High‐Performance Electrode Materials for Electrochemical Energy Storage Devices Based on Microrod‐Like Structures of Calcium Phosphate (Ca₂P₂O₇)

Abstract

Herein, the hydrothermal method is used to synthesize microrod‐like morphology of calcium phosphate (Ca 2 P 2 O 7 ). The prepared electrode manifests a high specific capacitance of 1174.5 Fg −1 and a specific capacity of 807.5 Cg −1 at a scan rate of 5 mV s −1 . Finally, the potential supercapacitor electrode material shows a maximum power density of 1855.7 W kg −1 and an energy density of 55.23 Wh kg −1 at the current densities of 5 and 0.5 Ag −1 , respectively with the three‐electrode system. While, the two‐electrode system exhibits a maximum power density of 1330.9 W kg −1 and an energy density of 11.7 Wh kg −1 at the current densities of 5 and 1 Ag −1 , respectively. The electrode exhibits higher lifetime capacitance retention of 88.74% after 5000 cycles. The b value lies within the range of 0.68–1, which is suitable for both batteries and supercapacitors for transport application.