02301nas a2200277 4500008004100000022001400041245013200055210006900187260007100256300001600327490000600343520126900349653002001618653002201638653002301660653001601683653002201699653001901721100002501740700002401765700002801789700002501817700002501842700002401867856013201891 2013 eng d a1944-824400aDesign of a high performance thin all-solid-state supercapacitor mimicking the active interface of its liquid-state counterpart0 aDesign of a high performance thin allsolidstate supercapacitor m a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcDEC a13397-134040 v53 a

Here we report an all-solid-state supercapacitor (ASSP) which closely mimics the electrode-electrolyte interface of its liquid-state counterpart by impregnating polyaniline (PANO-coated carbon paper with polyvinyl alcohol-H2SO4 (PVA-H2SO4) gel/plasticized polymer electrolyte. The well penetrated PVA-H2SO4 network along the porous carbon matrix essentially enhanced the electrode-electrolyte interface of the resulting device with a very low equivalent series resistance (ESR) of 1 Omega/cm(2) and established an interfacial structure very similar to a liquid electrolyte. The designed interface of the device was confirmed by cross-sectional elemental mapping and scanning electron microscopy (SEM) images. The PANI in the device displayed a specific capacitance of 647 F/g with an areal capacitance of 1 F/cm(2) at 0.5 A/g and a capacitance retention of 62% at 20 A/g. The above values are the highest among those reported for any solid-state-supercapacitor. The whole device, including the electrolyte, shows a capacitance of 12 F/g with a significantly low leakage current of 16 mu A(2). Apart from this, the device showed excellent stability for 10000 cycles with a coulombic efficiency of 100%. Energy density of the PANI in the device is 14.3 Wh/kg.

10aall-solid-state10acyclic voltametry10aimpedance analysis10apolyaniline10apolyvinyl alcohol10asupercapacitor1 aAnothumakkool, Bihag1 aTorris, Arun, A. T.1 aBhange, Siddheshwar, N.1 aUnni, SreeKuttan, M.1 aBadiger, Manohar, V.1 aKurungot, Sreekumar uhttps://library.ncl.res.in/content/design-high-performance-thin-all-solid-state-supercapacitor-mimicking-active-interface-its-002995nas a2200241 4500008004100000022001400041245015500055210006900210260007100279300001400350490000600364520208400370653001502454653002402469653001602493653001402509653001602523653001502539100002102554700002502575700002402600856012902624 2015 eng d a1944-824400a3D polyaniline porous layer anchored pillared graphene sheets: enhanced interface joined with high conductivity for better charge storage applications0 a3D polyaniline porous layer anchored pillared graphene sheets en a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcAPR a7661-76690 v73 a

Here, we report synthesis of a 3-dimensional (3D) porous polyaniline (PANI) anchored on pillared graphene (G-PANI-PA) as an efficient charge storage material for supercapacitor applications. Benzoic acid (BA) anchored graphene, having spatially separated graphene layers (G-Bz-COOH), was used as a structure controlling support whereas 3D PANI growth has been achieved by a simple chemical oxidation of aniline in the presence of phytic acid (PA). The BA groups on G-Bz-COOH play a critical role in preventing the restacking of graphene to achieve a high surface area of 472 m(2)/g compared to reduced graphene oxide (RGO, 290 m(2)/g). The carboxylic acid (-COOH) group controls the rate of polymerization to achieve a compact polymer structure with micropores whereas the chelating nature of PA plays a crucial role to achieve the 3D growth pattern of PANI. This type of controlled interplay helps G-PANI-PA to achieve a high conductivity of 3.74 S/cm all the while maintaining a high surface area of 330 m(2)/g compared to PANI-PA (0.4 S/cm and 60 m(2)/g). G-PANI-PA thus conceives the characteristics required for facile charge mobility during fast charge-discharge cycles, which results in a high specific capacitance of 652 F/g for the composite. Owing to the high surface area along with high conductivity, G-PANI-PA displays a stable specific capacitance of 547 F/g even with a high mass loading of 3 mg/cm(2), an enhanced areal capacitance of 1.52 F/cm(2), and a volumetric capacitance of 122 F/cm(3). The reduced charge-transfer resistance (RCT) of 0.67 O displayed by G-PANI-PA compared to pure PANI (0.79 O) stands out as valid evidence of the improved charge mobility achieved by the system by growing the 3D PANI layer along the spatially separated layers of the graphene sheets. The low RCT helps the system to display capacitance retention as high as 65% even under a high current dragging condition of 10 A/g. High charge/discharge rates and good cycling stability are the other highlights of the supercapacitor system derived from this composite material.

10adurability10aionic accessibility10aphytic acid10apillaring10apolyaniline10arestacking1 aSekar, Pandiaraj1 aAnothumakkool, Bihag1 aKurungot, Sreekumar uhttps://library.ncl.res.in/content/3d-polyaniline-porous-layer-anchored-pillared-graphene-sheets-enhanced-interface-joined-002522nas a2200253 4500008004100000022001400041245015300055210006900208260000800277300001200285490000700297520158900304653004001893653003801933653002601971653001601997653001902013653002102032100001502053700002402068700002002092700002402112856013202136 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

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).

10aelectrochemical active sulfate area10aelectrochemical functionalization10aelectropolymerization10apolyaniline10asupercapacitor10asuperhydrophilic1 aSoni, Roby1 aKashyap, Varchaswal1 aNagaraju, Divya1 aKurungot, Sreekumar uhttps://library.ncl.res.in/content/realizing-high-capacitance-and-rate-capability-polyaniline-enhancing-electrochemical-surface