NiO hybrid nanoarchitecture-based pseudocapacitor in organic electrolyte with high rate capability and cycle life

作者：Padmanathan N; Selladurai S; Rahulan K Mani; O'Dwyer Colm; Razeeb Kafil M^*

来源：Ionics, 2015, 21(9): 2623-2631.

DOI：10.1007/s11581-015-1444-9

• Nickel oxide
• Nanomaterials
• Flexible electrode
• Pseudocapacitor
• Supercapacitor

A 3D hierarchical NiO nanostructures with combined microstructure of nanoflakes and nanoflowers have been fabricated on carbon fibre cloth (CFC). Unique nano-micro structural features of NiO/CFC electrode showed an enhanced electrochemical activity in organic electrolyte (1 M tetraethylammonium tetrafluorborate (TEABF(4)) in propylene carbonate) in terms of rate capability, specific energy and power performance as well as potential limit. The electrode showed a specific capacitance of 170 Fg(-1) for a current density of 5 Ag-1. Configured as a two-electrode symmetric supercapacitor, the device showed a specific capacitance of 34.9 Fg(-1) at 1 Ag-1 current density. It delivered a maximum specific energy density of 19.4 Wh kg(-1) at a high power density of 1002.8 W kg(-1) at a constant current density of 1 Ag-1. The cell is also capable of long-term cycling stability with an efficiency of 58 % after 25,000 cycles with a potential window of 0 to +/- 2 V. This superior electrochemical activity of the NiO electrode is due to their structural benefits of well-connected hybrid nano/mesoporous structure and rapid ion intercalation within the porous electrode surface.

• 出版日期2015-9