Rapid CO2 Desorption via a Joule-Heated Carbon Hollow Fiber Membrane

The regeneration of CO 2 -loaded solvents remains intrinsically energy-intensive and represents a major bottleneck in carbon capture. Here, we develop a Joule-heated carbon hollow fiber membrane (CHFM) to enable rapid and energy-efficient CO 2 desorption from ethanolamine (MEA) via a membrane flash process. Benefiting from the intrinsic electrical conductivity of the porous carbon matrix, thermal energy is generated directly within the membranes by a self-Joule-heating, delivering localized heating at the desorption interface and thereby effectively mitigating temperature polarization. Meanwhile, the highly porous membrane structure provides abundant nucleation sites that promote rapid CO 2 phase transition within the membrane wall. Compared with the conventional external heating method, the Joule-heated mode achieves more than a twofold enhancement in CO 2 desorption performance at ∼70 °C. Specifically, a CO 2 flux of 0.096 mol m -2 s -1 and a desorption ratio of 22% are obtained with a short residence time of 2 s. The specific equivalent energy consumption is reduced to 0.64 MJ kg -1 CO 2 , substantially lower than that of conventional industrial regeneration processes. This study demonstrates a robust membrane-based route for intensified and scalable CO 2 solvent regeneration.