Synthesis of intermetallic PtCo fuel cell catalysts from bimetallic core@shell structured nanoparticles  

作　　者：Le Zhang Lei Tong Shuai Li Chang-Song Ma Kun-Ze Xue Hai-Wei Liang 

机构地区：[1]Hefei National Research Center for Physical Sciences at the Microscale,Department of Chemistry,University of Science and Technology of China,Hefei 230026,Anhui,China

出　　处：《Journal of Energy Chemistry》2025年第2期1-6,I0001,共7页能源化学(英文版)

基　　金：the funding support from the National Natural Science Foundation of China(Grants 22325903,22221003,and 22071225);the National Key Research and Development Program of China(Grant 2018YFA0702001);the Plan for Anhui Major Provincial Science&Technology Project(Grants 202203a0520013 and 2021d05050006);the USTC Research Funds of the Double First-Class Initiative(Grant YD2060002032).

摘　　要：The high activity and stability of intermetallic PtCo nanocatalysts toward oxygen reduction reaction make them a top candidate as low-Pt cathode catalysts in proton exchange membrane fuel cells(PEMFCs).However,forming intermetallic structures typically requires high-temperature annealing,posing a challenge for achieving well-size control and highly ordered structures.Here we report the design and synthesis of bimetallic co re@shell structured precursors for affording high-performance intermetallic PtCo catalysts.The fabrication of the core@shell precursor involves using a molecular ligand containing both sulfur and oxygen donors to selectively bind with Pt colloidal nanoparticles as the core and chelate Co ions as the shell.During high-temperature annealing,the ligand transforms into carbon coatings around alloy nanoparticles,preventing particle sintering;meanwhile,Co ions in the shell can easily diffuse into the Pt core,which helps to increase the thermodynamic driving force for forming intermetallic structures.These benefits enable us to obtain the catalyst with finely dispersed nanoparticles(~3.5 nm)and a high ordering degree of 72%.With 0.1 mgPt/cm^(2)cathode loading,the catalyst delivers superior performance and durability in PEMFCs,showing an initial mass activity of 0.56 A/mgPt,an initial power density of 1.05 W/cm^(2)at 0.67 V(H_(2)-air),and a voltage loss of 26 mV at 0.8 A/cm^(2)after the accelerated durability test.

关 键 词：Intermetallic PtCo Oxygen reduction reaction Bimetallic structure Fuel cells 

分 类 号：TM911.4[电气工程—电力电子与电力传动] O643.36[理学—物理化学] TB383.1[理学—化学]