Donatien Ngendabanyikwa , Zhengyi Xu , Guozhe Meng , Yanqiu Wang , Junyi Wang , Yawei Shao
{"title":"研究了Ni-Sn镀层钝化膜的半导体特性和锡偏析机理","authors":"Donatien Ngendabanyikwa , Zhengyi Xu , Guozhe Meng , Yanqiu Wang , Junyi Wang , Yawei Shao","doi":"10.1016/j.jelechem.2023.117588","DOIUrl":null,"url":null,"abstract":"<div><p>The nanocrystalline Ni-Sn coatings (average grain size 15.78 nm) formed of relatively ordered circular particles covering the entire surface characterized with nodule-like endings were successfully electrodeposited using pulse electrodeposition technique. Scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM-EDS) and X-ray diffraction (XRD) were used to analyse the film microstructure. The corrosion resistance and semiconducting properties of Ni-Sn coatings were investigated in borate buffer solution. The EIS measurements showed that Ni-Sn alloys developed, in the passive zone, a good corrosion resistance as demonstrated by a thin film thickness, the low capacitance value, high polarization resistance, and the high value of electric field strength. Mott-Schottky analysis showed that the passive film formed on Ni-Sn coatings presents an p-n heterojunction characteristic indicating that the charge carrier densities are composed of cation (<em>N</em><sub>A</sub>) and anion (<em>N</em><sub>D</sub>) vacancies. The high density of point defects (<em>N</em><sub>A</sub> + <em>N</em><sub>D</sub> ∼ 10<sup>21</sup>cm<sup>−3</sup>) induces a high electronic conductivity in the Ni-Sn coatings passive film. The XPS analysis showed that the passive film formed on Ni-Sn alloys is composed of NiO, Ni(OH)<sub>2</sub>, NiOOH, SnO, and SnO<sub>2</sub> species and an enrichment of Sn in the passive film. The mechanisms of passive film growth and Sn segregation in the Ni-Sn passive film are suggested in conjunction with the Point Defect Model (PDM). The good corrosion resistance and high electronic conductivity achieved in this work suggest that Ni-Sn Coating is a good candidate for water electrolysis applications.</p></div>","PeriodicalId":50545,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"943 ","pages":"Article 117588"},"PeriodicalIF":4.5000,"publicationDate":"2023-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"The semiconductor properties and tin segregation mechanism in the passive film formed on the electrodeposited Ni-Sn coatings\",\"authors\":\"Donatien Ngendabanyikwa , Zhengyi Xu , Guozhe Meng , Yanqiu Wang , Junyi Wang , Yawei Shao\",\"doi\":\"10.1016/j.jelechem.2023.117588\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The nanocrystalline Ni-Sn coatings (average grain size 15.78 nm) formed of relatively ordered circular particles covering the entire surface characterized with nodule-like endings were successfully electrodeposited using pulse electrodeposition technique. Scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM-EDS) and X-ray diffraction (XRD) were used to analyse the film microstructure. The corrosion resistance and semiconducting properties of Ni-Sn coatings were investigated in borate buffer solution. The EIS measurements showed that Ni-Sn alloys developed, in the passive zone, a good corrosion resistance as demonstrated by a thin film thickness, the low capacitance value, high polarization resistance, and the high value of electric field strength. Mott-Schottky analysis showed that the passive film formed on Ni-Sn coatings presents an p-n heterojunction characteristic indicating that the charge carrier densities are composed of cation (<em>N</em><sub>A</sub>) and anion (<em>N</em><sub>D</sub>) vacancies. The high density of point defects (<em>N</em><sub>A</sub> + <em>N</em><sub>D</sub> ∼ 10<sup>21</sup>cm<sup>−3</sup>) induces a high electronic conductivity in the Ni-Sn coatings passive film. The XPS analysis showed that the passive film formed on Ni-Sn alloys is composed of NiO, Ni(OH)<sub>2</sub>, NiOOH, SnO, and SnO<sub>2</sub> species and an enrichment of Sn in the passive film. The mechanisms of passive film growth and Sn segregation in the Ni-Sn passive film are suggested in conjunction with the Point Defect Model (PDM). The good corrosion resistance and high electronic conductivity achieved in this work suggest that Ni-Sn Coating is a good candidate for water electrolysis applications.</p></div>\",\"PeriodicalId\":50545,\"journal\":{\"name\":\"Journal of Electroanalytical Chemistry\",\"volume\":\"943 \",\"pages\":\"Article 117588\"},\"PeriodicalIF\":4.5000,\"publicationDate\":\"2023-08-15\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Electroanalytical Chemistry\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1572665723004484\",\"RegionNum\":3,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"Chemical Engineering\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Electroanalytical Chemistry","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1572665723004484","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"Chemical Engineering","Score":null,"Total":0}
The semiconductor properties and tin segregation mechanism in the passive film formed on the electrodeposited Ni-Sn coatings
The nanocrystalline Ni-Sn coatings (average grain size 15.78 nm) formed of relatively ordered circular particles covering the entire surface characterized with nodule-like endings were successfully electrodeposited using pulse electrodeposition technique. Scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM-EDS) and X-ray diffraction (XRD) were used to analyse the film microstructure. The corrosion resistance and semiconducting properties of Ni-Sn coatings were investigated in borate buffer solution. The EIS measurements showed that Ni-Sn alloys developed, in the passive zone, a good corrosion resistance as demonstrated by a thin film thickness, the low capacitance value, high polarization resistance, and the high value of electric field strength. Mott-Schottky analysis showed that the passive film formed on Ni-Sn coatings presents an p-n heterojunction characteristic indicating that the charge carrier densities are composed of cation (NA) and anion (ND) vacancies. The high density of point defects (NA + ND ∼ 1021cm−3) induces a high electronic conductivity in the Ni-Sn coatings passive film. The XPS analysis showed that the passive film formed on Ni-Sn alloys is composed of NiO, Ni(OH)2, NiOOH, SnO, and SnO2 species and an enrichment of Sn in the passive film. The mechanisms of passive film growth and Sn segregation in the Ni-Sn passive film are suggested in conjunction with the Point Defect Model (PDM). The good corrosion resistance and high electronic conductivity achieved in this work suggest that Ni-Sn Coating is a good candidate for water electrolysis applications.
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The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied.
Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.
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