Dual‐Functional Z‐Scheme TiO2@MoS2@NC Multi‐Heterostructures for Photo‐Driving Ultrafast Sodium Ion Storage

Abstract Exploiting dual‐functional photoelectrodes to harvest and store solar energy is a challenging but efficient way for achieving renewable energy utilization. Herein, multi‐heterostructures consisting of N‐doped carbon coated MoS 2 nanosheets supported by tubular TiO 2 with photoelectric conversion and electronic transfer interfaces are designed. When a photo sodium ion battery (photo‐SIB) is assembled based on the heterostructures, its capacity increases to 399.3 mAh g −1 with a high photo‐conversion efficiency of 0.71 % switching from dark to visible light at 2.0 A g −1 . Remarkably, the photo‐SIB can be recharged by light only, with a striking capacity of 231.4 mAh g −1 . Experimental and theoretical results suggest that the proposed multi‐heterostructures can enhance charge transfer kinetics, maintain structural stability, and facilitate the separation of photo‐excited carriers. This work presents a new strategy to design dual‐functional photoelectrodes for efficient use of solar energy.