Anomalous electrochemical performance of binary silver-strontium phosphate-based electrode material in supercapattery

Mesoporous silver strontium phosphate (SSP) was synthesized through a facile hydrothermal technique and utilized as a positive electrode for supercapattery. Material's morphology, crystallinity, elemental composition, and homogeneity were carried out through SEM, TEM, XRD, EDS, XPS, and EDS mapping. Various electrochemical characterizations were performed in three as well as two electrode assemblies to ensure the ability of the material towards electrochemical charge storage. In fact, three-electrode results explore that the material possesses excellent performance in terms of specific capacity, lower series resistance, and negligible charge transfer resistance. After a conclusive three electrode assembly findings, an asymmetric supercapacitor was assembled by utilizing SSP as a positive electrode and as a counterpart carbon nanotube (CNT) as a negative electrode. This hybrid device reveals excellent electrochemical performance and was able to deliver a specific capacity of 240.0 C/g. Indeed, not only higher capacity was delivered by this device, nevertheless, its performance was remarkable in terms of high energy density and excellent power density. Besides, the rate capability for the supercapattery was estimated from GCD which was similar to 77% at the highest current density of 12 A/g. The stability has a significant role in energy storage devices and was analyzed by charging and discharging the device, and the results demonstrate the outstanding specific capacity retention of 86.68% after 5000 cycles. Likewise, the device successfully holds coulombic efficiency of 95.79% by the end of 5000 charge-discharge cycles. Our analysis reveals that this material possesses remarkable energy performance which makes it applicable for future supercapattery devices.

Automated summary

Mesoporous silver strontium phosphate (SSP) was synthesized and utilized as a positive electrode for supercapattery. The material was characterized by SEM, TEM, XRD, EDS, XPS, and EDS mapping. Electrochemical characterizations showed excellent performance in terms of capacity, resistance, and charge transfer. An asymmetric supercapacitor was assembled using SSP as the positive electrode and carbon nanotubes (CNT) as the negative electrode, delivering high capacity, energy density, and power density. The device exhibited good rate capability, stability, and coulombic efficiency. The material shows potential for future supercapattery devices.