Distinguished Roles of Nitrogen‐Doped Sp2 and Sp3 Hybridized Carbon on Extraordinary Supercapacitance in Acidic Aqueous Electrolyte

• DOI: 10.1002/adma.202310422
• Publication Date: 2023-12-16T04:03:38Z
• Authors: Jun Li; Zhenhai Xia; Xiaowei Wang; Cheng Feng; Qingcheng Zhang; Xi'an Chen; Yun Yang; Shun Wang; Huile Jin
• Keywords: Carbon fibers; Gravimetric analysis

Abstract The acidic aqueous supercapacitors have been found to deliver appealing capacitive properties due fast ion diffusion caused by the applied smallest size of hydrion. However, their practical applications are largely inhibited narrow electrochemical stability window water (1.23 V). Herein, A nitrogen‐enriched porous carbon materials (RNOPCs) is reported, consisting varied nitrogen doping bonded on sp 2 and 3 sites, which capable stimulating a wider potential up 1.4 V thus resulting in great enhancement performance electrolytes. Together with improved electrical conductivity preferable hydrion diffusion, RNOPCs exhibit an ultrahigh volumetric capacitance (1084 F cm −3 ) 0.5 M H SO 4 . Besides, fully packed RNOPCs‐based symmetrical supercapacitor can high gravimetric energy density 31.8 Wh Kg −1 54.3 L respectively, approaching those lead acid batteries (25–35 ). first‐principles calculations reveal that lone pair electrons doped be delocalized its neighboring atoms, improving charge uptakes overpotentials. Such facile scale‐up production carbon‐based bridge gap between traditional