Galvanostatic polarization

Figure 5.37 reveals some additional interesting, although well expected, features and provides additional proof for the oxygen ion backspillover mechanism Upon anodic galvanostatic polarization, the Zr 3ds/2 electron... 

In one of the cells (cathode chamber), conditions are such that the hydrogen evolution reaction occurs. This may be due to potentiostatic or galvanostatic polarization, or corrosion of the metal in an acidic solution. 

Figure 4. Galvanostatic polarization curves for the metal fluoride impregnated carbon in the fluorine cell...

Figure 38. The voltage response on a galvanostatic polarization of a mixed conductor with ion-blocking electrodes ( eqc. (G3)3,15). Reprinted from J. Maier, Evaluation of Electrochemical Methods in Solid State Research and Their Generalization for Defects with Variable Charges , Z. Physik. Chemie N.F., 191-215, Copyright 1984 with permission from Oldenbourg Verlagsgruppe.

Figure 2. XRD patterns measured ex-situ from graphite particles and chronopotentiograms of graphite electrodes polarized galvanostatically from OCV to low potentials in CHj-OCH2CH2-OCF[2CF[2-OCF[ (diglymej/LiClO solution (a) and in PC/LiAsF solution (b). The letters near the V vs. capacity curves correspond to the relevant XRD patterns, which have been measured after different periods of galvanostatic polarizations. Notice that in the diglyme solution (a) the XRD patterns clearly indicate progressive destruction of the active mass, while in the PC solutions (b) the XRD patterns show that the active mass remains pure graphite.

Figure 18. Permanent EP polarization and relaxation transient of the rate of ethylene combustion on lr02/YSZ catalyst due to galvanostatic polarization with +300 pA. Conditions PC2H4 = 0.14kPa,po2= 17kPa,and r=380°C.

Figure 21. Electrochemical promotion of Na (A) and CO2 (B) production over the active (a) and the deactivated (d) Rh/YSZ catalyst during a galvanostatic polarization cycle. Anodic current application (+5 pA) at t = 0 min current interruption aU = 90 min. Feed composition as in Figure 20, 7"= 300°C.

Figure 22. Effect of the duration of galvanostatic polarization on the reversible (EP,) and the irreversible (EP ) part of electrochemical promotion over deactivated Rh/YSZ catalyst. APn2 the increase in N2 production due to polarization with respect to the open-circuit value. Anodic current application (+5 pA) at / = 0 min current interruption at / = 60,90 and 120 min. Feed composition and temperature as in Figure 20.

Steady-state galvanostatic polarization measurements were conducted on a series of aqueous solutions of organic compounds in contact with Pt-alloy-type gas diffusion electrodes under acidic conditions to characterize their electro-oxidation behavior. A number of potential fuels were studied, including dioxane, tetrahydrofuran, 1,2-dimethoxyethane, dimethoxymethane, trimethyl orthoformate, trioxane, and methanol, and prepared in dilute aqueous solutions of sulfuric acid and triflic acid. Many polarization measurements were in the... 

Fig. 1.12 Steady-state galvanostatic polarization curves for the oxidation of 1 M solutions of the following fuels 1,4-dioxane, tetrahydrofuran (THF), 1,2-dimethoxyethane (DME), and dimethoxymethane (DMM) on Pt/Sn gas-diffusion electrodes in 0.5 M sulfuric acid + 0.01 M CgFiySOgH at 55 °C. 

Fig. 1.17 Steady-state galvanostatic polarization curves for the oxidation of trioxane at 55 °C at various concentrations on Pt/Sn electrodes in 2.0 M sulfuric acid and 0.01 M C8-acid. 

Fig. 1.21 Steady-state galvanostatic polarization curves for the oxidation of...

Each of the above electrode systems has its own specific properties determined by the phases constituting the respective electrode system. The Pb/PbO/PbS04 system is formed both during potentiostatic and galvanostatic polarization of the electrodes, but the relative share of the PbO and PbS04 layers depends on the polarization mode. 

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