Facile synthesis of nickel–cobalt phosphate binary nanocomposite with an enriched electrochemical performance for asymmetric supercapacitor applications
摘要
Electrode materials with fascinating nanostructures and enhanced charge storage capabilities have become an area of significant research interest, as they can enable the electrochemical properties in advanced energy storage devices. In this study, Co3(PO4)2⋅8H2O (CP), Ni3(PO4)2⋅8H2O (NP), and (Ni-Co)3(PO4)2⋅8H2O (NCP) were synthesized using a polyol-based reflux method, without any unique atmosphere or post-heat treatment. The synthesized materials were analyzed for their structural and morphological properties. During the electrochemical study, the synthesized electrode materials showed pseudocapacitive properties. The electrochemical performance of the NCP electrode material was evaluated in a three-electrode system using a 1 M KOH solution, revealing a maximum specific capacity of around 713.33 Fg−1 at a specific current of 1 Ag−1. Subsequently the NCP material was utilized as the electrode in a device paired with charcoal activated carbon (AC) as the negative electrode. This setup maintained an enduring capacity of 144.66 Fg−1 at a density of 1 Ag−1, along with specific energy and power levels of45.20 WhKg−1 and 749.96 W Kg−1 respectively. After more than 10,000 cycles, the device proved to have a coulombic efficiency of 98% and a capacitance retention of around 70% within a potential of 0–1.5 V at a specific current of 5 Ag−1. These results demonstrate the significant electrochemical potential of the synthesized material and its ability to be used as an electrode for supercapacitor applications.