I mean if the material of the film is such that It is hydrophobic with high contact angle value, then whether it lowers the catalytic performances of the film as electrocatalysts in aqueous electrolyte.
High water contact angle value will inhabit the direct contacting of catalysts with the electrolyte, which will decrease the efficiency of electrocatalysts. Jiang and co-workers have done some distingushed researches about that, which were adhered in the attachement. Best whish!
If material is hydrophobic then contact area of electrolyte (here aqueous) with is less. If you further increase roughness of the hydrophobic surface then contact angle will increase and area of electrolyte in contact with surface will further decrease according to Cassie-Baxter equation. Higher contact area of solid liquid will assure better performance. You can try mixing electrolyte with some non-polar liquids to increase contact area and performance there by. For Cassie-Baxter equation you can have look at
https://www.researchgate.net/publication/232389224_Self-cleaning_silica_coatings_on_glass_by_single_step_sol-gel_route
Article Self-cleaning silica coatings on glass by single step sol–gel route
The influence on gas phase generating electrochemistry is noted above. But absent gas phase formation, immediately when a film is fully immersed, all discussion of contact angle is secondary. Surface chemistry is key. It will alter the double layer, creating an overpotential for the electrochemistry.
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