Low Overpotential and Stable Electrocatalytic Oxygen Evolution Reaction Utilizing Doped Perovskite Oxide, La0.7Sr0.3MnO3, Modified by Cobalt Phosphate

  • Sourav Bhowmick
    Sourav Bhowmick
    Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
  • Ankit Dhankhar
    Ankit Dhankhar
    Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
  • Tushar Kanta Sahu
    Tushar Kanta Sahu
    Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
  • Rohan Jena
    Rohan Jena
    Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
    More by Rohan Jena
  • Devipriya Gogoi
    Devipriya Gogoi
    Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
  • Nageswara R. Peela
    Nageswara R. Peela
    Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
  • Shane Ardo
    Shane Ardo
    Department of Chemistry, Department of Materials Science & Engineering, and Department of Chemical & Biomolecular Engineering, University of California, Irvine, Irvine, California 92697, United States
    More by Shane Ardo
  • , and 
  • Mohammad Qureshi*
    Mohammad Qureshi
    Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
    *Email: [email protected]. Fax +91-361-2582349. Phone: +91-361-2582320.
Cite this: ACS Appl. Energy Mater. 2020, 3, 2, 1279–1285
Publication Date (Web):January 23, 2020
https://doi.org/10.1021/acsaem.9b02167
Copyright © 2020 American Chemical Society
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Abstract

A low overpotential of 220 mV at 10 mA cm–2 comparable to the benchmark RuO2 catalyst with a Tafel slope of 62 mV per decade having a turnover frequency of 3.17 s–1 is attained for strontium-doped lanthanum manganite (La0.7Sr0.3MnO3) coupled with cobalt phosphate (Co-Pi) for the oxygen evolution reaction (OER). Impedence spectroscopic analysis of La0.7Sr0.3MnO3/Co-Pi suggests a favorable charge-transfer resistance results in efficient charge carrier extraction. A Faradaic yield close to unity (98%) for the OER suggests that the oxygen evolved during the reaction is solely from the water oxidation.

Supporting Information

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The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acsaem.9b02167.

  • X-ray diffraction patterns of the synthesized perovskites, STEM-EDX images of La0.7Sr0.3MnO3/Co-Pi and the HRTEM image, FESEM images of the material, XPS spectra of lanthanum and strontium along with the survey spectra of the electrocatalysts, LSV curves of the different doped lanthanum manganites and that for the optimization of Co-Pi thickness, CV plots of La0.7Sr0.3MnO3 and La0.7Sr0.3MnO3/Co-Pi along with the stability curve, and TOF calculation details (PDF)

  • Demonstration of reaction utilizing doped perovskite oxide (MP4)

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