Anodization and Speciation of Magnesium in Chloride‐Rich Room Temperature Ionic Liquids
Anodization and Speciation of Magnesium in Chloride‐Rich Room Temperature Ionic Liquids
复制标题
富氯室温离子液体中镁的阳极氧化和形态形成
DOI：
10.1149/1.1838204
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发表时间：
1998
影响因子：
3.9
通讯作者：
R. Mantz
中科院分区：
文献类型：
--
作者：
J. Fuller;R. T. Carlin;R. Osteryoung;Peter Koranaios;R. Mantz
研究了在室温AlCl 3：EMIC和AlCl 3：DMPIC离子液体（EMIC = 1-乙基-3-甲基咪唑氯化物，DMPIC = 1，2-二甲基-3-丙基咪唑氯化物）中镁的阳极氧化.对于所有熔体，AlCl 3：有机氯化物摩尔比<1，产生富氯化物（即，基本）组成。镁阳极氧化速率受氯离子向电极表面扩散的限制。根据在Mg盘电极上镁阳极氧化和在Pt盘电极上氯氧化的Cottrell斜率，确定AlCl 3：EMIC中阳极氧化过程的氯化学计量为4.1（± 0.5），对应于可溶性MgCl 42的形成。在AlCl 3：DMPIC中发现了类似的氯化物化学计量比。MgCl 2将熔体从碱性侧缓冲至接近中性，溶解为MgCl 4 2-。金属镁在碱性AlCl 3：DMPIC中化学稳定，但与碱性AlCl 3：EMIC反应完全且不可逆，生成有色有机副产物。对NiCl 2和CdCl 2在碱性熔体中的酸性作了评述.
Magnesium anodization was examined in room temperature AlCl 3 :EMIC and AlCl 3 :DMPIC ionic liquids, where EMIC = 1-ethyl-3-methylimidazolium chloride and DMPIC = 1,2-dimethyl-3-propylimidazolium chloride. For all melts, the AlCl 3 :organic chloride mole ratio was <1, yielding chloride-rich (i.e., basic) compositions. The rate of magnesium anodization was limited by diffusion of chloride ions to the electrode surface. From the Cottrell slopes for magnesium anodization at a Mg disk electrode and for chloride oxidation at a Pt disk electrode, the chloride stoichiometry of the anodization process in AlCl 3 :EMIC was determined to be 4.1 (± 0.5), corresponding to the formation of soluble MgCl 4 2 . Similar chloride stoichiometry was found in AlCl 3 :DMPIC. MgCl 2 buffers the melt to approximate neutrality from the basic side, dissolving as MgCl 4 2- . Magnesium metal was chemically stable in basic AlCl 3 :DMPIC, but it reacted completely and irreversibly with basic AlCl 3 :EMIC to produce colored organic byproducts. Some comments are made on the acidity of NiCl 2 and CdCl 2 in the basic melts.