Nitrogen and oxygen co-doped carbon networks with a mesopore-dominant hierarchical porosity for high energy and power density supercapacitors. (1st June 2017)

• Record Type: Journal Article
• Authors: He, Duanpeng; Niu, Jin; Dou, Meiling; Ji, Jing; Huang, Yaqin; Wang, Feng
• Is Part Of: Electrochimica acta. Volume 238(2017)
• Page Start: 310
• Page End: 318
• Publication Date: 2017-06-01
• Subjects: Nitrogen and oxygen co-doped carbons -- mesopore-dominant structure -- High energy density -- High power density -- Supercapacitor; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2017.03.218
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: In-situ nitrogen and oxygen co-doped carbon networks with a mesopore-dominant hierarchical porosity were prepared from cattle bone and exhibited superior performance as electrode material for high energy and power density supercapacitor. Abstract: Nitrogen and oxygen co-doped hierarchical porous carbon (N, O-HPC) networks has been synthesized using cattle bones as precursors via pre-carbonization and carbonization combined with KOH activation. The effects of carbonization and activation temperature on the physiochemical and electrochemical performances of the N, O-HPCs were systematically studied. The N, O-HPC obtained at 850 °C (referred to as N, O-HPC-850) possesses a mesopore-dominant hierarchical porous network with a large specific surface area (2520 m 2 g −1 ), a relatively high content of N (1.56%) and O (10.2%) and a good electrical conductivity (421.9 S m −1 ). As it is used as supercapacitor electrode material, N, O-HPC-850 exhibits a large specific capacity (444 F g −1 at a scan rate of 5 mV s −1 and 435 F g −1 at a current density of 0.1 A g −1, respectively) and good rate performance (252 F g −1 at a scan rate of 500 mV s −1 and 309 F g −1 at a current density of 20 A g −1, respectively) in 6 M KOH solution. Moreover, the assembled symmetric supercapacitor based on N, O-HPC-850 electrode delivers the energy density of 30.3 and 9.7 Wh kg −1 at the power density of 0.341 and 43.8 kW kg −1, respectively, and exhibits a good cycling stability with a capacitance retention of 97.5% after 20000 cycles in 1 M Na2 SO4 solution.