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

DOI: 10.1038/s41467-019-09791-w DOI Help

Authors: María Retuerto (Instituto de Catálisis y Petroleoquímica, CSIC) , Laura Pascual (Instituto de Catálisis y Petroleoquímica, CSIC) , Federico Calle-Vallejo (Universitat de Barcelona) , Pilar Ferrer (Diamond Light Source) , Diego Gianolio (Diamond Light Source) , Amaru González Pereira (Instituto de Catálisis y Petroleoquímica, CSIC) , Álvaro García (Instituto de Catálisis y Petroleoquímica, CSIC) , Jorge Torrero (Instituto de Catálisis y Petroleoquímica, CSIC) , María Teresa Fernández-Díaz (Institut Laue-Langevin) , Peter Bencok (Diamond Light Source) , Miguel A. Peña (Instituto de Catálisis y Petroleoquímica, CSIC) , José Luis G. Fierro (Instituto de Catálisis y Petroleoquímica, CSIC) , Sergio Rojas (Instituto de Catálisis y Petroleoquímica, CSIC)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nature Communications , VOL 10

State: Published (Approved)
Published: May 2019

Open Access Open Access

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.

Journal Keywords: Electrocatalysis; Renewable energy; Solid-state chemistry

Subject Areas: Chemistry, Materials, Energy

Instruments: B18-Core EXAFS , I10-Beamline for Advanced Dichroism


Discipline Tags:

Catalysis Physical Chemistry Earth Sciences & Environment Climate Change Energy Sustainable Energy Systems Material Sciences Metallurgy Perovskites Chemistry

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS)