02169nas a2200253 4500008004100000022001400041245013500055210006900190260000900259300001100268490000800279520127900287653002401566653003601590653002901626100002201655700001701677700001901694700001801713700001801731700001701749700001801766856013101784 2021 eng d a0169-433200aFabrication of high energy density supercapacitor device based on hollow iridium oxide nanofibers by single nozzle electrospinning0 aFabrication of high energy density supercapacitor device based o cAPR  a1491020 v5463 a

Herein, we have synthesized iridium oxide (IrO2) nanofibers using electrospinning technique and optimization of annealing temperature is undertaken in order to obtain high quality IrO2 nanofibers. The annealing temperature is varied as 200, 300, 400 and 500 degrees C. The synthesized material has hollow nanofibrous morphology with average diameter similar to 45 nm. The formed nanofibers are amorphous in nature. The X-ray Photoelectron Spectroscopy (XPS) result revealed that synthesized iridium is in +4 oxidation state. The electrochemical performance of IrO2 electrodes showed 2 V potential window in three electrode system using 1 M Sodium sulphate (Na2SO4) aqueous electrolyte. The maximum specific capacitance is obtained for sample annealed at 400 degrees C (705F/g at 1 mA/cm(2)) which is due to the well-developed morphology with complete removal of polymer content. Moreover, a novel solid state symmetric IrO2/IrO2 supercapacitor with a high operating voltage of 2 V is built. The symmetric supercapacitor exhibits an energy density of 59 Wh/kg at a power density of 714 W/kg and an excellent cycling stability. These results demonstrate the potentialities of using IrO2 for symmetric supercapacitor for building high energy and power density devices.

10aAqueous electrolyte10aHollow iridium oxide nanofibers10aSymmetric supercapacitor1 aBeknalkar, S., A.1 aTeli, A., M.1 aHarale, N., S.1 aPatil, D., S.1 aPawar, S., A.1 aShin, J., C.1 aPatil, P., S. uhttps://library.ncl.res.in/content/fabrication-high-energy-density-supercapacitor-device-based-hollow-iridium-oxide-nanofibers01997nas a2200277 4500008004100000022001400041245015300055210006900208260000900277300001600286490000700302520105300309653002001362653002801382653001501410653001001425653003301435100002201468700001701490700001901507700001801526700001801544700001701562700001801579856012201597 2021 eng d a0272-884200aHierarchical ITO nanofibers coated Mn3O(4) nanoplates core-shell nanocomposites for high performance all-solid-state symmetric supercapacitor device0 aHierarchical ITO nanofibers coated Mn3O4 nanoplates coreshell na cNOV  a29771-297850 v473 aWe have made a first attempt to build a novel Tin doped indium oxide@Manganese oxide (ITO@Mn3O4) nanocomposite electrode to overcome the detriments of Mn3O4 such as low conductivity and small potential window. Herein, we have synthesized the ITO@Mn3O4 nanocomposite by growing Mn3O4 nanoplates over ITO nanofibers synthesized by electrospinning technique. Benefitted from, the high conductivity and negative operating potential window of ITO exceptionally increased in the electrochemical performance of ITO@Mn3O4 was observed. The specific capacitance of optimized ITO@Mn3O4 nanocomposite reached up to 823 F/g at 1 mA/ cm2 in a wide potential window of 2 V using Na2SO4 electrolyte. To determine the practical feasibility an ITO@Mn3O4//ITO@Mn3O4 all-solid-state symmetric device was developed, which operated very well in a 2.2 V voltage window. It was found to deliver a maximum energy density of 88 Wh/kg and a power density of 550 W/ kg. This novel composite inferred the significance of using simple design to build a high-performance device.10aelectrospinning10aITO@Mn3O4 nanocomposite10aPVA-LiClO410aSILAR10aSolid-state symmetric device1 aBeknalkar, S., A.1 aTeli, A., M.1 aHarale, N., S.1 aPawar, K., K.1 aPatil, D., S.1 aShin, J., C.1 aPatil, P., S. uhttps://library.ncl.res.in/content/hierarchical-ito-nanofibers-coated-mn3o4-nanoplates-core-shell-nanocomposites-high15484nas a2200205 45000080041000002450110000412100069001512600008002203000012002284900007002405201477800247100002215025700001715047700001915064700001815083700001815101700001715119700001815136856012415154 2021 eng d00aSupercapacitive performance of SILAR grown Mn3O4 nanoclusters: effect of cationic precursor concentration0 aSupercapacitive performance of SILAR grown Mn3O4 nanoclusters ef cAUG a145-1580 v723 a

Herein, we have investigated the effect of cationic precursor (manganese chloride tetrahydrate) concentration on the electrochemical performance of successive ionic layer adsorption and reaction (SILAR)-deposited Mn3O4 thin films. The concentration of the cationic precursor was varied from 0.05 to 0.15 M, and its effect on physicochemical and electrochemical properties was studied. X-ray diffraction and X-ray photoelectron spectroscopy analyses confirmed that Mn3O4 has a tetragonal structure with Mn2+ and Mn3+ oxidation states. SEM micrographs revealed that nanoclusters of Mn3O4 with an average size of ~200 nm were formed. Moreover, transmission electron microscopy analysis revealed that these nanoclusters were formed from tiny square nanoplates with a size of ~40 nm. Electrochemical studies of the synthesized Mn3O4 thin films were recorded in a three-electrode system, which suggests that 0.1 M cationic precursor concentration has a good electrochemical signature with a specific capacitance of 470 F/g at 1 mA/cm2 current density in 1 M Na2SO4 aqueous electrolyte. The cyclic stability offered was appreciable, with capacitive retention of 75% up to 10,000 CV cycles scanned at 100 mV/s. The charge storage kinetics of the SILAR-grown Mn3O4 thin film were investigated. With systematic study we concluded that, the molarity of the cationic precursor plays a vital role in the porosity and microstructure which drastically affects the electrochemical performance.

1 aBeknalkar, S., A.1 aTeli, A., M.1 aHarale, N., S.1 aPatil, D., S.1 aSutar, J., R.1 aShin, J., C.1 aPatil, P., S. uhttps://library.ncl.res.in/content/supercapacitive-performance-silar-grown-mn3o4-nanoclusters-effect-cationic-precursor