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dc.contributor.authorWang, Maoyuen_US
dc.contributor.authorHan, Binghongen_US
dc.contributor.authorDeng, Junjingen_US
dc.contributor.authorJiang, Yien_US
dc.contributor.authorZhou, Mingyueen_US
dc.contributor.authorLucero, Marcosen_US
dc.contributor.authorWang, Yanen_US
dc.contributor.authorChen, Yuboen_US
dc.contributor.authorYang, Zhenzhenen_US
dc.contributor.authorN'Diaye, Alpha T.en_US
dc.contributor.authorWang, Qingen_US
dc.contributor.authorXu, Jason Zhichuanen_US
dc.contributor.authorFeng, Zhenxingen_US
dc.identifier.citationWang, M., Han, B., Deng, J., Jiang, Y., Zhou, M., Lucero, M., Wang, Y., Chen, Y., Yang, Z., N'Diaye, A. T., Wang, Q., Xu, J. Z. & Feng, Z. (2019). Influence of Fe substitution into LaCoO₃ electrocatalysts on oxygen-reduction activity. ACS Applied Materials and Interfaces, 11(6), 5682-5686.
dc.description.abstractThe development of commercially friendly and stable catalysts for oxygen reduction reaction (ORR) is critical for many energy conversion systems such as fuel cells and metal-air batteries. Many Co-based perovskite oxides such as LaCoO₃ have been discovered as the stable and active ORR catalysts, which can be good candidates to replace platinum (Pt). Although researchers have tried substituting various transition metals into the Co-based perovskite catalysts to improve the ORR performance, the influence of substitution on the ORR mechanism is rarely studied. In this paper, we explore the evolution of ORR mechanism after substituting Fe into LaCoO₃, using the combination of X-ray photoelectron spectroscopy, high-resolution X-ray microscopy, X-ray diffraction, surface-sensitive soft X-ray absorption spectroscopy characterization, and electrochemical tests. We observed enhanced catalytic activities and increased electron transfer numbers during the ORR in Co-rich perovskite, which are attributed to the optimized e g filling numbers and the stronger hybridization of transition metal 3d and oxygen 2p bands. The discoveries in this paper provide deep insights into the ORR catalysis mechanism on metal oxides and new guidelines for the design of Pt-free ORR catalysts.en_US
dc.relation.ispartofACS Applied Materials and Interfacesen_US
dc.rights© 2019 American Chemical Society. All rights reserved.en_US
dc.titleInfluence of Fe substitution into LaCoO₃ electrocatalysts on oxygen-reduction activityen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Materials Science and Engineeringen_US
dc.subject.keywordsOxygen Reduction Reactionen_US
dc.subject.keywordsX-ray Absorption Spectroscopyen_US
dc.description.acknowledgementThis work was financially supported by Callahan Faculty Scholar Endowment and start-up funds from Oregon State University. The hard X-ray microscopy measurements were done at 2-ID-D of Advanced Photon Source, which is a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. The soft X-ray absorption spectroscopy was performed at beamline 6.3.1 of Advanced Light Source, which is an Office of Science User Facility operated for the U.S. DOE Office of Science by Lawrence Berkeley National Laboratory and supported by the DOE under Contract DEAC02-05CH11231. Authors thank Anton Paar USA, Inc. for the BET tests.en_US
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