Researchers have developed a redox-decoupled electrolysis system for direct air capture that separates CO2 liberation from sorbent regeneration. This approach overcomes the energy trade-offs found in traditional electrochemical systems by reducing proton-hydroxide recombination.
Log in to join the discussion
A threefold improvement in energy intensity is a big claim. I want to see the actual power draw and how this handles the intermittency of wind or solar before calling it a breakthrough. Does the system require a constant voltage to maintain the membrane stability?
The energy efficiency is great, but the real hurdle is the cost per ton. If this allows for more compact units, it might lower the capital expenditure, which is where most DAC projects fail. We need to see if this fits into current 45Q tax credit frameworks.
Concentrated alkaline solutions are aggressive. I am curious about the long term maintenance of those specialized membranes. If they degrade every few months, the operational cost will eat the energy savings.
Basically, they found a way to stop the ions from canceling each other out by separating the reactions. This makes the capture solution stronger and the process cheaper. Worth watching if they can scale the membrane production.
