Shivaji University

About: Shivaji University is a education organization based out in Kolhāpur, Maharashtra, India. It is known for research contribution in the topics: Thin film & Scanning electron microscope. The organization has 3078 authors who have published 5295 publications receiving 115397 citations.

Chemical synthesis of hierarchical NiCo2S4 nanosheets like nanostructure on flexible foil for a high performance supercapacitor

Abstract: In this study, hierarchical interconnected nickel cobalt sulfide (NiCo2S4) nanosheets were effectively deposited on a flexible stainless steel foil by the chemical bath deposition method (CBD) for high-performance supercapacitor applications. The resulting NiCo2S4 sample was characterized by X-ray powder diffraction (XRD), field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HR-TEM), and electrochemical measurements. XRD and X-ray photoelectron spectroscopy (XPS) results confirmed the formation of the ternary NiCo2S4 sample with a pure cubic phase. FE-SEM and HR-TEM revealed that the entire foil surface was fully covered with the interconnected nanosheets like surface morphology. The NiCo2S4 nanosheets demonstrated impressive electrochemical characteristics with a specific capacitance of 1155 F g−1 at 10 mV s−1 and superior cycling stability (95% capacity after 2000 cycles). These electrochemical characteristics could be attributed to the higher active area and higher conductivity of the sample. The results demonstrated that the interconnected NiCo2S4 nanosheets are promising as electrodes for supercapacitor and energy storage applications.

Bendable All-Solid-State Asymmetric Supercapacitors based on MnO2 and Fe2O3 Thin Films

Abstract: This article is free to read on the publishers website The growing interest in portable and consumable electronics demands efficient and low‐cost energy storage devices with excellent flexibility and of light weight. We demonstrate flexible high‐performance all‐solid‐state thin‐film asymmetric supercapacitors (ASSTF‐ASCs) using α‐MnO2 and α‐Fe2O3 thin films as positive and negative electrodes, respectively. The as‐fabricated ASSTF‐ASC devices have excellent electrochemical performance with extended potential window of 2.0 V and excellent cycling stability for 2500 cycles. Impressively, an MnO2//Fe2O3 asymmetric cell demonstrates high specific capacitance of 145 F g−1 with a high energy density of 41 Wh kg−1 while maintaining a power density of 2.1 kW kg−1. A parallel combination of two MnO2//Fe2O3 asymmetric cells is able to illuminate a panel of 31 light emitting diodes (LEDs). These findings may offer new opportunities for the use of asymmetric configurations in energy storage devices for various portable electronic systems.