Photo-Rechargeable Sodium-Ion Batteries with a Two-Dimensional MoSe<sub>2</sub> Crystal Cathode
Gang Cheng, Zhenyu Guo, Goli Nagaraju, Filip Podjaski, Kaitian Zheng, Jinglin Jiang, Sami Ramadan, Gwilherm Kerherve, Stefano Tagliaferri, Mauro Och, N. Klein, Mattia Cattelan, Stefano Agnoli, Maria‐Magdalena Titirici, Cecilia Mattevi
Abstract
High Resolution Image Download MS PowerPoint Slide 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 2 . 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 –1 compared to that under dark conditions during galvanostatic cycling. Exposure of MoSe 2 to light drives the Na + 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.