Low Cost Electrochemical DAC
Capture of carbon dioxide directly from the air (DAC) for sequestration is an economically challenging process partly due to its ironically low concentration and the energy costs for regenerating sorbents.
Basic solutions react with carbon dioxide to form soluble carbonates and bicarbonates, these in turn react with acids to liberate carbon dioxide and regenerate a salt. While this cycle is well known, it may be possible to use an electrolyser to regenerate the acid and basic solution from the salt, all while the electrolyser is also being used to produce hydrogen. Such a system would enable hydrogen production and DAC to share significant parts of a system, slashing CAPEX costs and providing greater flexibility in renewable electricity use.
This technology is at an early stage of development but shows promise for being one of the most cost-effective methods to perform DAC. I’m carrying out preliminary designs, proof-of-principal experiments, and a technoeconomic analysis to assess the business case for this technology. If you are interested in exploring commerical or investment opportunities contact me at graham@gtsmith.uk