Evaluation of nafion based double layer capacitors by electrochemical impedance spectroscopy

Electrochemical properties of carbon from oil palm kernel shell for high performance supercapacitors

“…and AC-P electrode shows almost similar phase shift of ~ 80 o indicates that the charge storage is primarily dominated by double layer mechanism [4,46]. This phase shift is different for PC type charge storage mechanism as shallower slope of the Bode plot will be observed.…”

“…The R d arises from the ions adsorption resistance into the porous (micropores and mesopores) network of carbon surface. Previous studies suggest that (i) material with higher micropores volume and (ii) poor pores conductivity network will lead to the decrease ion adsorption efficiency, thus increase the ions diffusion resistance [44][45][46].…”

A bi-functional device for self-powered electrochromic window and self-rechargeable transparent battery applications

“…Whereas, the imaginary part of the impedance sharply increases and the plot appears to be a vertical line characteristic of capacitive behaviour at low frequencies 34 . A possible explanation of the high resistance shown by the cell with the decreasing frequency might be related to the high impedance of the electrolyte 30,35 .…”

Test Method and Equivalent Circuit Modeling of a PEM Fuel Cell in a Passive State

“…DLCs usually contain an organic-based electrolyte, enabling higher voltages to be used before electrolyte breakdown occurs, which increases energy storage. Aqueous H 2 SO 4 has also been used, and a number of DLCs employing Nafion (a polymer membrane common in PEMFCs) have been developed and tested [29]- [32]. The processes in a DLC differ from a PEMFC in that only non-Faradaic processes can occur, such as the movement and accumulation of ions and electrons, whereas in a fuel cell, Faradaic processes dominate, i.e., electrochemical reactions proceed due to a charge transfer between the electrolyte and the electrode.…”