Non-stoichiometric tungsten-carbide-oxide-supported Pt–Ru anode catalysts for PEM fuel cells – From basic electrochemistry to fuel cell performance |
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| Affiliation: | 1. University of Belgrade, Vin?a Institute of Nuclear Sciences, Mike Petrovi?a Alasa 12-14, 11001, Vin?a, Serbia;2. Institute of General and Physical Chemistry, Studentski trg 12/V, 11158, Belgrade, 118, Serbia;3. University of Belgrade - Faculty of Physical Chemistry, Studentski trg 12-16, 11158, Belgrad, 118, Serbia;4. Department of Materials Science and Engineering, School of Industrial Engineering and Management, KTH - Royal Institute of Technology, Brinellvägen 23, 100 44, Stockholm, Sweden;5. Environ llc, Cukaricka 9, 11000, Belgrade, Serbia;1. School of Mathematics and Physics, Anhui Jianzhu University, Hefei, 230601, PR China;2. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, P. O. Box 1129, Hefei, 230031, PR China;3. College of Science, Zhongyuan University of Technology, Zhengzhou, 450007, PR China;4. Shchool of Environmental and Energy Engineering, Key Laboratory of Anhui Province of Water Pollution Control and Wastewater Reuse, Anhui Jianzhu University, HeFei, China;1. Department of Mechanical Engineering, Chinese Culture University, No. 55, Hwa-Kang Road, Taipei 11114, Taiwan, ROC;2. Department of Aeronautics and Astronautics, National Cheng Kung University, No.1, Ta-Hsueh Road, Tainan 701, Taiwan, ROC;1. Department of Nanoscience and Nanoengineering, Atatürk University, Erzurum 25240, Turkey;2. Department of Physics, Atatürk University, Erzurum 25240, Turkey;3. Faculty of Engineering &Natural Sciences, Sabanci University, Istanbul 34956, Turkey;4. Sabanci University Nanotechnology Research & Application Center (SUNUM), Istanbul 34956, Turkey;5. Department of Chemical Engineering, Atatürk University, Erzurum 25240, Turkey |
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| Abstract: | Durability and cost of Proton Exchange Membrane fuel cells (PEMFCs) are two major factors delaying their commercialization. Cost is associated with the price of the catalysts, while durability is associated with degradation and poisoning of the catalysts, primarily by CO. This motivated us to develop tungsten-carbide-oxide (WxCyOz) as a new non-carbon based catalyst support for Pt–Ru–based anode PEMFC catalyst. The aim was to improve performance and obtain higher CO tolerance compared to commercial catalysts. The performance of obtained PtRu/WxCyOz catalysts was investigated using cyclic voltammetry, linear scan voltammetry and rotating disk electrode voltammetry. Particular attention was given to the analysis of CO poisoning, to better understand how WxCyOz species can contribute to the CO tolerance of PtRu/WxCyOz. Improved oxidation of COads at low potentials (E < 0.5 V vs. RHE) was ascribed to OH provided by the oxide phase at the interfacial region between the support and the PtRu particles. On the other hand, at high potentials (E > 0.5 V vs. RHE) CO removal proceeds dominantly via OH provided from the oxidized metal sites. The obtained catalyst with the best performance (30% PtRu/WxCyOz) was tested as an anode catalyst in PEM fuel cell. When using synthetic reformate as a fuel in PEMFC, there is a significant power drop of 35.3 % for the commercial 30% PtRu/C catalyst, while for the PtRu/WxCyOz anode catalyst this drop is around 16 %. |
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| Keywords: | Platinum-ruthenium Tungsten-carbide-oxide CO tolerance Anode catalyst PEM fuel Cells |
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