High-Performance All-Solid-State Proton Rectifier Using a Heterogeneous Membrane Composed of Coordination Polymer and Layered Double Hydroxide

Jiangfeng Lu; Yukihiro Yoshida; Mitsuhiko Maesato; Hiroshi Kitagawa

doi:10.1002/anie.202213077

High-Performance All-Solid-State Proton Rectifier Using a Heterogeneous Membrane Composed of Coordination Polymer and Layered Double Hydroxide

Angew Chem Int Ed Engl. 2022 Dec 12;61(50):e202213077. doi: 10.1002/anie.202213077. Epub 2022 Nov 22.

Authors

Jiangfeng Lu¹, Yukihiro Yoshida¹, Mitsuhiko Maesato¹, Hiroshi Kitagawa¹

Affiliation

¹ Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto, 606-8502, Japan.

PMID: 36281564
DOI: 10.1002/anie.202213077

Abstract

Rational control of unidirectional proton transport is highly challenging, primarily owing to the difficulty in introducing an asymmetric factor into proton conducting media. In this study, free-standing membranes of a proton-conducting two-dimensional porous coordination polymer, Cu₂ (CuTCPP) (H₂ TCPP: 5,10,15,20-tetrakis(4-carboxyphenyl)porphyrin) and a hydroxide ion-conducting layered double hydroxide, Mg-Al-LDH(NO₃ ), were combined to generate a pH gradient in the conducting media. The current-voltage measurements revealed that the heterogeneous membrane exhibits a significant unidirectional proton transport with a proton rectification ratio exceeding 200 under 90 % relative humidity in the initial voltage scan. This value is the highest among the reported all-solid-state proton rectifiers. The high designability of both components with well-defined structures, which is in contrast to the organic polymers used so far, provides a new avenue for developing and understanding the proton-rectifying behavior in the solid state.

Keywords: All-Solid-State; Layered Double Hydroxide; Porous Coordination Polymer (PCP); Proton Rectification; Rectifier Device.