Electrochemical characterization and oxygen reduction kinetics of Cu-incorporated cobalt oxide catalyst
Abstract
Electrochem
ical characterization of Cu incorporated cobalt oxide is carried out and
oxygen reduction
reaction
(ORR) activity also determined at different catalyst loadings (CLs), using thin film
rotating
disk electrode (RDE)
technology. E
lectrochemical properties such as the electrochemical surface area
(ECSA), ORR, mass activity specific activity, as well as the durability of the electrocatalyst is
evaluated.
ESCA is determined by cyclic voltammetry (CV) measurements in
1 M KOH
at 30
C,
using scanning rates of 5
–
100 mV s
–
1
. The active CO
3
+
present in the surface of the
(CuCoO)
x
lattice
acts as a donor
–
acceptor in the reduction sites during the ORR.
The o
xygen reduction activity for
(CuCoO)
x
catalysts is evaluated at various rotation rate
in the range 400
–
3000 rpm.
The data are
analysed using the Koutecky
–
Levich relationship;
parallel lines indicate first
-
order kinetics.
The
number of electrons
transfer
favours
a 4e
-
pathway
oxygen reduction process
, the rate constant of the
reaction is in
the range 0.07
–
0.11 mol L
–
1
s
–
1
at CL 0.05 mg cm
–
2
URI
http://hdl.handle.net/10394/21439http://dx.doi.org/10.20964/2016.09.12
http://www.electrochemsci.org/papers/vol11/110908002.pdf
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