Direct air capture (DAC) by electrically driven temperature swing adsorption (ETSA) is an emerging technology due to its simplicity and ease of pairing with renewable electricity energy sources. Herein, we describe the preparation of sorbent-coated carbon fibers via roll-to-roll process that exhibit 400 ppm CO₂ adsorption of ∼1.2 mmol g_fiber⁻¹. The fibers exhibit Joule heating upon application of a potential, reaching CO₂ regeneration temperatures within 1 min. DAC modules show fast electrothermal CO₂ desorption with directly applied electric potential, releasing the adsorbed CO₂ six times faster than externally driven thermal desorption. The simplicity and modularity of the sorbent-coated carbon fibers and their rapid adsorption/desorption cycling by ETSA have the potential to improve the productivity of DAC systems. A techno-economic analysis of a pilot-scale ETSA-DAC system projects an overall cost of about 160 $ tCO₂⁻¹, with convective energy losses to the ambient accounting for only 7% of the Joule heating input during desorption.

通过电驱动变温吸附 (ETSA) 进行的直接空气捕获 (DAC) 是一项新兴技术，因为它简单且易于与可再生能源配对。在此，我们描述了通过卷对卷工艺制备吸附剂涂层碳纤维，该工艺展示了 ∼1.2 mmol g_纤维^{−1的 400 ppm CO} ₂吸附。纤维在施加电势时表现出焦耳热，在 1 分钟内达到 CO ₂再生温度。DAC 模块通过直接施加电势显示快速电热 CO _{2解吸，释放吸附的 CO 2}比外部驱动的热脱附快六倍。吸附剂涂层碳纤维的简单性和模块化及其通过 ETSA 的快速吸附/解吸循环有可能提高 DAC 系统的生产率。中试规模 ETSA-DAC 系统的技术经济分析预计总成本约为 160 $ tCO ₂ ⁻¹，在解吸过程中，环境的对流能量损失仅占焦耳热输入的 7%。