Uncovering the Effect of Lattice Strain and Oxygen Deficiency on Electrocatalytic Activity of Perovskite Cobaltite Thin Films

Liu, Xi; Zhang, Lei; Zheng, Yun; Guo, Zheng; Zhu, Yunmin; Chen, Huijun; Li, Fei; Liu, Peipei; Yu, Bo; Wang, Xinwei; Liu, Jiang; Chen, Yan; Liu, Meilin

doi:10.1002/advs.201801898

Title: Uncovering the Effect of Lattice Strain and Oxygen Deficiency on Electrocatalytic Activity of Perovskite Cobaltite Thin Films

Journal Article · Wed Jan 30 00:00:00 EST 2019 · Advanced Science

DOI:https://doi.org/10.1002/advs.201801898· OSTI ID:1493070

^[1];

^[2]; Zheng, Yun ^[3]; Guo, Zheng ^[4]; Zhu, Yunmin ^[1]; Chen, Huijun ^[1]; Li, Fei ^[1]; Liu, Peipei ^[1]; Yu, Bo ^[3]; Wang, Xinwei ^[4]; Liu, Jiang ^[1];

^[1];

^[2]

Guangzhou Key Laboratory for Surface Chemistry of Energy MaterialsGuangdong Engineering and Technology and Research Center for Surface Chemistry of Energy MaterialsState Key Laboratory of Pulp and Paper EngineeringSchool of Environment and EnergySouth China University of Technology Guangzhou Guangdong 510006 China
Materials Science and EngineeringGeorgia Institute of Technology Atlanta GA USA
Institute of Nuclear and New Energy TechnologyTsinghua University Beijing China
School of Advanced MaterialsShenzhen Graduate SchoolPeking University Shenzhen China

Developing cost effective electrocatalysts with high oxygen evolution reaction (OER) activity is essential for large-scale application of many electrochemical energy systems. Although the impacts of either lattice strain or oxygen defects on the OER performance of oxide catalysts have been extensively investigated, the effects of both factors are normally treated separately. In this work, the coupled effects of both strain and oxygen deficiency on the electrocatalytic activity of La_0.7Sr_0.3CoO_3-δ (LSC) thin films grown on single crystal substrates (LaAlO3 (LAO) and SrTiO3 (STO)) are investigated. Electrochemical tests show that the OER activities of LSC films are higher under compression than under tension, and are diminished as oxygen vacancies are introduced by vacuum annealing. Both experimental and computational results indicate that the LSC films under tension (e.g., LSC/STO) have larger oxygen deficiency than the films under compression (e.g., LSC/LAO), which attribute to smaller oxygen vacancy formation energy. Such strain-induced excessive oxygen vacancies in the LSC/STO increases the e_g state occupancy and enlarges the energy gap between the O 2p and Co 3d band, resulting in lower OER activity. Understanding the critical role of strain–defect coupling is important for achieving the rational design of highly active and durable catalysts for energy devices.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02‐05CH11231

OSTI ID:: 1493070

Alternate ID(s):: OSTI ID: 1493071; OSTI ID: 1530194

Journal Information:: Advanced Science, Journal Name: Advanced Science Vol. 6 Journal Issue: 6; ISSN 2198-3844

Publisher:: WileyCopyright Statement

Country of Publication:: Germany

Language:: English

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Cited by: 125 works

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