压粉法制备微型Sb/Sb2O3固体pH电极

目的研究压粉法制备微型Sb/Sb2O3全固态pH电极,克服玻璃电极的不足。方法压粉法制备Sb/Sb2O3固体pH电极,利用扫描电子显微镜、X射线衍射研究电极表面成分分布与特征,利用电位法、循环伏安法、断电流法对所制备的电极性能进行研究评价。结果该电极的有效成分均匀分布于电极表面,电极活化时间小于200 s。在pH值为1.0~5.0范围内有良好的线性响应,其响应斜率为-32.87 m V/pH。该电极具有良好的抗离子干扰能力和可逆性,循环伏安测试证实了该电极的电极反应,将该电极应用于溶液pH值的测量,与玻璃电极相比误差约为0.05,满足测量的需求。结论利用压粉法成功制备了Sb/Sb2O3固体pH电极。

Evaluation of a New Sb/Sb2O3 pH Electrode Prepared by Isostatic Compaction

Objective To study the preparation of micro Sb/Sb2O3 solid-state pH electrode to overcome the defect of glass electrode. Methods The Sb/Sb2O3 pH electrode was fabricated by isostatic compaction. Distribution and characterization of surface composition were evaluated by scanning electron microscope and X ray diffraction. The performances of the electrode were evaluated by potentiometric method, cyclic voltammetry and current interrupt technique. Results The effective components of the electrode were evenly distributed on the surface of the electrode. The activation time of the Sb/Sb2O3 pH electrode was less than 200 s. The Sb/Sb2O3 pH electrode had a responsive slope of -32.87 mV/pH in the working range from pH 1.0 to pH 5.0. This electrode showed excellent anti ion interference and superb reversibility. The cyclic voltammetry results confirmed the reaction occurred on the surface of this electrode. The measurement error between Sb/Sb2O3 pH electrode and glass electrode was about 0.05 when measuring pH values of solutions. This electrode met the measurement requirements. Conclusion The Sb/Sb2O3 pH electrode was fabricated successfully by isostatic compaction.