%0 Journal Article
%A Retuerto, Maria
%A Pascual, Laura
%A Torrero, Jorge
%A Salam, Mohamed Abdel
%A Tolosana-Moranchel, Alvaro
%A Gianolio, Diego
%A Ferrer, Pilar
%A Kayser González, Paula
%A Wilke, Vincent
%A Stiber, Svenja
%A Celorrio, Verónica
%A Mokthar, Mohamed
%A Garcia-Sanchez, Daniel
%A Gago, Aldo Saul
%A Friedrich, Kaspar Andreas
%A Peña, Miguel Antonio
%A Alonso, Jose Antonio
%A Rojas, Sergio
%T Highly active and stable OER electrocatalysts derived from Sr2MIrO6 for proton exchange membrane water electrolyzers
%D 2022
%U https://hdl.handle.net/20.500.14352/92537
%X 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.
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