Title: Embedded oxide clusters stabilize sub-2 nm Pt nanoparticles for highly durable fuel cells
Authors: Bosi Peng, Zeyan Liu, Luca Sementa, Qingying Jia, Qiang Sun, Carlo U. Segre, Ershuai Liu, Mingjie Xu, Yu-Han (Joseph) Tsai, Xingxu Yan, Zipeng Zhao, Jin Huang, Xiaoqing Pan, Xiangfeng Duan, Alessandro Fortunelli, Yu Huang
DOI: https://doi.org/10.1038/s41929-024-01180-x
Date: 01/07/2024
Working Group: WG3
Grant Period: 2
Grant Period Goal (number): GPG5
Covered deliverables from the MoU (number): 6
Countries involved: Italy, USA
Number of female/young/ITC coauthors: 4/4/0
Abstract: Platinum (Pt) nanocatalysts are essential for facilitating the cathodic oxygen reduction reaction in proton exchange membrane fuel cells but suffer from a trade-off between activity and durability. Here we present the design of a fine nanocatalyst comprising Pt nanoparticles with sparsely embedded cobalt oxide clusters (CoOx@Pt). This design exploits the strong Pt/oxide interaction, which grants the catalyst its high structural and chemical durability without sacrificing activity. The CoOx@Pt nanocatalyst delivers a high initial mass activity of 1.10 A mgPt−1, a rated power density of 1.04 W cm−2 and a Pt utilization of 10.4 W mgPt−1 in a membrane electrode assembly. It exhibits a notably high durability that features a mass activity retention of 88.2%, a voltage loss of 13.3 mV at 0.8 A cm−2 and a small rated power loss of 7.5% after accelerated stress testing. This durability could offer a long projected lifetime of 15,000 hours and may greatly reduce the lifetime-adjusted cost.
