All Conducting Polymer Electrodes for Asymmetric Solid-State Supercapacitors

​Narendra Kurra, Ruiqi Wang, and H. N. Alshareef,"All Conducting Polymer Electrodes for Asymmetric Solid-State Supercapacitors"
J. Mater. Chem. A, 2015, DOI:10.1039/C5TA00829H
​Narendra Kurra, Ruiqi Wang, and H. N. Alshareef
Conducting Polymer, Asymmetric Solid-State Supercapacitors
In this study, we report the fabrication of solid-state asymmetric supercapacitors (ASCs) based on conducting polymer electrodes on a plastic substrate. Nanostructured conducting polymers of poly(3,4-ethylenedioxythiophene), PEDOT, and polyaniline (PANI) are deposited electrochemically over Au-coated polyethylene naphthalate (PEN) plastic substrates. Due to electron donating nature of oxygen groups in the PEDOT, reduction potentials are higher, allowing it to use as a negative electrode material. In addition, high stability of PEDOT in its oxidised state, makes it capable to exhibit electrochemical activity in a wide potential window. This can qualify PEDOT to be used as a negative electrode in fabricating asymmetric solid state supercapacitors with PANI as positive electrode while employing polyvinylalcohol (PVA)/H2SO4 gel electrolyte. The ASCs exhibit a maximum power density of 2.8 W/cm3 at an energy density of 9 mWh/cm3, which is superior to the carbonaceous and metal oxide based ASC solid state devices. Furthermore, the tandem configuration of asymmetric supercapacitors is shown to be capable of powering a red light emitting diode for about 1 minute after charging for 10 seconds.