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Joo, Sang Hoon
Nanomaterials & Catalysis Lab
Research Interests
  • Catalyst, energy conversion, fuel cells, electrolyzer, ORR, HER, OER

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Selective electrocatalysis imparted by metal-insulator transition for durability enhancement of automotive fuel cells

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Title
Selective electrocatalysis imparted by metal-insulator transition for durability enhancement of automotive fuel cells
Author
Jung, Sang-MunYun, Su-WonKim, Jun-HyukYou, Sang-HoonPark, JinheonLee, SeonggyuChang, Seo HyoungChae, Seung ChulJoo, Sang HoonJung, YousungLee, JinwooSon, JunwooSnyder, JoshuaStamenkovic, VojislavMarkovic, Nenad M.Kim, Yong-Tae
Issue Date
2020-08
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE CATALYSIS, v.3, no.8, pp.639 - 648
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.
URI
https://scholarworks.unist.ac.kr/handle/201301/36819
URL
https://www.nature.com/articles/s41929-020-0475-4
DOI
10.1038/s41929-020-0475-4
ISSN
2520-1158
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