Anode electrochemical equivalents

Metal anode Electrochemical equivalent of metal, Ah/g Theoretical cell voltage, V Valence change Theoretical specific energy (of metal), kWh/kg Practical operating voltage, V... 

The electrochemical equivalent of the lead is the lowest of all metallic anodes (260 Ah/kg) but in many applications the high open-circuit voltage of 2.1 V per cell compensates for this disadvantage. 

The electrochemical equivalent of 3860 Ah/kg is the highest among all metal anodes and the open-circuit voltage of 2.7-2.8 V (depending on electrolyte concentration) is rather high too. 

Magnesium is a reactive metal with relatively high electrochemical equivalent of 2.2 Ah/g and low specific gravity 1.74 g/cm3 its price is not high. This makes magnesium suitable for use as anode in metal-air cells. 

D. R. TURNER The difference between the two materials lies in the formation of a thick anode film on silicon. Once this film is removed and electropolishing occurs, the mechanism of dissolution is, I believe, quite similar. The amount of material etched electrolytically per coulomb of electricity is related to electrochemical equivalent/density. The electrochemical equivalent for Ge is about twice that of Si, but the density of Ge is about 2 times that of Si so etch rates are about the same. 

The electrical potential of tungsten in solutions of different acids, bases, and salts has been measured against certain standard electrodes at 25 C. The tungsten does not behave as an insoluble electrode, but sends ions into the solutions. Under certain specified conditions— for examine, with high-current densities (2 amperes per square decimetre) in aqueous alkalis, but with low-current densities in aqueous solutions of acids and salts—-the tungsten anode becomes passive. The passivity appears to be due to adherent films of hydrated oxides. The electrochemical equivalent of tungsten has been found to be 0-3178 mg. per coulomb," which is in close agreement with the theoretical value. 

The equilibrium, I2 + I = Ia, exists in these solutions, but. this does not affect the stoichiometrical relations. After the electrolysis is completed, a delivery tube is connected to D, and the anode and cathode portions of the electrolytes are drawn over into separate flasks. The two portions are then titrated for iodine with arsenious acid solution which lias been standardized against carefully purified iodine. By comparison with the silver coulometer, Bates and Vinal8 found the electrochemical equivalent of iodine to be 0.00131505 gram per coulomb, leading to a value of the faraday of 96,514. The accuracy of the experimental work may be judged from the results for the different experiments given in Table I. 

The dynamic model for the rotating- anode electrochemical reactor is based upon a differential mass balance for Ag(II) and organics [13]. The rate of accumulation of the i-th reactant in the anolyte, VdC/dt, is equivalent to the difference between generation and loss terms ... 

Table9.12. Electrochemical equivalents of common anode and cathode materials used in primary and secondary cells (293.15 K and 101.325 kPa)...

Although much less significant than the catalyst poisoning by CO, anode performance is adversely affected by the reaction of CO2 with adsorbed hydrides on platinum. This reaction is the electrochemical equivalent of the water gas shift reaction. 

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