Electropolymerized Polypyrrole Nanocoatings on Carbon Paper for Electrochemical Energy Storage
A highly electrically conductive and uniform polymer film containing small, evenly sized particles was potentiodynamically electropolymerized at a slow scan rate of 50mVs-1, as compared to the strongly agglomerated and low-conducting films obtained at higher scan rates of 100 and 200mVs-1. Cyclic voltammetry and galvanostatic charge-discharge experiments demonstrated a higher areal capacitance, energy density, and power density in the former material. The superior supercapacitive performance was studied by electrochemical impedance spectroscopy (EIS) and can be explained by both a higher electrical conductivity and a facilitated charge transfer in the redox reactions occurring in the former electrode. This work suggests the possibility of fabricating polypyrrole (PPy) pseudocapactive electrodes with high performance via a facile potentiodynamic synthesis at low scan rates. Meanwhile, it provides an alternative to introducing surface functionalities of conductive polymers onto the carbon paper.
Wei, H., Wang, Y., Guo, J., Yan, X., O'Connor, R., Zhang, X., Shen, N., & Weeks, B. (2015). Electropolymerized Polypyrrole Nanocoatings on Carbon Paper for Electrochemical Energy Storage. ChemElectroChem, 2 (1), 119-126. https://doi.org/10.1002/celc.201402258