A Novel Synthesized 1D Nanobelt-like Cobalt Phosphate Electrode Material for Excellent Supercapacitor Applications

In the present report, we synthesized highly porous 1D nanobelt-like cobalt phosphate (Co(2)P(2)O(7)) materials using a hydrothermal method for supercapacitor (SC) applications. The physicochemical and electrochemical properties of the synthesized 1D nanobelt-like Co(2)P(2)O(7) were investigated using X-ray diffraction (XRD), X-ray photoelectron (XPS) spectroscopy, and scanning electron microscopy (SEM). The surface morphology results indicated that the deposition temperatures affected the growth of the 1D nanobelts. The SEM revealed a significant change in morphological results of Co(2)P(2)O(7) material prepared at 150 °C deposition temperature. The 1D Co(2)P(2)O(7) nanobelt-like nanostructures provided higher electrochemical properties, because the resulting empty space promotes faster ion transfer and improves cycling stability. Moreover, the electrochemical performance indicates that the 1D nanobelt-like Co(2)P(2)O(7) electrode deposited at 150 °C deposition temperature shows the maximum specific capacitance (Cs). The Co(2)P(2)O(7) electrode prepared at a deposition temperature 150 °C provided maximum Cs of 1766 F g(−1) at a lower scan rate of 5 mV s(−1) in a 1 M KOH electrolyte. In addition, an asymmetric hybrid Co(2)P(2)O(7)//AC supercapacitor device exhibited the highest Cs of 266 F g(−1), with an excellent energy density of 83.16 Wh kg(−1), and a power density of 9.35 kW kg(−1). Additionally, cycling stability results indicate that the 1D nanobelt-like Co(2)P(2)O(7) material is a better option for the electrochemical energy storage application.