Galvanostatic current-pulse method

Galvanostatic current-pulse method, 38 29, 33 Galvanostatic technique hydrocarbon adsorption, 30 256 surface coverage, 30 299-300 Gamma emission, 26 124, 125, 127 Garin-Gault mechanism, 30 20, 23 Gas chromatography -atomic emission detection... 

Galvanostatic Transient Technique. In the galvanostatic method a constant-current pulse is applied to the cell at equilibrium state and the resulting variation of the potential with time is recorded. The total galvanostatic current ig is accounted for (1) by the double-layer charging, /ji, and (2) by the electrode reaction (charge transfer), i. ... 

For the study of diffusion phenomena in solids it is also possible to work with potential pulses (potentiostatic pulses) or with constant current pulses (galvanostatic pulses). Examples described in the following paragraphs are based on the coulometric titration method described in Chapter 3. Weppner and Huggins reviewed these methods.In a continuous series of pulses the concentration of lithium in a sheet of aluminum is increased. The diffusion in each pulse is followed by either potential or current measurements. 

In the galvanostatic pulse method (GSPM) [37], lithium is inserted into (and extracted from) the surface layer of the electrode by a short rectangular current pulse i. The charge transfer step is presumed fast and the measured electrode potential is entirely determined by the surface concentration of lithium. During the... 

This assertion is supported by the data in Table 1 concerning the behaviour of ARMCO iron in 1 m HCl solutions at various temperatures [40]. The direct evaluation of the corrosion current density. Id, was obtained from the determination of the concentration of ferrous ions, entered the solution, by the spectrophotometric technique. The galvanostatic pulse polarization curves were performed using the CORRCONTROL system [41] and the GALIMP program [42]. The corrosion current density, Ic, was computed using the NOLI method [34]. 

The determinations of R which was made using high-frequency alternating current, showed that its value was approximately 0.3 H. The polarization curves were performed using the galvanostatic pulse technique and their geometric shapes were analyzed by the NOLI method [34],... 

Several techniques have been developed for the investigation of the rate of nucleation. Earlier methods were based on galvanostatic techniques. The first to use this technique were Samartzev and Evstropiev. Later it was developed and refined in experiments of Schottky and Gutzow but, because of the high sensitivity of the nucleation process on overpotential, the results are difficult to interpret. Potentiostatic techniques gave more comprehensible results. The simplest potentiostatic technique, used by Kaischew, Scheludko, and Bliznakov and by Scheludko and Bliznakov, is to apply an overpotential pulse to the electrode and to measure the time at which current is observed to flow. The technique allows an estimate to be made of the time lag n needed for the formation of the first nucleus. The identification of Ti with meets some difficulties connected with nonstationary processes discussed in detail by Toschew. ... 

Fig. 75. The dependence of current on time of the double pulse galvanostatic method.

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