Abstract
Cyclic voltammograms and optical absorption spectra of PEDOT/WO3 composite films were recorded in order to identify possible interactions and modes of improved performance of the composite as compared to the single materials. Changes in the shape of redox peaks related to the W(VI)/W(V) couple in the CVs of WO3 and the composite PEDOT/WO3 films indicate electrostatic interactions between the negatively charged tungsten oxide species and the positively charged conducting polymer. Smaller peak separation suggests a more reversible redox process due to the presence of the conducting polymer matrix, accelerating electron transfer between tungsten ions. Electronic absorption spectra of the materials were analyzed with respect to changes of the shapes of the spectra and characteristic band positions. There are no noticeable changes in the position of the electronic absorption bands of the main chromophores in the electronic spectra of the composite film. Obviously, the interactions accelerating the redox performance do not show up in the optical spectra. This suggests that the existing electrostatic interactions in the composite do not significantly change the opto-electronic properties of components of the composite but resulted in the redistribution of fractions of polaron and bipolaron forms in the polymer.
Highlights
In recent years growing attention has been paid to new hybrid materials combining organic and inorganic compounds
We focus on a comparative study of cyclic voltammetry and electronic absorption spectra of single component films (PEDOT, WO3 ) and their composite material (PEDOT/WO3 ) at different electrode potentials in non-aqueous electrolyte solutions, in order to identify the contributions of redox processes and optoelectronic absorption and to conclude on the possible interaction between the components conceivably affecting their performance as supercapacitor electrode material
The morphology of tungsten oxide and the PEDOT/WO3 composite deposited on FTO and the localization of tungsten oxide deposits was studied with scanning electron microscopy and local EDX analysis
Summary
In recent years growing attention has been paid to new hybrid materials combining organic and inorganic compounds. We focus on a comparative study of cyclic voltammetry and electronic absorption spectra of single component films (PEDOT, WO3 ) and their composite material (PEDOT/WO3 ) at different electrode potentials in non-aqueous electrolyte solutions, in order to identify the contributions of redox processes and optoelectronic absorption and to conclude on the possible interaction between the components conceivably affecting their performance as supercapacitor electrode material. To our knowledge, such combined electrochemical and spectroelectrochemical investigations of PEDOT/WO3 composite films prepared by electrochemical deposition have not been reported. Such full characterization, including further experiments and taking into account electrolyte solution effects as addressed elsewhere) [22], are planned to be performed in the future, aiming at proper optimization of the composite
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