Photodriven Active Ion Transport Through a Janus Microporous Membrane. Issue 15 (24th February 2020)

• Record Type: Journal Article
• Authors: Yang, Jinlei; Liu, Pengchao; He, Xiao; Hou, Junjun; Feng, Yaping; Huang, Zhiwei; Yu, Lian; Li, Lianshan; Tang, Zhiyong
• Is Part Of: Angewandte Chemie international edition. Volume 59:Issue 15(2020)
• Page Start: 6244
• Page End: 6248
• Publication Date: 2020-02-24
• Subjects: conjugated microporous polymers -- graphene -- ion pumps -- Janus -- photovoltaics; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201916516
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Precise control of ion transport is a fundamental characteristic for the sustainability of life. It remains a great challenge to develop practical and high‐performance artificial ion‐transport system that can allow active transport of ions (protons) in an all solid‐state nanoporous material. Herein, we develop a Janus microporous membrane by combining reduced graphene oxide (rGO) and conjugated microporous polymer (CMP) for controllable photodriven ion transport. Upon light illumination, a net ionic current is generated from the CMP to the rGO side of the membrane, indicating that the rGO/CMP Janus membrane can realize photodriven directional and anti‐gradient ion transport. Analogously to the p‐n junction in photovoltaic devices, light is firstly converted into separated charges to trigger a transmembrane potential, which subsequently drives directional ion movement. For the first time, this method enables integration of a photovoltaic effect with an ionic field to drive active ion transport. With the advantages of scaled up production and easy fabrication, the concept of photovoltaic ion transport based on Janus microporous membrane may find wide application in energy storage and conversion, photodriven ion‐sieving, and water treatment. Abstract : About face : A reduced graphene oxide/conjugated microporous polymer (rGO/CMP) Janus microporous membrane was fabricated, which capitalizes on the high mass transport efficiency of a microporous membrane and the efficient electron–hole separation of a Janus architecture. Photoinduced electron–hole separation generates a transmembrane potential that drives active and directional ion transport.