Citation: Tuo Zhao, Yang Li, Jie Liu, Xian Wang, Jiayi Zhang, Changpeng Liu, Wei Xing, Junjie Ge. Highly dispersed L1₂-Pt₃Fe intermetallic particles supported on single atom Fe-N_x-C_y active sites for enhanced activity and durability towards oxygen reduction[J]. Chinese Chemical Letters, ;2023, 34(5): 107824. doi: 10.1016/j.cclet.2022.107824 shu

Highly dispersed L1₂-Pt₃Fe intermetallic particles supported on single atom Fe-N_x-C_y active sites for enhanced activity and durability towards oxygen reduction

Tuo Zhao ^{a, b} ,
Yang Li ^{a, b} ,
Jie Liu ^{a, b} ,
Xian Wang ^{a, b} ,
Jiayi Zhang ^c ,
Changpeng Liu ^{a, b} ,
Wei Xing ^{a, b} ,
Junjie Ge ^{a, b, *,}

a.
State Key Laboratory of Electroanalytical Chemistry, Jilin Province Key Laboratory of Low Carbon Chemical Power, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
b.
School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, China
c.
Fuyuan British American School, Shenzhen 518126, China

gejj@ciac.ac.cn

Received Date: 7 June 2022
Revised Date: 22 August 2022
Accepted Date: 12 September 2022
Available Online: 15 September 2022

Figures(4)

Highly active and durable oxygen reduction reaction (ORR) catalysts with sufficient activity and stability of Pt are beneficial for the commercialization of proton exchange membrane fuel cells. Here we report an effective approach to prepare a composite catalyst comprising of ordered L1₂-Pt₃Fe intermetallic nanoparticles interact with single atom Fe-N_x-C_y active sites. The addition of Fe and the confinement effect of hierarchical porous structure limit the growth of intermetallic particle size (around 2.5 nm). The ligand effect of the electron transfer from Fe to Pt and the synergistic interaction between L1₂-Pt₃Fe and Fe-N_x-C_y work together to reduce oxygen intermediates adsorption and improve kinetics process. Experimentally, the L1₂-Pt₃Fe/C_Fe-N-C catalyst shows high mass activity and specific activity at 1.010 A/mg_Pt and 1.166 mA/cm², respectively, which are 5.8 and 5.1 times higher than those of commercial Pt/C (0.174 A/mg_Pt and 0.230 mA/cm²). Thanks to the more stable L1₂ structure, L1₂-Pt₃Fe/C_Fe-N-C exhibits better durability (14 mV E_1/2 loss of L1₂-Pt₃Fe/C_Fe-N-C and 33 mV E_1/2 loss of commercial Pt/C) after 30,000 cycles accelerated stress tests. The strategy to design and prepare small particle Pt-based intermetallic alloys coordinated with M-N-C active sites provides a new direction to obtain low-cost and easily prepared effective ORR catalysts.
- Intermetallic alloys,
- Single atom active sites,
- ORR,
- Synergistic effect,
- Confinement effect
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通讯作者: 陈斌, bchen63@163.com

Highly dispersed L1₂-Pt₃Fe intermetallic particles supported on single atom Fe-N_x-C_y active sites for enhanced activity and durability towards oxygen reduction