Metal–Organic Framework Membrane Nanopores as Biomimetic Photoresponsive Ion Channels and Photodriven Ion Pumps

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Abstract
Biological ion channels and ion pumps with sub‐nanometer sizes modulate ion transport in response to external stimuli. Realizing such functions with sub‐nanometer solid‐state nanopores has been an important topic with wide practical applications. Herein, we demonstrate a biomimetic photoresponsive ion channel and photodriven ion pump using a porphyrin‐based metal–organic framework membrane with pore sizes comparable to hydrated ions. We show that the molecular‐size pores enable precise and robust optoelectronic ion transport modulation in a broad range of concentrations, unparalleled with conventional solid‐state nanopores. Upon decoration with platinum nanoparticles to form a Schottky barrier photodiode, photovoltage across the membrane is generated with “uphill” ion transport from low concentration to high concentration. These results may spark applications in energy conversion, ion sieving, and artificial photosynthesis.
Funding Information
  • National Natural Science Foundation of China (21790390, 21790391)
  • National Natural Science Foundation of China (21605147, 21790393)
  • National Basic Research Program of China (2016YFA0200104)
  • Chinese Academy of Sciences (XDB30000000)
  • Chinese Academy of Sciences (QYZDJ-SSW-SLH030)
  • Youth Innovation Promotion Association of the Chinese Academy of Sciences

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