Evaporative successive ionic layer adsorption and reaction polymerization of PEDOT: a simple and cost effective technique for binder free supercapacitor electrodes
The present article describes the development of nanostructured poly(3, 4-ethylenedioxythiophene) (PEDOT) thin film supercapacitor electrodes via conventional solution based inexpensive synthetic approach. Here a novel and simple evaporative successive ionic layer adsorption and reaction (ESILAR) method has been employed to polymerize binderless PEDOT thin films on graphite electrode using ferric chloride (FeCl3) oxidant. This method yields PEDOT thin films of good electrochemical performance with high active material loading (∼2.7-8 mg cm−2 with specific capacitance in the range of ∼129-165 F g−1) and exhibits a high specific capacitance of 165 F g−1 for 5.3 mg cm−2 PEDOT thin film coated electrode in 1 M H2SO4 electrolyte. The effects of various number of ESILAR coating cycles were investigated in terms of the structural, morphlogical and electrochemical properties of PEDOT thin film nanostructures. The PEDOT nanostructures deposit as a straightforward freestanding suface structures were easily processable into a supercapacitor electrodes characterized by excellent cycling stability of ∼80-90% of its initial capacitance retaining after 4000 cycles even free from conductive additives and binders. This method provides a useful orientation on the facile and efficient deposition method of PEDOT thin films applicable for the electrochemical energy storage devices.