Enhancing the Electrochemical Performance of Ternary Metallic Phosphates for High‐Energy and Anti‐Self‐Discharge Supercapacitors through Binder Optimization
Haseebul Hassan, Muhammad Waqas Iqbal, Amir Muhammad Afzal, Saikh Mohammad Wabaidur, Essam A. Al‐Ammar, Mohd Zahid Ansari
Abstract
Supercapacitors have proven themselves as a subject of interest over the years for energy storage. As a result, it is not surprising that significant effort has been put into supercapacitor research. However, a device with all desirable properties still needs to be developed, requiring special attention. A simple synthesis of porous magnesium niobium silver phosphate (Mg 3 Nb 1− x Ag x (PO 4 ) 3 ) nanocomposites is presented using a novel mixed solvent solution and a hydrothermal method. The MgNbAgPO 4 anode with an interconnected porous structure not only offers a large number of active sites for divalent ion trapping but also improves charge transfer kinetics. As a result, the Mg 3 Nb 1− x Ag x (PO 4 ) 3 anode has a high specific capacity of 958 C g −1 using a binder‐free electrode and better rate capability. The full‐cell design is also built with Mg 3 Nb 1− x Ag x (PO 4 ) 3 and activated carbon (AC). The hierarchical pore structure and appropriate functional groups Mg 3 Nb 1− x Ag x (PO 4 ) 3 anode deliver a maximum energy density of 57 Wh kg −1 , a high power density of 1200 kW kg −1 , and anti‐self‐discharge solid behavior. The analysis of the charge storage mechanism suggests that Mg 3 Nb 1− x Ag x (PO 4 ) 3 //AC supercapattery involves adsorption/desorption and Faradic reactions to store charge. This study opens the path for high‐performance Mg 3 Nb 1− x Ag x (PO 4 ) 3 electrode and gives a better knowledge of charge storage.