低碳醇氧化电极表面pH值的测量及应用

研究了Ir/IrO₂微平面电极在低碳醇氧化电极表面的pH-E_ocp（pH-开路电位)关系，测量了几种低碳醇在电化学氧化过程中距离电极表面50 μm以内的不同距离处的pH值，对不同低碳醇电化学氧化产生的酸强度进行了比较与分析；Ir/IrO₂微平面电极的pH-E_ocp关系曲线与“醇-羧酸”体系种类有关；乙二醇在电化学氧化过程中产生的pH值最低，甲醇次之，乙醇产生的pH值最高，在500 nm处的稳态pH值分别为0.191、1.13和2.99。通过向电解液中加入NaF，考察了生成的H⁺和F^-结合对金属钛选择性微区刻蚀作用，在乙二醇为前驱体的体系中微孔刻蚀加工速率约为30 nm/min。

pH Measurement on Oxidation Electrode Surface of Primary Alcohols and its Application

"pH- open circuit potential" relationship was investigated for Ir/IrO2 micro plane pH sensing electrode in the solution systems composed of different primary alcohols and their electrochemically oxidized products carboxylic acids. pH variation with the distance apart from electrode surface within 50 μm was measured in situ during electrochemical oxidation of three primary alcohols. Comparison and analysis were made for the H+ concentration generated by electrochemical oxidation of the primary alcohols. The experiment revealed that the relationship of "pH- open circuit potential" of the Ir/IrO2 micro plane electrode was related to the kind of the "alcohol-carboxylic acid" system. The H+ concentration generated by electrochemical oxidation of glycol was highest, methanol comes second, and ethanol’s was lowest. Through the addition of NaF in the electrolyte, the selective micro-area etching function for titanium was examined by means of HF generated through metathytical reaction between organic acid and the NaF.