Highly efficient photo-supercapacitor based on Mg-doped NiOx/SnO2 p-n heterojunction

IF 5.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-01-30 DOI:10.1016/j.jallcom.2025.178920

Ahmad Saraei , Ali Esfandiar , Nima Taghavinia

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引用次数: 0

Abstract

A photo-supercapacitor is a device that captures and stores renewable solar energy. Metal oxide-based photo-supercapacitors with p-n junctions have attracted significant attention for application in self-powered electronic devices. In this study, we utilized a NiO_x/SnO₂ p-n heterojunction electrode to achieve a capacitance of 180 mF/cm² in a 1 M aqueous KOH solution at a current density of 1 mA/cm². The n-type layer was synthesized from SnO₂ nanostructures via a simple hydrothermal method on an FTO substrate, while the p-type layer was created by forming a NiO_x thin film through spin-coating. When exposed to visible light, Mg doping in the p-type layer enhanced the supercapacitor electrode performance. The capacitance, cathodic, and anodic current densities of the NiO_x/SnO₂ p-n heterojunction increased by 60 %, 62 %, and 65 %, respectively, compared to the SnO₂ electrode. This approach presents a novel design and material composition for photo-supercapacitor fabrication, enabling the development of single-body structures with comparable performance to more complex configurations.

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.