▎ 摘　　要

NOVELTY - Composite comprises: a nonwoven carbon nanotube mat comprising many entangled carbon nanotubes; and an electroactive species disposed on the nonwoven carbon nanotube mat, where the electroactive species is capable of bonding with a target gas when the electroactive species is in a reduced state and releasing the target gas when the electroactive species is in an oxidized state. USE - The composite is useful for electrochemical gas separation. ADVANTAGE - The composite: utilizes carbon nanotube mat which enables a higher capture rate than when using a thicker or less porous material; and exhibits improved cycle life. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) electrode assembly comprising a porous separator, and the composite; (2) electrochemical cell (100) comprising the composite; (3) gas separation system comprising many electrochemical cells in fluid communication with a gas inlet and a gas outlet; (4) making (M1) the composite, comprising contacting the nonwoven carbon nanotube mat with the electroactive species; and (5) making (M2) the composite comprising contacting a solution comprising many electroactive monomers, at least one initiator, and optionally, a crosslinker with the nonwoven carbon nanotube mat, and initiating polymerization in the presence of the nonwoven carbon nanotube mat. DESCRIPTION OF DRAWING(S) - The figure shows a schematic illustration of an electrochemical cell. Electrochemical cell (100) First electrode (110) Gas diffusion layer (115) Gas flow field (160) Second electrode (170)