Bernoulli's principle-mediated Cl₂ electrosynthesis.

Area of Science:

• Electrochemistry
• Chemical Engineering
• Materials Science

Background:

• Conventional chlorine (Cl2) synthesis methods face challenges with low productivity and high production costs.
• Electrochemical synthesis offers a potential alternative but requires efficient product separation and high performance.

Purpose of the Study:

• To develop an efficient and cost-effective electrochemical system for chlorine (Cl2) electrosynthesis.
• To improve chlorine gas separation and prevent product crossover using Bernoulli's principle.
• To demonstrate a high-rate Cl2 production prototype with reduced manufacturing costs.

Main Methods:

• Designed an electrochemical system incorporating an anodic chlorine evolution reaction (CER) connected to a gas chamber via a triple-phase gas diffusion layer.
• Applied Bernoulli's principle to modulate the gas diffusion layer, creating a pressure difference to drive oriented Cl2 migration.
• Integrated a pH-tolerant catalyst to build a standalone prototype device for high-rate Cl2 production.

Main Results:

• Achieved superior Cl2 synthesis performance with Faradaic efficiencies ranging from 96.3% to 87.6% over a current density range of 0.1 to 1.14 A cm-2.
• Demonstrated effective prevention of anodic/cathodic product crossover through oriented Cl2 migration.
• Technical-economic evaluations indicated a 6.75% reduction in Cl2 production cost compared to conventional chlor-alkali processes, saving approximately $1.17 million annually.

Conclusions:

• The developed electrochemical system provides an efficient and cost-effective method for Cl2 electrosynthesis.
• The application of Bernoulli's principle in gas diffusion layer design is key to enhanced performance and product separation.
• This approach offers a promising pathway for the industrial production of chlorine and potentially other chemical commodities.