Modular Design of Noble Metal‐free Mixed Metal Oxide Electrocatalysts for Complete Water‐Splitting

Abstract: Electrocatalytic water splitting into H2 and O2 is a key technology for carbon‐neutral energy. Here, we report a modular materials design leading to noble metal‐free composite electrocatalysts, which combine high electrical conductivity, high OER and HER reactivity and high durability. The scalable bottom‐up fabrication allows the stable deposition of mixed metal oxide nanostructures with different functionalities on copper foam electrodes. The composite catalyst shows sustained OER and HER activity in 0.1 M aqueous KOH over prolonged periods (t > 10 h) at low overpotentials (OER: ~300 mV; HER: ~100 mV) and high faradaic efficiencies (OER: ~100 %, HER: ~98 %). The new synthetic approach could give access to a new class of multifunctional, mixed metal oxide composites for challenging energy conversion and storage reactions.

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