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Electrochemical and Photoelectrochemical Study of Self‐assembled Monolayer of Phytic Acid on Brass
Author(s) -
XU QunJie,
WAN ZongYue,
ZHOU GuoDing,
YIN RenHe,
CAO WeiMin,
LIN ChangJian
Publication year - 2008
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.200890285
Subject(s) - chemistry , electrochemistry , monolayer , phytic acid , photocurrent , electrode , reagent , inorganic chemistry , polarization (electrochemistry) , adsorption , brass , chemisorption , self assembled monolayer , organic chemistry , optoelectronics , copper , materials science , biochemistry
Phytic acid is an environment‐friendly reagent for processing metals. The anticorrosion and inhibiting mechanism for phytic acid monolayers self‐assembled on a brass (HSn70‐1) electrode has been investigated by using electrochemical and photocurrent response methods. The electrochemical measurements indicate that phytic acid is liable to form surface complexes on the brass electrode, and the self‐assembled monolayers (SAM) change the structure of the electric double‐layer and shift the potential of zero charge positively. The photochemical measurement indicates that the brass electrode shows a p ‐type photoresponse owing to the formation of a Cu 2 O layer on its surface, and the presence of SAM weakens significantly the photoresponse, suggesting an excellent effect on anticorrosion, which is consistent with the EIS and polarization curve measurements. Adsorption of phytic acid was found to be typical of chemisorption, which can be reasonably described on the basis of the Langmuir isotherm.