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

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. Peña, José Luis G. Fierro and Sergio Rojas ()
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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

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41467-019-09791-w

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