In situ Monitoring of the Rising of Aqueous Solution Meniscus for a Partially Immersed Silver Electrode during Electrochemical Reduction of Oxygen

• 来源期刊: 中国化学（英文版）
• 学科: 化学
• 年，卷（期）: 2001,（11）
• 页码范围: 1070-1079
• 页数: 10页
• 分类号: O6
• 语种: 英文

摘要

Rising phenomena of aqueous solution meniscus were found for the silver electrode of a 5 MHz piezoelectric quartz crystal (PQC) partially immersed in Na2SO4, NaClO4, HClO4 and NaF aqueous solutions at oxygen reduction potentials, respectively. A detailed study revealed that a decrease in contact-angle hysteresis ( or a contact-angle decrease) and a continued collection of the water product at the solid-gas-solution interface during oxygen reduction, rather than the electrocapillary effect and an agitation effect induced by the oscillation of PQC, are responsible for the meniscus- rising phenomena. In addition, in situ determination of the immersed height of a partially immersed Ag electrode was studied on the basis of simultaneous measurements of the electroacoustic admittance and electrochemical impedance.