Anisotropic strain tuning of L10ternary nanoparticles for oxygen reduction

Junrui Li, Shubham Sharma, Kecheng Wei, Zitao Chen, David Morris, Honghong Lin, Cheng Zeng, Miaofang Chi, Zhouyang Yin, Michelle Muzzio, Mengqi Shen, Peng Zhang, Andrew A. Peterson, Shouheng Sun

Research output: Contribution to journalArticlepeer-review

94 Scopus citations

Abstract

Tuning the performance of nanoparticle (NP) catalysts by controlling the NP surface strain has evolved as an important strategy to optimize NP catalysis in many energy conversion reactions. Here, we present our new study on using an eigenforce model to predict and experiments to verify the strain-induced catalysis enhancement of the oxygen reduction reaction (ORR) in the presence of L10-CoMPt NPs (M = Mn, Fe, Ni, Cu, Ni). The eigenforce model allowed us to predict anisotropic (that is, two-dimensional) strain levels on distorted Pt(111) surfaces. Experimentally, by preparing a series of 5 nm L10-CoMPt NPs, we could push the ORR catalytic activity of these NPs toward the optimum region of the theoretical two-dimensional volcano plot predicted for L10-CoMPt. The best ORR catalyst in the alloy NP series we studied is L10-CoNiPt, which has a mass activity of 3.1 A/mgPt and a specific activity of 9.3 mA/cm2 at room temperature with only 15.9% loss of mass activity after 30,000 cycles at 60 °C in 0.1 M HClO4.

Original languageEnglish
Pages (from-to)19209-19216
Number of pages8
JournalJournal of the American Chemical Society
Volume142
Issue number45
DOIs
StatePublished - Nov 11 2020

Funding

The work was supported by the US Department of Energy (DOE), Energy Efficiency and Renewable Energy, Fuel Cell Technologies Office. Los Alamos National Laboratory is operated by Los Alamos National Security, LLC, under contract no. DE-AC52-06NA25396. This research used resources of the Advanced Photon Source, an Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory, and was supported by the US DOE, under contract no. DE-AC02-06CH11357, and the Canadian Light Source and its funding partners. The HAADF-STEM study was conducted at Oak Ridge National Laboratory’s Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility.

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