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Mg electrodes were studied in a variety of polar aprotic electrolyte solutions, using cyclic voltammetry (CV), impedance spectroscopy (EIS), surface sensitive FTIR spectroscopy, element analysis by dispersive X-rays (EDAX), scanning electron microscopy (SEM), and electrochemical quartz crystal microbalance (EQCM) studies. The solutions included Mg, Li, Na, K and Bu₄N⁺ salt solutions in acetonitrile (AN), propylene carbonate (PC) and tetrahydrofuran (THF). In addition, THF+RMgX (R=alkyl, X=Cl, Br) solutions were studied. This paper aims at providing a general description of the electrochemical behavior of Mg electrodes in different types of polar aprotic systems. It appears that Mg electrodes are spontaneously covered by surface films in most of the solutions studied. In AN and PC, solvent reduction seems to dominate surface film formation, while in THF, the solvent is inactive and, thus, reduction of salt anions …