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Water Oxidation Catalysis: Tuning the Electrocatalytic Properties of Amorphous Lanthanum Cobaltite through Calcium Doping

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Department of Chemistry and Centre for Advanced Solar Materials, University of Calgary, 2500 University Drive Northwest, Calgary, Canada T2N 1N4
School of Chemical Engineering and Technology, Tianjin University, Tianjin, China 300350
§ Departments of Chemistry and Chemical & Biological Engineering, The University of British Columbia, 2026 Main Mall, Vancouver, BC, Canada V6K 1Z6
Cite this: ACS Catal. 2017, 7, 9, 6385–6391
Publication Date (Web):August 7, 2017
https://doi.org/10.1021/acscatal.7b02145
Copyright © 2017 American Chemical Society
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Abstract

The influence of calcium doping on the electrocatalytic activity of amorphous lanthanum cobaltite a-La1–yCayCoOx with respect to the oxygen evolution reaction in 0.1 M KOH is investigated. The introduction of calcium slightly decreases the activity and does not hamper the short-term stability very much. a-La0.7Ca0.3CoOx demonstrates the highest activity among the calcium-containing materials, which is ascribed to the higher concentration of Co3+ and lower film resistance as determined from ex situ X-ray photoelectron spectroscopy and electrochemical impedance spectroscopy.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acscatal.7b02145.

  • IR spectra, SEM images before and after the stability test, XPS results of La 3d and Ca 2p, and OER activity parameters (PDF)

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