Electrochemical dissolution of gold in presence of chloride and bromide traces studied by on-line electrochemical inductively coupled plasma mass spectrometry

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• 作者：Olga Kasian^a ; ^{o.kasian@mpie.de} ; Nadiia Kulyk^a ; Andrea Mingers^a ; Aleksandar R. Zeradjanin^a ; ^b ; Karl J.J. Mayrhofer^a ; ^b ; ^c ; Serhiy Cherevko^a ; ^b ; ^{cherevko@mpie.de} ; ^{cherevko@gmail.com}
• 关键词：gold ; corrosion ; passivation ; oxidation ; halide ions
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：20 December 2016
• 年：2016
• 卷：222
• 期：Complete
• 页码：1056-1063
• 全文大小：1304 K
• 卷排序：222

文摘

Electrochemical dissolution of gold in the presence of halide ions is traditionally considered as a model case in metal corrosion and passivation studies. Due to a relatively low sensitivity of the conventional techniques, such studies were predominantly limited to electrolytes with high concentrations of halides. The current work employs a special electrochemical scanning flow cell with online inductively coupled plasma mass spectrometry (SFC-ICP-MS) that allows overcoming those limitations, enabling the quantification of gold dissolution in the presence of chloride and bromide traces (1 μM ≤ [Cl−/Br−] ≤ 100 μM). Moreover, time- and potential-resolved gold dissolution profiles under different potential programs are provided. Based on the experimental results, a tentative mechanism of gold dissolution based on the catalyzing role of hydroxyl and halide anions is discussed.