Laser-engineered oxygen-vacancy-rich CeO2/graphene heterostructures for high-performance planar micro-supercapacitors
Abstract
The planar miniature supercapacitors (PMSCs) based on laser-induced graphene (LIG) are promising miniaturized energy storage systems, yet their practical deployment is constrained by low areal capacitance and energy density. Herein, we report a synergistic strategy to boost the energy storage performance of LIG PMSCs by integrating the cerium dioxide (CeO2) nanoparticles into the three-dimensional (3D) LIG framework. Laser irradiation concurrently converts polyimide (PI) to 3D graphene and introduces abundant oxygen vacancies in CeO2, enhancing redox-active sites and electron transport. The optimized LIG/CeO2 PMSCs exhibit an areal capacitance of 27.54 mF cm−2 at 2 mV s−1 and delivers energy density of 3.98 μWh cm−2. This enhancement stems from the oxygen vacancies of CeO2, CeO2–LIG π-electron orbital interactions, and strong interfacial coupling—validated by density functional theory calculations to accelerate charge storage kinetics. This work provides a scalable route to high-performance LIG-based PMSCs for miniature energy storage with improved energy density.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (10)
Hailong Shen
Jianghai Li
Guangxi Novel Battery Materials Research Center of Engineering Technology, Guangxi Key Laboratory of Electrochemical Energy Materials, Carbon Peak and Neutrality Science and Technology Development Institute, School of Physics Science and Technology, Guangxi University , Nanning 530004,
Jiaheng Xu
Department of Gastroenterology, Shanghai Institute of Pancreatic Diseases, Changhai Hospital, Navy/Second Military Medical University
Kaiyang Gao
Guangxi Novel Battery Materials Research Center of Engineering Technology, Guangxi Key Laboratory of Electrochemical Energy Materials, Carbon Peak and Neutrality Science and Technology Development Institute, School of Physics Science and Technology, Guangxi University , Nanning 530004,
Siyi Liu
Ziyuan Xu
Guangxi Novel Battery Materials Research Center of Engineering Technology, Guangxi Key Laboratory of Electrochemical Energy Materials, Carbon Peak and Neutrality Science and Technology Development Institute, School of Physics Science and Technology, Guangxi University , Nanning 530004,
Xianqing Liang
Guangxi Novel Battery Materials Research Center of Engineering Technology, Guangxi Key Laboratory of Electrochemical Energy Materials, Carbon Peak and Neutrality Science and Technology Development Institute, School of Physics Science and Technology, Guangxi University , Nanning 530004,
Wenzheng Zhou
Shuaikai Xu
Guangxi Key Laboratory of Electrochemical Energy Materials, Center on Nanoenergy Research, School of Physics Science and Technology, Guangxi University , Nanning 530004,
Haifu Huang
Guangxi Novel Battery Materials Research Center of Engineering Technology, Guangxi Key Laboratory of Electrochemical Energy Materials, Carbon Peak and Neutrality Science and Technology Development Institute, School of Physics Science and Technology, Guangxi University , Nanning 530004,