Salt-assisted pyrolysis of covalent organic frameworks to porous heteroatom-doped carbons for supercapacitive energy storage. Issue 47 (3rd October 2019)

• Record Type: Journal Article
• Authors: Yan, Dongwan; Wu, Yang; Kitaura, Ryo; Awaga, Kunio
• Is Part Of: Journal of materials chemistry. Volume 7:Issue 47(2019)
• Page Start: 26829
• Page End: 26837
• Publication Date: 2019-10-03
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9ta05150c
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Highly porous heteroatom-doped carbons with ultra-high supercapacitive performance are prepared by salt-assisted pyrolysis of covalent organic frameworks. Abstract : Supercapacitors have attracted intensive research interest due to their advantages including longer cycling ability and higher power density. Porous heteroatom-doped carbons (PHCs) have been regarded as a class of promising electrode materials for supercapacitors because of their unique porous, electronic and chemical properties. However, synthesis of PHCs with hierarchical mesoporous/microporous structures and ultra-high porosity and electrochemical performance remains a great research challenge. In this research, two oxygen and nitrogen co-doped PHCs (denoted as ONC-T1s) are prepared via a salt-assisted pyrolysis method using covalent organic frameworks (COFs) as the precursor. ONC-T1s show a hierarchical porous structure with an ultra-high specific surface area (up to 3451 m 2 g −1 ). The ONC-T1-850-based supercapacitor exhibits a high specific capacitance of 1711 F g −1 at 1 A g −1, an ultra-fast charge–discharge rate up to 500 A g −1 with a specific capacitance of 856 F g −1, and excellent stability. This work establishes a promising strategy for preparation of PHCs using COFs or other porous organic polymers as precursors and demonstrates the great potential of PHC-based supercapacitors.