Regulating Charge Transfer in a Heterojunction Photoanode for Efficient Photo‐Charging of Zn‐Air/Sulfion Hybrid Batteries

作者：Lingqiao Kong, Jingyuan Qiao, Wang Li, Linhong Xia, Bingzhen Yan, Shuai Zhang, Qiushi Ruan, Zheng Ming Sun · 发表于：Advanced Functional Materials · 年份：2024 · DOI：10.1002/adfm.202417892 · 被引用次数：7 · 研究领域：Advanced Photocatalysis Techniques、Advanced battery technologies research、Electrocatalysts for Energy Conversion

Abstract Integrating sulfion‐rich wastewater purification with photo‐charging Zn‐Air batteries enables dual benefits for solar energy storage and environmental protection. However, photo‐charging efficiency is hindered by charge transfer issues. Here, the study synthesizes a CdS@CdIn 2 S 4 core–shell photoelectrode and uses Kelvin Probe Force Microscopy (KPFM) to probe surface potential changes and photo‐charge transfer under illumination. The outer shell (CdIn 2 S 4 ) exhibits upward band bending and a Conduction Band (CB) more negative than bulk CdS, leading to the accumulation of photoelectrons on the surface, which is detrimental to sulfion oxidation. Vacancy engineering aligns the Fermi energy of two materials, creating an optimal type‐II configuration that accumulates holes on the surface, thereby boosting the photo‐charging current density in Zn‐Air/Sulfion hybrid batteries by 18‐fold. A benchmark photo‐charging current density of 1.26 mA cm −2 is therefore achieved for Zn‐Air/Sulfion hybrid batteries. This work demonstrates the effectiveness of regulating charge transfer pathways in photo‐charging Zn‐Air/Sulfion hybrid batteries, showing potential applications in various photo‐assisted batteries.