Synthesis and electrochemistry study for La-doped RuO2-TiO2/Ti coatings

Author:

Jiang Xiaoyu1,Li Shuai1,Zhang Zhigang1,Xiao Hang1,Wu Weiqing1,Lin Lang1,Wu Xiaoyuan2,Li Wei3,Zhang Lei3,Chen Wenzhe3

Affiliation:

1. Fujian University of Technology, College of Ecological Environment and Urban Construction, Fuzhou, P.R. China

2. Chinese Academy of Sciences, Fujian Institute of Research on the Structure of Matter, State Key Laboratory of Structural Chemistry, Fuzhou, Fujian, P.R. China

3. Fujian University of Technology, College of Science and Engineering, Fuzhou, P.R. China

Abstract

La-doped RuO2?TiO2/Ti coating (TRL) and RuO2?TiO2/Ti coating (TR) were prepared by the sol?gel method and thermal treatment. The products were characterized by X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM). The electrochemical properties were investigated by cyclic voltammetry and polarization measurements in O2 and Cl2 evolution in H2SO4 and NaCl solution. The XRD analysis showed that in both TRL and TR, the particles of the synthesized coatings were of low crystallinity, and that they were mainly formed of two phases, rutile TiO2 and RuO2. SEM confirmed that the surface of TRL and TR coatings had a cracked mud appearance consisting of blocks separated by cracks. The morphology of the TRL coating shows irregular crack blocks, which increased the specific area greatly and provides more active sites. Polarization measurements indicate that the onset potential of chlorine evolution reaction for TRL coating was 1.08 VSCE, which is lower than the value of 1.12 VSCE registered for the TR coating. The onset potentials for oxygen evolution for the two coatings were similar. Cyclic voltammetry shows an improvement of the electrochemical capacity for the La-doped coatings.

Publisher

National Library of Serbia

Subject

General Chemistry

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