Amorphous carbon interweaved mesoporous all-carbon electrode for wide-temperature range supercapacitors. (20th August 2022)

• Record Type: Journal Article
• Authors: Qiu, Yongting; Wang, Zhangxu; Jin, Mengmeng; Chen, Jiankang; Miao, Chunyang; Zhang, Shiming; Lai, Linfei
• Is Part Of: Electrochimica acta. Volume 424(2022)
• Publication Date: 2022-08-20
• Subjects: Mesoporous carbon -- Free-standing -- All-carbon electrode -- Supercapacitor -- Wide-temperature range; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2022.140622
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: The wide-temperature operation of supercapacitors is important for stable power output and a long lifespan under harsh conditions. However, supercapacitors for extreme conditions are still a big challenge because of the inevitable decline of performance caused by sluggish ion diffusion and increased unusable surface area contributed by micropores. Here we report a strategy for modification of carbon for wide-temperature operating supercapacitor electrodes. The polyvinylpyrrolidone creates conductive carbon bridges between CNTs and mesoporous carbon spheres (MCS) and produces a well-interconnected carbon network. The high conductivity and thermostable features of the all-carbon electrode lead to high capacitance retention at the temperature range from -40 °C to 80 °C. The binder-free all-carbon electrodes have excellent long-term stability with high mechanical durability under continuous bending from 0 to 360° This work demonstrates the construction of amorphous carbon interweaved all-carbon electrodes for supercapacitors with high performance at both low and high temperatures. Graphical abstract: Amorphous carbon interweaved CNTs and mesoporous carbon spheres as free-standing well-interconnected all-carbon electrode has shown temperature tolerant electrochemical properties. This design strategy enables the printing of microsupercapacitors on various insulating substrates for energy storage applications. Image, graphical abstract