Nghiên cứu chế tạo vật liệu pha tạp Mn
1-x
M
x
O
1+y
.nH
2
O bằng phương pháp điện hoá ứng dụng làm vật
liệu siêu tụ, M= Co, Fe
Luận văn cao học Lê Thị Thu Hằng
ABSTRACT
Advantages of manganese dioxide are the lower cost for raw materials
and the fact that manganese-based capacitors are environmentally benign in
the point of view that they can operate in neutral solution. In order to futher
improve the pseudocapacitive performance of Mn oxide, the addition of other
transition metal oxides has been attemtped such as: Fe and Co oxides.
However, the effects of Co oxide and Fe oxide addition were reported, and
the experience results from different research groups varied significiantly.
In our country, there isn't any report reseaching this doped manganese for
supercapacitors. The object of this thesis is "Reseach on preparation doped
Mn
1-x
M
x
O
1+y
.nH
2
O electrodeposit for supercapacitive application, M=
Co, Fe ".
Experimental methods: Scanning electron microscope, X-ray diffraction, X-
ray energy dispersive spectroscope, chemical analyses, cyclic voltametry,
electrochemical impedance spectroscopy.
Conclusions
Doped Mn oxide exhibits ideal pseudocapacitive properties, a very large
specific capacitance and excellent reversibility within a large potential
window (1V). Co, Fe doping has been found to significantly enhance the
redox reversibility as well as specific capacitance of mangan dioxide. The
specific capacitance of this oxide depends on not only doping content but also
sweep rate. The results obtained show that Co, Fe doping has benefit for
mangan dioxide to apply supercapacitive electrode material.
Key words: supercapacitors, Mn-Fe oxide, Mn-Co oxide,
pseudocapacitive
