Abstract
Bare PbS QDs and PbS-GQDs nanocomposite were prepared by chemical methods for supercapattery application and their physicochemical properties studied by suitable analytical techniques which confirms the formation of PbS-GQDs nanocomposite. The electrochemical studies of the prepared materials showed that the PbS-GQDs nanocomposite exhibited high specific capacity, high energy and power densities of 577.94 C g−1, 166.45 Wh kg−1 and 576.01 W kg−1, respectively at 2 A g−1 compared to that of bare PbS QDs. The enhanced electrochemical performance of PbS-GQDs nanocomposite can be associated with the highly conductive platform and large number of active sites of GQDs which resulted in synergistic effect of the composite. The nonlinearity in charging and discharging curves confirm the supercapattery behaviour of the nanocomposite. Moreover, PbS-GQDs nanocomposite electrode showed highly cyclic stability compared to bare PbS QDs after 5000 cycles. The results emphasize the potential of PbS-G QDs nanocomposite as a stable and active electrode material for energy storage application.
Highlights
IntroductionThe supercapattery (batteries and supercapacitor) combines the high-power capability of usual rechargeable batteries with excellent energy density of energy storage devices [1,2]
The supercapattery combines the high-power capability of usual rechargeable batteries with excellent energy density of energy storage devices [1,2]
There are two different operates, the battery operates based on cation based redox reactions at solid state electrode materials whereas supercapacitor operates based on electrolyte ions of adsorption/desorption at electrode/electrolyte interfaces in the electrochemical energy storage process [11]
Summary
The supercapattery (batteries and supercapacitor) combines the high-power capability of usual rechargeable batteries with excellent energy density of energy storage devices [1,2]. There are two different operates, the battery operates based on cation based redox reactions at solid state electrode materials whereas supercapacitor operates based on electrolyte ions of adsorption/desorption at electrode/electrolyte interfaces in the electrochemical energy storage process [11]. Both high specific capacity with high power density and energy density characteristics is achieved in one device named as supercapattery. The behaviour of supercapattery is similar to that of an electrochemical cell with greater performance, high power capability with higher energy density, longer charge–discharge durability and long lifetime [12]
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