High Mass Transfer Rate in Electrocatalytic Hydrogen Evolution Achieved with Efficient Quasi-Gas Phase System

Area of Science:

• Electrochemistry
• Materials Science
• Chemical Engineering

Background:

• Hydrogen (H₂) bubble adhesion on electrode surfaces impedes electrolytic water splitting performance, particularly at high current densities.
• Efficient mass transfer of H₂ is crucial for optimizing electrolysis efficiency.

Purpose of the Study:

• To introduce a novel "quasi-gas phase" electrolytic water reaction system.
• To enhance hydrogen (H₂) mass transfer efficiency and overcome limitations of conventional systems.

Main Methods:

• Development of a "quasi-gas phase" electrolytic water reaction system utilizing capillary effects.
• Shifting the primary H₂ evolution site from the bulk solution to the gas phase above it.
• Electrochemical testing to evaluate system performance compared to conventional methods.

Main Results:

• The "quasi-gas phase" system effectively inhibits H₂ bubble aggregation and reduces diffusion resistance.
• A significant reduction in the required potential for H₂ evolution was observed at high current densities.
• Specifically, an overpotential reduction of 0.31 V was achieved at a current density of 250 mA cm⁻².

Conclusions:

• The proposed "quasi-gas phase" system offers a promising strategy for improving electrolytic water splitting efficiency.
• This approach effectively addresses the challenge of H₂ bubble adhesion, leading to enhanced performance.
• The system demonstrates potential for practical applications requiring high-efficiency hydrogen production.