Fe Stabilization by Intermetallic L1 0 -FePt and Pt Catalysis Enhancement in L1 0 -FePt/Pt Nanoparticles for Efficient Oxygen Reduction Reaction in Fuel Cells

We report in this article a detailed study on how to stabilize a first-row transition metal (M) in an intermetallic L1 -MPt alloy nanoparticle (NP) structure and how to surround the L1 -MPt with an atomic layer of Pt to enhance the electrocatalysis of Pt for oxygen reduction reaction (ORR) in fuel c...

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Published in:Journal of the American Chemical Society 2018-02, Vol.140 (8), p.2926-2932
Main Authors: Li, Junrui, Xi, Zheng, Pan, Yung-Tin, Spendelow, Jacob S, Duchesne, Paul N, Su, Dong, Li, Qing, Yu, Chao, Yin, Zhouyang, Shen, Bo, Kim, Yu Seung, Zhang, Peng, Sun, Shouheng
Format: Article
Language:English
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Summary:We report in this article a detailed study on how to stabilize a first-row transition metal (M) in an intermetallic L1 -MPt alloy nanoparticle (NP) structure and how to surround the L1 -MPt with an atomic layer of Pt to enhance the electrocatalysis of Pt for oxygen reduction reaction (ORR) in fuel cell operation conditions. Using 8 nm FePt NPs as an example, we demonstrate that Fe can be stabilized more efficiently in a core/shell structured L1 -FePt/Pt with a 5 Å Pt shell. The presence of Fe in the alloy core induces the desired compression of the thin Pt shell, especially the two atomic layers of Pt shell, further improving the ORR catalysis. This leads to much enhanced Pt catalysis for ORR in 0.1 M HClO solution (at both room temperature and 60 °C) and in the membrane electrode assembly (MEA) at 80 °C. The L1 -FePt/Pt catalyst has a mass activity of 0.7 A/mg from the half-cell ORR test and shows no obvious mass activity loss after 30 000 potential cycles between 0.6 and 0.95 V at 80 °C in the MEA, meeting the DOE 2020 target (
ISSN:0002-7863
1520-5126
DOI:10.1021/jacs.7b12829