Sparse MnO2 nanowires clusters for high-performance supercapacitors

作者：Yuan Y F^*; Pei Y B; Guo S Y; Fang J; Yang J L

来源：Materials Letters, 2012, 73: 194-197.

DOI：10.1016/j.matlet.2012.01.046

• MnO2
• Supercapacitor
• Nanocrystalline materials
• Energy storage and conversion

MnO2 nanowires clusters are electrodeposited onto Ni foam by a cyclic voltammetric technique. MnO2 nanowires, about 20 nm in diameter and up to 200 nm in length, present a sparse grass clusters structure. As cathode material for supercapacitors, MnO2 nanowires clusters exhibit superior pseudocapacitance performances with high specific capacitances (1080 Fg(-1) at 4 Ag-1 and 415 Fg(-1) at 30 Ag-1) as well as excellent large-current cycling stability, making it suitable for high-performance supercapacitor application. The improved pseudocapacitance performances are attributed to small size, large surface area and high dispersion degree of MnO2 NWs, as well as 3-Dimension structure of Ni foam, which provide faster ion and electron transfer, larger reaction surface area, higher electrochemical activity, leading to faster reaction kinetics and higher material utilization ratio.

• 出版日期2012-4-15
• 单位浙江理工大学