Highly active and stable OER electrocatalysts derived from Sr₂MIrO₆ for proton exchange membrane water electrolyzers.

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 develop

SUBMITTER: Retuerto M 

PROVIDER: S-EPMC9789951 | biostudies-literature | 2022 Dec

REPOSITORIES: biostudies-literature