超级电容器
材料科学
电容
光电流
电极
光敏性
光电子学
纳米颗粒
纳米技术
电容感应
可见光谱
化学
电气工程
工程类
物理化学
作者
Wen Long,Tongling Li,Qianqian Luo,Weilong Li,Heng Zhang,Hongwei Tan,Ren Z
出处
期刊:Small
[Wiley]
日期:2023-11-22
标识
DOI:10.1002/smll.202306753
摘要
Photosensitive supercapacitors incorporate light-sensitive materials on capacitive electrodes, enabling solar energy conversion and storage in one device. In this study, heterogeneous structures of rod-shaped ZnO decorated with Ce2 S3 nanoparticles on nickel foam (ZnO@Ce2 S3 /NF) are synthesized using a two-step hydrothermal method as photosensitive supercapacitor electrodes for capacitance enhancement under visible light. The formation of ZnO@Ce2 S3 heterogeneous structures is confirmed using various structural characterization techniques. The area-specific capacitance of the ZnO@Ce2 S3 /NF composite electrode increased from 1738.1 to 1844.0 mF cm-2 after illumination under a current density of 5 mA cm-2 , which is 2.4 and 2.8 times higher than that of ZnO and Ce2 S3 electrodes under similar conditions, respectively, indicating the remarkable light-induced capacitance enhancement performance. The ZnO@Ce2 S3 /NF electrode also exhibits a higher photocurrent and photovoltage than the two single electrodes, demonstrating its excellent photosensitivity. The improved capacitance performance and photosensitivity under illumination are attributed to the well-constructed energy-level structure, which stimulates the flow of photogenerated electrons from the outer circuit and the involvement of photogenerated holes in the resulting surface-controlled capacitance. In addition, the assembled ZnO@Ce2 S3 /NF-based hybrid supercapacitor exhibits a great energy density of 145.0 mWh cm-2 under illumination. This study provides a novel strategy for the development of high-performance solar energy conversion/storage devices.
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