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that substance due to the electric field between the electrodes. The sign convention regarding current is such that the migration current is negative for the reduction of a cation or for the oxidation of an anion, and positive for the oxidation of a cation or the reduction of an anion. Hence the migration current may tend to either increase or decrease the total current observed. In any event the migration current approaches zero as the transport number of the electroactive substance is decreased by increasing the concentration of the
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The difference between the current that is actually obtained, at any particular value of the potential of the indicator or working electrode, for the reduction or oxidation of an ionic electroactive substance and the current that would be obtained, at the same potential, if there were no transport of
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to the electrode. It is independent of the applied potential over a finite range, and is usually evaluated by subtracting the appropriate residual current from the measured total current. A limiting current can have the character of an
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in electrochemistry is the limiting value of a faradaic current that is approached as the rate of charge transfer to an
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is increased. The limiting current can be approached, for example, by increasing the
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Douglas A. Skoog; F. James Holler; Stanley R. Crouch (27 January 2017).
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Electric current generated by a redox reaction at an electrode
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sum of all the faradaic currents flowing through an
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149:. Cengage Learning. pp. 576–.
146:Principles of Instrumental Analysis
202:Compendium of Chemical Terminology
47:. The net faradaic current is the
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170:Jack Cazes (30 November 2004).
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176:. CRC Press. pp. 534–.
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79:or decreasing the rate of
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124:Gas diffusion electrode
119:Butler–Volmer equation
107:supporting electrolyte
53:indicator electrode
77:electric potential
41:chemical substance
183:978-0-8493-9039-5
156:978-1-337-46803-9
100:Migration current
57:working electrode
31:generated by the
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233:Electrochemistry
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207:faradaic current
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69:limiting current
63:Limiting current
29:electric current
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130:References
86:adsorption
94:diffusion
90:catalytic
73:electrode
49:algebraic
45:electrode
37:oxidation
33:reduction
227:Category
113:See also
39:of some
27:is the
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43:at an
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