A Roadmap for Plasma-Enabled Electrocatalysis in Urea Production

Area of Science:

• Green chemistry and sustainable energy solutions.
• Interdisciplinary research bridging plasma physics, electrochemistry, and chemical engineering.

Background:

• Current urea production relies on the energy-intensive Haber-Bosch process, contributing significantly to global energy consumption and CO2 emissions.
• Fossil fuel dependency in ammonia synthesis for urea production poses environmental challenges.

Purpose of the Study:

• To develop a modular, fully electrified, and sustainable alternative to conventional urea synthesis.
• To explore a novel pathway for producing urea from air and carbon dioxide at ambient conditions.

Main Methods:

• Utilizing non-thermal plasma to upgrade air to nitrate.
• Employing a CO2/nitrate co-electrolyzer for urea synthesis.
• Integrating principles from plasma physics, electrocatalysis, flow-battery engineering, and analytical chemistry.

Main Results:

• Demonstrated a cross-disciplinary approach to overcome bottlenecks in urea synthesis.
• Achieved high urea selectivity (≥70%) in the co-electrolyzer.
• Techno-economic modeling indicates potential for green urea production below fossil-based benchmarks with renewable electricity.

Conclusions:

• The proposed electrified route offers a viable and sustainable alternative for global urea production.
• Advancements in plasma technology, electrocatalysis, and reactor design are key to this novel synthesis.
• Cost-effective renewable electricity is crucial for the economic feasibility of green urea.