Migration: A Neglected Potential Contribution of HCl-Oxidized Au(0)
In this study, the typical oxidation process of Au/C catalysts exposed to HCl is presented. Although the process violates the standard electrode potentials, the “oxidized” tendency of Au(0) species is analyzed. This oxidation behavior can only be triggered over the Au/C sample within residual cation...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-02-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/28/4/1600 |
| _version_ | 1797619104096452608 |
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| author | Zilong Zhang Haifeng Zhang Bolin Wang Yuxue Yue Jia Zhao |
| author_facet | Zilong Zhang Haifeng Zhang Bolin Wang Yuxue Yue Jia Zhao |
| author_sort | Zilong Zhang |
| collection | DOAJ |
| description | In this study, the typical oxidation process of Au/C catalysts exposed to HCl is presented. Although the process violates the standard electrode potentials, the “oxidized” tendency of Au(0) species is analyzed. This oxidation behavior can only be triggered over the Au/C sample within residual cationic Au species, and terminated over the completely metallic Au(0)/C sample. This study demonstrates that the presence of surface chlorination species cannot facilitate the oxidation of Au(0) and Au(I) when the sample is treated with HCl alone, which excludes the oxidation paths of: Au(0) → Au(III) and Au(I) → Au(III). The reported “HCl-oxidized Au(0)” behavior is partially caused by the migration of Au(III) species in the carbon bulk-phase, which occurs outside the XPS detection limit region and into the detection limit rather than the “HCl-oxidized Au(0)” itself. The mechanism of driving the bulk-phase Au(III) migrated from the steady destabilized state to the carbon surface is then studied. This study demonstrates that the migration of Au cannot be neglected behind the curious oxidation phenomenon by HCl, which provides a new perspective for the oxidation of other noble metals by HCl. |
| first_indexed | 2024-03-11T08:22:23Z |
| format | Article |
| id | doaj.art-8f4f6200bbb5483c9fdfa0eccf0c9aed |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-11T08:22:23Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-8f4f6200bbb5483c9fdfa0eccf0c9aed2023-11-16T22:20:43ZengMDPI AGMolecules1420-30492023-02-01284160010.3390/molecules28041600Migration: A Neglected Potential Contribution of HCl-Oxidized Au(0)Zilong Zhang0Haifeng Zhang1Bolin Wang2Yuxue Yue3Jia Zhao4School of Chemical Engineering, Northeast Electric Power University, Jilin 132012, ChinaSchool of Chemical Engineering, Northeast Electric Power University, Jilin 132012, ChinaSchool of Chemical Engineering, Northeast Electric Power University, Jilin 132012, ChinaIndustrial Catalysis Institute, Zhejiang University of Technology, Hangzhou 310014, ChinaIndustrial Catalysis Institute, Zhejiang University of Technology, Hangzhou 310014, ChinaIn this study, the typical oxidation process of Au/C catalysts exposed to HCl is presented. Although the process violates the standard electrode potentials, the “oxidized” tendency of Au(0) species is analyzed. This oxidation behavior can only be triggered over the Au/C sample within residual cationic Au species, and terminated over the completely metallic Au(0)/C sample. This study demonstrates that the presence of surface chlorination species cannot facilitate the oxidation of Au(0) and Au(I) when the sample is treated with HCl alone, which excludes the oxidation paths of: Au(0) → Au(III) and Au(I) → Au(III). The reported “HCl-oxidized Au(0)” behavior is partially caused by the migration of Au(III) species in the carbon bulk-phase, which occurs outside the XPS detection limit region and into the detection limit rather than the “HCl-oxidized Au(0)” itself. The mechanism of driving the bulk-phase Au(III) migrated from the steady destabilized state to the carbon surface is then studied. This study demonstrates that the migration of Au cannot be neglected behind the curious oxidation phenomenon by HCl, which provides a new perspective for the oxidation of other noble metals by HCl.https://www.mdpi.com/1420-3049/28/4/1600Au/Chydrogen chloridestandard electrode potentialsHCl-oxidized AuXPS detection |
| spellingShingle | Zilong Zhang Haifeng Zhang Bolin Wang Yuxue Yue Jia Zhao Migration: A Neglected Potential Contribution of HCl-Oxidized Au(0) Molecules Au/C hydrogen chloride standard electrode potentials HCl-oxidized Au XPS detection |
| title | Migration: A Neglected Potential Contribution of HCl-Oxidized Au(0) |
| title_full | Migration: A Neglected Potential Contribution of HCl-Oxidized Au(0) |
| title_fullStr | Migration: A Neglected Potential Contribution of HCl-Oxidized Au(0) |
| title_full_unstemmed | Migration: A Neglected Potential Contribution of HCl-Oxidized Au(0) |
| title_short | Migration: A Neglected Potential Contribution of HCl-Oxidized Au(0) |
| title_sort | migration a neglected potential contribution of hcl oxidized au 0 |
| topic | Au/C hydrogen chloride standard electrode potentials HCl-oxidized Au XPS detection |
| url | https://www.mdpi.com/1420-3049/28/4/1600 |
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