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Citation: JIANG Li-Min, WANG Han-Dan, YANG Yong-Sheng, LI Wei, PENG Shu-He, TIAN Zhao-Wu. pH Measurement on Oxidation Electrode Surface of Primary Alcohols and Its Application[J]. Chinese Journal of Applied Chemistry, ;2009, 26(11): 1345-1348. shu

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

1.
a School of Material Science and Engineering, Nanchang Hangkong University, Nanchang 330063;
2.
b College of Chemistry and Chemical Engineering, Xiamen University, Xiamen

Corresponding author: JIANG Li-Min,
Received Date: 29 October 2008
Available Online: 20 April 2009
Fund Project: 航空基金(04H56011) (04H56011)江西省材料工程中心基金(ZX200301013) (ZX200301013)

pH-open circuit potential relationship was investigated for Ir/IrO₂ micro plane pH sensing electrode on the primary alcohols oxidizing electrode surface.pH value at a distance apart from oxidizing electrode surface within 50 μm was measured 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 reveals that the relationship between "pH-open circuit potential" of the Ir/IrO₂ micro plane electrode is related to the kind of "alcohol-carboxylic acid" system.The H⁺ concentration generated by electrochemical oxidation of glycol is the highest,methanol's comes the second,and ethanol's is the lowest.Under steady state diffusion,their pH values were 0.191,1.13 and 2.99 at 500 nm from oxidizing electrode surface respectivly.Through the addition of NaF in the electrolyte,the selective micro-area etching function of HF formed by the association of H⁺ and F^- for titanium was examined.In the glycol oxidation system,the etching rate for microhole on titanium was about 30 nm/min.
- primary alcohols,
- electrooxidation,
- pH measurement,
- Ir/IrO₂ micro plane electrode,
- etching
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