Nano-metal diborides-supported anode catalyst with strongly coupled TaO_x/IrO₂ catalytic layer for low-iridium-loading proton exchange membrane electrolyzer.

ABSTRACT: The sluggish kinetics of oxygen evolution reaction (OER) and high iridium loading in catalyst coated membrane (CCM) are the key challenges for practical proton exchange membrane water electrolyzer (PEMWE). Herein, we demonstrate high-surface-area nano-metal diborides as promising supports of iridium-based OER nanocatalysts for realizing efficient, low-iridium-loading PEMWE. Nano-metal diborides are prepared by a novel disulphide-to-diboride transition route, in which the entropy contribution to the Gibbs free energy by generation of gaseous sulfur-containing products plays a crucial role. The nano-metal diborides, TaB₂ in particular, are investigated as the support of IrO₂ nanocatalysts, which finally forms a TaO_x/IrO₂ heterojunction catalytic la

SUBMITTER: Wang Y 

PROVIDER: S-EPMC10447464 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature