Carbon material derived from biomass is used to modify the sulfur cathode. The modified sulfur cathode composite (ACS) together with PEDOT: PSS-CNT interlayer is used to visualize high performance Li-S cells. The Li-S cells with the interlayer inserted between the separator and ACS cathode shows remarkably improved electrochemical activity with an initial discharge capacity of 950 mA h g-1 at 0.2 C. The improved performance for the interlayer assisted Li-S cells is due to the conductivity of the interlayer, also it can hold back the migrating polysulfides with in the cathode region and hindering the polysulfide shuttling phenomenon.
Supercapacitors (SCs) have got much attention in energy storage devices because of their higher power densities, fast charge-discharge processes, and extended cycle life. Conjugated polymers such as polyaniline (PANI) are widely used for the supercapacitor electrode applications due to its chemical stability, high conductivity, cost-effectiveness and ease of synthesis. PANI/multiwalled carbon nanotube (MWCNT) composite was synthesized via in-situ polymerization method. Morphological studies confirmed the formation of PANI/MWCNT composite. Detailed electrochemical characterization was carried out with aluminum and carbon cloth (CC) as a current collector for the fabrication of SC. PANI/MWCNT composite shows a specific capacitance of 0.02 F/g and 158.4 F/g using aluminum and carbon cloth as current collector, respectively, at a current density of 1 A/g within the potential range of 0 to 1 V in 1M lithium perchlorate electrolyte. The Charge storage in PANI/MWCNT composite SC is a combination of pseudocapacitance and electrical double layer capacitance. PANI/MWCNT composite with CC as current collector reaches a specific capacitance of ~174 F/g at a current density of 0.5 A/g. With the CC current collector, the composite electrode shows high cycling stability for more than 1000 cycles. Fiber-like 3D structure improves the surface area of the electrode and thereby increases the performance of the electrode in terms of cycling stability. The result shows that the synthesized binary composite is a promising electrode material for supercapacitor applications.
Recently, flexible organic optoelectronics have got great attention because of their light weight, mechanical flexibility and cost effective fabrication process. Conjugated polymers like PEDOT: PSS are widely used for the transparent electrode applications due to its chemical stability, high conductivity, flexibility and optical transparency in the visible region. Conductivity of the PEDOT: PSS polymer can be enhanced by adding organic solvents or conducting nano fillers like CNT, graphene, etc. Carbon nanotubes are good nano fillers to enhance the conductivity and mechanical strength of PEDOT: PSS composite film. Inthe present work, the effect of gold nano particles in PEDOT: PSS/CNT composite is studied. The conductivity enhancement in PEDOT: PSS/CNT thin films can be attributed to the formation of CNT network in the polymer matrix and conformational change of the PEDOT from benzoid to quinoid structure. Even though the conductivity was enhanced, the transparency of the composite thin films decreased with increase in CNT concentration. To overcome this problem, gold nano particles were attached to CNT walls via chemical route. AuMWCNT/PEDOT: PSS composite films were prepared by spin coating method. TEM images confirmed the decoration of gold nano particles on CNT walls. Electrical and optical properties of the composite films were studied. This simple solution processed conducting films are suitable for optoelectronic applications