Abstract
Electric Double Layer Capacitor (EDLC) holds the highest share of commercial supercapacitor market. However, it has been proven that current Helmholtz, Gouy-Chapman and Stern models do not provide comprehensive explanation for energy storage mechanism in EDLC. In this work the effects of interdigitated EDLC design on capacitance of flexible laser scribed interdigitated microsupercapacitor (LSG-MSC) are studied. Three design parameters are tested, (1) current collector-electrode interaction, (2) electrode aperture, and (3) distance between parallel electrodes. Noticeable change was observed in the total capacitance upon change in LSG-MSC design which was analyzed in detail using cyclic voltammetry, electrochemical impedance spectroscopy and electrostatic simulation using COMSOL Multiphysics. It was found that in addition to electric double layer capacitance, an electric field was generated between electrodes and between electrode and current collector which led to small electrostatic capacitance between them. This electric field was also found to cause disturbance in double layer formation at the electrode thus causing change in the overall capacitance as the design parameters were varied.
Highlights
The concept of electric double layer capacitance was first discovered by Hermann von Helmholtz in 1853 [1]
This suggests that the effect of the electric field on double layer formation as well as electrostatic capacitance cannot be ignored for on-chip microsupercapacitors and understanding its mechanism is important for designing high performance on-chip microsupercapacitors
We have shown through experiment and simulation that the total capacitance of interdigitated microsupercapacitor is heavily dependent on the distance between electrodes and between electrode and current collector
Summary
The concept of electric double layer capacitance was first discovered by Hermann von Helmholtz in 1853 [1] The double layer is considered to be a molecular capacitor with distance between the plates in Angstroms having very high specific capacitances. This model was only valid for solutions with very high electrolyte concentration. In 1910 and 1913 respectively, Guoy and Chapman gave separate theories for electric double layer formation in dilute solutions [2], [3] The combination of their respective explanations became known as the Gouy-Chapman model.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
