Houttuynia-derived nitrogen-doped hierarchically porous carbon for high-performance supercapacitor. (May 2020)

• Record Type: Journal Article
• Authors: Shang, Zhen; An, Xingye; Zhang, Hao; Shen, Mengxia; Baker, Fiona; Liu, Yuxin; Liu, Liqin; Yang, Jian; Cao, Haibing; Xu, Qingliang; Liu, Hongbin; Ni, Yonghao
• Is Part Of: Carbon. Volume 161(2020)
• Page Start: 62
• Page End: 70
• Publication Date: 2020-05
• Subjects: Houttuynia -- Nitrogen-doped -- 3D porous nanostructure -- Carbon material -- Supercapacitor; Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2020.01.020
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: Three-dimensional (3D) heteroatom-doped nanostructured carbon materials have gained extensive attention because of their tremendous potential for enhancing supercapacitor performance. Herein, based on a mild carbonization/activation process we successfully developed green/sustainable 3D hierarchically porous nitrogen-doped nanostructure carbon (N–HNC) materials from houttuynia biomass, showing high specific capacitance and high cyclic stability. The as-prepared houttuynia-derived porous carbon material shows a unique flower-like architecture with well-distributed micro/meso pores and a high specific surface area of 2090 m 2 /g. The assembled supercapacitor based on N–HNC sample shows superior specific capacitance (473.5 F/g at 1 A/g) and remains over 50% of specific capacitance at 20 A/g. The N–HNC based symmetric supercapacitor, constructed with a two-electrode configuration, shows an energy density of 15.99 Wh/kg at 500 W/kg and outstanding capacitance retention of 95.74% even after 10, 000 charge-discharge cycles at 10 A/g in an aqueous 6 M KOH electrolyte system. The results highlight the potential of the 3D porous N-doped hierarchical nano-structural carbon materials from houttuynia biomass as candidate electrodes for supercapacitor applications. This study provides an example of using the inherent framework structure of biomass as a precursor to synthesize hierarchically porous nitrogen-doped nanostructure for high-performance supercapacitor applications. Graphical abstract: Image 1