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Na-doped ruthenium perovskite electrocatalysts with improved oxygen evolution activity and durability in acidic media

Author

Listed:
  • María Retuerto

    (Instituto de Catálisis y Petroleoquímica)

  • Laura Pascual

    (Instituto de Catálisis y Petroleoquímica)

  • Federico Calle-Vallejo

    (Universitat de Barcelona)

  • Pilar Ferrer

    (Harwell Science and Innovation Campus)

  • Diego Gianolio

    (Harwell Science and Innovation Campus)

  • Amaru González Pereira

    (Instituto de Catálisis y Petroleoquímica)

  • Álvaro García

    (Instituto de Catálisis y Petroleoquímica)

  • Jorge Torrero

    (Instituto de Catálisis y Petroleoquímica)

  • María Teresa Fernández-Díaz

    (Institut Laue-Langevin, BP156X)

  • Peter Bencok

    (Harwell Science and Innovation Campus)

  • Miguel A. Peña

    (Instituto de Catálisis y Petroleoquímica)

  • José Luis G. Fierro

    (Instituto de Catálisis y Petroleoquímica)

  • Sergio Rojas

    (Instituto de Catálisis y Petroleoquímica)

Abstract

The design of active and durable catalysts for the H2O/O2 interconversion is one of the major challenges of electrocatalysis for renewable energy. The oxygen evolution reaction (OER) is catalyzed by SrRuO3 with low potentials (ca. 1.35 VRHE), but the catalyst’s durability is insufficient. Here we show that Na doping enhances both activity and durability in acid media. DFT reveals that whereas SrRuO3 binds reaction intermediates too strongly, Na doping of ~0.125 leads to nearly optimal OER activity. Na doping increases the oxidation state of Ru, thereby displacing positively O p-band and Ru d-band centers, weakening Ru-adsorbate bonds. The enhanced durability of Na-doped perovskites is concomitant with the stabilization of Ru centers with slightly higher oxidation states, higher dissolution potentials, lower surface energy and less distorted RuO6 octahedra. These results illustrate how high OER activity and durability can be simultaneously engineered by chemical doping of perovskites.

Suggested Citation

  • María Retuerto & Laura Pascual & Federico Calle-Vallejo & Pilar Ferrer & Diego Gianolio & Amaru González Pereira & Álvaro García & Jorge Torrero & María Teresa Fernández-Díaz & Peter Bencok & Miguel A, 2019. "Na-doped ruthenium perovskite electrocatalysts with improved oxygen evolution activity and durability in acidic media," Nature Communications, Nature, vol. 10(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-09791-w
    DOI: 10.1038/s41467-019-09791-w
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