Ni– <scp>GaOOH</scp> Nanoplates on Nickel Foam as an Electrode Material for Supercapacitors

In this work, a facile synthesis of Ni-GaOOH metal hydroxides has been reported as an electrode material for supercapacitors. The morphology was studied by using both scanning electron microscopy (SEM) and transmission electron microscopy (TEM), confirming a nanoplate-like structure. By employing a 3M solution of potassium hydroxide as the electrolyte, the Ni-GaOOH electrode achieves its maximum specific capacitance of 862 F/g at a current density of 1 A/g. When evaluated for ten thousand cycles, Ni-GaOOH's cyclic performance was shown to be extremely stable. The findings demonstrated that the Ni-GaOOH electrode has a good capacitance retention of about 85% and a high Columbic efficiency of 99.5%. The Ni-GaOOH as synthesized is a highly efficient electrode material that is much more appropriate for supercapacitor applications.