β Scribed by David L. Mcallister; Glenn Dryhurst
No coin nor oath required. For personal study only.
In cyclic voltamrnetric studies it is frequently desirable to examine the currentpotential curve on the second, third or later potential cycles in order to gain information about intermediates, unstable products or follow-up chemical reactions giving rise to electroactive products . At slow sweep rates (500 mV s -' or less) it is possible to record only the cycles of interest by manual switching of either the recorder or in some instances the potentiostatic instrumentation . However, at higher sweep rates some type of electronic switching becomes necessary and the voltammograms must be recorded on an oscilloscope .
Reported here is such an electronic switching device which, when used in conjunction with the function generator described by Myers and Shain', permits display of any selected potential cycle (or cycles) through the fifth cycle at sweep rates of up to 1000 V s -' . It is our experience that after the fifth cycle the vast majority of voltammograms exhibit a steady-state form, i.e., they change very little upon further cycling .
In order to keep circuit design and construction to a minimum, printed circuit modules and integrated circuits, were used extensively .
Circuit design and operation
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