Co-electro-deposition of the MnO2–PEDOT:PSS nanostructured composite for high areal mass, flexible asymmetric supercapacitor devices

Abstract

To meet the rapidly growing demand, it is necessary to develop novel flexible energy storage devices with a high energy density in a limited area, a fast charging ability, a low cost for mass production and a miniaturized device size. To address the above issues, here we introduce the co-electro-deposition strategy, which is able to prepare an electrode material with a high areal capacitance (1670 mF cm À2 at 0.5 mA cm À2 ), a high areal mass (8.5 mg cm À2 ), an excellent mechanical robustness, a high through-put and great convenience even on a piece of a ubiquitous stainless steel mesh current collector. Based on this advancement, we are able to obtain an ultrathin (less than 200 mm) aqueous asymmetric supercapacitor device with a high energy density (1.8 Â 10 À3 W h cm À3 ), a high power density (0.38 W cm À3 at 3.62 Â 10 À4 W h cm À3 ) and an excellent rate capability. This energy storage device is integrated into a prototype smart card to drive a light emitting diode (LED) indicator, which is charged for 5 seconds and can light up the indicator for more than 2 hours, demonstrating great promise in miniaturized novel flexible energy storage devices.

Flexible Advanced Asymmetric Supercapacitors Based on Titanium Nitride-based Nanowire Electrodes

“…Moreover, in comparison to organic electrolytes, aqueous gel polymer electrolytes have higher ionic conductivity and much less toxicity, which could offer high power density and great promise for wearable devices [6]. In this regard, substantial efforts have been made to explore suitable energy-storage materials for the fabrication of flexible ASCs [4,24,25] Manganese dioxide (MnO 2 ), an attractive pseudocapacitive material, has drawn a large number of interests as SCs electrode because of its ultrahigh theoretical specific capacitance of ~1400 F g -1 , earth-abundant nature and non-toxicity [32][33][34][35][36][37]. However, it undergoes poor conductivity and low cation diffusivity, which results in low energy density and limited rate 5 capability [32,[38][39][40].…”

Scalable self-growth of Ni@NiO core-shell electrode with ultrahigh capacitance and super-long cyclic stability for supercapacitors

“…16 Moreover, the ANF//RGO-ASC device also exhibited a superior power density of 0.42 W cm À3 , which is considerably higher than that of SSCs and ASCs. 1, [23][24][25][26][27][28][29] After charging at a current density of 20 mA cm À2 for 10 s, a tandem device with three ANF//RGO-ASC devices in series could power a light-emitting diode array display (4-5 V) for B1 min (inset in Figure 5). Moreover, because of the unique porous structure and strong mechanical properties, the volumetric performance of the ANF//RGO-ASC device can be further improved by compression of the device.…”

Preparation of supercapacitors based on nanocomposites films of MnO2/CB/C from sodium alginate and MnO2 nanoparticles by direct electrophoretic deposition and carbonization

“…The common and traditional preparation electrodes method for supercapacitors is mixing MnO 2 materials with carbon blacks and polyvinylidene fluoride (PVDF), then the mixture is made to be films by a doctor blade on electron collectors, and this process is always called to Doctor Blade process [8]. But the MnO 2 materials always lose their capacities with charge/discharge cycles, which is due to the dissolution of Mn 4+ to Mn 2+ into electrolytic solution, or collapse of crystal structure during electrochemical reactions in charge/ discharge cycles [9].…”