Bubble-assisted cleaning for primary amine oxidation towards ampere-level current densities

Area of Science:

• Electrochemistry
• Green Chemistry
• Materials Science

Background:

• Organic molecular oxidation reactions offer an energy-saving alternative to oxygen evolution reaction (OER) for green hydrogen production.
• Scaling up hydrogen production presents challenges, including substantial oxygen release and electrode poisoning.

Purpose of the Study:

• To propose a coupled oxidation reaction strategy for stable, high-current density hydrogen production.
• To address electrode poisoning issues in electrochemical processes.
• To diversify high-value chemical outputs alongside hydrogen generation.

Main Methods:

• A bubble-assisted strategy was developed, activating OER and using generated oxygen bubbles.
• Benzylamine oxidation reaction (BOR) was used as a model reaction to produce benzonitrile.
• A prototype water electrolyzer was assembled and tested.

Main Results:

• The bubble-assisted strategy effectively removed insoluble products from the electrode surface.
• The prototype achieved a current density of 200 mA/cm² with 55% Faradaic efficiency at 1.65 V for over 40 hours.
• The system demonstrated stable operation and diversified chemical outputs.

Conclusions:

• The hybrid electrolysis with a bubble-assisted strategy provides a flexible approach for integrated electrochemical energy platforms.
• This method overcomes electrode poisoning and enables efficient, high-value chemical co-production.
• The strategy diversifies the applications of green hydrogen production technologies.