Proton-electron coupling and mixed conductivity in a hydrogen-bonded coordination polymer

Minju Park, Huiyeong Ju, Joohee Oh, Kwangmin Park, Hyunseob Lim (), Seok Min Yoon () and Intek Song ()
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Minju Park: Department of Chemical and Biological Engineering, Andong National University (ANU)
Huiyeong Ju: Research Center for Materials Analysis, Korea Basic Science Institute
Joohee Oh: Department of Chemistry, Gwangju Institute of Science and Technology (GIST)
Kwangmin Park: Department of Chemical and Biological Engineering, Andong National University (ANU)
Hyunseob Lim: Department of Chemistry, Gwangju Institute of Science and Technology (GIST)
Seok Min Yoon: Department of Chemistry, Gyeongsang National University
Intek Song: Department of Chemical and Biological Engineering, Andong National University (ANU)

Nature Communications, 2025, vol. 16, issue 1, 1-12

Abstract: Abstract The fundamental understanding of coupled proton-electron transport in mixed protonic-electronic conductors (MPECs) remains unexplored in materials science, despite its potential significance within the broader context of mixed ionic-electronic conductors (MIECs) and the possibility of controlled diffusion of protons using hydrogen-bond networks. To address these limitations, we present a hydrogen-bonded coordination polymer Ni-BAND ({[Ni(bpy)(H2O)2(DMF)2](NO3)2·2DMF}n), which demonstrates high mixed protonic-electronic conductivity at room temperature. Through detailed analysis, we unravel the coupled transport mechanism, offering insights for the rational design of high-performance MPECs. We demonstrate the practical implications of this mechanism by examining the humidity-dependent synaptic plasticity of Ni-BAND, showcasing how MPECs can expand into traditional MIEC applications while leveraging their unique proton-mediated advantages.

Date: 2025
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DOI: 10.1038/s41467-025-56541-2

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