enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Butler–Volmer equation - Wikipedia

    en.wikipedia.org/wiki/Butler–Volmer_equation

    The upper graph shows the current density as function of the overpotential η . The anodic and cathodic current densities are shown as j a and j c, respectively for α=α a =α c =0.5 and j 0 =1mAcm −2 (close to values for platinum and palladium). The lower graph shows the logarithmic plot for different values of α (Tafel plot).

  3. Current density - Wikipedia

    en.wikipedia.org/wiki/Current_density

    In electromagnetism, current density is the amount of charge per unit time that flows through a unit area of a chosen cross section. [1] The current density vector is defined as a vector whose magnitude is the electric current per cross-sectional area at a given point in space, its direction being that of the motion of the positive charges at this point.

  4. Exchange current density - Wikipedia

    en.wikipedia.org/wiki/Exchange_current_density

    The Tafel equation describes the dependence of current for an electrolytic process to overpotential. The exchange current density is the current in the absence of net electrolysis and at zero overpotential. The exchange current can be thought of as a background current to which the net current observed at various overpotentials is normalized.

  5. Tafel equation - Wikipedia

    en.wikipedia.org/wiki/Tafel_equation

    The Tafel equation is an equation in electrochemical kinetics relating the rate of an electrochemical reaction to the overpotential. [1] The Tafel equation was first deduced experimentally and was later shown to have a theoretical justification. The equation is named after Swiss chemist Julius Tafel.

  6. Charge density - Wikipedia

    en.wikipedia.org/wiki/Charge_density

    The charge density appears in the continuity equation for electric current, and also in Maxwell's Equations. It is the principal source term of the electromagnetic field; when the charge distribution moves, this corresponds to a current density. The charge density of molecules impacts chemical and separation processes.

  7. Partial current - Wikipedia

    en.wikipedia.org/wiki/Partial_current

    In the case of the cathodic partial current density being equal to the anodic partial current density (for example, in a corrosion process [3]), the net current density on the electrode is zero: [2] i eq = i c,eq + i a,eq = 0. When more than one reaction occur on an electrode simultaneously, then the total electrode current can be expressed as: [1]

  8. Electron mobility - Wikipedia

    en.wikipedia.org/wiki/Electron_mobility

    The current carried by each electron must be , so that the total current density due to electrons is given by: = = Using the expression for gives = A similar set of equations applies to the holes, (noting that the charge on a hole is positive).

  9. Cyclic voltammetry - Wikipedia

    en.wikipedia.org/wiki/Cyclic_voltammetry

    The current density is normalised by 0.446 F C sqrt(D F nu / R T). Reductive current counted as negative. Often the analyte displays a reversible CV wave (such as that depicted in Figure 1), which is observed when all of the initial analyte can be recovered after a forward and reverse scan cycle.