Biowaste-derived 3D honeycomb-like porous carbon with binary-heteroatom doping for high-performance flexible solid-state supercapacitors. Issue 1 (6th December 2017)

• Record Type: Journal Article
• Authors: Liu, Yuxi; Xiao, Zechuan; Liu, Yongchang; Fan, Li-Zhen
• Is Part Of: Journal of materials chemistry. Volume 6:Issue 1(2018)
• Page Start: 160
• Page End: 166
• Publication Date: 2017-12-06
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c7ta09055b
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : N and S-co-doped activated corncob sponge of honeycomb-like porous carbon with the interconnected micro-meso-macropores and the large specific surface area was evaluated as an electrode material for flexible solid-state supercapacitors, exhibiting high specific capacitance, high energy–power density, and great cyclic stability. Abstract : Corncob sponge is a type of agricultural abandoned byproduct and abundant around the world. Herein, a facile one-pot carbonization and activation method is developed to convert corncob sponge into three-dimensional (3D) interconnected honeycomb-like porous carbon, followed by an effective binary-heteroatom doping to fabricate nitrogen and sulfur co-doped activated corncob sponge (denoted as N, S-ACS). The resultant products possess a high accessible surface area (1874 m 2 g −1 ) induced by the 3D honeycomb-like framework and a highly porous structure that benefits a large ion storage and a rapid ion transfer. In addition to the electrical double layer capacitance, heteroatom doping evokes faradic contribution. N, S-ACS demonstrates a remarkable specific capacitance of 404 and 253 F g −1 at the current densities of 0.1 and 10 A g −1 in a 6 mol L −1 KOH electrolyte, respectively, along with a high cycling stability with only 1% loss over 10 000 cycles. Furthermore, the assembled symmetric flexible solid-state supercapacitors with the electrode of N, S-ACS and the electrolyte of a PVA/KOH gel display a high integrated energy–power density of 30 W h kg −1 at 8 kW kg −1 and a 99% capacitance retention after 10 000 cycles at 3 A g −1 . The fascinating performance significantly endows N, S-ACS with great prospects as a supercapacitor electrode.