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

DOI: 10.1038/s41467-023-37665-9 DOI Help

Authors: Dmitry Galyamin (Instituto de Catálisis y Petroleoquímica, CSIC) , Jorge Torrero (German Aerospace Center (DLR)) , Isabel Rodríguez (Instituto de Catálisis y Petroleoquímica, CSIC) , Manuel J. Kolb (Universitat de Barcelona) , Pilar Ferrer (Diamond Light Source) , Laura Pascual (Instituto de Catálisis y Petroleoquímica, CSIC) , Mohamed Abdel Salam (King Abdulaziz University) , Diego Gianolio (Diamond Light Source) , Veronica Celorrio (Diamond Light Source) , 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 (Instituto de Catálisis y Petroleoquímica, CSIC) , José Antonio Alonso (Instituto de Ciencia de Materiales de Madrid, CSIC) , Federico Calle-Vallejo (Universitat de Barcelona; University of the Basque Country UPV/EHU; IKERBASQUE, Basque Foundation for Science) , Maria Retuerto (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 14

State: Published (Approved)
Published: April 2023

Open Access Open Access

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.

Journal Keywords: Electrocatalysis; Fuel cells

Diamond Keywords: Fuel Cells

Subject Areas: Chemistry, Energy, Environment

Instruments: B18-Core EXAFS

Other Facilities: MSPD at ALBA

Added On: 17/04/2023 10:27


Discipline Tags:

Energy Storage Earth Sciences & Environment Sustainable Energy Systems Energy Climate Change Physical Chemistry Catalysis Chemistry

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS)