Study on the Service Life and Deactivation Mechanism
of Ti/SnO₂Sb Electrode by Physical and Electrochemical
Methods¹

Hai-Yang Ding^a,z, Yu-Jie Feng^b, and Jiang-Wei Lu^b

^aGrirem Advanced Materials Co. Ltd., General Research Institute for Non-Ferrous Metals, Beijing 100088, China

^bDepartment of Environmental Science and Engineering, Harbin Institute of Technology, Harbin 150090, China

Received January 12, 2009

Abstract—The Sb doped tin dioxide electrode (Sb-doped SnO₂) inter-layer was prepared using electroposition
layer-by-layer onto a titanium plate, and the Sb-doped SnO₂ surface catalytic layer (Ti/SnO₂–Sb) was prepared
using thermo-decomposition method. Accelerated service life tests were carried out in 0.5 M H₂SO₄ solution
and 1.0 M NaOH solution, respectively. The deactivation mechanism of the electrodes is studied using oxygen
evolution reaction (OER) as the reaction mode. Cyclic voltammetry test showed that the electrodes after accel-
erated life tests had no catalytic-oxidizing activity upon phenol. Electrochemical impedance spectroscopy (EIS)
analysis exhibited that the membrane resistance of the deactivated electrode increases obviously in 0.5 M
H₂SO₄ solution and 1.0 M NaOH solution, with the values of 1231 and 90.6 , respectively. The structure, mor-
phology and the content of the fresh and deactivated electrode were characterized using X-ray diffraction
(XRD), scanning electron microscopy (SEM) and energy dispersive X-ray detector (EDX). This suggested that
the Ti content on the electrode surface increases after deactivation, and TiO₂ membrane with poor conductivity
is grown on the electrode surface.

Key words: electrochemical impedance spectroscopy, service life, SnO₂ electrode

DOI: 10.1134/S1023193510010088

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