Anion-exchange reaction synthesized CoNi2S4 nanowires for superior electrochemical performances

作者：Hu, Qingqing; Ma, Wenqin; Liang, Gan; Nan, Honghong; Zheng, Xiaoting; Zhang, Xiaojun^*

来源：RSC Advances, 2015, 5(103): 84974-84979.

DOI：10.1039/c5ra18625k

• SUPERCAPACITOR ELECTRODE MATERIALS
• SOL-GEL PROCESS
• IN-SITU GROWTH
• CAPACITIVE PERFORMANCE
• NANOTUBE ARRAYS
• NANOSHEETS
• GRAPHENE
• CARBON
• NANOSTRUCTURES
• FABRICATION

In this paper, we report CoNi2S4 nanowire arrays (NWAs) on 3D nickel foams based on an anion-exchange reaction which involved the pseudo Kirkendall effect. Due to the low electronegativity of sulfur, CoNi2S4 NWAs exhibit higher conductivity compared with Ni-Co oxide NWAs when used as active materials in supercapacitors. The electrochemistry tests show that these self-supported electrodes are able to deliver ultrahigh specific capacitance (1250 F g(-1) at a current density of 5 mA cm(-2)), together with a considerable areal capacitance (2.5 F cm(-2) at a current density of 5 mA cm(-2)), Furthermore, a capacitance retention of 72% after 5000 charge-discharge cycles at 5 mA cm(2) is obtained, indicating the excellent cycling stability of the CoNi2S4 NWA/nickel foam electrode. The superior electrochemistry capacity demonstrates that CoNi2S4 NWAs are promising electrode materials for supercapacitor applications.

• 出版日期2015
• 单位安徽师范大学