Carbon nanotube-supported Pt-Alloyed metal anode catalysts for methanol and ethanol oxidation |
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| Affiliation: | 1. Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200 Thailand;2. Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;3. Graduate School, Chiang Mai University, Chiang Mai 50200, Thailand;1. Graduate School, Department of Energy Storage/Conversion Engineering, Hydrogen and Fuel Cell Research Center, Chonbuk National University, Jeollabuk-do 54896, Republic of Korea;2. Department of Bioenvironmental Chemistry and R&D Center for CANUTECH, Business Incubation Center, Chonbuk National University, Jeollabuk–do 54896, Republic of Korea;3. Department of Life Science, Chonbuk National University, Jeollabuk–do 54896, Republic of Korea;1. Laboratory of Advanced Materials and Energy Electrochemistry, Research Institute of Surface Engineering, Taiyuan University of Technology, Yingze West Road 79, Taiyuan 030024, PR China;2. School of Materials Science and Engineering, Shandong University, Jingshi Road 17923, Jinan 250061, PR China;1. School of Materials Science & Engineering, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou, Jiangsu 213164, PR China;2. School of Petrochemical Engineering, Changzhou University, Changzhou, 213164, Jiangsu, China;1. School of Chemistry and Chemical Engineering, Southeast University, Jiangsu Optoelectronic Functional Materials and Engineering Laboratory, Nanjing, 211189, PR China;2. School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing, 211167, Jiangsu Province, China;3. ZYfire Hose Co., Ltd, Taizhou, 225599, Jiangsu Province, PR China |
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| Abstract: | To improve the electrocatalytic activity of alcohol oxidation, functionalized carbon nanotubes (CNTs) decorated with various compositions of metal alloy catalyst nanoparticles (PtxMy, where M = Au and Pd; x and y = 1–3) have been prepared via reduction. The CNTs were treated with an nitric acid solution to promote the oxygen-containing functional groups and further load the metal nanoparticles. X-ray diffraction (XRD) scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to probe the formation of catalyst microstructure morphologies. A uniform dispersion of the spherical metal particles with diameters of 2–6 nm was acquired. The catalytic properties of the catalyst for oxidation were thoroughly studied by electrochemical methods that involved in the cyclic voltammetry (CV), linear sweep voltammetry (LSV), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS). To maximize the electrocatalytic performance and minimize the metal integration of the loaded CNTs, various compositions of active catalysts with large active surface areas are expected to increase the activity of the enhanced catalysts for alcohol oxidation. Most of the prepared bimetallic catalysts have better alcohol oxidation kinetics than commercial PtRu/C. Among the prepared catalysts, the PtAu/CNTs and PtPd/CNTs catalysts with high electrochemically active surface area (ECSA) show excellent activities for alcohol oxidation resulting in their low onset potentials, small charge transfer resistances and high peak current densities and If/Ib ratios, stability, and better tolerance to CO for alcohol oxidation. The integration of Pt and different metal species with different stoichiometric ratios in the CNTs support affects the electrochemical active surface area achieved in the catalytic oxidation reactions. |
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| Keywords: | Pt based alloy Direct alcohol fuel cells Multiwall carbon nanotube Methanol oxidation Ethanol oxidation |
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