2D CdPS<sub>3</sub>-based versatile superionic conductors.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 37414802.
- Also identified by DOI 10.1038/s41467-023-39725-6 and PMC identifier 10326001.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Ion transport in nanochannels is crucial for applications in life science, filtration, and energy storage. However, multivalent ion transport is more difficult than the monovalent analogues due to the steric effect and stronger interactions with channel walls, and the ion mobility decreases significantly as temperature decreases. Although many kinds of solid ionic conductors (SICs) have been developed, they can attain practically useful conductivities (0.01 S cm<sup>-1</sup>) only for monovalent ions above 0 °C. Here, we report a class of versatile superionic conductors, monolayer CdPS<sub>3</sub> nanosheets-based membranes intercalated with diverse cations with a high density up to ∼2 nm<sup>-2</sup>. They exhibit unexpectedly similar superhigh ion conductivities for monovalent (K<sup>+</sup>, Na<sup>+</sup>, Li<sup>+</sup>) and multivalent ions (Ca<sup>2+</sup>, Mg<sup>2+</sup>, Al<sup>3+</sup>), ∼0.01 to 0.8 S cm<sup>-1</sup> in the temperature range of -30 ‒ 90 °C, which are one to two orders of magnitude higher than those of the corresponding best SICs. We reveal that the high conductivity originates from the concerted movement of high-density cations in the well-ordered nanochannels with high mobility and low energy barrier. Our work opens an avenue for designing superionic conductors that can conduct various cations and provides possibilities for discovering unusual nanofluidic phenomena in nanocapillaries.