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Active and stable PtP2-based electrocatalysts solve the phosphate poisoning issue of high temperature fuel cells

Title
Active and stable PtP2-based electrocatalysts solve the phosphate poisoning issue of high temperature fuel cells
Author(s)
Yu, Jeong-HoonSingh, Kiran PalKim, Se-JunKang, Tong-HyunLee, Kug-SeungKim, HyungjunRinge, StefanYu, Jong-Sung
Issued Date
2023-03
Citation
Journal of Materials Chemistry A, v.11, no.12, pp.6413 - 6427
Type
Article
Keywords
EFFICIENTNITRIDEPT(111)CONVERSIONOXYGEN REDUCTION REACTIONMETAL PHOSPHIDESPLATINUMCARBONADSORPTIONCATALYSTS
ISSN
2050-7488
Abstract
Platinum (Pt) loaded over a carbon support is known to be the best and most effective electrocatalyst for the oxygen reduction reaction (ORR). However, given its high surface energy, it tends to lose its catalytic activity after an unacceptably short period of usage. The stability of Pt has always been a bottleneck in commercializing the polymer electrolyte membrane fuel cell (PEMFC). In high temperature-polymer electrolyte membrane fuel cells (HT-PEMFCs), the activity loss has been traced back to the chemisorption of phosphate anions, which irreversibly poison Pt active sites. Herein, we present an alternative Pt phosphide-based (PtP2/C) electrocatalyst for application under high temperature conditions. The prepared PtP2/C catalyst shows surprisingly excellent long-term stability and high catalytic activity in phosphoric acid. From density functional theory (DFT) calculations, we found this to be related to the oxyphilicity of the P atoms which under reaction conditions form a protective phosphorus oxide film that also binds phosphoric acid more strongly than Pt sites. Thus-protected Pt sites, in particular those from P defects, are predicted to be highly active for the ORR. The improved stability is also the result of a better oxidation resistance of the carbon support in the presence of PtP2 © 2023 The Royal Society of Chemistry.
URI
http://hdl.handle.net/20.500.11750/46082
DOI
10.1039/d2ta09110k
Publisher
Royal Society of Chemistry
Related Researcher
  • 유종성 Yu, Jong-Sung
  • Research Interests Materials chemistry; nanomaterials; electrochemistry; carbon and porous materials; fuel cell; battery; supercapacitor; sensor and photochemical catalyst
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Appears in Collections:
Department of Energy Science and Engineering Light, Salts and Water Research Group 1. Journal Articles
Department of Energy Science and Engineering Ab initio multi-scale engineering Lab(AIMS-E Lab) 1. Journal Articles

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