期刊
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
卷 880, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2020.114837
关键词
Magnesium; Anodic dissolution; Univalent magnesium cation; Negative difference effect; Carbon fiber ultramicroelectrode; Scanning electrochemical microscopy
资金
- National Key Research and Development Program of China [2017YFB0702302]
- National Natural Science Foundation of China [51771174, 52071347]
- National Materials Corrosion and Protection Data Center
The study provides direct evidence of the presence of Mg+ in aqueous solution under open circuit and polarization conditions, which helps to understand the negative difference effect (NDE). This was achieved using a modified substrate generation/tip collection mode of scanning electrochemical microscopy to detect Mg+ via its reaction with potassium ferricyanide (K3[Fe(CN)6]).
Although the existence of short-lived univalent magnesium cation (Mg+) was supposed to play an important role on negative difference effect (NDE) during anodic dissolution of magnesium in previous work, no direct proof of the existence of Mg+ has ever been reported. Here, a modified substrate generation/tip collection mode of scanning electrochemical microscopy was applied to detect Mg+ via the reaction of generated Mg+ and potassium ferricyanide (K3[Fe(CN)6]). Based on the new design method and experimental data, our studies provide a direct evidence of the presence of Mg+ in aqueous solution combining with open circuit and polarization condition, which is benefit to understand NDE.
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