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- Báo cáo Hiện tượng biến động oxi hóa - khử PANi trong quá trình tổng hợp điện hóa bằng phương pháp CV
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- Tap chi H6a hoc, T. 46 (3), T,.. 274 - 280, 2008
.. ,.'... , " )
HII;:N TUQNG BIEN DQNG OXI HOA - KHV PANi TRONG
, ... 10.') .. ,~ .-
QUA TRINH TONG HQP DII;:N HOA BANG PHUONG PHAP CV
Del, Too S0(111 1-2007
LE XUAN QUE, DINH v AN DONG
Vi¢1I Ky thudt Nhiet Mi. Vi¢1I KIIOO hoc Vii C611g IIgh¢ Viet Nom
SUMMARY
Polyanilinc (PANi) has been electrochemically synthesized on stainless steels electrode in
H ~O -J solution using 8" technique with maximum polarisation potential EIIl,u = 1.0 VISCE.
During the synthesis 3 couples of PANi redox reactions occur at suitable potentials. The redox
reactions have been affected increasing corresponding energy barrier leading to displace forward
the characteristic CV peaks according to CV scanning direction. The redox peaks modification
has been studied in detail using a variation of peak potentials and currents as a Junction of CV
cycles number. Some redox reactions can be continuously propagated but the others have been
degraded during CV polarisation. It is [ound that at suitable Emu.\' the disappeared redox peaks
can be restored to their sites at nearly original potential. Correlation between redox modification
and structure of PANi has been also discussed.
1 - GI61 THIEU
Polyanilin (PANi) la polymc dan dien quan trong nha: trong s6 cac polyme dan dien, eo
cong thirc cau tao co ban dang
(I)
gam cac don vi khir hoan toan
H H
~~-o-~-
(2)
va oxi hoa hoan toan
dan xen nhau [I - 4].
Dang khu hoan to an eo cau true CO ban cua polyanilin thong thuong khong dan dien, diroc
goi la leueoemeraldine (cong thirc (I) voi y = 1):
274
nguon tai.lieu . vn