作　　者： ; ; ;

机构地区： 华南理工大学材料科学与工程学院

出　　处： 《应用化学》 2004年第3期251-255,共5页

摘　　要： 用研磨抛光的方法制备了Pt研磨微电极 ( 0 1mm ) ,将其用于研究Bi2 O3 粉末在强碱性溶液中的循环伏安行为 ,结果表明 ,Pt研磨微电极可以大幅度提高测量速度。SEM研究表明 ,该电极上的Bi2 O3 粉末在9mol/L溶液中连续浸泡 15h ,并进行 10周循环伏安扫描后电极上仍有Bi2 O3 粉末存在。在研磨微电极和粉末微电极上所作的循环伏安曲线在Bi2 O3 的还原 /氧化峰电位、峰电流变化规律等方面有较好的一致性 ,表明可以用研磨微电极代替粉末微电极进行电化学实验。OH-浓度对Bi2 O3 的循环伏安行为有影响 ,说明KOH参与了Bi2 O3 的电化学反应 ,从而证明文献中使用粉末微电极所得循环伏安曲线出现的氧化平台是由于电极凹槽中OH-浓度持续变化造成的 ,而盘状研磨微电极上不存在凹槽 ,其循环伏安曲线上不出现平台。 The Pt microelectrode(=0.1 mm), made by abrasive polishing method with Bi 2O 3 powder was used to study cyclic voltammetric performance of Bi 2O 3 particles in alkaline solutions. The electrochemical measurments could be more quickly carried out than that by using composite electrode and cavity microelectrode. The SEM results showed the Bi 2O 3 particles were still present on the abrasive microelectrode after immersing in 9 mol/L KOH for 15 h and 10 times voltammetric cycling. The redox potential and current of main cycle voltammograms are comparably identical for both abrasive microelectrode and cavity microelectrode. It was found that OH - concentration could influence CV performance of Bi 2O 3, indicating that OH - is involved in the electrochemical reaction of Bi 2O 3. So the plateau peak on CV curves reported in some literatures can be explained in terms of the continuous change of OH- concentration in the cavity of microelectrode, no plateau was observed with disk-like abrasive microelectrode.

关 键 词： 微电极 氧化铋 循环伏安

领　　域： [理学] [理学]