Electrocatalytic Activity of Sol–Gel-Prepared RuO 2 /Ti Anode in Chlorine and Oxygen Evolution Reactions
Authorized Users Only
2006
Authors
Panić, Vladimir
Dekanski, Aleksandar

Milonjić, Slobodan K.

Mišković-Stanković, Vesna

Nikolić, B. Ž.
Article (Published version)

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Show full item recordAbstract
Electrocatalytic properties of
RuO
2
/Ti
anode with different coating masses, which are prepared by
the alkoxide sol–gel procedure, are investigated in chlorine and oxygen evolution reactions by polarization
measurements and electrochemical impedance spectroscopy in
H
2
SO
4
and NaCl electrolytes. According to
polarization measurements, the activity of anodes at overpotentials below 100 mV is independent of coating
mass. However, impedance measurements above 100 mV reveal changes in the activity of anodes in chlorine
evolution reaction for different coating masses. The diffusion limitations related to the evolved chlorine are registered
in low-frequency domain at 1.10 V (SCE), diminishing with the increase in potential to the 1.15 V
(SCE). The observed impedance behavior is discussed with respect to the activity model for activated titanium
anodes in chlorine evolution reaction involving formation of gas channels within porous coating structure. Gas
channels enhance t...he mass transfer rate similarly to the forced convection, which also increases the activity of
anode. This is more pronounced for the anode of greater coating mass due to its more compact surface structure.
The more compact structure appears to be beneficial for gas channels formation.
Keywords:
electrocatalysis / RuO 2 /Ti anode / chlorine evolution / oxygen evolution / sol–gel methodSource:
Russian Journal of Electrochemistry, 2006, 42, 10, 1055-1060Publisher:
- Springer
Projects:
- Elektrohemijske karakteristike oksidnih i polimernih prevlaka na modifikovanim površinama metala (RS-142061)
DOI: 10.1134/S1023193506100107
ISSN: 1023-1935; 1608-3342