Cathodic process of nickel electrodeposition from ammonia–ammonium chloride solutions
| العنوان: | Cathodic process of nickel electrodeposition from ammonia–ammonium chloride solutions |
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| المؤلفون: | Zhi-Ying Ding, Ya-Ning He, Shijun Liu, Liang Yuan |
| المصدر: | Rare Metals. 42:1061-1066 |
| بيانات النشر: | Springer Science and Business Media LLC, 2017. |
| سنة النشر: | 2017 |
| مصطلحات موضوعية: | inorganic chemicals, Materials science, Inorganic chemistry, chemistry.chemical_element, 02 engineering and technology, Electrolyte, 010402 general chemistry, 01 natural sciences, Chloride, Redox, Ammonia, chemistry.chemical_compound, parasitic diseases, Materials Chemistry, medicine, Physical and Theoretical Chemistry, Tafel equation, Reaction step, Metals and Alloys, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 0104 chemical sciences, Nickel, chemistry, Linear sweep voltammetry, 0210 nano-technology, medicine.drug |
| الوصف: | Mechanism of cathodic process on nickel electrodeposition from ammonia–ammonium chloride solutions was studied by Tafel polarization curves, linear sweep voltammetry (LSV), cyclic voltammograms (CV) and chronopotentiometry (CE) technologies. In the electrolyte with 1.0 mol·L−1 NiCl2·6H2O, 4.0 mol·L−1 NH3·H2O and 2.5 mol·L−1 NH4Cl, nickel ion mainly complexed with ammonia and almost no free nickel ion could be found. It is confirmed that the dominant form of nickel ammonia complex ion in the system is Ni(NH3) 4 2+ by measuring the equilibrium potential of the electrode at various concentrations of ammonia. The species of Ni(NH3) 4 2+ turns into Ni(NH3) 2 2+ during pre-chemical reaction step before discharging reduction reaction. Then, Ni(NH3) 2 2+ discharges at the cathodic interface to form metal nickel deposit directly. Nucleation process is involved during nickel electrodeposition according to CV results. The reduction reaction of Ni(NH3) 2 2+ is irreversible which is controlled by diffusion step. Other processes are also accompanied during the electrodeposition process, except for the diffusion-controlled process. |
| تدمد: | 1867-7185 1001-0521 |
| DOI: | 10.1007/s12598-017-0975-9 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::dbb4538d194275cfb4c5394007a7f1c3 https://doi.org/10.1007/s12598-017-0975-9 |
| Rights: | CLOSED |
| رقم الانضمام: | edsair.doi...........dbb4538d194275cfb4c5394007a7f1c3 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 18677185 10010521 |
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| DOI: | 10.1007/s12598-017-0975-9 |