摘要
The advancement of high-efficiency Pt catalysts with reduced Pt loading is crucial for proton exchange membrane fuel cells(PEMFCs).This research presents a methodology that significantly increases the performance of Pt/C through the interactions between Pt and Fe–N_(x)/Ce–N_(x)on carbon,thereby effectively reducing Pt consumption.Density functional theory(DFT)calculations indicate that the presence of Fe–N_(x)/Ce–N_(x)together enhances the strong interaction between Pt and FeCe–NC,decreasing the d-band energy level(εd)of Pt,which leads to the reduction of O*adsorption and acceleration of desorption at the Pt sites.Consequently,the Pt/FeCe–NC demonstrates exceptional performance for the ORR.The Pt/FeCe–NC has an E_(1/2)of 0.927 V and decays by only 7 mV after 30000 accelerated stress test(AST)cycles under acidic conditions.Furthermore,the Pt/FeCe–NC(2.14 W cm^(−2))surpasses Pt/C(1.78 W cm^(−2))regarding peak power density in PEMFCs.This innovative approach clarifies the interactions between Pt and Fe–N_(x)/Ce–N_(x),providing a framework for the design of advanced catalysts.
基金
supported by National Natural Science Foundation of China(Grant No.U23A20573,22409041 and 22075062)
Key Research and Development Program of Shandong Province(2022CXGC010305)
Heilongjiang Touyan Team(Grant No.HITTY-20190033)
Natural Science Foundation of Heilongjiang Province of China(LH2024B013)
the Fundamental Research Funds for Central Universities(Grant No.FRFCU5710051922)
Guangdong Basic and Applied Basic Research Foundation(No.2023B1515120022 and 2022B1515120001)
Shenzhen Science and Technology Innovation Program(No.RCBS20231211090522040,KJZD20240903095610014,and KJZD20240903095712017)
High-Level Professional Team in Shenzhen(KQTD20210811090045006).
