N/O co-doped hierarchically porous carbon with three-dimensional conductive network for high-performance supercapacitors

Preparation of N/O-codoped quinoline pitch-based porous carbons for high-quality supercapacitor electrodes

“…Specifically, the C 1s peak was fitted into four peaks centered at 284.6, 285.3, 286.5 and 289.2 eV, corresponding to the C types of CQC/C-C, C-N, CQO and C-O. 5,27 The O 1s peak was subdivided into three peaks located at 531.4, 532.5 and 533.4 eV, matching the O types of carboxylic CQO or benzoquinone, etheric C-O and phenolic O-H. [31][32][33] The N 1s peak can be split into four peaks positioned at 389.0, 400.1, 400.6 and 401.9 eV, 27 belonging to the N types of N-6, N-5, N-Q and N-O, respectively. The atomic contents of various types of O and N were also shown in Table 3.…”

“…14,19,27 At present, codoping is gaining huge attention considering the synergistic effect of distinct heteroatoms, where doping N/O is viewed as the most exciting strategy to boost the capacity performance of porous carbon. [28][29][30][31] N and O heteroatoms on the surface of porous carbon mainly exist in the form of -NH 2 , -NO 2 , -CONH 2 and -OH, -CHO, -COOH, respectively, which are easily introduced by its post-treatment. These groups can significantly improve the hydrophilicity of carbon materials, thus ensuring the rapid migration of electrolyte ions and reducing the electrode/ electrolyte interfacial impedance.…”

“…(2) KOH activation readily introduces oxygen heteroatoms into porous carbon. 31 Herein, the microstructures and electrochemical performances of the carbon samples obtained at different activation temperatures (650, 700, 750 and 800 1C) have been carefully investigated in order to reveal their relationships. The resultant QLP-based porous carbons possess super-large surface areas (42500 m 2 g À1 ), high O-doping (8-10 at%) and moderate N-doping (1-4 at%), and an outstanding capacitive ability (250-452 F g À1 at 0.5 A g À1 ).…”

Self‐doping porous carbon materials synthesis from bio‐wastes sodium lignosulfonate with high performance for supercapacitors

“…14,15 Heteroatom doping can effectively promote the surface wettability, conductivity and polarity of porous carbon material, as well as provide additional pseudocapacitance to achieve higher specific capacitance for supercapacitor. 16,17 Various biomass and its derivatives, including cellulose, 18,19 chitin, 20 lignin, [21][22][23] chitosan, 24 willow catkin, 25 sodium alginate, 26,27 tobacoo, 28 bagasse wastes, 12 etc., have been used to prepare porous carbon materials. Lignin is a kind of amorphous aromatic polymers and natural macromolecular organism only second to cellulose inside plant, with a content of 15%-30%.…”

Chitosan-Based Synthesis of O, N, and P Codoped Hierarchical Porous Carbon as Electrode Materials for Supercapacitors

“…Modifying the pore structure of a carbon material to facilitate ion transport is a focus in the field of carbon-based electrodes . In addition, doping heteroatoms into a carbon framework can enhance the surface hydrophilicity, effectively reduce the contact resistance between electrolyte ions and carbon surface, and improve the ion transport efficiency. − The heteroatom provides functional groups for the redox reaction, which further improves the capacitance performance. , Previous reports demonstrated that N doping, N,S codoping, , and N, O codoping greatly improves the capacitive performance of porous carbon.…”