Development of a Liquid-Phase Ion Gun and Its Application for Sulfidation of Silver Surface
Development of a Liquid-Phase Ion Gun and Its Application for Sulfidation of Silver Surface
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DOI：
10.1149/2.0071504jes
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发表时间：
2015
影响因子：
3.9
通讯作者：
Jun Seob Lee;K. Fushimi;Y. Kitagawa;T. Nakanishi;Y. Hasegawa
中科院分区：
文献类型：
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作者：
Jun Seob Lee;K. Fushimi;Y. Kitagawa;T. Nakanishi;Y. Hasegawa
为了研究金属银表面的硫化，利用微电极技术建立了一个安全的硫离子产生系统。银微电极硫化和微电极上的银硫化物还原在Na 2S溶液中是可逆的，分别对应于Ag 2S的形成和HS−的产生。覆盖在银微电极上的Ag 2S在pH 8.4的硼-硼酸盐缓冲溶液中的阴极极化成功地在玻璃或银基底上产生了HS-。HS-在基板附近的浓度取决于微电极和基板之间的距离。银基底被微电极产生的HS-局部硫化。然而，在电位高于0.14 VRHE，局部硫化的银基板是独立的基板电位。据认为，HS-的质量传输是占主导地位的硫化的银基板。8
A system for safe generation of sulfide ions was established by using the microelectrode technique in order to investigate sulfidation of the metal surface of silver. Both silver microelectrode sulfidation and silver sulfide reduction on the microelectrode were reversible in Na2S solution and corresponded to Ag2S formation and HS− generation, respectively. Cathodic polarization of Ag2S, which covered the silver microelectrode, in pH 8.4 boric-borate buffer solution successfully generated HS− above a glass or silver substrate. Concentration of HS− in the vicinity of the substrate was dependent on the distance between the microelectrode and the substrate. The silver substrate was locally sulfidated by HS− generated from the microelectrode. However, at potentials higher than 0.14 VRHE, local sulfidation of the silver substrate was independent of the substrate potential. It is thought that mass transport of HS− is dominant for sulfidation of the silver substrate. 8