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E u r o s c i c o n C o n f e r e n c e o n
Physical Chemistry and
Analytical Separation Techniques
October 08-09 , 2018
Amsterdam, Nether l ands
Journal of Organic & Inorganic Chemistry
ISSN: 2472-1123
Physical Chemistry and Analytical Separation Techniques 2018
T
he development of efficient, low-cost and stable electrocatalysts as the alternative to platinum for the oxygen reduction
reaction (ORR) plays key roles in several important energy storage and conversion technologies such as fuel cells, metal-
air batteries. Manganese oxides (MnOx) have been widely investigated as a promising non-precious catalyst for ORR because
of its abundance, low cost, environmental friendliness. Nevertheless, the practical applications of these materials are greatly
impeded by its lower energetic efficiencies which is primarily ascribed to their poor conductivity and relatively lower amount of
catalytically active sites. Moreover, MnOx catalysts are prone to aggregate in recycling use which may further decrease the ORR
catalytic activity and stability. Herein, a composite consisting of spherical MnO2 coated with reduced graphene oxide (MnO2@
RGO) has been prepared by step galvanostatic electrodeposition (Figure 1). Firstly, MnO2 is deposited on the electrode surface
by anodic galvanostatic method by the following process Mn2++ 2H
2
O―
>
MnOOH + e
-
+ 3H
+
―
>
MnO
2
+ 4H
+
+ 2e-. And then a three-
dimensional composite of reduced graphene oxide (RGO) coating MnO
2
is obtained through cathodic galvanostatic reduction
of GO to RGO. The formed core-shell structure not only prevent graphene sheets from damage caused by pressure of MnOx on
the surface of graphene which may thereby maximizing the catalyst conductivity extremely, but also reduce the agglomeration
of MnOx particles. In addition, owing to the larger specific surface area of graphene on the outer layer and its stronger electron-
donating ability than MnO
2
, the asprepared composite is easier to adsorb and activate O
2
. To the best of our knowledge, few
research reports have been involved on the galvanostatic preparation of MnO
2
-graphene core-shell composite and its application
for ORR hitherto.
shenlin@fjnu.edu.cnXiaofeng Zhang, Zhongshui Li and Shen Lin
Fujian Normal University, People’s Republic of China
J Org Inorg Chem 2018 Volume: 4
DOI: 10.21767/2472-1123-C6-018
A composite of MnO2 coated with graphene by
galvanostatic electrodeposition and its highly
active and stable catalysis for oxygen reduction
reaction