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

Herein, the hydrothermal method is used to synthesize microrod‐like morphology of calcium phosphate (Ca2P2O7). 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.