전기화학8

전기화학8

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1 Electrochemical Measurements 1. Introduction Electrochemistry study of the electrochemical response of a system to an electrical stimulation loss of electrons (oxidation) gain of electrons (reduction) Experimental Parameters § Potential(E) : amount of electrical force or energy in a system (V) § Current(I) : magnitude of the electron flow in a system (A) § Charge(Q) : measure of the number of electrons used per equivalents (1 F = 96,485 C/mol) § Time(t) : measurement of duration (t) Introduction
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Potential Step Method Chronoamperometry The electrochemical cell is considered as a “black box” to which a certain excitation function (e.g., a potential step) is applied and a certain response function (e.g., resulting current with time) is measured. 1) Potentiostatic Experiment (Potentiostat) The potential may be held constant or may be controlled with time in a determined manner, and then the current is measured as a function of time or potential. 2) Galvanostatic Experiment (Galvanostat) The current is controlled (frequently held constant), and the potential becomes the dependent variable, which is determined as a function of time. ※ Excitation may be simple or complex.
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전기화학8

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