Electrochemical CO_(2) capture offers a tunable,low-temperature alternative to thermal methods.Among available strategies,bipolar membrane electrodialysis(BPMED)and capacitive deionization(CDI)are notable for their di...Electrochemical CO_(2) capture offers a tunable,low-temperature alternative to thermal methods.Among available strategies,bipolar membrane electrodialysis(BPMED)and capacitive deionization(CDI)are notable for their distinct mechanisms.BPMED induces pH swings via water dissociation,while CDI concentrates CO_(2)-related ions through electric double-layer adsorption.This review provides a comparative evaluation of BPMED and CDI in terms of working principles,energy performance,system integration,and application scenarios,including direct air capture(DAC),carbon capture from industrial flue gas,and direct ocean capture(DOC).BPMED demonstrates high-capture rates and compatibility with in situ mineralization,whereas CDI offers lower energy demand and modular flexibility.Their respective strengths suggest potential complementarity-CDI may be better suited to treat liquid phase systems derived from point-source emissions,in which dissolved inorganic carbon species dominate the ionic composition and the background of competing ions is relatively controllable;BPMED may be better suited for treating environmental carbon sources with large volumes,low concentrations or high ionic strength.This framework offers potential insights for developing scalable electrochemical CO_(2) capture systems.展开更多
基金financially supported by Key Project of Tianjin Natural Science Foundation(23JCZDJC00570)Special Funding of China Post-doctoral Science Foundation(2023T160268)+1 种基金China Postdoctoral Science Foundation(2023M741362)the National Key Research and Development Program of China(No.2022YFC2904000).
文摘Electrochemical CO_(2) capture offers a tunable,low-temperature alternative to thermal methods.Among available strategies,bipolar membrane electrodialysis(BPMED)and capacitive deionization(CDI)are notable for their distinct mechanisms.BPMED induces pH swings via water dissociation,while CDI concentrates CO_(2)-related ions through electric double-layer adsorption.This review provides a comparative evaluation of BPMED and CDI in terms of working principles,energy performance,system integration,and application scenarios,including direct air capture(DAC),carbon capture from industrial flue gas,and direct ocean capture(DOC).BPMED demonstrates high-capture rates and compatibility with in situ mineralization,whereas CDI offers lower energy demand and modular flexibility.Their respective strengths suggest potential complementarity-CDI may be better suited to treat liquid phase systems derived from point-source emissions,in which dissolved inorganic carbon species dominate the ionic composition and the background of competing ions is relatively controllable;BPMED may be better suited for treating environmental carbon sources with large volumes,low concentrations or high ionic strength.This framework offers potential insights for developing scalable electrochemical CO_(2) capture systems.
