Effect of carbon nanofiber microstructure on oxygen reduction activity of supported palladium electrocatalyst |
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| Institution: | 1. Liuzhou Vocational Technological, College, Liuzhou 545006, China;2. Academy of Information Technology, Luoyang Normal University, Luoyang 471022, China;3. College of Automation, Guangdong University of Technology, Guangzhou 510006, China;1. Department of Chemistry, SRM Institute of Science and Technology, Kattankulathur, 603203, India;2. Department of Chemistry, Jadavpur University, Kolkata, 700032, India;1. College of Physics and Communication Electronics, Jiangxi Normal University, Nanchang 330022, Jiangxi, China;2. Key Laboratory of Photoelectronics and Telecommunication of Jiangxi Province, Nanchang 330022, Jiangxi, China;3. College of Mathematics and Information Science, Jiangxi Normal University, Nanchang 330022, China |
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| Abstract: | Palladium electrocatalysts supported on carbon nanofibers (CNFs) with controlled microstructure or on activated carbon (AC) are prepared, and the effects of the carbon materials microstructure on the oxygen reduction reaction (ORR) properties of the electrocatalysts are investigated. The physical properties of the CNFs with different microstructure, i.e. platelet CNF (p-CNF) and fish-bone CNF (f-CNF), are characterized by high resolution transmission electron microscope and N2 physisorption. From cyclic voltammetric studies, it is found that Pd/p-CNF and Pd/f-CNF are more active than Pd/AC. The effects of CNF microstructure on the ORR activities of Pd/f-CNF and Pd/p-CNF are discussed. The p-CNF has a higher ratio of edge atoms to basal atoms, and therefore Pd/p-CNF has more positive ORR onset reduction potential and ORR peak potential than Pd/f-CNF. The supports also have influences on the reaction process. The ORR is surface reaction controlled when Pd/AC is used, while it becomes diffusion control when Pd/f-CNF is used. |
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