Three-dimensional N-doped super-hydrophilic carbon electrodes with porosity tailored by Cu2O template-assisted electrochemical oxidation to improve the performance of electrical double-layer capacitors. Issue 5 (14th January 2021)

• Record Type: Journal Article
• Authors: Lv, Xiaowei; Ji, Shan; Linkov, Vladimir; Wang, Xuyun; Wang, Hui; Wang, Rongfang
• Is Part Of: Journal of materials chemistry. Volume 9:Issue 5(2021)
• Page Start: 2928
• Page End: 2936
• Publication Date: 2021-01-14
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0ta10294f
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Cu2 O was used as a porosity adjustment template and assisted electrochemical oxidation to prepare three-dimensional N-doped superhydrophilic carbon electrodes, showing excellent performance in electric double layer capacitors. Abstract : Three-dimensional (3D), binder-free, porous carbon-based electrodes exhibit high charge storage ability in electrical double-layer capacitors owing to their well-developed porous structures enhancing mass transfer and achieving relatively high electroconductivity. A 3D N-doped carbon electrode with abundant oxygen-containing functional groups was prepared by depositing a PDA-derived N-doped carbon layer and electrochemical oxidation using a porosity-regulating in situ generated Cu2 O sacrificial template. The optimized electrode demonstrated a high specific capacitance of 2852 mF cm −2 at a current density of 1 mA cm −2 and good rate capability. The material was used as an electrode in a symmetric capacitor, exhibiting an energy density of 16.4 mW h cm −3 at a power density of 180 mW cm −3, which maintained 89% of its value after 15 000 cycles. This study describes a new method of manufacturing high-performance porous electrodes suitable for practical application in electric double-layer capacitors.