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제125회 대한화학회 학술발표회 및 총회 Investigation on Methanol Tolerance of Pt Catalyst with Heteroatom-doped Carbon Layer for DMFC

2020년 2월 14일 15시 18분 09초
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Environmental Energy
저자 및
Jung-goo Choi, Kahyun Ham, Jaeyoung Lee*
School of Earth Sciences and Environmental Eng., Gwangju Institute of Science and Technology, Korea
Direct methanol fuel cell (DMFC) is one of the most commercialized technology in direct liquid fuel cells due to various advantages of rapid refueling and high energy density, which are crucial characteristics for portable applications. DMFC consists of methanol oxidation reaction at anode and oxygen reduction reaction (ORR) at cathode on PtRu-based and Pt-based catalyst, respectively. However, Pt has also catalytic activity toward methanol oxidation, and it causes voltage loss by methanol oxidation reaction at the cathode by permeated methanol through membrane crossover. Thus, it is crucial to design a methanol-tolerant Pt-based catalyst to increase the ORR selectivity at the cathode. In this study, we synthesized Pt/C covered by heteroatom-doped carbon layer. The Pt catalyst showed both lower activity in the methanol oxidation reaction and higher activity in ORR than pristine Pt/C. The origin of selectivity will be investigated with electrochemical tests such as CO stripping voltammetry and XPS in aspects of oxophilicity and Pt electronic structure. Finally, we will apply Pt/C covered by a heteroatom-doped carbon layer on the cathode and confirm selectivity compared with pristine Pt/C. This approach suggests the way to design a Pt catalyst for ORR to improve performance in DMFC.