Lee, Sehyun Jang, Jue-Hyuk Jang, Injoon Choi, Daeil Lee, Kug-Seung Ahn, Docheon Kang, Yun Sik Park, Hee-Young Yoo, Sung Jong 2024-01-19T19:01:09Z 2024-01-19T19:01:09Z 2021-09-05 2019-11 0021-9517 https://pubs.kist.re.kr/handle/201004/119386 Platinum alloys with other transition metals are widely used as catalysts as a promising strategy to improve the activity. However, the vulnerability of transition metals to the liquid electrolyte and fuel gases present during the device operation results in degradation of the catalytic activity. Highly stable catalyst is achieved by encapsulating the carbon-supported PtCo intermetallic core nanoparticles in a robust Pt shell. The hydride from Hantzsch ester reduces the residual Cl on the surface of the Pt skeleton and slowly forms negatively charged defect sites without damaging the core structure. Then, a secondary Pt reduction reaction via the hydride is employed to cover the activated surfaces of the Pt skeleton to optimize the shell thickness without the formation of isolated Pt nanoparticles. The PtCo@Pt with the unique Pt shell shows higher catalytic activity and durability than commercial Pt/C for oxygen reduction reaction electrocatalysts in proton exchange membrane fuel cells. (C) 2019 Elsevier Inc. All rights reserved. English ACADEMIC PRESS INC ELSEVIER SCIENCE OXYGEN REDUCTION REACTION METAL NANOCRYSTALS CATHODE CATALYSTS ENHANCED ACTIVITY HIGH-PERFORMANCE STABILITY PLATINUM SKIN NANOPARTICLES DEPOSITION Development of robust Pt shell through organic hydride donor in PtCo@Pt core-shell electrocatalysts for highly stable proton exchange membrane fuel cells Article 10.1016/j.jcat.2019.09.020 1 JOURNAL OF CATALYSIS, v.379, pp.112 - 120 JOURNAL OF CATALYSIS 379 112 120 scie scopus 000497249700012 2-s2.0-85072801503 Chemistry, Physical Engineering, Chemical Chemistry Engineering Article OXYGEN REDUCTION REACTION METAL NANOCRYSTALS CATHODE CATALYSTS ENHANCED ACTIVITY HIGH-PERFORMANCE STABILITY PLATINUM SKIN NANOPARTICLES DEPOSITION Fuel cell Electrocatalysts Oxygen reduction reaction Pt-Co metal alloy Core-shell Hydride donor Hantzsch ester