02539nas a2200169   4500008004100000245015500041210006900196260000800265300001400273490000700287520186400294100001702158700002702175700001502202700002402217856012802241       2018                        eng d00aRationally designed self-standing V2O5 electrode for high voltage non-aqueous all-solid-state symmetric (2.0 V) and asymmetric (2.8 V) supercapacitors0 aRationally designed selfstanding V2O5 electrode for high voltage  cMAY  a8741-87510 v103 aThe maximum capacitive potential window of certain pseudocapacitive materials cannot be accessed in aqueous electrolytes owing to the low dissociation potential of 1.2 V possessed by water molecules. However, the inferior pseudocapacitance exhibited by the commonly used electrode materials when integrated with non-aqueous electrolytes still remains a challenge in the development of supercapacitors (SC). Proper selection of materials for the electrode and a rational design process are indeed important to overcome these practical intricacies so that such systems can perform well with non-aqueous electrolytes. We address this challenge by fabricating a prototype all-solid-state device designed with high-capacitive V2O5 as the electrode material along with a Li-ion conducting organic electrolyte. V2O5 is synthesized on a pre-treated carbon-fibre paper by adopting an electrochemical deposition technique that effects an improved contact resistance. A judicious electrode preparation strategy makes it possible to overcome the constraints of the low ionic and electrical conductivities imposed by the electrolyte and electrode material, respectively. The device, assembled in a symmetrical fashion, achieves a high specific capacitance of 406 F g(-1) (at 1 A g(-1)). The profitable aspect of using an organic electrolyte is also demonstrated with an asymmetric configuration by using activated carbon as the positive and V2O5 as the negative electrode materials, respectively. The asymmetric device displays a wide working-voltage window of 2.8 V and delivers a high energy density of 102.68 W h kg(-1) at a power density of 1.49 kW kg(-1). Moreover, the low equivalent series resistance of 9.9 Omega and negligible charge transfer resistance are observed in the impedance spectra, which is a key factor that accounts for such an exemplary performance.1 aGhosh, Meena1 aVijayakumar, Vidyanand1 aSoni, Roby1 aKurungot, Sreekumar  uhttp://library.ncl.res.in/content/rationally-designed-self-standing-v2o5-electrode-high-voltage-non-aqueous-all-solid-state02521nas a2200253   4500008004100000022001400041245015300055210006900208260000800277300001200285490000700297520158900304653004001893653003801933653002601971653001601997653001902013653002102032100001502053700002402068700002002092700002402112856013102136       2018                        eng d  a1944-824400aRealizing high capacitance and rate capability in polyaniline by enhancing the electrochemical surface area through induction of superhydrophilicity0 aRealizing high capacitance and rate capability in polyaniline by  cJAN  a676-6860 v103 a<p>Polyaniline (PANI) as a pseudocapacitive material has very high theoretical capacitance of 2000 F g(-1). However, its practical capacitance has been limited by low electrochemical surface area (ESA) and unfavorable wettability toward aqueous electrolytes. This work deals with a strategy wherein the high ESA of PANI has been achieved by the induction of superhydrophilicity together with the alignment of PANI exclusively on the surface of carbon fibers as a thin layer to form a hybrid assembly. Superhydrophilicity is induced by electrochemical functionalization of the Toray carbon paper, which further induces superhydrophilicity to the electrodeposited PANI layer on the paper, thereby ensuring a high electrode-electrolyte interface. The Toray paper is electrochemically functionalized by the anodization method, which generates a highly active electrochemical surface as well as greater wettability (superhydrophilic) of the carbon fibers. Because of the strong interaction of anilinium chloride with the hydrophilic carbon surface, PANI is polymerized exclusively over the surface of the fibers without any appreciable aggregation or agglomeration of the polymer. The PANI-Toray paper assembly in the solid-state prototype supercapacitor can provide a high gravimetric capacitance of 1335 F g(-1) as well as a high areal capacitance of 1.3 F cm(-2) at a current density of 10 A g(-1). The device also exhibits high rate capability, delivering 1217 F g(-1) at a current density of 50 A g(-1) and a high energy density of 30 W h kg(-1) at a power density of 2 kW kg(-1).</p>10aelectrochemical active sulfate area10aelectrochemical functionalization10aelectropolymerization10apolyaniline10asupercapacitor10asuperhydrophilic1 aSoni, Roby1 aKashyap, Varchaswal1 aNagaraju, Divya1 aKurungot, Sreekumar  uhttp://library.ncl.res.in/content/realizing-high-capacitance-and-rate-capability-polyaniline-enhancing-electrochemical-surface