(A) study on highly durable Pt-Ir catalysts for polymer electrolyte membrane fuel cells = 고분자 전해질 연료전지 내구성 향상을 위한 백금-이리듐 합금 촉매의 제조 및 전기화학적 특성에 관한 연구

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Polymer electrolyte membrane fuel cell (PEMFC) is a promising energy conversion device which could replace conventional power generation system using fossil fuels. The critical issue to overcome for commercialization of fuel cell electric vehicle (FCEV) is stability of Pt/C catalyst at high potential. The corrosion of carbon support at high potential leads detachment platinum nanoparticles from carbon supports and the cell performance decreases. To prevent carbon corrosion, we report highly durable PtIr alloy catalysts for cathode in PEMFC. The PtIr/C catalyst oxidizes water in PEMFC into oxygen, so carbon corrosion is not corroded. We synthesized $Pt_xIr_y/C$ catalysts with various ration of Pt and Ir, and measured oxygen reduction reaction (ORR) activity and oxygen evolution reaction (OER) activity to find the optimal composition of Pt and Ir. We also conducted the accelerated degradation test (ADT) from 1.0 V to 1.5 V to verify the carbon corrosion resistance of catalysts. The ORR activity of the commercial Pt/C decreased from 0.12 $A/mg_{Pt}$ to 0.017 $A/mg_{Pt}$ which is about 86 % of decrease. However, the ORR activity of synthesized $Pt_{85}Ir_{15}/C$ catalyst increased from 0.029 $A/mg_{PGM}$ to 0.071 $A/mg_{PGM}$ which is about 145 % increase after 5,000 durability cycles. In addition, a membrane electrode assembly (MEA) was fabricated to demonstrate the feasibility of commercializing PtIr/C catalyst in practical applications. The $Pt_{85}Ir_{15}/C$ catalyst also showed higher stability than the commercial Pt/C in single-cell system. This results showed that PtIr/C catalysts could be utilized as a catalyst for highly durable FCEVs.
Advisors
Cho, Eun Aeresearcher조은애researcher
Description
한국과학기술원 :신소재공학과,
Publisher
한국과학기술원
Issue Date
2018
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 신소재공학과, 2018.8,[v, 60 p. :]

Keywords

Polymer electrolyte membrane fuel cells▼aoxygen reduction reaction▼acarbon corrosion▼aPt-Ir▼aalloy catalyst▼amembrane electrode assembly; 고분자 전해질 연료전지▼a산소환원반응▼a탄소 열화▼a백금-이리듐▼a합금 촉매▼a막극접합체

URI
http://hdl.handle.net/10203/266519
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=828535&flag=dissertation
Appears in Collection
MS-Theses_Master(석사논문)
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