Premium
Ni Foam‐Ni 3 S 2 @Ni(OH) 2 ‐Graphene Sandwich Structure Electrode Materials: Facile Synthesis and High Supercapacitor Performance
Author(s) -
Wang Xiaobing,
Hu Jiangjiang,
Su Yichang,
Hao Jin,
Liu Fanggang,
Han Shuang,
An Jian,
Lian Jianshe
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201605212
Subject(s) - graphene , materials science , electrode , supercapacitor , capacitance , electrochemistry , graphene foam , composite number , sulfidation , conductivity , composite material , substrate (aquarium) , chemical engineering , layer (electronics) , nanotechnology , metallurgy , graphene nanoribbons , chemistry , sulfur , engineering , oceanography , geology
A novel Ni foam‐Ni 3 S 2 @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 Ni 3 S 2 and Ni(OH) 2 were 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 Ni 3 S 2 , whereas the Ni 3 S 2 grown on Ni foam substrate mainly acts as a rough support bridging the Ni(OH) 2 and Ni foam. The graphene stabilized the Ni(OH) 2 and the electrochemical properties were effectively enhanced. The as‐synthesized NF‐NN‐G‐5mg electrode shows a high specific capacitance (2258 F g −1 at 1 A g −1 or 18.81 F cm −2 at 8.33 mA cm −2 ) and an outstanding rate property (1010 F g −1 at 20 Ag −1 or 8.413 F cm −2 at 166.6 mA cm −2 ). This result is around double the capacitance achieved in previous research on Ni 3 S 2 @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.