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

Area of Science:

• Materials Science
• Solid-State Chemistry
• Nanotechnology

Background:

• Coupled proton-electron transport in mixed protonic-electronic conductors (MPECs) is poorly understood.
• MPECs hold potential for applications leveraging controlled proton diffusion via hydrogen-bond networks.
• Existing research in mixed ionic-electronic conductors (MIECs) highlights the need for advanced transport mechanisms.

Purpose of the Study:

• To investigate the fundamental mechanism of coupled proton-electron transport in MPECs.
• To design and synthesize a novel MPEC material with high conductivity.
• To explore the practical applications of MPECs in areas traditionally dominated by MIECs.

Main Methods:

• Synthesis of a hydrogen-bonded coordination polymer, Ni-BAND ({[Ni(bpy)(H2O)2(DMF)2](NO3)2·2DMF}n).
• Characterization of mixed protonic-electronic conductivity at room temperature.
• Analysis of the coupled transport mechanism and its relation to material structure.
• Investigation of humidity-dependent synaptic plasticity in Ni-BAND.

Main Results:

• Ni-BAND exhibits high mixed protonic-electronic conductivity at room temperature.
• The study elucidates the coupled proton-electron transport mechanism within the material.
• Humidity-dependent synaptic plasticity was observed, demonstrating functional applications.

Conclusions:

• The developed Ni-BAND material provides a platform for understanding coupled proton-electron transport.
• This research offers insights for the rational design of high-performance MPECs.
• MPECs can be integrated into traditional MIEC applications, offering unique proton-mediated advantages.