Facile approach to synthesize Ni(OH)2 nanoflakes on MWCNTs for high performance electrochemical supercapacitors

Ultrathin nanoflakes of Ni(OH)2 were synthesized onto multi-walled carbon nanotubes (MWCNTs) by simple low cost chemically precipitation method for high performance electrochemical supercapacitor applications. The synthesized ultrathin Ni(OH)2 exhibit high specific capacitance of 1735 Fg−1 at a scan rate of 5 mV s−1 with excellent rate capability. This high performance of Ni(OH)2 nanoflakes was attributed to its complete accessibility to the electrolyte and maximum utilization of metal hydroxides. Findings of this work suggest that synthesized electrodes offer low-cost and scalable solution for high-performance energy storage devices.

► Deposition of ultra-thin Ni(OH)2 nanoflakes on MWCNTs. ► Full utilization of the Ni(OH)2 nanoflakes which provide maximum pseudocapacitance while minimizing the high surface area. ► The ultra-thin layer of Ni(OH)2 nanoflakes on highly conductive MWCNTs is favorable for fast ion and electron transfer. ► The ultra-thin layer of Ni(OH)2 nanoflakes on MWCNTs exhibited good cycling stability and lifetime.