Journal article
Selective electrocatalysis imparted by metal-insulator transition for durability enhancement of automotive fuel cells
Nature catalysis, v 3(8), pp 639-648
01 Aug 2020
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Repetitive start-up and shut-down events in polymer electrolyte membrane fuel cells for automotive applications lead to serious corrosion of the cathode due to an instantaneous potential jump that results from unintended air leakage into the anodic flow field followed by a parasitic oxygen reduction reaction (ORR) on the anode. Here we report a solution to the cathode corrosion issue during the start-up/shut-down events whereby intelligent catalyst design is used to selectively promote the hydrogen oxidation reaction (HOR) while concomitantly suppressing the ORR on the anode. Platinum thin layers supported on hydrogen tungsten bronze (Pt/HxWO3) suppressed the ORR by converting themselves into an insulator following exposure to oxygen, while selectively promoting the HOR by regaining metallic conductivity following subsequent exposure to hydrogen. The HOR-selective electrocatalysis imparted by a metal-insulator transition in Pt/HxWO3 demonstrated a remarkably enhanced durability of membrane electrode assemblies compared to those with commercial Pt/C catalysts.
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Details
- Title
- Selective electrocatalysis imparted by metal-insulator transition for durability enhancement of automotive fuel cells
- Creators
- Sang-Mun Jung - Pohang University of Science and TechnologySu-Won Yun - Pusan National UniversityJun-Hyuk Kim - Pusan National UniversitySang-Hoon You - Pohang University of Science and TechnologyJinheon Park - Pohang University of Science and TechnologySeonggyu Lee - Korea Advanced Institute of Science and TechnologySeo Hyoung Chang - Chung-Ang UniversitySeung Chul Chae - Seoul National University of EducationSang Hoon Joo - Department of Chemistry Ulsan National Institute of Science and Technology (UNIST) Ulsan Republic of KoreaYousung Jung - Korea Advanced Institute of Science and TechnologyJinwoo Lee - Korea Advanced Institute of Science and TechnologyJunwoo Son - Pohang University of Science and TechnologyJoshua Snyder - Drexel UniversityVojislav Stamenkovic - Argonne National LaboratoryNenad M. Markovic - Argonne National LaboratoryYong-Tae Kim - Pohang University of Science and Technology
- Publication Details
- Nature catalysis, v 3(8), pp 639-648
- Publisher
- Springer Nature
- Number of pages
- 10
- Grant note
- 2019M3D1A1079306; 2019M3E6A1064521 / National Research Foundation (NRF) of Korea; National Research Foundation of Korea
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Web of Science ID
- WOS:000544854100002
- Scopus ID
- 2-s2.0-85087016965
- Other Identifier
- 991019168218704721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Physical