Le, Thanh Duc Ahemad, Mohammad Jamir Kim, Dong-Seog Lee, Byeong-Hyeon Oh, Geun-Jae Shin, Gi-Seung Nagappagari, Lakshmana Reddy Dao, Vandung Tran, Tuong Van Yu, Yeon-Tae 2024-01-19T10:02:43Z 2024-01-19T10:02:43Z 2023-02-03 2023-03 0021-9797 https://pubs.kist.re.kr/handle/201004/113973 Pt-Ni (111) alloy nanoparticles (NPs) and atomically dispersed Pt have been shown to be the most effec-tive catalysts for oxygen reduction reaction (ORR) in polymer electrolyte membrane fuel cells (PEMFCs) as well as less expensive compared to pure Pt NPs. To meet reaction kinetic demands and minimize the Pt utilization at cathode in PEMFCs, we propose a novel electrocatalyst composed of dual single-atoms (Pt, Ni) and Pt-Ni alloy NPs dispersed on the surface of N-doped carbon (NDC); collectively, PtNiSA-NPS-NDC. The optimized PtNiSA-NPS-NDC catalyst displays excellent mass activity and durability compared to com-mercial Pt/C. Electrocatalytic measurements show that the PtNiSA-NPS-NDC catalyst, with a metal loading of 4.5 wt%, exhibited distinguished ORR performance (E1/2 = 0.912 V) through a 4-electron (4e-) pathway, which is higher than that of commercial 20 wt% Pt/C (E1/2 = 0.857 V). The DFT simulations indicate Pt-Ni alloy NPs and PtNiN2C4 atomic structure are the mobile active sites for ORR catalytic activity in PtNiSA-NPS-NDC. As a cathode catalyst in PEMFC, the Pt utilization efficiency in the PtNiSA-NPS-NDC catalyst is 0.033 gPt kW-1, which is 5.6 times higher than that of commercial Pt/C (0.185gPt kW-1). Therefore, the consumption of precious metals is effectively minimized.(c) 2022 Published by Elsevier Inc. English Academic Press Synergistic effect of Pt-Ni dual single-atoms and alloy nanoparticles as a high-efficiency electrocatalyst to minimize Pt utilization at cathode in polymer electrolyte membrane fuel cells Article 10.1016/j.jcis.2022.12.061 1 Journal of Colloid and Interface Science, v.634, pp.930 - 939 Journal of Colloid and Interface Science 634 930 939 N scie scopus 000912353600001 2-s2.0-85144605659 Chemistry, Physical Chemistry Article OXYGEN REDUCTION ACTIVITY TRANSITION-METAL DOPED GRAPHENE CO OXIDATION CATALYSTS PERFORMANCE DURABILITY EVOLUTION ALKALINE SITES Single atoms Alloy nanoparticles Oxygen reduction reaction Electrocatalyst Fuel cell