Bidhan Pandit

V 2 O 5 encapsulated MWCNTs in 2D surface architecture: Complete solid-state bendable highly stabilized energy efficient supercapacitor device

A simple and scalable approach has been reported for V2O5 encapsulation over interconnected multi-walled carbon nanotubes (MWCNTs) network using chemical bath deposition method. Chemically synthesized V2O5/MWCNTs electrode exhibited excellent charge-discharge capability with extraordinary cycling retention of 93% over 4000 cycles in liquid-electrolyte. Electrochemical investigations have been performed to evaluate the origin of capacitive behavior from dual contribution of surface-controlled and diffusion-controlled charge components. Furthermore, a complete flexible solid-state, flexible symmetric supercapacitor (FSS-SSC) device was assembled with V2O5/MWCNTs electrodes which yield remarkable values of specific power and energy densities along with enhanced cyclic stability over liquid configuration. As a practical demonstration, the constructed device was used to lit the ‘VNIT’ acronym assembled using 21 LED’s.

First report on a FeS-based 2 V operating flexible solid-state symmetric supercapacitor device

A high specific energy and specific power can be attained for the supercapacitor devices with the aid of optimum potential. The use of a flexible approach employing a solid-state device structure is always beneficial for advanced technological applications. Hence, effort has been made towards the fabrication of a complete solid-state symmetric and flexible supercapacitor device based on environmentally friendly and abundant iron sulfide as an electrode material, which has been obtained using a successive ionic layer adsorption and reaction method operated at room temperature (27 °C). An operating voltage of 2 V was achieved for the flexible device with a bending stability of 100% over a bending angle of 175° along with the LED glow working model. These outcomes can give new vision towards the construction of solid-state and flexible devices using a simple and low-cost method with potential ability towards roll-to-roll technology for commercialization.

Chemically deposited Bi2S3:PbS solid solution thin film as supercapacitive electrode

Low-cost, easily synthesized, and high energy/power density embedded stable supercapacitive electrodes are the demands for todays renewable and green energy dependent generation. In search of that, Bi2S3:PbS solid solution in thin film form has been synthesized by modest successive ionic layer adsorption and reaction (SILAR) method and characterized by XRD, FESEM, and HRTEM. Formation of solid solution in the form of nanoparticles gilded thin film exposes sufficient electroactive cavities for electroactive ions to incorporate. The composite exhibited excellent specific capacitance of 402.4F/g at current density of 1mA/cm2 with modest charge-discharge cycles. In terms of energy storage, it exhibited maximum specific power of 20.1Wh/kg with accepting specific power of 1.2kW/kg. The combination of two nanoparticles in nanocomposites thin film supplies new tactic for energy storage applications.

Highly conductive energy efficient electroless anchored silver nanoparticles on MWCNTs as a supercapacitive electrode

Simple, cost-effective, and room-temperature electroless reduction process has been advanced to anchor silver nanoparticles over multi-walled carbon nanotubes (MWCNTs). The impact of conductive MWCNT/Ag films with respect to structural, morphological, and electrochemical assets has been investigated. The highly stable and large surface area-aligned MWCNTs combined with conductive silver nanoparticles boost the electrochemical performance of the composite electrode. Remarkable specific capacitance of 757 F g−1 along with a significant cyclic stability of 83% over 3000 cycles has been achieved due to the strong synergistic effect between MWCNTs and silver nanoparticles. Moreover, the electrode exhibits a maximum specific energy and power of 60.7 W h kg−1 and 3.3 kW kg−1, respectively. This superior finding obviously offers future pathways for development in the energy storage field.

First report on solution processed α-Ce2S3 rectangular microrods: An efficient energy storage supercapacitive electrode

Rectangular shaped α-Ce2S3 microrods have been grown with the aid of a facile, efficient, low cost and low temperature chemical bath deposition (CBD) approach in thin film form. Characterizations of α-Ce2S3 have been performed through structural, morphological and surface wettability studies. Intermixed rectangular microrods with lower contact angle provide a reduction in intrinsic resistance and effective ion diffusion path during electrochemical activities ensuring maximum utilization of the active electrode species. This leads to achieve a remarkable specific capacitance of 726 F/g at 2 mV/s scan rate with the excellent electrochemical stability of 93% at 2000 CV cycles. Efficient electrochemical findings exhibit excellent scope of α-Ce2S3 towards next-generation energy storage devices.