How does the double layer at a disk electrode charge?
نویسندگان
چکیده
Because of the nonuniform accessibility of its surface to ion transport from the solution, the double layer at an inlaid disk electrode charges anomalously in response to a potential step. A numerical simulation of the problem shows that the overall current versus time transient differs little from that for a single resistor in series with a single capacitor. Nevertheless, the charging process, away from the disk s perimeter, differs surprisingly from what might be expected in that the current density initially increases with time. 2004 Elsevier B.V. All rights reserved.
منابع مشابه
Preparation and Characterization of Reduced Graphene Oxide Doped in Sol-Gel Derived Silica for Application in Electrochemical Double-Layer Capacitors
In this study, a new graphene ceramic composite (GCC) was prepared based on the reduced grapheneoxide (rGO) doped in sol-gel derived silica. The GCC was prepared by dispersing rGO nanosheets intothe sol-gel precursors containing methyl triethoxysilane, methanol and hydrochloric acid solution.During an acid catalyzed hydrolyze reaction and gelation proc...
متن کاملTowards understanding the structure and capacitance of electrical double layer in ionic liquids
In order to understand basic principles of the double layer formation in room temperature ionic liquids, we have performed Molecular Dynamic simulations for a simplified system: dense assembly of charged Lennard-Jones spheres between charged walls. For simplicity, in this first investigation we have considered the cations and anions of the same size. We have calculated the corresponding values ...
متن کاملKinetic Study of the Electrocatalytic Oxidation of Acetaldehyde at Ni/Al Layered Double Hydroxide Modified sol-gel derived carbon ceramic electrode
In this research, we reported a novel modified carbon ceramic electrode (CCE) using Ni/Al Layered double hydroxide as modifier was fabricated by sol-gel technique. The Ni/Al Layered double hydroxide modified sol gel derived carbon ceramic (Ni/Al LDH-SGD-CC) electrode was used for electrocatalytic oxidation of acetaldehyde. The oxidation of acetaldehyde happens at the potential where Ni (III) sp...
متن کاملUsing electrochemical impedance spectroscopy of salicylate anion selective electrode: simulation for behavior of electrode
In this paper, the behavior of the salicylate anion-selective electrode was studied using the electrochemical impedance spectroscopy technique. Considering the diagram of the charge transfer resistance and -logarithm of the double layer capacitance versus -logarithm of the concentration, linear range concentration increased to 1.0×10^{-8}-1.0×10^{-1} M and 1.0×10^{-9}-1.0×10^{-1} M, respectivel...
متن کاملDiffuse Charge and Faradaic Reactions in Porous Electrodes Accessed Terms of Use Detailed Terms Diffuse Charge and Faradaic Reactions in Porous Electrodes
Porous electrodes are widely used in electrochemical systems instead of flat electrodes to boost storage capacities for ions and electrons, to improve the transport of mass and charge, and to enhance reaction rates. Existing porous electrode theories make a number of simplifying assumptions: (i) The charge-transfer rate is assumed to depend only on the local electrostatic potential difference b...
متن کامل