Cobalt manganese phosphate and sulfide electrode materials for potential applications of battery-supercapacitor hybrid devices. (June 2022)

• Record Type: Journal Article
• Authors: Iqbal, Muhammad Zahir; Abbasi, Usman; Alzaid, Meshal
• Is Part Of: Journal of energy storage. Volume 50(2022)
• Publication Date: 2022-06
• Subjects: Asymmetric supercapacitor -- Electrode materials -- Cyclic voltammetry -- Specific capacity -- Specific energy; Energy storage -- Periodicals; Energy storage -- Research -- Periodicals; 621.3126
• DOI: 10.1016/j.est.2022.104632
• Languages: English
• ISSNs: 2352-152X

Abstract

Abstract: Electrode materials with efficient electrochemical properties are always desirable for high storage energy devices. Here, due to the attractive attributes of metal phosphates and sulfides, we present a sonochemically synthesized binary composite of cobalt manganese phosphate (CoMn(PO4 )2 ) and sulfide (CoMnS) for the real-world applications. The surface and structural properties of the synthesized materials are then investigated through X-ray diffraction (XRD) and scanning electron microscopy (SEM). Subsequently, the prepared electrode materials are optimized through electrochemical measurements performed in a three-electrode assembly. The best performing electrode, (CoMnS (S2) yielding a specific capacity (Qs ) of 537 C/g at a current density js of 1 A/g) is then amalgamated with a carbonaceous electrode (activated carbon AC) for the fabrication of asymmetric (supercapattery) device. The constructed device (S2//AC) is then subjected to a two-electrode setup, providing an outstanding specific energy (Es ) of 73.52 Wh/kg and a maximum specific power (Ps ) of 10, 200 W/kg. Afterwards, the device is analyzed for a stability test and preserved a maximum capacity retention of 90.03% against 10 A/g for 10, 000 charge-discharge cycles. A semi-empirical approach via Dunn's model is next exploited to scrutinize the negative (capacitive) and positive (diffusive) electrode contributions for the device. Graphical abstract: Unlabelled Image Highlights: By opting a sonochemical approach, binary composite of metal phosphate and sulfide are synthesized. CoMnS (S2) with 50% concentration of each cobalt and manganese have demonstrated an elevated specific capacity (Qs ) of 537 C/g at 1 A/g. The supercapattery comprised of S2 and activated carbon has revealed superior Qs of 259.6 C/g at 1 A/g. On further evaluation the hybrid device procured excellent specific energy and power of 61.3 Wh/kg and 850 W/kg. A semi empirical approach proposed by Dunn is next pursued to investigate the capacitive and diffusive contribution for hybrid device.