title: Large Areal Mass, Mechanically Tough and Freestanding Electrode Based on Heteroatom-doped Carbon Nanofibers for Flexible Supercapacitors.
abstract: A flexible and freestanding supercapacitor electrode with a N,P-co-doped carbon nanofiber network (N,P-CNFs)/graphene (GN) composite loaded on bacterial cellulose (BC) is first designed and fabricated in a simple, low-cost, and effective approach. The porous structure and excellent mechanical properties make the BC paper an ideal substrate that shows a large areal mass of 8 mg cm-2. As a result, the flexible N,P-CNFs/GN/BC paper electrode shows appreciable areal capacitance (1990 mF cm-2in KOH and 2588 mF cm-2in H2SO4electrolytes) without sacrificing gravimetric capacitance (248.8 F g-1and 323.5 F g-1), exhibits excellent cycling ability (without capacity loss after 20 000 cycles), and remarkable tensile strength (42.8 MPa). By direct coupling of two membrane electrodes, the symmetric supercapacitor delivers a prominent areal capacitance of 690 mF cm-2in KOH and 898 mF cm-2in H2SO4, and remarkable power/energy density (19.98 mW cm-2/0.096 mW h cm-2in KOH and 35.01 mW cm-2/0.244 mW h cm-2in H2SO4). Additionally, it shows stable behavior in both bent and flat states. These results promote new opportunities for N,P-CNFs/GN/BC paper electrodes as high areal performance, freestanding electrodes for flexible supercapacitors.
authors.affiliation: School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, P. R. China.
authors.forename: Rong
authors.initials: R
authors.lastname: Liu
authors.affiliation: School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, P. R. China.
authors.forename: Lina
authors.initials: L
authors.lastname: Ma
authors.affiliation: School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, P. R. China.
authors.forename: Jia
authors.initials: J
authors.lastname: Mei
authors.affiliation: School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, P. R. China.
authors.forename: Shu
authors.initials: S
authors.lastname: Huang
authors.affiliation: School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, P. R. China.
authors.forename: Shaoqiang
authors.initials: S
authors.lastname: Yang
authors.affiliation: School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, P. R. China.
authors.forename: Enyuan
authors.initials: E
authors.lastname: Li
authors.affiliation: School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, P. R. China.
authors.forename: Guohui
authors.initials: G
authors.lastname: Yuan
keywords: bacterial cellulose; conducting materials; doped-carbon nanofibers; flexible electrode; supercapacitors