Publications

The development of CO₂ capture technology is essential as a global warming mitigation technology that will lead to the suppression of climate change. Gas separation membranes have great potential for direct air capture (DAC), which captures CO₂ directly from the atmosphere, as well as from large CO₂ emission sources, due to their low energy consumption and small footprint. However, membrane–based DAC has never been considered because of its low CO₂ permeance. Recently, there have been report of high CO₂ permeance membranes which would be promising candidate for DAC process. In this review paper, the recent studies of membranes with high CO₂ permeance are summarized and discuss with molecular design of membranes in addition to our recent efforts to improve CO₂ selectivity of nanometer–thick freestanding membranes by chemical modification of the membrane surface.