BACKGROUND
CO2 electrolysis is a promising technology for converting carbon dioxide into valuable chemicals like carbon monoxide and hydrocarbons using electricity. Traditionally, this process involves a cathode catalyst, an anode catalyst in an alkaline electrolyte, and a commercial thick membrane to separate them. However, these thick membranes pose significant challenges. Cation exchange membranes lead to alkali metal transport from the anode to the cathode, causing salt formation and operational instability. Conversely, anion exchange membranes cause carbonate crossover, resulting in CO2 loss, reduced selectivity, and decreased anolyte alkalinity.
Researchers at the University of Calgary addressed these issues by employing an ultrathin polymer coating, applied via a simple spray coating method, to cover the cathode catalyst. This approach eliminates the need for physical stand-alone thick membranes, reduces costs, and enhances scalability. By incorporating alkali metal salts into the ionomer composition, competing reactions are suppressed, improving selectivity, and ensuring stable, high-current operation for industrial-scale CO2 electrolysis.
AREAS OF APPLICATION
- Converting industrial emissions into valuable chemicals
- Storing renewable energy as chemical fuels such as hydrogen
- Producing eco-friendly fuels from CO2
- Recycling CO2 into useful products
COMPETITIVE ADVANTAGES
- Eliminates the need for expensive, thick stand-alone membranes
- Simple spray coating method allows for large-scale application
- Reduces CO2 loss and increases selectivity for desired products
- Prevents alkali metal transport and carbonate crossover, ensuring consistent performance
PUBLICATIONS & RESOURCES
- Patent publications: WO2024086935A1
- Journal Publications: https://onlinelibrary.wiley.com/doi/full/10.1002/aenm.202203158
- Researcher profile: Md Kibria
- Lab website: Department of Chemical and Petroleum Engineering