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In situ monitoring of the rising of aqueous solution meniscus for a partially immersed silver electrode during electrochemical reduction of oxygen
Author(s) -
Xie QingJi,
Zhang YouYu,
Guo YangHui,
Su XiaoLi,
Li YunLong,
Yao ShouZhuo
Publication year - 2001
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20010191112
Subject(s) - chemistry , aqueous solution , meniscus , electrochemistry , electrode , analytical chemistry (journal) , contact angle , hysteresis , wetting , oxygen , oscillation (cell signaling) , inorganic chemistry , chemical engineering , optics , chromatography , physics , incidence (geometry) , quantum mechanics , organic chemistry , engineering , biochemistry
Rising phenomena of aqueous solution meniscus were found for the silver electrode of a 5 MHz piezoelectric quartz crystal (PQC) partially immersed in Na 2 SO 4 , NaClO 4 , HClO 4 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.