Fabrication of polyaniline–few-layer MoS2 nanocomposite for high energy density supercapacitors

Investigations on performance of PEDOT:PSS/V2O5 hybrid symmetric supercapacitor with redox electrolyte

“…This could be because of the layered structure of V 2 O 5 allowing intercalation of PEDOT:PSS between the nanosheets of the same and hence allowing easier ion transport and better contact with the nanosheets and charge transfer. 13 The increased steepness of the vertical line at low frequency region for PDVO-16.8 as compared to that of PEDOT:PSS indicates improved capacitive behavior of the same. 56 The Ragone plot, exhibiting the relationship of specific energy with specific power of the devices, is shown in Figure 7(c) where the specific energy (E in Wh/kg) and the specific power (P in W/kg) are calculated from CD measurements, as per the Equations ( 5) and ( 6), respectively.…”

“…It can be seen that the IR drop (the initial drop in the voltage seen at the discharge cycles) for PDVO-16.8 is lower than that of PEDOT:PSS. The specific capacitance (C S ) is also calculated from CD curves using the expression 2,13,52,54 :…”

“…The Nyquist plots consist of a semicircle in the high frequency region and a straight line at the low frequency region. 13,55,56 The equivalent series resistance (ESR) (R s -X intercept in Nyquist plots) is estimated to be 2.26 Ω for PEDOT:PSS which reduces to 1.54 Ω for PDVO-16.8 indicating improved conductivity and better ion transportability. 13,52 With further increase in weight percentage of V 2 O 5 ESR is seen to approach that of pristine V 2 O 5 .…”

“…13,55,56 The equivalent series resistance (ESR) (R s -X intercept in Nyquist plots) is estimated to be 2.26 Ω for PEDOT:PSS which reduces to 1.54 Ω for PDVO-16.8 indicating improved conductivity and better ion transportability. 13,52 With further increase in weight percentage of V 2 O 5 ESR is seen to approach that of pristine V 2 O 5 . It can be seen that the radius of the semicircle, representing the charge transfer resistance (R ct ) corresponding to the Faradaic charge transfer at the electrode/electrolyte interface, also reduces for composites that were showing optimum performance.…”

“…[7][8][9][10][11][12] Among these various electrode materials, CPs are more attractive as they can be considered to be well suited for portable, flexible and wearable electronics such as flat panel displays, sensors, health monitoring devices, and so forth. [11][12][13] Among these CPs, poly (3,4-ethylenedioxythiophene)-poly(styrene sulfonate) (PEDOT:PSS) has been recently paid significant attention due to its strong electrochemical properties, high thermal stability, high and tunable electrical conductivity through thermal or chemical treatment, easy solution processibility and film forming properties, and so forth. [14][15][16][17] Additionally, it can easily be made into free standing films by coating a thick film, and hence has been widely used for flexible supercapacitors.…”