Facile Construction of IrRh Nanosheet Assemblies As Efficient and Robust Bifunctional Electrocatalysts for Overall Water Splitting

The exploration of bifunctional electrocatalysts featuring high activity and excellent durability for overall water splitting is of significance for producing high-purity hydrogen from water. Here, we report the facile preparation of bimetallic IrRh nanosheet assemblies (IrRh NAs) by a simple one-pot solution-chemical method. Benefiting from the electronic structure effect of bimetallic composition and unique nanoarchitectures with abundant catalytically active sites and mass diffusion pathways, the as-constructed IrRh NAs can efficiently drive both the hydrogen and oxygen evolution reactions in alkaline conditions. Moreover, the two-electrode water splitting system composed of bifunctional IrRh NAs as both cathodic and anodic catalysts could achieve 10 mA cm–2 with a low cell voltage of 1.57 V.