Recent Development of Electrocatalytic CO₂ Reduction Application to Energy Conversion

Area of Science:

• Electrochemistry
• Materials Science
• Environmental Science

Background:

• Global carbon dioxide (CO2) emissions drive greenhouse gas pollution, necessitating effective CO2 recycling strategies.
• CO2 electroreduction reaction (CRR) presents a viable method for waste CO2 utilization.
• Electrocatalysts are crucial for controlling selectivity and activity in CRR processes.

Purpose of the Study:

• To review various electrocatalysts for CO2 electroreduction, including noble metals, transition metals, organic polymers, and carbon-based materials.
• To summarize recent advancements in two primary CRR applications: electricity generation (metal-CO2 batteries) and the synthesis of valuable carbonaceous products.
• To present and illustrate the reaction mechanisms of different CO2 electroreduction pathways to carbon-based fuels.

Main Methods:

• Comprehensive literature review of electrocatalysts for CO2 electroreduction.
• Analysis of metal-CO2 battery performance (Li-CO2, Na-CO2, Al-CO2, Zn-CO2).
• Illustration of reaction mechanisms for CO2 electroreduction to carbon-based fuels.

Main Results:

• Categorization of electrocatalysts (noble metals, transition metals, organic polymers, carbon-based materials) with their performance metrics (Faradaic efficiency, current density, onset potential).
• Summary of electrochemical properties for various metal-CO2 batteries.
• Presentation of diverse pathways and mechanisms for CO2 electroreduction to carbonaceous products.

Conclusions:

• The review provides insights into CRR processes, guiding electrocatalyst design, analysis techniques, and system innovation.
• Effective electrocatalyst selection is key to optimizing CRR for both energy generation and valuable product synthesis.
• Understanding reaction mechanisms is vital for advancing CO2 electroreduction technologies.