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Developing novel energy storage technologies is critical for increasing the efficiency of electrochemical energy storage systems. To fulfill this demand, supercapatteries are being introduced as hybrid electrochemical energy storage devices that merge the benefits of supercapacitors and rechargeable batteries into one device. In this study, we synthesized a novel Ni3(PO4)2–NbPO4 electrode material, and carbon nanotubes (CNTs) were incorporated into it. The crystal structure and surface morphology of the Ni3(PO4)2–NbPO4/CNT electrode were investigated by XRD and SEM, respectively. The Ni3(PO4)2–NbPO4/CNT electrode provided 208 mA h g−1 capacity in a three-cell set-up and 38 mA h g−1 in a two-cell set-up. The supercapattery (Ni3(PO4)2–NbPO4/CNT//AC) delivered a maximum of 47 W h kg−1 energy density. The Ni3(PO4)2–NbPO4/CNT device delivered a maximum of 7100 W kg−1 power density …