, Paisley PA1 2BE, UK;1. Downstream Technology Division, CRAUN Research Sdn Bhd, 93055 Kuching, Sarawak, Malaysia;2. Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600 Bangi, Malaysia;3. Fuel Cell Institute, Universiti Kebangsaan Malaysia, 43600 Bangi, Malaysia;1. Depto. de Ciencias Ambientales, DICIVA, Universidad de Guanajuato, México;2. Unidad de Ingeniería Avanzada, Centro de Investigación y Estudios Avanzados (CINVESTAV), Av. del Bosque 1145, Zapopan 45019, Jalisco, México;1. Institute of Modern Physics, Northwest University, Xi''an 710069, People''s Republic of China;2. The Key Laboratory of Biomedical Information Engineering of the Ministry of Education, School of Life Science and Technology, Xi''an Jiaotong University, Xi''an 710049, People''s Republic of China;1. Univ. Bordeaux, IMS, UMR 5218, Talence 33400, France;2. Andra, Châtenay-Malabry 92298, France;1. Faculty of Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland;2. Centre of New Technologies, University of Warsaw, Żwirki i Wigury 93, 02-089 Warsaw, Poland |
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| Abstract: | Binary nano-composites of palladium and a metal (Fe or Cu) manganite on graphene nanosheets (GNS) have been prepared by a microwave-assisted polyol reduction method and investigated as electrocatalysts for the methanol oxidation reaction (MOR) in 1 M KOH at 25 °C. Structural and electrocatalytic surface characterizations of composites are carried out by X-ray diffraction, transmission electron microscopy, X-ray photoelectron microscopy, cyclic voltammetry and chronoamperometry. Results show that new composite catalysts, particularly 40 wt%Pd–x wt%FeMn2O4/GNS (where x = 5, 8, 10 & 15) are MOR active and that the activity is the greatest with the catalyst containing 8 wt% of the oxide. The composite, Pd–8 wt%FeMn2O4/GNS, exhibits much superior catalytic activity as well as stability compared to the base (Pd/GNS) electrode. The enhanced catalytic activity and stability of the Pd/GNS catalyst in presence of the oxide can be ascribed to increased population of adsorbed OH− ions/OH radicals at the electrode surface. |
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| Keywords: | Hybrid materials Nano-composites Methanol oxidation Direct methanol fuel cells |
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