In-situ template cooperated with urea to construct pectin-derived hierarchical porous carbon with optimized pore structure for supercapacitor. (20th September 2020)

• Record Type: Journal Article
• Authors: Zhou, Yuhao; Ren, Xue; Du, Yueyao; Jiang, Yuchen; Wan, Jiafeng; Ma, Fangwei
• Is Part Of: Electrochimica acta. Volume 355(2020)
• Publication Date: 2020-09-20
• Subjects: Pectin -- Hierarchical porous carbon -- In-situ template -- Biopolymer -- Supercapacitor; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2020.136801
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: The 3D hierarchically porous carbon were synthesized via in-situ template and KOH activation from pectin. The activation temperature and the addition of urea can adjust the content of heteroatoms and the pore structure. The in-situ hard template can adjust the micropore/mesopores ratio. The high specific surface area and its suitable micropore/mesopores ratio are helpful to promote charge storage and ion transfer. Abstract: Pectin as a functional biopolymer has been successfully exploited to produce N/O co-doped 3D carbon architecture with hierarchical pores. A simple and novel in-situ template combining with KOH activation method is utilized to prepare porous carbon using calcium acetate as the template source and urea as a dopant. The in-situ CaCO3 template, activation temperature and urea additive have a significant influence on the morphology, pore structure and performance of porous carbon. The high specific surface area of NHPC-700 (2928 m 2 g − 1 ) and its suitable micropore/mesopores ratio are helpful to promote specific capacitance and rate performance. The NHPC-700 possesses the high specific capacitance of 338 F g − 1 at 1 A g − 1 and the excellent capacitance retention of 83% from 1 A g − 1 to 50 A g − 1 . Furthermore, the NHPC-700 symmetric supercapacitor shows an energy density of 22.4 Wh kg −1 at 880 W kg −1 in 1 M Na2 SO4 . The efficient use of pectin to synthesize functionalized hierarchical porous carbon materials has a broad development prospect. Graphical abstract: Image, graphical abstract