TY - JOUR
T1 - Electrochemical behavior of novel Ti/IrOx-Sb2O5-SnO2 anodes
AU - Chen, Guohua
AU - Chen, Xueming
AU - Yue, Po Lock
N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].
PY - 2002/5/2
Y1 - 2002/5/2
N2 - There are growing interests in anodes for oxygen evolution because of the importance of this reaction in many electrochemical processes such as water electrolysis, electroplating, electrosynthesis, metal electrowinning, and electroflotation. Ternary IrOx-Sb2O5-SnO2 has been shown to be among the best elecytrocatalysts for oxygen evolution. Its high stability and relatively low cost will make it more attractive than IrOx and many other electrocatalytic materials. In this paper, the open-circuit potential, voltammetric behavior, oxygen evolution mechanism, and kinetics of the IrOx-Sb2O5-SnO2 coated titanium anodes were studied. It was found that the open-circuit potential could change significantly during the initial period of time probably because of the hydration of the coating film. Cyclic voltammograms obtained on Ti/IrOx-Sb2O5-SnO2 were somewhat different from those on IrOx coated anodes. Apparent cathodic peaks from Ir(III)/Ir(IV) and Ir(IV)/Ir(V) were observed. However, the corresponding anodic peaks were very weak. Voltammetric investigation also showed that Ti/IrOx-Sb2O5-SnO2 could provide fast electron transfer. Despite high anodic stability, severe damage occurred when a Ti/IrOx-Sb2O5-SnO2 electrode was cathodically polarized. An O2 evolution mechanism involving cyclic formation and decomposition of ≡IrO2 was proposed. The Tafel slope and ∂E/∂log aH+ obtained were 86 and 45 mV dec-1, respectively.
AB - There are growing interests in anodes for oxygen evolution because of the importance of this reaction in many electrochemical processes such as water electrolysis, electroplating, electrosynthesis, metal electrowinning, and electroflotation. Ternary IrOx-Sb2O5-SnO2 has been shown to be among the best elecytrocatalysts for oxygen evolution. Its high stability and relatively low cost will make it more attractive than IrOx and many other electrocatalytic materials. In this paper, the open-circuit potential, voltammetric behavior, oxygen evolution mechanism, and kinetics of the IrOx-Sb2O5-SnO2 coated titanium anodes were studied. It was found that the open-circuit potential could change significantly during the initial period of time probably because of the hydration of the coating film. Cyclic voltammograms obtained on Ti/IrOx-Sb2O5-SnO2 were somewhat different from those on IrOx coated anodes. Apparent cathodic peaks from Ir(III)/Ir(IV) and Ir(IV)/Ir(V) were observed. However, the corresponding anodic peaks were very weak. Voltammetric investigation also showed that Ti/IrOx-Sb2O5-SnO2 could provide fast electron transfer. Despite high anodic stability, severe damage occurred when a Ti/IrOx-Sb2O5-SnO2 electrode was cathodically polarized. An O2 evolution mechanism involving cyclic formation and decomposition of ≡IrO2 was proposed. The Tafel slope and ∂E/∂log aH+ obtained were 86 and 45 mV dec-1, respectively.
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U2 - 10.1021/jp013547o
DO - 10.1021/jp013547o
M3 - RGC 21 - Publication in refereed journal
SN - 1520-6106
VL - 106
SP - 4364
EP - 4369
JO - The Journal of Physical Chemistry B
JF - The Journal of Physical Chemistry B
IS - 17
ER -