Engineering Superaerophobic Electrodes Using Hydrophilic PEDOT and Colloidal Lithography for Enhanced Bubble Release...

Area of Science:

• Electrochemistry
• Materials Science
• Nanotechnology

Background:

• Efficient gas bubble removal is crucial for reducing overpotential and enhancing electrode stability in hydrogen evolution reactions (HER).
• Existing electrode materials face challenges in managing gas bubble adhesion, limiting their performance.

Purpose of the Study:

• To develop superaerophobic electrode surfaces for improved HER efficiency.
• To investigate the impact of functionalized polymers and colloidal lithography on electrode performance.

Main Methods:

• Fabrication of superaerophobic surfaces using hydrophilic functionalized poly(3,4-ethylenedioxythiophene) (PEDOT) and colloidal lithography with polystyrene (PS) beads (100, 200, 500 nm).
• Electropolymerization of EDOT monomers with hydroxymethyl (EDOT-OH) and sulfonate (EDOT-SuNa) functional groups.
• Characterization of surface properties (water contact angle) and HER performance (overpotential, stability).

Main Results:

• The electrode modified with poly(EDOT-SuNa) and 200 nm PS beads (SuNa/Ni/Au-200) achieved the highest hydrophilicity (water contact angle of 37°).
• A significant reduction in overpotential from -388 mV to -273 mV at -10 mA cm⁻² was observed for the optimized electrode.
• The approach demonstrated improved HER activity and stability when applied to commercial nickel foam electrodes.

Conclusions:

• Superaerophobic electrode surfaces constructed with functionalized polymers and colloidal lithography effectively enhance HER efficiency.
• The developed method offers a promising strategy for promoting catalytic efficiency by optimizing gas bubble management.
• This technology has potential applications in improving hydrogen production technologies.