Understanding volumetric capacitance in conducting polymers

© 2016 Wiley Periodicals, Inc. Recent measurements in poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) films show that capacitance scales with film volume. We discuss the ramifications of this finding and propose a simple model that describes capacitance in terms of sites in which ions injected from the electrolyte replace holes that are extracted from the film by a metal contact. We propose that volumetric capacitance is inversely proportional to the average distance between these sites. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016, 54, 1433–1436.

[1]  S. Srinivasan.  ELECTRODE/ELECTROLYTE INTERFACES: STRUCTURE AND KINETICS OF CHARGE TRANSFER , 2006 .

[2]  R. McCreery,et al.  Electroanalytical performance of carbon films with near-atomic flatness. , 2001, Analytical chemistry.

[3]  W. Lövenich,et al.  PEDOT: Principles and Applications of an Intrinsically Conductive Polymer , 2010 .

[4]  Norbert Koch,et al.  Organic electronic devices and their functional interfaces. , 2007, Chemphyschem : a European journal of chemical physics and physical chemistry.

[5]  John R. Reynolds,et al.  Electrochromic organic and polymeric materials for display applications , 2006, Displays.

[6]  Héctor D. Abruña,et al.  Batteries and electrochemical capacitors , 2008 .

[7]  Quan-hong Yang,et al.  A Metal‐Free Supercapacitor Electrode Material with a Record High Volumetric Capacitance over 800 F cm−3 , 2015, Advanced materials.

[8]  W. R. Salaneck,et al.  Electrochemical and XPS studies toward the role of monomeric and polymeric sulfonate counterions in the synthesis, composition, and properties of poly(3,4-ethylenedioxythiophene) , 2003 .

[9]  Manfred Lindau,et al.  Direct Measurement of Ion Mobility in a Conducting Polymer , 2013, Advanced materials.

[10]  H. Lewerenz.  On the Structure of the Helmholtz Layer and its Implications on Electrode Kinetics , 2013 .

[11]  Se Hyun Kim,et al.  Electrolyte‐Gated Transistors for Organic and Printed Electronics , 2013, Advanced materials.

[12]  Jenq-Neng Hwang,et al.  Optical properties of nondegenerate ground-state polymers: Three dioxythiophene-based conjugated polymers , 2003 .

[13]  Róisín M. Owens,et al.  The organic electrochemical transistor for biological applications , 2015 .

[14]  Man Hoi Wong,et al.  How to make ohmic contacts to organic semiconductors. , 2004, Chemphyschem : a European journal of chemical physics and physical chemistry.

[15]  Christophe Bernard,et al.  High-performance transistors for bioelectronics through tuning of channel thickness , 2015, Science Advances.

[16]  R. McCreery,et al.  Mechanism of electrochemical activation of carbon electrodes: role of graphite lattice defects , 1989 .