title: Fabrication of Nitrogen-Doped Hollow Mesoporous Spherical Carbon Capsules for Supercapacitors.
abstract: A novel "dissolution-capture" method for the fabrication of nitrogen-doped hollow mesoporous spherical carbon capsules (N-HMSCCs) with high capability for supercapacitor is developed. The fabrication process is performed by depositing mesoporous silica on the surface of the polyacrylonitrile nanospheres, followed by a dissolution-capture process occurring in the polyacrylonitrile core and silica shell. The polyacrylonitrile core is dissolved by dimethylformamide treatment to form a hollow cavity. Then, the polyacrylonitrile is captured into the mesochannel of silica. After carbonization and etching of silica, N-HMSCCs with uniform mesopore size are produced. The N-HMSCCs show a high specific capacitance of 206.0 F g(-1) at a current density of 1 A g(-1) in 6.0 M KOH due to its unique hollow nanostructure, high surface area, and nitrogen content. In addition, 92.3% of the capacitance of N-HMSCCs still remains after 3000 cycles at 5 A g(-1). The "dissolution-capture" method should give a useful enlightenment for the design of electrode materials for supercapacitor.
authors.affiliation: College of Chemistry and Pharmaceutical Engineering, Hebei University of Science and Technology , Shijiazhuang 050018, China.
authors.forename: Aibing
authors.initials: A
authors.lastname: Chen
authors.affiliation: College of Chemistry and Pharmaceutical Engineering, Hebei University of Science and Technology , Shijiazhuang 050018, China.
authors.forename: Kechan
authors.initials: K
authors.lastname: Xia
authors.affiliation: Department of Resources and Environmental Engineering, Xingtai Polytechnic College , Xingtai 054000, China.
authors.forename: Linsong
authors.initials: L
authors.lastname: Zhang
authors.affiliation: College of Chemistry and Pharmaceutical Engineering, Hebei University of Science and Technology , Shijiazhuang 050018, China.
authors.forename: Yifeng
authors.initials: Y
authors.lastname: Yu
authors.affiliation: College of Chemistry and Pharmaceutical Engineering, Hebei University of Science and Technology , Shijiazhuang 050018, China.
authors.forename: Yuetong
authors.initials: Y
authors.lastname: Li
authors.affiliation: College of Chemistry and Pharmaceutical Engineering, Hebei University of Science and Technology , Shijiazhuang 050018, China.
authors.forename: Hexu
authors.initials: H
authors.lastname: Sun
authors.affiliation: College of Chemistry and Pharmaceutical Engineering, Hebei University of Science and Technology , Shijiazhuang 050018, China.
authors.forename: Yuying
authors.initials: Y
authors.lastname: Wang
authors.affiliation: College of Chemistry and Pharmaceutical Engineering, Hebei University of Science and Technology , Shijiazhuang 050018, China.
authors.forename: Yunqian
authors.initials: Y
authors.lastname: Li
authors.affiliation: College of Chemistry and Pharmaceutical Engineering, Hebei University of Science and Technology , Shijiazhuang 050018, China.
authors.forename: Shuhui
authors.initials: S
authors.lastname: Li