Characterization of electroless Ni-Mo-P/SnO2/Ti electrodes for oxygen evolution in alkaline solution |
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Authors: | Y L Lo S C Chou B J Hwang |
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Affiliation: | (1) Department of Chemical Engineering, National Taiwan Institute of Technology, 10672 Taipei, Taiwan, Republic of China |
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Abstract: | Ni-Mo-P alloy electrodes, prepared by electroless plating, were characterized for application to oxygen evolution. The rate constants were estimated for oxygen evolution on electrodes prepared at various Mo-complex concentrations. The surface area and the crystallinity increase with increasing Mo content. The electrochemical characteristics of the electrodes were identified in relation to morphology and the structure of the surface. The results show that the electroless Ni-Mo-P electrode prepared at a Mo-complex concentration of 0.011 m provided the best electrocatalytic activity for oxygen evolution.List of symbols
b
Tafel slope (mV dec–1)
-
b
F/RT (mV–1)
-
F
Faraday constant (96 500 C mol–1)
-
j
current density (mA cm–2)
-
k 1
reaction rate of Reaction 1, (mol–1 cm3 s–)
-
k
1
= k 1 C
OH
–(mol cm–2 s–1)
-
k
10
rate constant of Reaction 1 at = 0 (mol cm–2 s–1)
-
k c1
rate constant of Reaction 2 (mol–1 cm3 s–1)
-
k
c1
= k c1 C
H
2O (mol cm–2 s–1)
-
k c2
rate constant of chemical Reaction 3 (mol–1 cm2 s–1)
-
k
c2
= k c2 2 (mol cm–2 s–1)
-
k c3
rate constant of Reaction 4 (mol–1 cm2 s–1)
-
Q
a
anodic capacity (mC)
-
Q
c
cathodic capacity (mC)
-
R
gas constant (8.314 J mol–1 K–1)
-
R
ct
charge transfer resistance ( cm2)
-
R
ads
charge transfer resistance due to adsorption effect ( cm2)
-
C
d1
double layer capacity (mF cm–2)
-
C
ads
double layer capacity due to adsorption effect (mF cm–2)
-
T
temperature (K)
Greek symbols
anodic transfer coefficient
- O
2
oxygen overpotential (mV)
-
saturation concentration of surface oxide on nickel (mol cm–2) |
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Keywords: | |
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