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Instruments / Technical Area	Publication Details	Published	Actions
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
B18-Core EXAFS	Role of lattice oxygen content and Ni geometry in the oxygen evolution activity of the Ba-Ni-O system María Retuerto , Federico Calle-Vallejo , Laura Pascual , Pilar Ferrer , Álvaro García , Jorge Torrero , Diego Gianolio , José Luis G. Fierro , Miguel A. Peña , José Antonio Alonso , Sergio Rojas Journal Of Power Sources 404, 56 - 63 DOI: 10.1016/j.jpowsour.2018.09.098 Diamond Proposal Number(s): [18119] Show Abstract ▼ Abstract: The activity of oxides towards the oxygen evolution reaction (OER) is usually tuned by changing the transition metal components and/or the surface facets. An important yet less studied feature is the repercussion of the lattice oxygen content of the oxide in the active site's coordination and catalytic performance. This is illustrated here for the Ba-Ni-O system. We synthesized two oxides with Ni in different coordination and oxidation states, namely BaNiO2 with Ni2+ in square-planar positions, and BaNiO2.78(2) with Ni3+ and Ni4+ in octahedral positions. We show that the square-planar configuration of Ni endows BaNiO2 with high intrinsic OER activity, comparable to the best catalysts in the literature. DFT indicates that progressively lowering the lattice oxygen content from BaNiO3 to BaNiO2 increases the Ni sites' affinity for the reaction intermediates, thereby lowering the OER overpotential. Thus, oxygen content is an important parameter in oxide catalysts, as it modulates the coordination, orbital splitting, oxidation number, and catalytic activity of the active sites.	Nov 2018

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