title: Ni Foam-Ni3S2@Ni(OH)2-Graphene Sandwich Structure Electrode Materials: Facile Synthesis and High Supercapacitor Performance.
abstract: A novel Ni foam-Ni3S2@Ni(OH)2-graphene sandwich-structured electrode (NF-NN-G) with high areal mass loading (8.33 mg cm-2) has been developed by sulfidation and hydrolysis reactions. The conductivity of Ni3S2and Ni(OH)2were both improved. The upper layer of Ni(OH)2, covered with a thin graphene film, is formed in situ from the surface of the lower layer of Ni3S2, whereas the Ni3S2grown on Ni foam substrate mainly acts as a rough support bridging the Ni(OH)2and Ni foam. The graphene stabilized the Ni(OH)2and the electrochemical properties were effectively enhanced. The as-synthesized NF-NN-G-5mg electrode shows a high specific capacitance (2258 F g-1at 1 A g-1or 18.81 F cm-2at 8.33 mA cm-2) and an outstanding rate property (1010 F g-1at 20 Ag-1or 8.413 F cm-2at 166.6 mA cm-2). This result is around double the capacitance achieved in previous research on Ni3S2@Ni(OH)2/3DGN composites (3DGN=three-dimensional graphene network). In addition, the as-fabricated NF-NN-G-5mg composite electrode has an excellent cycle life with no capacitance loss after 3000 cycles, indicating a potential application as an efficient electrode.
authors.affiliation: Key Laboratory of Automobile Materials, Ministry of Education, Department of Materials Science and Engineering, Jilin University, Changchun, 130022, P.R. China.
authors.forename: Xiaobing
authors.initials: X
authors.lastname: Wang
authors.affiliation: Key Laboratory of Automobile Materials, Ministry of Education, Department of Materials Science and Engineering, Jilin University, Changchun, 130022, P.R. China.|Advanced Materials Research, Northwest Institute for Non-ferrous Metal Research, Xian, 710049, P.R. China.
authors.forename: Jiangjiang
authors.initials: J
authors.lastname: Hu
authors.affiliation: Key Laboratory of Automobile Materials, Ministry of Education, Department of Materials Science and Engineering, Jilin University, Changchun, 130022, P.R. China.
authors.forename: Yichang
authors.initials: Y
authors.lastname: Su
authors.affiliation: Key Laboratory of Automobile Materials, Ministry of Education, Department of Materials Science and Engineering, Jilin University, Changchun, 130022, P.R. China.
authors.forename: Jin
authors.initials: J
authors.lastname: Hao
authors.affiliation: Key Laboratory of Automobile Materials, Ministry of Education, Department of Materials Science and Engineering, Jilin University, Changchun, 130022, P.R. China.
authors.forename: Fanggang
authors.initials: F
authors.lastname: Liu
authors.affiliation: Key Laboratory of Automobile Materials, Ministry of Education, Department of Materials Science and Engineering, Jilin University, Changchun, 130022, P.R. China.
authors.forename: Shuang
authors.initials: S
authors.lastname: Han
authors.affiliation: Key Laboratory of Automobile Materials, Ministry of Education, Department of Materials Science and Engineering, Jilin University, Changchun, 130022, P.R. China.
authors.forename: Jian
authors.initials: J
authors.lastname: An
authors.affiliation: Key Laboratory of Automobile Materials, Ministry of Education, Department of Materials Science and Engineering, Jilin University, Changchun, 130022, P.R. China.
authors.forename: Jianshe
authors.initials: J
authors.lastname: Lian
keywords: conducting materials; conductivity; electrochemical properties; graphene; sandwich architecture; supercapacitor