Zinc Electrodes and the Thermodynamics of a Galvanic Cell

Autor:	Giles Henderson, Donald A. Probst
Rok vydání:	1996
Předmět:	Mineralogy chemistry.chemical_element General Chemistry Zinc Electrolyte Education Anode Surface coating chemistry.chemical_compound chemistry Chemical engineering Zinc hydroxide Electrode Galvanic cell Current (fluid)
Zdroj:	Journal of Chemical Education. 73:962
ISSN:	1938-1328 0021-9584
DOI:	10.1021/ed073p962
Popis:	Although zinc is commonly employed as an electrode in laboratory studies of galvanic cells, we find that under ambient conditions, this electrode may be poisoned by a surface coating on zinc hydroxide. The formation of a strongly adhering, non conducting surface film impedes current flow and causes measured cell potentials to ramp downward with time. Thermodynamic calculations and laboratory experiments confirm that this difficulty can be completely eliminated by buffering the anode electrolyte at pH = 4.0.
Databáze:	OpenAIRE
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