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Designing highly active and robust electrocatalysts for oxygen evolution reaction (OER) is crucial for many renewable energy storage and conversion devices. Here, self‐supported monolithic hybrid electrodes that are composed of bimetallic cobalt–molybdenum nitride nanosheets vertically aligned on 3D and bicontinuous nanoporous gold (NP Au/CoMoNx) are reported as highly efficient electrocatalysts to boost the sluggish reaction kinetics of water oxidation in alkaline media. By virtue of the constituent CoMoNx nanosheets having large accessible CoMoOx surface with remarkably enhanced electrocatalytic activity and the nanoporous Au skeleton facilitating electron transfer and mass transport, the NP Au/CoMoNx electrode exhibits superior OER electrocatalysis in 1 m KOH, with low onset overpotential (166 mV) and Tafel slope (46 mV dec−1). It only takes a low overpotential of 370 mV to reach ultrahigh current density of 1156 mA cm−2, ≈140‐fold higher than free CoMoNx nanosheets. The electrocatalytic performance makes it an attractive candidate as the OER catalyst in the water electrolysis.
A flexible Co–Mo–N/Au electrode, which is composed of bimetallic cobalt–molybdenum nitride nanosheets vertically aligned on nanoporous gold, is successfully developed as a robust oxygen evolution reaction (OER) electrocatalyst in alkaline media. This electrode exhibits enhanced OER activity and durability by virtue of the CoMoNx nanosheets having large accessible CoMoOx surface and the nanoporous Au facilitating electron transfer and mass transport.