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Active and durable R2MnRuO7 pyrochlores with low Ru content for acidic oxygen evolution

Author

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  • Dmitry Galyamin

    (Grupo de Energía y Química Sostenibles, Instituto de Catálisis y Petroleoquímica, CSIC. C/Marie Curie 2)

  • Jorge Torrero

    (German Aerospace Center (DLR))

  • Isabel Rodríguez

    (Grupo de Energía y Química Sostenibles, Instituto de Catálisis y Petroleoquímica, CSIC. C/Marie Curie 2)

  • Manuel J. Kolb

    (Universitat de Barcelona)

  • Pilar Ferrer

    (Harwell Science and Innovation Campus)

  • Laura Pascual

    (Instituto de Catálisis y Petroleoquímica, CSIC. C/Marie Curie 2)

  • Mohamed Abdel Salam

    (King Abdulaziz University)

  • Diego Gianolio

    (Harwell Science and Innovation Campus)

  • Verónica Celorrio

    (Harwell Science and Innovation Campus)

  • Mohamed Mokhtar

    (King Abdulaziz University)

  • Daniel Garcia Sanchez

    (German Aerospace Center (DLR))

  • Aldo Saul Gago

    (German Aerospace Center (DLR))

  • Kaspar Andreas Friedrich

    (German Aerospace Center (DLR))

  • Miguel A. Peña

    (Grupo de Energía y Química Sostenibles, Instituto de Catálisis y Petroleoquímica, CSIC. C/Marie Curie 2)

  • José Antonio Alonso

    (Instituto de Ciencia de Materiales de Madrid, CSIC. C/Sor Juana Inés de la Cruz 3)

  • Federico Calle-Vallejo

    (Universitat de Barcelona
    University of the Basque Country UPV/EHU
    IKERBASQUE, Basque Foundation for Science)

  • María Retuerto

    (Grupo de Energía y Química Sostenibles, Instituto de Catálisis y Petroleoquímica, CSIC. C/Marie Curie 2)

  • Sergio Rojas

    (Grupo de Energía y Química Sostenibles, Instituto de Catálisis y Petroleoquímica, CSIC. C/Marie Curie 2)

Abstract

The production of green hydrogen in water electrolyzers is limited by the oxygen evolution reaction (OER). State-of-the-art electrocatalysts are based on Ir. Ru electrocatalysts are a suitable alternative provided their performance is improved. Here we show that low-Ru-content pyrochlores (R2MnRuO7, R = Y, Tb and Dy) display high activity and durability for the OER in acidic media. Y2MnRuO7 is the most stable catalyst, displaying 1.5 V at 10 mA cm−2 for 40 h, or 5000 cycles up to 1.7 V. Computational and experimental results show that the high performance is owed to Ru sites embedded in RuMnOx surface layers. A water electrolyser with Y2MnRuO7 (with only 0.2 mgRu cm−2) reaches 1 A cm−2 at 1.75 V, remaining stable at 200 mA cm−2 for more than 24 h. These results encourage further investigation on Ru catalysts in which a partial replacement of Ru by inexpensive cations can enhance the OER performance.

Suggested Citation

  • Dmitry Galyamin & Jorge Torrero & Isabel Rodríguez & Manuel J. Kolb & Pilar Ferrer & Laura Pascual & Mohamed Abdel Salam & Diego Gianolio & Verónica Celorrio & Mohamed Mokhtar & Daniel Garcia Sanchez , 2023. "Active and durable R2MnRuO7 pyrochlores with low Ru content for acidic oxygen evolution," Nature Communications, Nature, vol. 14(1), pages 1-12, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-37665-9
    DOI: 10.1038/s41467-023-37665-9
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