Expeditious and eco-friendly hydrothermal polymerization of PEDOT nanoparticles for binder-free high performance supercapacitor electrodes

Abstract

. (2016). Expeditious and ecofriendly hydrothermal polymerization of PEDOT nanoparticles for binderfree high performance supercapacitor electrodes. RSC Advances: an international journal to further the chemical sciences, 6 (111), 110433-1-110443-11.Expeditious and eco-friendly hydrothermal polymerization of PEDOT nanoparticles for binderfree high performance supercapacitor electrodes Abstract Poly(3,4-ethylenedioxythiophene) (PEDOT) is a promising conjugated polymer that has attracted attention because of its outstanding electronic properties, useful for a wide range of applications in energy storage devices. However, synthesis of high-quality PEDOT occurs via vapour phase polymerization and chemical vapour deposition techniques using extrinsic hard templates or complicated experimental setups. This study introduces a simple hydrothermal polymerization technique using ferric chloride (FeCl3) as an oxidizing agent to overcome the above drawback, which results in good conductive, crystalline PEDOT nanodendrites and nanospheres. The effects of varying the molar ratio of FeCl3 oxidant were investigated in terms of the structural, morphological and electrochemical properties of PEDOT. The supercapacitive performance of the as-polymerized PEDOT nanostructures was determined by fabricating an electrode without the aid of organic binders or conductive additives. PEDOT nanodendrites polymerized using 2.5 molar ratio of FeCl3 demonstrated enhanced electrochemical performance with a maximum specific capacitance of 284 F g-1 with high energy density of 39.44 W h kg-1 at 1 A g-1 current density in 1 M H2SO4 electrolyte. Moreover, the sample possessed higher conductivity, better specific surface area, improved electrochemical properties, comparable crystallinity, and excellent cycling stability after 5000 charge/discharge cycles than the other PEDOT nanostructures. Importantly, the results establish that these materials afford good redox behaviors with better conductivity suitable for the development of an organic electrode-based supercapacitor with high specific charge capacity and stability. and excellent cycling stability after 5000 charge/discharge cycles than the other PEDOT nanostructures.Importantly, the results establish that these materials afford good redox behaviors with better conductivity suitable for the development of an organic electrode-based supercapacitor with high specific charge capacity and stability.

Electrochemical Behaviour of Lithium, Sodium and Potassium Ion Electrolytes in a Na0.33V2O5 Symmetric Pseudocapacitor with High Performance and High Cyclic Stability

“…Figure (b) display the frequency dependent phase angles (Bode plots) of the symmetric devices. In the plots, the lower frequency phase angle approaches −90°, indicating that the supercapacitor device perform as a pure capacitor . The Na 0.33 V 2 O 5 symmetric supercapacitor in LiCl, NaCl and KCl electrolytes show a maximum phase angle of −76.9°, −78° and −76.5° at low frequency region represents the capacitive behaviour.…”

High Stable Supercapacitors Based on Poly(2,3-dihydrothieno[3,4-b][1,4]dioxin-2-yl)methanol Nanonet@Nanotube Array by Template-Free Electrochemical Preparation

“…The bands at 1189 cm −1 , 1013 cm −1 (EDOT-MeOH) and 1195 cm −1 , 1085 cm −1 (polymers) were attributed to the vibration of C-O-C and C-OH. 28 It is worth noting that, in the spectra of EDOT-MeOH, the bands at 3112 cm −1 was C-H vibration of the 2,5positions in the thiophene ring, while it disappeared in the spectra of PEDOT-MeOH-PNN, PEDOT-MeOH-HNA and PEDOT-MeOH-PNN@PEDOT-MeOH-HNA, illustrating the electropolymerization took place at 2,5-positions of the thiophene ring. 29 Therefore, the chemical structure of the PEDOT-MeOH was obtained (Scheme S2).…”