Durability enhancement of a Pt/C electrocatalyst using silica-coated carbon nanofiber as a corrosion-resistant support |
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| Affiliation: | 1. Fuel Cell Laboratory, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 34129, Republic of Korea;2. Major of Advanced Energy and Technology, University of Science and Technology, 176 Gajeong-dong, Yuseong-gu, Daejeon 34113, South Korea;1. Department of Chemistry, Sungkyunkwan University, Suwon, 16419, South Korea;2. Department of Physics and Graphene Research Institute, Sejong University, Seoul, 05006, South Korea;3. X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 60439, United States;4. School of Material Science Engineering, Tianjin Polytechnic University, Tianjin, 300387, China;5. Department of Physics, Central Michigan University, Mt. Pleasant, MI, 48859, United States;1. Postdoctoral Mobile Station of Mechanical Engineering & School of Automotive Studies, Tongji University, 4800 Cao''an Road, Shanghai, 201804, China;2. School of Automotive Studies & Clean Energy Automotive Engineering Center, Tongji University, 4800 Cao''an Road, Shanghai, 201804, China;1. Fuel Cell Group, Corporate Research & Development Center, Samsung SDI, 150-20 Gongse-ro, Giheung-gu, Yongin-si, Gyeonggi-do 446-577, Republic of Korea;2. Department of Chemical & Biomolecular Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea |
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| Abstract: | Electrochemical oxidation of a carbon support is one of the major challenges to making proton exchange membrane fuel cells (PEMFCs) durable. The aim of this study was to develop a durable carbon-based electrocatalyst support for use in PEMFCs. Platelet-type carbon nanofiber (PCNF) was coated in a uniform and discrete manner with silica by successive hydrolysis of two kinds of silica precursors, APTES and TEOS. The shape and thickness of the silica coating on carbon was controlled by adjusting the amount of APTES and TEOS. The platinum was mainly deposited on silica rather than carbon because the zeta potential of silica is more favorable to binding platinum precursor ions than that of PCNF. Accelerated degradation testing of the silica-coated catalysts (Pt/PCNF SiO2) and Pt/PCNF showed that Pt/PCNFSiO2 possess higher durability than Pt/PCNF under potential cycling. After 30,000 potential cycles ranging from 1.0 V to 1.5 V, the electrochemical surface area losses were 21%, 16%, and 11% and the half-wave potential (E1/2) degradation losses were 16 mV, 9 mV, and 8 mV for Pt/PCNF and Pt/PCNFSiO2 with two different amounts of silica wt%. Silica-coated carbon nanofibers are expected to be a suitable electrocatalyst support for PEMFCs. |
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| Keywords: | Pt/C catalyst Carbon nanofiber Silica coating Silica precursor Durability |
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