Tài liệu Báo cáo " Hiện tượng biến động oxi hóa - khử PANi trong quá trình tổng hợp điện hóa bằng phương pháp CV " doc

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 vAN 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-~-
va oxi
hoa
hoan
toan
(2)
dan
xen nhau [I - 4].
Dang
khu
hoan toan eo cau true CO ban
cua
polyanilin thong thuong khong dan dien, diroc
goi la leueoemeraldine (cong thirc
(I)
voi y = 1):
274