Integration of thermochemical water splitting with CO 2 direct air capture

Significance Global warming as a result of rising atmospheric CO 2 concentrations is considered an imminent threat to society. In order to address rising CO 2 concentrations, effective CO 2 capture directly from the atmosphere is likely to be necessary. We integrate direct air capture CO 2 and water splitting to produce a mixture of CO 2 and H 2 via a thermochemical water-splitting cycle. This mixture can, in turn, be used to produce valuable chemicals by known technologies. We demonstrate via experimental investigations and a technoeconomic analysis that the demonstrated integration of the 2 technologies into a single overall process has the potential to become economically favorable in some situations.