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A survey of Earth-abundant metal oxides as oxygen evolution electrocatalysts in acidic media (pH o 1)

  • Identification data

    Identifier: imarina:9378580
    Authors:
    Yu JGiancola SKhezri BNieto-Castro DRedondo JSchiller FBarja SSpadaro MCArbiol JGarcés-Pineda FAGalán-Mascarós JR
    Abstract:
    Electrolytic hydrogen appears as one of the most promising options to store renewable energy. In this water splitting process, the sluggish kinetics of the 4-electron oxygen evolution reaction (OER) with its high overpotentials have been widely regarded as the bottleneck to facilitate a fast, energy-efficient process. In alkaline media, numerous earth-abundant metal oxides are efficient OER catalysts, stabilized by the high concentration of hydroxide anions in the electrolyte. However, under acidic conditions, where the hydrogen evolution reaction (HER) is technologically preferred, only noble metal-based oxides (RuO2 and IrO2) are suitable OER catalysts, putting into question the scalability to wide-spread applications due to their scarcity and high cost. Most earth abundant metal oxides dissolve at high proton concentrations. A promising strategy to avoid this drawback consists of incorporating these catalysts into partially hydrophobic composite electrodes. Following this strategy, we have been able to conduct an extensive survey of the activity and stability of mono-, bi- and trimetallic earth-abundant transition metal oxides during the electrocatalytic OER under strongly acidic conditions. Our results confirm the general validity of the strategy by using a hydrophobic electrode to confer high stability to common metal oxides under these harsh conditions. Among all OER catalysts investigated, we found that simple manganese oxides appeared as the most active also exhibiting high, long-term stability. In particular, the stability of Mn2O3 oxide in the OER in acidic media was well confirmed by post-electrolysis characterization data.
  • Others:

    Author, as appears in the article.: Yu J; Giancola S; Khezri B; Nieto-Castro D; Redondo J; Schiller F; Barja S; Spadaro MC; Arbiol J; Garcés-Pineda FA; Galán-Mascarós JR
    Department: Química Física i Inorgànica
    URV's Author/s: Khezri, Bahareh / Yu, Jiahao
    Abstract: Electrolytic hydrogen appears as one of the most promising options to store renewable energy. In this water splitting process, the sluggish kinetics of the 4-electron oxygen evolution reaction (OER) with its high overpotentials have been widely regarded as the bottleneck to facilitate a fast, energy-efficient process. In alkaline media, numerous earth-abundant metal oxides are efficient OER catalysts, stabilized by the high concentration of hydroxide anions in the electrolyte. However, under acidic conditions, where the hydrogen evolution reaction (HER) is technologically preferred, only noble metal-based oxides (RuO2 and IrO2) are suitable OER catalysts, putting into question the scalability to wide-spread applications due to their scarcity and high cost. Most earth abundant metal oxides dissolve at high proton concentrations. A promising strategy to avoid this drawback consists of incorporating these catalysts into partially hydrophobic composite electrodes. Following this strategy, we have been able to conduct an extensive survey of the activity and stability of mono-, bi- and trimetallic earth-abundant transition metal oxides during the electrocatalytic OER under strongly acidic conditions. Our results confirm the general validity of the strategy by using a hydrophobic electrode to confer high stability to common metal oxides under these harsh conditions. Among all OER catalysts investigated, we found that simple manganese oxides appeared as the most active also exhibiting high, long-term stability. In particular, the stability of Mn2O3 oxide in the OER in acidic media was well confirmed by post-electrolysis characterization data.
    Thematic Areas: Catalysis Chemistry (miscellaneous) Electrochemistry Fuel technology Physical and theoretical chemistry Renewable energy, sustainability and the environment
    licence for use: https://creativecommons.org/licenses/by/3.0/es/
    Author's mail: jiahao.yu@estudiants.urv.cat bahareh.khezri@urv.cat
    Author identifier: 0000-0001-7910-4643
    Record's date: 2024-10-19
    Papper version: info:eu-repo/semantics/publishedVersion
    Link to the original source: https://pubs.rsc.org/en/content/articlelanding/2023/ey/d3ey00101f
    Papper original source: Ees Catalysis. 1 (5): 765-773
    APA: Yu J; Giancola S; Khezri B; Nieto-Castro D; Redondo J; Schiller F; Barja S; Spadaro MC; Arbiol J; Garcés-Pineda FA; Galán-Mascarós JR (2023). A survey of Earth-abundant metal oxides as oxygen evolution electrocatalysts in acidic media (pH o 1). Ees Catalysis, 1(5), 765-773. DOI: 10.1039/d3ey00101f
    Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
    Article's DOI: 10.1039/d3ey00101f
    Entity: Universitat Rovira i Virgili
    Journal publication year: 2023
    Publication Type: Journal Publications
  • Keywords:

    Catalysis
    Chemistry (miscellaneous)
    Electrochemistry
    Fuel technology
    Physical and theoretical chemistry
    Renewable energy, sustainability and the environment
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