Nonprecious Hybrid Metal Oxide for Bifunctional Oxygen Electrodes: Endorsing the Role of Interfaces in Electrocatalytic Enhancement

  • Chiranjita Goswami
    Chiranjita Goswami
    Department of Chemical Sciences, Tezpur University, Tezpur, Napaam, Assam 784 028, India
  • Kumar Kashyap Hazarika
    Kumar Kashyap Hazarika
    Department of Chemical Sciences, Tezpur University, Tezpur, Napaam, Assam 784 028, India
  • Yusuke Yamada
    Yusuke Yamada
    Department of Applied Chemistry & Bioengineering, Graduate School of Engineering, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
  • , and 
  • Pankaj Bharali*
    Pankaj Bharali
    Department of Chemical Sciences, Tezpur University, Tezpur, Napaam, Assam 784 028, India
    *Phone: +91 3712 275064. Email: [email protected]. Fax: +91 3712 267005/6.
Cite this: Energy Fuels 2021, 35, 16, 13370–13381
Publication Date (Web):August 10, 2021
https://doi.org/10.1021/acs.energyfuels.1c01388
Copyright © 2021 American Chemical Society
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Abstract

The oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are considered as the core reactions in several alternative energy devices. Engineering the electronic structure of low-cost transition metal oxides (MOs) for the ORR and OER is highly demanding for such devices. Herein, a nonprecious mixed MO hybrid is reported that comprised of nanostructured Co3O4 and CeO2 supported on carbon (Co3O4–CeO2/C) with adequate oxygen vacancies and strong oxide/oxide and oxide/carbon heterointerfaces. The Co3O4–CeO2/C hybrid is highly active toward the ORR with values of the onset potential (−0.12 V) and Tafel slope (69 mV decade–1) comparable to that of benchmark Pt/C with a high limiting current density in alkaline medium. It can catalyze the OER efficiently at a less positive onset potential (0.23 V) and low Tafel slope (176 mV decade–1), in contrast with the standard RuO2 catalyst (0.45 V and 179 mV decade–1). The remarkable activity of the Co3O4–CeO2/C hybrid represents a promising route to replace noble metals and to develop low-cost bifunctional electrodes for energy devices.

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The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.energyfuels.1c01388.

  • Details of the synthesis of (Co3O4+CeO2) + C, characterization techniques, fabrication of the working electrode, electrochemical measurements, additional characterization and experimental data, including Raman spectra, TGA pattern, EDX spectra, and corresponding SEM images, XP spectra, CV plots, LSV curves, and corresponding K–L plots for the ORR, plot of number of electron transfer (n) at –0.6 V, ADT for Pt/C, LSVs of Co3O4–CeO2/C hybrid after 1000 cyles for OER, CVs in N2-saturated electrolyte at different scan rates, tables, and references (PDF)

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