Reduced graphene oxide/cobalt phosphate composites with improved electrochemical performance for supercapattery devices. (4th September 2022)

• Record Type: Journal Article
• Authors: Iqbal, Muhammad Zahir; Alam, Faiz; Khan, Junaid; Alam, Shahid; Alhassan, Najam; Alzaid, Meshal
• Is Part Of: International journal of energy research. Volume 46:Number 15(2022)
• Page Start: 23377
• Page End: 23387
• Publication Date: 2022-09-04
• Subjects: cyclic stability -- electrochemical performance -- specific capacitance -- specific energy -- specific power -- supercapattery; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Power resources -- Research -- Periodicals; 621.042
• DOI: 10.1002/er.8636
• Languages: English
• ISSNs: 0363-907X

Abstract

Summary: Among various energy storage devices, supercapatteries are notable for delivering significant electrochemical performance in terms of high specific power and specific energy. Herein, a sonochemical approach was utilized to synthesize the cobalt phosphate (Co3 (PO4 )2 ) for utilization as an electrode material for supercapattery device. To tune the electrochemical performance via enhancement of ionic conduction, composites of Co3 (PO4 )2 along with reduced graphene oxide (rGO) powder at different wt% were made. The optimum electrochemical performance was delivered by the composite containing 85% Co3 (PO4 )2 and 15% rGO profits a maximum Q s of 619.2 C/g at 3 mV/s, and 415.6 C/g (specific capacitance of 593.2 F/g) at 2.0 A/g. In a supercapattery device, the prime electrochemical performer was utilized as the positive and activated carbon as a negative electrode. Our supercapattery device delivered remarkable specific energy of 68.06 Wh/kg and carries a tremendous maximum specific power of 7650 W/kg along with 98.03% of capacity retention observed after the 2000 continuous GCD cycles. The device shows a capacitive contribution of 13.61%, 24.25%, and 39.69% at 10, 50, and 100 mV/s correspondingly calculated through simulation approach. The research demonstrates an aim to tune the electrochemical capability of Co3 (PO4 )2 for potential electrochemical devices. Highlights: Cobalt phosphate is synthesized by sonochemical approach. Composition of cobalt phosphate and reduced graphene oxide was optimized. High specific capacity of 415.6 C/g was obtained via composition containing 85% Co3 (PO4 )2 and 15% rGO. Supercapattery formed by coupling this composite with activated carbon. High power density of 7650 W/kg and high energy density of 68.06 Wh/kg. Specific capacity retention of 98.03% after continuous 2000 GCD cycles. Abstract : Here, we have utilized the novel synthesis sonochemical approach to synthesize cobalt phosphate (Co3 (PO4 )2 ) nanomaterials for energy storage applications. In addition, the conductivity and electrochemical performance composites of Co3 (PO4 )2 are enhanced by doping of reduced graphene oxide (rGO) powder at different wt%. An excellent electrochemical performance was delivered by the composite containing 75% Co3 (PO4 )2 and 25% rGO, exhibiting a maximum specific capacity of 619.2 C/g at 3 mV/s, and 415.6 C/g at 2.0 A/g. This was further utilized as positive electrode material in the supercapattery device which delivers an exceptional specific energy of 68.06 Wh/kg and a maximum specific power of 7650 W/kg.