Extended Data Fig. 5: CO₂ sorption of PCS-OH sorbents prepared in various conditions.

(a) CO₂ uptake (25 °C) of PCS-OH prepared at different potentials V for 4 h in three electrode configuration: 0.565 V and 0.365 V. (b) CO₂ uptake (25 °C) of PCS-OH prepared with various charging durations: 4 h, 1 h and 10 min. The charging processes were conducted in a Swagelok cell with potential holds at 0.565 V. (c) CO₂ uptake (25 °C) of PCS-OH and a “dripped cloth” sample which was prepared using a method adapted from the literature (see Methods). (d) Low-pressure region of the data in part (c), showing the greater low-pressure CO₂ uptake of PCS-OH at low pressures. (e) CO₂ adsorption isotherms of PCS-OH made from YP80F activated carbon film, referred to as PCS-OH (YP80F), and control sample of YP80F activated carbon film at 25 °C. (f) Low-pressure region of the CO₂ adsorption isotherms from (e). (g) CO₂ uptake of PCS-OH (YP80F) and control sample of YP80F activated carbon at 0.4 mbar and 25 °C.