Photo-Rechargeable Sodium-Ion Batteries with a Two-Dimensional MoSe<sub>2</sub> Crystal Cathode.
basic_science · Level V
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- Record sourced from PubMed, PMID 39810611.
- Also identified by DOI 10.1021/acs.nanolett.4c03471 and PMC identifier 11803744.
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Abstract
Combining energy harvesting with energy storage systems in a single device could offer great advantages for continuous power supply in both indoor and outdoor electric applications. In this work, we demonstrate a photochargeable sodium-ion battery (PSIB) based on a photoactive cathode of two-dimensional crystals of MoSe<sub>2</sub>. This photocathode enables spontaneous photodriven charging of a sodium-ion battery cathode under illumination and an increase in the reversible capacity to 29% at 600 mA g<sup>-1</sup> compared to that under dark conditions during galvanostatic cycling. Exposure of MoSe<sub>2</sub> to light drives the Na<sup>+</sup> extraction, prompted by photogenerated holes, and accelerates the charge transfer kinetics with improved ion diffusion, which leads to an increased capacity. Moreover, the PSIB can be charged to 1.68 V under light illumination without applying an external current. Our work paves the way for the development of light-driven rechargeable batteries, which can benefit off-grid technologies such as the Internet of Things.