Nanoporous multimetallic Ir alloys as efficient and stable electrocatalysts for acidic oxygen evolution reactions

The dearth of appropriate electrocatalysts for stable anodic water splitting, oxygen evolution reaction (OER), in acid has given rise to concerted efforts toward making iridium-based high aspect ratio nanoma-terials, as iridium and its higher valent oxides have been shown time and again to exhibit the most opti-mal balance between activity and durability. Here, we show a dealloying strategy to synthesize free -standing 3D, oxide skinned nanoporous Ir electrocatalysts (np-Ir) with demonstrated enhanced activity and durability in comparison to more traditional IrOx nanoparticulate catalysts. The metallic core and absence of any binder/support result in low electrode and charge transfer resistance, ultimately giving rise to lower OER overpotentials and improved activity. (C) 2020 Elsevier Inc. All rights reserved.

Automated summary

This study presents a dealloying strategy to synthesize free-standing 3D, oxide-skinned nanoporous Ir electrocatalysts with enhanced activity and durability compared to traditional IrOx nanoparticulate catalysts. The metallic core and absence of binder/support result in low electrode and charge transfer resistance, ultimately leading to lower OER overpotentials and improved activity.