Layered nickel cobalt hydrogen phosphate for high performance of supercapattery electrode

This work reports on the preparation of nickel cobalt hydrogen phosphate as an electrode for supercapatteries. The morphology of the hydrogen phosphate was controlled by varying the ethanol-to-water ratio to 1:0, 5:1, 3:1, 2:1, and 1:1. It was found that a higher proportion of water resulted in a layered structure of the products. X-ray diffraction patterns and infrared spectra confirmed the formation of nickel cobalt hydrogen phosphate. As supercapattery electrode, the sample prepared with an ethanol-to-water ratio of 2:1, denoted as NiCoP1-4 exhibited a high specific capacity of 424 Cg−1 at a current density of 0.5 Ag−1 surpassing that of the electrode prepared using only ethanol. Furthermore, NiCoPi-4 demonstrated high stability with 96.3% retention after 5000 cycles.