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| ELECTRODE IMPEDANCE MEASUREMENTS BY TIME DOMAIN METHOD Ⅱ. HARDWARE, SOFTWARE AND EXPERIMENTAL RESULTS |
| Wang Huixiang and Shu Yude(Central South University of Technology) |
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Abstract A sampling system was assembled with microcomputer, A/D & D/A converter and self-made amplifier & potentiostat. Software consisted of assembly and quick BASIC languages. The maximum sampling rate is 32μs/point. The response current to the step voltage perturbation was sampled, then the algorithm in part Ⅰ of this title was employed and interracial impedance in electrochemical systems was determined. Results of impedance measurements of some equivalent circuits and the Pt, Fe (CN)_6~(3-)/Fe(CN)_6~(4-) system agreed well with closed-form solutions or literature data, thus demonstrating the ability of the computerized measurement system. Measurements with CuSO_4+gelatin systems yielded the expected impedance. Nyquist plot exhibited sufficiently the effect of the dope concentration.
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Received: 25 August 1992
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