Rational engineering of superaerophobic CoMoSx electrocatalysts for overall water splitting

Superaerophobic electrocatalyst has recently emerged as the promising solution for tackling the gas bubbles adhesion and departure issues in gas evolution reaction. However, the systematic investigation of the morphology-dependent superaerophobicity and the resulted electrocatalytic performance has been less developed. We herein reported a facile in situ chalcogel method to modulate CoMoS x supported on the nickel foam (NF) with three distinct geometries through varying the synthesis time. The morphologies of supported CoMoS x on NF featuring with different roughness were related to the underwater superaerophobicity. Accordingly, the electrocatalytic performance and the size of the gas bubbles released from the surface varied with the morphology evolution. Furthermore, as bifunctional electrocatalysts, the optimal CoMoS x /NF-1h with hierarchical nanostructure could sustain an extremely high current density of 500 mA/cm 2 for overall water splitting at 1.89 V. The current results offered an insight for further engineering superaerophobic electrocatalysts in a practical manner.