BMIC离子液体中电沉积制备Ir层研究

Preparation of Iridium Layer by Electrodeposition in BMIC Ionic Liquid

摘要:

在BMIC离子液体中利用恒电压电沉积的方法在Pt 基体上制备出表面平整且相对比较致密的Ir层。利用扫描电子显微镜和能谱仪(EDS)对Ir层的表面形貌和成分进行了分析。结果表明：在纯BMIC离子液体中恒电压电沉积时无法获得Ir层；加入乙二醇和提高温度均能够有效提高IrCl3在BMIC离子液体中的溶解度，从而有利于电沉积获得Ir层；Ir层表面随着BMIC与乙二醇的摩尔比的增大而变得粗糙；过低的恒电压电沉积时无法获得Ir层，而过高的恒电压又会使获得的Ir层非常疏松；较低的电沉积温度得不到Ir层，而较高的电沉积温度所获得的Ir层裂纹较大

Abstract:

An even and compact iridium layer was prepared on a platinum substrate by electrodeposition under a constant voltage in an ionic liquid of 1-butyl-3-methylimidazolium chloride (BMIC). The surface morphology and composition of the iridium layer were characterized by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). Results show that iridium layer can’t be prepared in pure BMIC. Adidtion of ethylene glycol and an evaluated temperature could effectively improve the solubility of IrCl3 in BMIC, which is useful in preparing iridium layer. Iridium layer is obtained at the right voltage and no iridium is got on platinum under a low voltage. When the voltage is too high, the iridium layer becomes loose. When the molar ratio of BMIC to ethylene glycol increases, the surface of the iridium layer becomes rough. Iridium layer can not be achieved at lower temperature while at higher temperature a larger crack appears on the iridium layer