Monodentate hydroxide as a super strong yet reversible active site for CO2 capture from high-humidity flue gas

We demonstrate here that porous coordination frameworks, functionalized with monodentate hydroxide on the pore surface, can achieve ultrahigh CO2 adsorption affinity (124 kJ mol(-1)), adsorption capacity (9.1 mmol cm(-3) at 298 K and 1 bar), and CO2/N-2 selectivity (262 at 298 K) by the reversible formation/decomposition of bicarbonate in the adsorption/desorption processes. More importantly, these materials can capture up to 4.1 mmol cm(-3) or 13.4 wt% of CO2 from simulated flue gases (CO2 pressure 0.10-0.15 bar at 313 K) even at high relative humidity (82%) and quickly release it under mild regeneration conditions (N-2 purge at 358 K), representing the best CO2 capture performances reported to date.