Femtosecond laser micro–nano technology for the construction of superhydrophilic/aerophobic electrodes for efficient full pH hydrogen evolution reaction

Abstract

In industrial hydrogen production, bubbles form rapidly at high current densities, hindering mass transfer and reducing active site exposure. Constructing electrocatalysts with superhydrophilic and superhydrophobic properties enhances HER performance. Traditional acidic HER catalysts are prone to corrosion, affecting water splitting and stability. Researchers seek catalysts active in neutral and alkaline media for large-scale hydrogen production. Using femtosecond laser-processed molybdenum flakes as a substrate, phosphorized cobalt electrocatalysts (CoP/fs-Mo) are designed and synthesized. CoP/fs-Mo demonstrates excellent aerophobic performance, reducing the contact area between bubbles and the solid surface, and promoting smaller and faster bubble release. As a result of its excellent acid and alkali resistance, CoP/fs-Mo exhibits efficient full-pH hydrogen evolution reaction activity as well as superior stability.