Linear scan voltammetry Electroanalytical methods that involve measurement of the current in a cell as the electrode potential is linearly increased or decreased with time the basis for hydrodynamic voltammetry and polarography. [Pg.1111]

Linear sweep voltammetry - linear scan voltammetry [Pg.402]

In linear scan voltammetry (LSV) the peak current of fast and reversible electrode reactions controlled by semi-infinite planar diffusion is given by the following equation [i] [Pg.487]

See also -> linear scan voltammetry, and - cyclic voltammetry. [Pg.516]

The theory for linear-scan voltammetry (LSV) and cyclic voltammetry (CV) for the CE mechanism uses a terminology in which [Pg.192]

Peak height (in -> voltammetry) — It is the maximum current in - linear scan voltammetry, -> cyclic voltammetry, - staircase voltammetry, - differential staircase voltammetry, -> alternating current polarography [Pg.487]

That there is no peak observed in the linear-scan voltammetry (LSV) scan can be understood because under the experimental conditions (rapid feeding of a small equilibrium amount of Yq to the electrode) there will be no depletion of Y near the electrode as the reduction proceeds. Also (2) i is independent of v, and (3) Ep shifts positive by 29/n mV for each tenfold increase in v through [Pg.193]

Potential at half-height — (in voltammetry) This is a diagnostic criterion in -> linear scan voltammetry. The potential at half-height Ep/2 is the potential at which the current is equal to one-half of the peak current fp Ep/2 = h (/=/p/2)- I he first of two potentials at half-height, the one that precedes the peak potential (Ep) is considered only. If a simple electrode reaction is reversible (- reversibility) and controlled by the planar, semi-infinite - diffusion, the absolute value of the difference between Ep/2 and Ep is equal to 56.6/n mV and independent of the - scan rate. If the -> electrode reaction of dissolved reactant is totally irreversible (-> reversibility), the difference Ep/2 - Ep is equal to 47.7/an mV for the cathodic process and -47.7/(l - a)n mV for the anodic process. [Pg.536]

Figure 2. Plot of X (at) (ordinate) vs. n(E — E, ) for a reversible system studied by linear-scan voltammetry. [Reproduced with permission from A. J. Bard, L. Faulkner, Electrochemical Methods. J. Wiley, New York, 1980, p. 219.] |

The convolution analysis is based on the use of convolution data and further manipulation to obtain information on the ET mechanism, standard potentials, intrinsic barriers, and also to detect mechanism transitions. It is worth noting that the general outlines of the methodology were first introduced in the study of the kinetics of reduction of terf-nitrobutane in dipolar aprotic solvents, under conditions of chemical stability of the generated anion radical. For the study of concerted dissociative ET processes, linear scan voltammetry is the most useful electrochemical technique. [Pg.99]

See also in sourсe #XX -- [ Pg.3 ]

See also in sourсe #XX -- [ Pg.3 ]

© 2019 chempedia.info