Facile synthesis of silver-copper binary phosphate (AgxCuxPO4) using a co-precipitation approach to enhance the electrochemical performance of Energy Storage devices

In recent years, scientists have focused on producing energy storage devices that deliver high energy and power density. No single device can simultaneously fulfill the requirement of high energy density and high power density. So a hybrid type of energy storage device (ESD) called supercapattery is the main focused research area for researchers. Here, we synthesized pristine silver phosphate (Ag3PO4), copper phosphate (Cu2PO4), and silver-copper binary phosphate (AgCuPO4) with different weight ratios (25/75, 50/50). The Ag0.5Cu0.5PO4(S4) sample exhibited a diverse array of nanoparticle shapes, including spherical, irregular, and faceted structures, with nanometer-scale dimensions. The highest specific capacity of 571 Cg−1was shown by the AgCuPO4(50/50 weight ratio) sample. Then this best sample AgCuPO4(50/50 weight ratio) was applied in supercapattery applications with activated carbon. The supercapattery (AgCuPO4//AC) shows a specific capacity of 162 Cg−1. At 0.2 Ag−1. The AgCuPO4//AC in two-cell operation can provide 49.12 Wh-kg−1energy along sustaining power of 800 W-kg−1. The AgCuPO4//AC supercapattery retained 84% capacity after completing 5000 GCD cycles.Graphical abstract