Electrochemical dissolution of gold in acidic medium |
| |
| Affiliation: | 1. Department of Chemistry, Faculty of Science, Kochi University, Akebono-cho, Kochi 780-8520, Japan;2. Department of Marine Resource Science, Faculty of Agriculture and Marine Science, Kochi University, B200 Monobe, Nankoku, Kochi 783-8502, Japan;1. Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich, 91058 Erlangen, Germany;2. Department of Chemical and Biological Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany;3. Nanoanalytics and Interfaces Group, Max-Planck-Institut für Eisenforschung GmbH, 40237 Düsseldorf, Germany;4. Department of Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, 40237 Düsseldorf, Germany |
| |
| Abstract: | Polycrystalline gold dissolves at high potentials in acidic medium even without the presence of complexing agents. In the present work the dissolution of gold is quantitatively studied by an inductively coupled plasma mass spectrometer (ICP-MS) directly connected to an electrochemical scanning flow cell (SFC). It is shown that the onset of gold dissolution coincides with the onset of the formation of 2D surface oxide (ca. + 1.3 VRHE). An increase in the upper potential limit (UPL) during potential cycling or an increase in the holding potential during potential steps leads to an enhancement in the amount of dissolved gold. Moreover, a change in the dominating mechanism for gold dissolution with increasing potential is found in transient experiments. At lower potentials, gold is dissolved mostly during the gold oxide reduction, while at higher potentials anodic dissolution is the dominating process. Finally, the possible application of gold for stabilization of PtAu-based fuel cell catalysts is discussed. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
