CAJ | 학술논문

采用线性扫描伏安法研究了Lewis酸性AlCl3-BMIC (BMIC:1-butyl-3-methylimidazolium chloride)离子液体中铝电极的溶解.铝电极在阳极极化时出现了钝化现象,钝化是由于在铝电极表面形成了固体AlCl3钝化膜造成的.铝的电化学溶解过程可以依次分为三个区:电化学控制区、过渡区和钝化区.在电化学控制区,铝的电化学溶解速率随着电位的正移而逐渐增加;在过渡区,由于电极表面AlCl4-和Al2Cl7-浓度发生改变而析出固体AlCl3使得铝电化学溶解速率随着电位的正移而逐渐减小;当钝化膜形成之后,铝的电化学溶解速率不再随着电位的正移而发生改变,铝溶解进入钝化区.增加搅拌、升高温度、降低离子液体AlCl3摩尔分数都可以增加铝溶解阳极极限电流密度.
채용선성소묘복안법연구료Lewis산성AlCl3-BMIC (BMIC:1-butyl-3-methylimidazolium chloride)리자액체중려전겁적용해.려전겁재양겁겁화시출현료둔화현상,둔화시유우재려전겁표면형성료고체AlCl3둔화막조성적.려적전화학용해과정가이의차분위삼개구:전화학공제구、과도구화둔화구.재전화학공제구,려적전화학용해속솔수착전위적정이이축점증가;재과도구,유우전겁표면AlCl4-화Al2Cl7-농도발생개변이석출고체AlCl3사득려전화학용해속솔수착전위적정이이축점감소;당둔화막형성지후,려적전화학용해속솔불재수착전위적정이이발생개변,려용해진입둔화구.증가교반、승고온도、강저리자액체AlCl3마이분수도가이증가려용해양겁겁한전류밀도.
The dissolution process of an aluminum electrode in Lewis acidic ionic liquid aluminum chloride (AlCl3)-1-butyl-3-methylimidazolium chloride (BMIC) was studied using linear sweep voltammetry. Passivation was observed upon anodic polarization of the aluminum electrode that was caused by formation of a solid AlCl3 layer on the surface of the aluminum electrode. The electrochemical dissolution process of aluminum can be divided into electrochemical y-control ed, transition, and passivation regimes. In the electrochemical y-control ed regime, the dissolution rate of aluminum increased with increasing potential. In the transition regime, the dissolution rate of aluminum decreased as the potential increased because of the formation of solid AlCl3 caused by changes in the concentration of AlCl4-and Al2Cl7-. After a passivation layer formed, the dissolution rate of aluminum depended on the diffusion of AlCl4- was independent of potential; that is, the electrochemical dissolution process entered the passivation regime. The anodic limiting current density increased with agitation, increasing temperature, and decreasing mole fraction of AlCl3 in the ionic liquid.