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Instruments / Technical Area	Publication Details	Published	Actions
B18-Core EXAFS	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 , Veronica Celorrio , Mohamed Mokhtar , Daniel Garcia Sanchez , Aldo Saul Gago , Kaspar Andreas Friedrich , Miguel A. Peña , José Antonio Alonso , Federico Calle-Vallejo , Maria Retuerto , Sergio Rojas Nature Communications 14 DOI: 10.1038/s41467-023-37665-9 Open Access Show 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.	Apr 2023
B18-Core EXAFS	Highly active and stable OER electrocatalysts derived from Sr2MIrO6 for proton exchange membrane water electrolyzers Maria Retuerto , Laura Pascual , Jorge Torrero , Mohamed Abdel Salam , Alvaro Tolosana-Moranchel , Diego Gianolio , Pilar Ferrer , Paula Kayser , Vincent Wilke , Svenja Stiber , Veronica Celorrio , Mohamed Mokthar , Daniel García Sanchez , Aldo Saul Gago , Kaspar Andreas Friedrich , Miguel Antonio Peña , José Antonio Alonso , Sergio Rojas Nature Communications 13 DOI: 10.1038/s41467-022-35631-5 Diamond Proposal Number(s): [27733] Open Access Show Abstract ▼ Abstract: Proton exchange membrane water electrolysis is a promising technology to produce green hydrogen from renewables, as it can efficiently achieve high current densities. Lowering iridium amount in oxygen evolution reaction electrocatalysts is critical for achieving cost-effective production of green hydrogen. In this work, we develop catalysts from Ir double perovskites. Sr2CaIrO6 achieves 10 mA cm−2 at only 1.48 V. The surface of the perovskite reconstructs when immersed in an acidic electrolyte and during the first catalytic cycles, resulting in a stable surface conformed by short-range order edge-sharing IrO6 octahedra arranged in an open structure responsible for the high performance. A proton exchange membrane water electrolysis cell is developed with Sr2CaIrO6 as anode and low Ir loading (0.4 mgIr cm−2). The cell achieves 2.40 V at 6 A cm−2 (overload) and no loss in performance at a constant 2 A cm−2 (nominal load). Thus, reducing Ir use without compromising efficiency and lifetime.	Dec 2022

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