Optimizing the Electronic Structure of Ordered Pt-Co-Ti Ternary Intermetallic Catalyst to Boost Acidic Oxygen Reduction

作者:Zhao, Weiyue; Chi, Bin; Liang, Lecheng; Yang, Pengfei; Zhang, Wei; Ge, Xin; Wang, Liming; Cui, Zhiming*; Liao, Shijun*
来源:ACS Catalysis, 2022, 7571-7578.
DOI:10.1021/acscatal.2c00554

摘要

Developing advanced electrocatalysts toward the sluggish oxygen reduction reaction (ORR) kinetics is critical to fuel cells but still an enormous challenge at present. Here, we demonstrate a highly active and durable Pt-based ternary catalyst, ordered Pt3Co0.6Ti0.4 intermetallic nanoparticles (similar to 3 nm) supported on ZIF-8-derived mesoporous carbon (Pt3Co0.6Ti0.4/DMC). The Pt3Co0.6Ti0.4/DMC catalyst exhibits faster ORR kinetics compared to Pt3Co/DMC and commercial Pt/C with minimal activity loss (20.1%) and only 5 mV decay in half-wave potential after 20,000 potential cycles. More importantly, its improved performances have also been proven in the H-2/air PEM single cell test. The theoretical calculations reveal that the substitution of Ti for Co induces a strengthened ligand effect and optimizes the surface electronic structure of Pt3Co0.6Ti0.4, resulting in the significantly enhanced ORR activity. This work provides a reliable and promising approach for the development of efficient and robust Pt-based ternary intermetallic electrocatalysts for practical fuel cell applications.

  • 单位
    吉林大学