Controlled synthesis of MnO2 nanoparticles for aqueous battery cathodes: polymorphism–capacity correlation
| العنوان: | Controlled synthesis of MnO2 nanoparticles for aqueous battery cathodes: polymorphism–capacity correlation |
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| المؤلفون: | Elahe Moazzen, Elena V. Timofeeva, Carlo U. Segre |
| المصدر: | Journal of Materials Science. 52:8107-8118 |
| بيانات النشر: | Springer Science and Business Media LLC, 2017. |
| سنة النشر: | 2017 |
| مصطلحات موضوعية: | Materials science, Aqueous solution, Rietveld refinement, Mechanical Engineering, Nanoparticle, Nanotechnology, 02 engineering and technology, Electrolyte, Crystal structure, 010402 general chemistry, 021001 nanoscience & nanotechnology, Electrochemistry, 01 natural sciences, 0104 chemical sciences, Chemical engineering, Polymorphism (materials science), Mechanics of Materials, General Materials Science, 0210 nano-technology, Powder diffraction |
| الوصف: | Polymorphs of MnO2 are known to have different electrochemical activity, with gamma (γ) and akhtenskite (e) polymorphs often considered as the most active phases for aqueous battery cathodes. However, most synthetic samples contain a mixture of polymorph phases, which makes understanding of the structure-property correlations more complicated. In this paper, we report on a systematic study that correlates synthesis parameters with the morphology, phase composition and reversible storage capacity of the resulting nanoparticles. Rietveld analysis of X-ray powder diffraction patterns was used to accurately describe fractional composition of multi-phase nanoparticles. It was demonstrated that through control of the synthesis parameters desired phase compositions and nanoparticle morphologies can be achieved. The key synthesis parameters were found to be the concentration of Mn2+ precursor which strongly affects both the morphology and the crystalline structure of the products, and the time of reaction. The presence of surfactant only impacts the crystalline phase composition of the MnO2 nanoparticles and has insignificant effect on the morphology. It was also demonstrated that nanoparticles with higher fraction of the akhtenskite polymorph show higher reversible capacities in LiOH electrolyte (~210 mAh/g) compared to other MnO2 phase compositions (~120 mAh/g). |
| تدمد: | 1573-4803 0022-2461 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::3a4d7b74785d109c7039ce06be3028b4 https://doi.org/10.1007/s10853-017-1018-5 |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi...........3a4d7b74785d109c7039ce06be3028b4 |
| قاعدة البيانات: | OpenAIRE |
Find this article in full text from Springer Verlag. | تدمد: | 15734803 00222461 |
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