Specific Surface versus Electrochemically Active Area of the Carbon/Polypyrrole Capacitor: Correlation of Ion Dynamics Studied by an Electrochemical Quartz Crystal Microbalance with BET Surface

• DOI: 10.1021/acs.langmuir.6b00523
• Publication Date: 2016-04-15T22:24:06Z
• Authors: Heike L. K. S. Mosch; Oluseun Akintola; Winfried Plass; Stephanie Höppener; Ulrich S. Schubert; Anna Ignaszak
• Keywords: Quartz Crystal Microbalance; Polypyrrole; BET theory; Crystal (programming language)

Carbon/polypyrrole (PPy) composites are promising electrode materials for energy storage applications such as lightweight capacitors. Although these composed of relatively inexpensive components, there is a gap knowledge regarding the correlation between surface, porosity, ion exchange dynamics, and interplay double layer capacitance pseudocapacitance. In this work we evaluate specific surface area analyzed by BET method accessible ions using electrochemical quartz-crystal microbalance (EQCM) SWCNT/PPy carbon black Vulcan XC72-R/PPy composites. The study revealed that polymer has significant influence on pore size low polypyrrole, mass change thus large polymer-containing electrodes. This indicates multiple redox active centers in charged chain good scavengers. Also, composite electrodes, effective charge occurs at polypyrrole–carbon junctions, which easy to design/multiply proper carbon-to-polymer weight ratio. electrochemically both important parameters calculation capacitance. SWCNTs/PPy showed highest capacitances normalized compared polymer–carbon black. TEM imaging very homogeneous distribution nanosized particles onto CNTs, facilitates synergistic effect (CNTs) pseudocapacitance (polymer). trend with suggest additional effects solvent co-insertion into contribution associated activity oxygen-containing functional groups surface.