Improved conductivity and capacitance of interdigital carbon microelectrodes through integration with carbon nanotubes for micro-supercapacitors

• Published in: Nano research Vol. 9; no. 8; pp. 2510 - 2519
• Main Authors: Yang, Yanjuan, He, Liang, Tang, Chunjuan, Hu, Ping, Hong, Xufeng, Yan, Mengyu, Dong, Yixiao, Tian, Xiaocong, Wei, Qiulong, Mai, Liqiang
• Format: Journal Article
• Language: English
• Published: Beijing Tsinghua University Press 01.08.2016
• Subjects: Atomic/Molecular Structure and Spectra; Biomedicine; Biotechnology; Capacitance; Carbon; Carbon nanotubes; Chemistry and Materials Science; Chitosan; Condensed Matter Physics; Conductivity; Electrochemical analysis; Electrochemistry; Energy density; Energy storage; Flux density; Integration; Materials Science; Microelectrodes; Microelectromechanical systems; Micropatterning; Nanostructure; Nanotechnology; Nanotubes; Performance enhancement; Photolithography; Photoresists; Pyrolysis; Research Article; Supercapacitors; photolithography; pyrolysis; carbon nanotubes; microelectromechanical system (MEMS); supercapacitors
• ISSN: 1998-0124; 1998-0000
• DOI: 10.1007/s12274-016-1137-3

In the last decade, pyrolyzed-carbon-based composites have attracted much attention for their applications in micro-supercapacitors. Although various methods have been investigated to improve the performance of pyrolyzed carbons, such as conductivity, energy storage density and cycling performance, effective methods for the integration and mass-production of pyrolyzed-carbon- based composites on a large scale are lacking. Here, we report the development of an optimized photolithographic technique for the fine micropatterning of photoresist/chitosan-coated carbon nanotube （CHIT-CNT） composite. After subsequent pyrolysis, the fabricated carbon/CHIT-CNT microelectrode-based micro-supercapacitor has a high capacitance （6.09 mF.cm-2） and energy density （4.5 mWh.cm-3） at a scan rate of 10 mV.s-L Additionally, the micro-supercapacitor has a remarkable long-term cyclability, with 99.9% capacitance retention after 10,000 cyclic voltammetry cycles. This design and microfabrication process allow the application of carbon microelectromechanical system （C-MEMS）-based micro-supercapacitors due to their high potential for enhancing the mechanical and electrochemical performance of micro-supercapacitors.