Effect of Germanium Incorporation on the Electrochemical Performance of Electrospun Fe2O3 Nanofibers-Based Anodes in Sodium-Ion Batteries
| Autor: | Gabriele Brugnetti, Beatrix Petrovičová, Riccardo Ruffo, Claudia Triolo, Lorenzo Spadaro, Chiara Ferrara, Martina Fracchia, Simone Pollastri, Paolo Ghigna, Saveria Santangelo, Clemens Ritter |
|---|---|
| Přispěvatelé: | Petrovičovà, B, Ferrara, C, Brugnetti, G, Ritter, C, Fracchia, M, Ghigna, P, Pollastri, S, Triolo, C, Spadaro, L, Ruffo, R, Santangelo, S |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
electrospun fibres
Xas XAS Sodium-ion batterie 02 engineering and technology 01 natural sciences lcsh:Technology Neutron diffraction lcsh:Chemistry chemistry.chemical_compound Xa General Materials Science Sodium-ion batteries Instrumentation lcsh:QH301-705.5 Iron (III) oxide Fluid Flow and Transfer Processes Electrospun fibre iron (III) oxides General Engineering Electrospun fibres EXAFS Germanium incorporation Iron (III) oxides Raman spectroscopy 021001 nanoscience & nanotechnology Electrospinning lcsh:QC1-999 Computer Science Applications visual_art visual_art.visual_art_medium sodium-ion batteries 0210 nano-technology Materials science Nanostructure Oxide chemistry.chemical_element Germanium 010402 general chemistry Dopant lcsh:T Process Chemistry and Technology Hematite 0104 chemical sciences Amorphous solid chemistry Chemical engineering lcsh:Biology (General) lcsh:QD1-999 lcsh:TA1-2040 Nanofiber lcsh:Engineering (General). Civil engineering (General) lcsh:Physics |
| Zdroj: | Applied Sciences Volume 11 Issue 4 Applied Sciences, Vol 11, Iss 1483, p 1483 (2021) 'Applied Sciences ', vol: 11, pages: 1483-1-1483-15 (2021) |
| Popis: | Fe2O3 and Fe2O3:Ge nanofibers (NFs) were prepared via electrospinning and thoroughly characterized via several techniques in order to investigate the effects produced by germanium incorporation in the nanostructure and crystalline phase of the oxide. The results indicate that reference Fe2O3 NFs consist of interconnected hematite grains, whereas in Fe2O3:Ge NFs, constituted by finer and elongated nanostructures developing mainly along their axis, an amorphous component coexists with the dominant α-Fe2O3 and γ-Fe2O3 phases. Ge4+ ions, mostly dispersed as dopant impurities, are accommodated in the tetrahedral sites of the maghemite lattice and probably in the defective hematite surface sites. When tested as anode active material for sodium ion batteries, Fe2O3:Ge NFs show good specific capacity (320 mAh g−1 at 50 mA g−1) and excellent rate capability (still delivering 140 mAh g−1 at 2 A g−1). This behavior derives from the synergistic combination of the nanostructured morphology, the electronic transport properties of the complex material, and the pseudo-capacitive nature of the charge storage mechanism. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|