Pt/Fe2O3 with Pt–Fe pair sites as a catalyst for oxygen reduction with ultralow Pt loading

Ruijie Gao, Jian Wang, Zhen-Feng Huang, Rongrong Zhang, Wei Wang, Lun Pan (), Junfeng Zhang, Weikang Zhu, Xiangwen Zhang, Chengxiang Shi, Jongwoo Lim () and Ji-Jun Zou ()
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Ruijie Gao: Tianjin University
Jian Wang: Seoul National University
Zhen-Feng Huang: Tianjin University
Rongrong Zhang: Tianjin University
Wei Wang: Tianjin University
Lun Pan: Tianjin University
Junfeng Zhang: Tianjin University
Weikang Zhu: Tianjin University
Xiangwen Zhang: Tianjin University
Chengxiang Shi: Tianjin University
Jongwoo Lim: Seoul National University
Ji-Jun Zou: Tianjin University

Nature Energy, 2021, vol. 6, issue 6, 614-623

Abstract: Abstract Platinum is the archetypal electrocatalyst for oxygen reduction—a key reaction in fuel cells and zinc–air batteries. Although dispersing platinum as single atoms on a support is a promising way to minimize the amount required, catalytic activity and selectivity are often low due to unfavourable O2 adsorption. Here we load platinum onto α-Fe2O3 to construct a highly active and stable catalyst with dispersed Pt–Fe pair sites. We propose that the Pt–Fe pair sites have partially occupied orbitals driven by strong electronic coupling, and can cooperatively adsorb O2 and dissociate the O=O bond, whereas OH* can desorb from the platinum site. In alkaline conditions, the catalyst exhibits onset and half-wave potentials of 1.15 V and 1.05 V (versus the reversible hydrogen electrode), respectively, mass activity of 14.9 A mg−1Pt (at 0.95 V) and negligible activity decay after 50,000 cycles. It also shows better performance than 20% Pt/C in a zinc–air battery and H2–O2 fuel cell in terms of specific energy density and platinum utilization efficiency.

Date: 2021
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DOI: 10.1038/s41560-021-00826-5

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