The change in the surface morphology in electrochemical processes can directly affect the stability of the electrode. Ti/Sb-SnO
2
the target electrode
was electrolyzed in the Na
2
SO
4
solution(0.1 mol·L
-1
)under constant current density condition(5×10
-3
A·cm
-2
)for 300 h. scanning electron microscope
energy dispersive spectrometer and X-ray diffraction(XRD)were used to determine the change in the surface morphology. Inductively coupled plasma optical emission spectrometry was used to determine the metal content in the electrolyte. Then the possible reason for the deactivat
ion of the Ti/Sb-SnO
2
electrode after long time running was proposed. The SEM results show that the surface layer of the Ti/Sb-SnO
2
electrode was partially dissolved and some parts were even detached from the titanium base after electrolysis. The Sn element was detected in the electrolyte after electrolysis
suggesting that Sb-SnO
2
was indeed dissolved in the electrolyte. The XRD analysis indicates that the surface layer was still Sb-SnO
2
but the diffraction peak intensity decreased. It appears that the anode deactivation may result from the dissolution and detachment of the oxide layer and the passivation of substrate. The result can be useful for the enhancement of the electrode stability.
关键词
Keywords
references
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