期刊
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
卷 782, 期 -, 页码 91-97出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2016.10.026
关键词
Tungsten/tungsten oxide electrode; Tungsten electrode; pH measurement; Corrosion monitoring
资金
- Science and Technology Foundation of China [51371174, 51671201]
- Institute of Metal Research, Chinese Academy of Sciences [SCJJ-2013-ZD-02]
Tungsten/tungsten oxide electrodes were prepared by four kinds of methods and their pH response behaviors in lithium borate buffer solutions at 25 degrees C have been investigated by electrochemical measurements. It was found that tungsten/tungsten oxide electrode made by immersion in HNO3 solution was unsuited to the testing environment because it tended to exfoliate or dissolve during tests. All the other tungsten/tungsten oxide electrodes showed linear response to pH values and good stability during the long-term potential monitoring. The lower dissolution rate of tungsten/tungsten oxide electrode made by heat-treatment made it the best candidate for the long-term monitoring due to its compact oxide film formed on the surface. X-ray photoelectron spectroscopy and thermodynamic analysis have been done to evaluate pH response mechanisms of the corresponding electrodes. (C) 2016 Elsevier B.V. All rights reserved.
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