Energy-efficient solvents with favorable thermodynamic properties that offer significantly low regeneration energy to the state-of-the-art CO2 capture technologies are typically limited by slow reactivity with CO2. To compensate for low absorption rates, herein, we report that the nonporous hypercross-linked polymeric (HCP) networks as rate promoters are capable of drastically accelerating CO2 absorption in N-methyldiethanolamine (MDEA) sorbents. It is a new topic toward the application of HCPs. Two HCPs were synthesized from cost-effective monomers: polystyrene (HCP-S) and benzene (HCP-B), and then the novel slurry solvents were prepared by suspending HCP-S and HCP-B in MDEA solutions. Benefiting from the inherent properties, HCP-S and HCP-B increased the overall rates of CO2 absorption in the MDEA solution by 253 and 130%, respectively, compared to the blank MDEA. The effect of temperature and amine concentration on the promoting performance of HCP-B was investigated. HCP-B promotes CO2 sorption in the whole temperature range from 25 to 80 degrees C, and at 2 to 4 molar concentrations of MDEA_ The promoting effect of HCP-B was also observed in the DEA solvent, demonstrating that it is not unique to MDEA. Moreover, C-13 NMR analysis was used to confirm the promoting effect of the network on CO2 sorption, and a possible mechanism was investigated.