“…1–3 Electrochemical water splitting is widely regarded as a recycled strategy to produce clean and renewable H 2 . 4,5 Nonetheless, one of the major technological obstacles for large-scale hydrogen production is the low thermodynamic kinetics of water splitting with large overpotential and the usage of expensive electrodes. 6–8 At present, the most effective catalysts for electrochemical overall water splitting are noble metal-based materials, for example, platinum-based alloys/compounds for the hydrogen evolution reaction (HER) and RuO 2 /IrO 2 -based electrocatalysts for the oxygen evolution reaction (OER).…”