Influence of Composition and Nano-Scale Morphology on Enhancing the Acid Mediated Oxygen Evolution Electrocatalysis of Earth Abundant and Low PGM Containing Transition Metal Oxide Solid Solution Oxide Anodes

摘要: Acid mediated proton exchange membrane based water electrolysis (PEMWE) is currently at the forefront amongst various hydrogen production approaches for harvesting clean and sustainable hydrogen fuel.1-4 In the present study density functional theory (DFT), based calculations were used to rationalize the thermodynamics and kinetics of OER. Accordingly, we identified and fabricated theoretically predicted earth abundant metal oxide (e.g. MnO2 and SnO2) based solid solution electrocatalysts comprising low precious group metal (PGM-Ir) as solute and 10 wt. % anionic dopant (F) [(Mn,Ir)O2:F, (Sn,Ir)O2:F] in one-dimensional (1D) architectures (nanorods and nanotubes)1, 5. The as-synthesized (Mn0.8Ir0.2)O2:10F and (Sn0.8Ir0.2)O2:10F systems demonstrated superior OER electrocatalytic performance (Fig. 1A-B) in comparison to the state-of-the art IrO2 and 2D thin films of corresponding compositions …