Oxygen-containing hierarchically porous carbon materials derived from wild jujube pit for high-performance supercapacitor

• Published in: Electrochimica acta Vol. 231; pp. 417 - 428
• Main Authors: Sun, Kailing, Yu, Shishun, Hu, Zhongliang, Li, Zhaohui, Lei, Gangtie, Xiao, Qizhen, Ding, Yanhuai
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 20.03.2017; Elsevier BV
• Subjects: Annealing; biomass; Capacitance; Carbon; Density; Electrochemical analysis; Electrodes; Electrolytic cells; Energy consumption; Flux density; hierarchical; Oxygen; porous carbon; Porous materials; Specific surface; Studies; supercapacitor; Supercapacitors; wild jujube pits; porous carbon; biomass; hierarchical; wild jujube pits; supercapacitor
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2017.02.078

[Display omitted] •Wild jujube pits (WJPs) were utilized to prepare hierarchically porous carbon (HPC) material.•The HPC sample that annealed at 800°C displayed superior electrochemical properties.•It possessed an ultra-high specific surface area of 2438m2g−1.•The WJPs could act as a novel renewable biomass precursor to synthesize the HPC material. Hierarchically porous carbon (HPC) materials with rich oxygen-containing groups at the surface were prepared by a facile one-pot approach using wild jujube pit (WJP) as the biomass precursor. Effect of annealing temperature on the texture and electrochemical properties of the obtained HPC materials was investigated. After the WJP is annealed at 800°C, the resulting HPC sample (WJC-800) contains 6.7% oxygen element and displays an ultra-high specific surface area (2438m2g−1) and a high pore volume (1.00cm3g−1). The WJC-800 sample possesses interconnected micro-, meso- and macro-pores, and such a structure is beneficial to enhance its electrochemical properties. In a three-electrode configuration, the WJC-800-derived electrode can deliver a specific capacitance of 398Fg−1 (95.5Fcm−3) at 0.5Ag−1, and retain 345Fg−1 (82.8Fcm−3) (86.7% of that at 0.5Ag−1) even at 20Ag−1. The capacitance retention of the assembled symmetric supercapacitor cell remains 97% and 87% in the 6M KOH and 1M Na2SO4 electrolyte after 10,000 cycles at 5Ag−1, respectively. The symmetric supercapacitor cells using the 1M Na2SO4 electrolyte attains a high energy density of 13.33Whkg−1 at the power density of 16kWkg−1. The results indicate that the WJP can act as a novel and appropriate biomass precursor to prepare the low-cost HPC materials for high-performance supercapacitor.