Optimizing the ORR performance of PtMnM ternary intermetallics by tuning the surface strain  

作　　者：Min Song Guanyu Luo Qian Zhang Hanyu Hu Deli Wang 

机构地区：[1]Key Laboratory of Material Chemistry for Energy Conversion and Storage,Ministry of Education,School of Chemistry and Chemical Engineering,Huazhong University of Science and Technology(HUST),Wuhan 430074,China

出　　处：《Science China Chemistry》2025年第2期536-542,共7页中国科学(化学英文版)

基　　金：supported by the National Natural Science Foundation of China(22279036);the Innovation and Talent Recruitment Base of New Energy Chemistry and Device(B21003)。

摘　　要：Identifying the descriptors that control catalytic performance is key to design catalysts with high activity and stability.As indirect descriptors related to catalytic activity,modulating the Pt–Pt interatomic distance and d-band center can effectively enhance the ORR activity.It is well recognized that the Pt–Pt interatomic distance is strongly correlated with the surface strain.Herein,PtMnM/C ternary intermetallics are constructed through partially replacing Mn in PtMn/C binary intermetallics with the other transition metal(M=Fe,Co,Ni,and Cu).The 3d-transition metal doping induces surface strain,and the ORR performance of PtMnM/C exhibits volcano relationship relative to both the Pt–Pt interatomic distance and d-band center.The PtMnCo/C with optimum strain exhibits the highest mass activity(1.06 A mgPt^(−1))at 0.9 V,which is 2.6 and 4.6 times higher than that of PtMn/C and commercial Pt/C catalysts,respectively.In addition,PtMnCo/C shows good durability with only 10 mV half-wave potential decay after 50,000 potential cycles.

关 键 词：oxygen reduction reaction ELECTROCATALYSTS ternary intermetallics surface strain electronic structure 

分 类 号：O64[理学—物理化学]