The University of Notre Dame, in collaboration with Lawrence Livermore National Laboratory (LLNL) and colleagues at the University of Texas, has been developing technology for hybrid encapsulated ionic liquid (IL) and phase-change ionic liquid (PCIL) materials for post-combustion carbon dioxide (CO2) capture. Although ILs have many favorable properties as CO2-absorbing solvents, their typically high viscosities directly correlate with poor mass transfer rates and prohibit their practicable application in large-scale commercial operation when configured in conventional absorption/regeneration systems. Researchers’ work in identifying ILs and PCILs with high capacity and low regeneration energy that, when combined with their technology for microencapsulation of the ILs or PCILs in polymer shells, may enable synthesis of high surface area IL- and PCIL-based materials well-suited for CO2 capture from post-combustion flue gas. The goal of the project is successful synthesis of the microencapsulated ILs and/or PCILs and validated CO2 removal from simulated flue gas in a laboratory-scale unit, with demonstration of dramatically improved mass transfer rates.