CO₂ electrolysis towards large scale operation: rational catalyst and electrolyte design for efficient flow-cell.

Area of Science:

• Electrochemistry
• Catalysis
• Renewable Energy

Background:

• Electrochemical CO2 reduction (CO2RR) offers a pathway to a carbon-neutral economy by converting CO2 into valuable fuels and chemicals.
• A comprehensive analysis of key performance indicators for CO2RR, including catalyst properties, reaction conditions, and flow cell technology, is currently limited.
• Developing efficient and scalable CO2RR technologies is crucial for mitigating climate change and advancing sustainable energy solutions.

Purpose of the Study:

• To provide a comprehensive analysis of factors influencing the electrochemical CO2 reduction reaction (CO2RR) in gas-fed flow cells.
• To discuss the impact of catalyst material design, electrolyte composition, and gas diffusion electrode (GDE) engineering on CO2RR performance.
• To address scale-up requirements and experimental challenges for advancing CO2RR technology.

Main Methods:

• Review and analysis of catalyst design principles for CO2RR.
• Discussion on electrolyte selection and its role in CO2RR performance.
• Examination of gas diffusion electrode (GDE) engineering strategies for flow cell applications.
• Identification of key performance indicators and scale-up requirements for CO2RR.

Main Results:

• Catalyst material, electrolyte, and GDE engineering significantly affect CO2RR performance in flow cells.
• Achieving high partial current densities (≥100 mA cm-2) and faradaic efficiencies are critical for scalable CO2RR.
• Identified experimental hurdles and proposed solutions for catalyst activity evaluation and data acquisition.

Conclusions:

• Rational design of catalysts, electrolytes, and GDEs is essential for efficient CO2RR.
• This work provides insights into optimizing CO2RR systems for renewable fuel and chemical production.
• Addressing scale-up challenges and standardizing experimental protocols will accelerate the development of CO2RR technology.