Electrochemical and Phase Analysis of Si(IV) on Fe Electrode in Molten NaCl-NaF-KCl-SiO2 System
The electrochemical behaviour of Si(IV) ions on Fe electrode in the NaCl-NaF-KCl-SiO2 molten salt system (0.177 mol·L−1 SiO2) at 1,103 K was studied by using cyclic voltammetry, square wave voltammetry, chronoamperometry, and chronopotentiometry．Experiments conducted using the first two methods indi...
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| Format: | Article |
| Language: | English |
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De Gruyter
2018-10-01
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| Series: | High Temperature Materials and Processes |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/htmp-2017-0113 |
| _version_ | 1819128092888662016 |
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| author | Li Hui Liang Jinglong Xie Shanshan Reddy Ramana G. Wang Lanqing |
| author_facet | Li Hui Liang Jinglong Xie Shanshan Reddy Ramana G. Wang Lanqing |
| author_sort | Li Hui |
| collection | DOAJ |
| description | The electrochemical behaviour of Si(IV) ions on Fe electrode in the NaCl-NaF-KCl-SiO2 molten salt system (0.177 mol·L−1 SiO2) at 1,103 K was studied by using cyclic voltammetry, square wave voltammetry, chronoamperometry, and chronopotentiometry．Experiments conducted using the first two methods indicated that the reduction of Si(IV) occurred in two steps: Si(IV) → Si(II) → Si(0). Furthermore, the electrochemical reaction is a quasi-reversible process, which is controlled by both the ion diffusion and electron transport rates. The electrochemical crystallization of Si was found to be a transient, the three-dimensional nucleation process. The cyclic voltammetry curves indicate that the diffusion coefficient of Si(IV) is 1.16×10–5 cm2·s−1. The phases formed on the surface of the deposit were analysed by scanning electron microscopy and X-ray diffractometer. The results show that Fe and Si have formed intermetallic compounds Fe3Si, FeSi, and Fe5Si3. |
| first_indexed | 2024-12-22T08:22:20Z |
| format | Article |
| id | doaj.art-c52d87817cca43e79000b0c0a70f08bd |
| institution | Directory Open Access Journal |
| issn | 0334-6455 2191-0324 |
| language | English |
| last_indexed | 2024-12-22T08:22:20Z |
| publishDate | 2018-10-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | High Temperature Materials and Processes |
| spelling | doaj.art-c52d87817cca43e79000b0c0a70f08bd2022-12-21T18:32:43ZengDe GruyterHigh Temperature Materials and Processes0334-64552191-03242018-10-01379-1092192810.1515/htmp-2017-0113Electrochemical and Phase Analysis of Si(IV) on Fe Electrode in Molten NaCl-NaF-KCl-SiO2 SystemLi Hui0Liang Jinglong1Xie Shanshan2Reddy Ramana G.3Wang Lanqing4Key Laboratory of Ministry of Education for Modern Metallurgy Technology, College of Metallurgy and Energy, North China University of Science and Technology, Tangshan063210, ChinaKey Laboratory of Ministry of Education for Modern Metallurgy Technology, College of Metallurgy and Energy, North China University of Science and Technology, Tangshan063210, ChinaKey Laboratory of Ministry of Education for Modern Metallurgy Technology, College of Metallurgy and Energy, North China University of Science and Technology, Tangshan063210, ChinaDepartment of Metallurgical and Materials Engineering, The University of Alabama, Tuscaloosa, AL35487, USAKey Laboratory of Ministry of Education for Modern Metallurgy Technology, College of Metallurgy and Energy, North China University of Science and Technology, Tangshan063210, ChinaThe electrochemical behaviour of Si(IV) ions on Fe electrode in the NaCl-NaF-KCl-SiO2 molten salt system (0.177 mol·L−1 SiO2) at 1,103 K was studied by using cyclic voltammetry, square wave voltammetry, chronoamperometry, and chronopotentiometry．Experiments conducted using the first two methods indicated that the reduction of Si(IV) occurred in two steps: Si(IV) → Si(II) → Si(0). Furthermore, the electrochemical reaction is a quasi-reversible process, which is controlled by both the ion diffusion and electron transport rates. The electrochemical crystallization of Si was found to be a transient, the three-dimensional nucleation process. The cyclic voltammetry curves indicate that the diffusion coefficient of Si(IV) is 1.16×10–5 cm2·s−1. The phases formed on the surface of the deposit were analysed by scanning electron microscopy and X-ray diffractometer. The results show that Fe and Si have formed intermetallic compounds Fe3Si, FeSi, and Fe5Si3.https://doi.org/10.1515/htmp-2017-0113cyclic voltammetrysquare wave voltammetrychronoamperometrychronopotentiometrycompound systems |
| spellingShingle | Li Hui Liang Jinglong Xie Shanshan Reddy Ramana G. Wang Lanqing Electrochemical and Phase Analysis of Si(IV) on Fe Electrode in Molten NaCl-NaF-KCl-SiO2 System High Temperature Materials and Processes cyclic voltammetry square wave voltammetry chronoamperometry chronopotentiometry compound systems |
| title | Electrochemical and Phase Analysis of Si(IV) on Fe Electrode in Molten NaCl-NaF-KCl-SiO2 System |
| title_full | Electrochemical and Phase Analysis of Si(IV) on Fe Electrode in Molten NaCl-NaF-KCl-SiO2 System |
| title_fullStr | Electrochemical and Phase Analysis of Si(IV) on Fe Electrode in Molten NaCl-NaF-KCl-SiO2 System |
| title_full_unstemmed | Electrochemical and Phase Analysis of Si(IV) on Fe Electrode in Molten NaCl-NaF-KCl-SiO2 System |
| title_short | Electrochemical and Phase Analysis of Si(IV) on Fe Electrode in Molten NaCl-NaF-KCl-SiO2 System |
| title_sort | electrochemical and phase analysis of si iv on fe electrode in molten nacl naf kcl sio2 system |
| topic | cyclic voltammetry square wave voltammetry chronoamperometry chronopotentiometry compound systems |
| url | https://doi.org/10.1515/htmp-2017-0113 |
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