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

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, Aldo Saul Gago, Kaspar Andreas Friedrich, Miguel A. Peña, José Antonio Alonso, Federico Calle-Vallejo, María Retuerto () and Sergio Rojas ()
Additional contact information
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
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

Nature Communications, 2023, vol. 14, issue 1, 1-12

Abstract: 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.

Date: 2023
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DOI: 10.1038/s41467-023-37665-9

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