Superionic Conduction in One-Dimensional Nanostructures

Abstract

Nanostructuring has become a powerful tool for tuning the electronic properties of materials and enhancing transport. As an example of relevance to next-generation battery technologies, nanocrystals have shown promise for realizing fast-ion conduction in solids; however, dissipationless ion transport over extended length scales is hindered by lossy interfaces formed between nanocrystals in a solid. Here we address this challenge by exploiting one-dimensional nanostructures for ion transport. Superionic conduction, with a record-high ionic conductivity of ∼4 S/cm at 150 °C, is demonstrated in solid electrolytes fabricated from nanowires of the earth-abundant solid copper selenide. This quasi-one-dimensional ionic conductivity is ∼5× higher than that in bulk cuprous selenide. Nanoscale dimensions in the radial direction lower ion-hopping barriers, while mesoscopically long, interface-free transport paths are available for ion transport in the axial direction. One-dimensional nanostructures can exceptionally boost solid-state devices that rely on ion transport.

Compressibility Studies of Copper Selenides Obtained by Cation Exchange Reaction Revealing the New CsCl Phase

“…Both the zinc-blende and the wurtzite CdSe NCs were shown to be excellent hosts for synthesis of NCs with different compositions via cation exchange reactions (CERs) enabling the fabrication of phases that cannot be prepared via direct synthesis . Cation exchange reactions under ambient conditions are recognized as a promising postsynthetic strategy to tune the chemical composition , of NCs maintaining morphology, − structure, and dimensions. − CERs enable the design of new complex structures including those with metastable phases , through the preservation of the anionic framework . The extent of the CER as well as the resulting structures depends , on the chemical nature of the guest cation, their ionic radii and oxidation states, and the choice of ligands and solvation environments .…”

One-Dimensional High-Entropy Compounds

“…One-dimensional (1D) nanostructures exhibit quantum confinement effects owing to their reduced dimensions, − resulting in discrete energy levels and reduced scattering of electrons along the length of the nanowire. Particularly in subnano diameters, electrons can be shared along the axial structures and give rise to long-range electron delocalization .…”

Compressibility Studies of Copper Selenides Obtained by Cation Exchange Reaction Revealing the New CsCl Phase

“…Both zinc blende and wurtzite CdSe NCs were shown to be an excellent hosts for synthesis of NCs with different compositions via cation exchange reactions (CERs) enabling the fabrication of phases that cannot be prepared via direct synthesis 16 . Cation exchange reactions 25 under ambient conditions are recognized as a promising post-synthetic strategy to tune the chemical composition 17,18 of NCs maintaining morphology [19][20][21][22] , structure and dimensions [23][24][25] . CERs enable design of new complex structures including those with metastable phases 20,26 through the https://doi.org/10.26434/chemrxiv-2023-qfhm2 ORCID: https://orcid.org/0000-0003-3257-7317 Content not peer-reviewed by ChemRxiv.…”