We monitored the CO2 concentration in line with the cuvette-reactor depicted in Figure , while constantly flowing 400 ppm CO2 diluted in N2, and desorbing CO2 using light or applied heat. Figure shows the resulting profile for the photo-swing and temperature-swing desorption under dry (Figure and 3B, respectively) and humid CO2 flow (Figure for PEI-based sorbents reported between 1 and 3 mmol CO2/ g PEI. The presence of TiN resulted in a 10-fold increase in photo-swing CO2 desorption compared to a control sample without TiN (Figure ).