Sustainable Cellulose Nanofibers-Mediated Synthesis of Uniform Spinel Zn-Ferrites Nanocorals for High Performances in Supercapacitors

Spinel ferrites are versatile, low-cost, and abundant metal oxides with remarkable electronic and magnetic properties, which find several applications. Among them, they have been considered part of the next generation of electrochemical energy storage materials due to their variable oxidation states...

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Vydáno v:International journal of molecular sciences Ročník 24; číslo 11; s. 9169
Hlavní autoři: Teixeira, Lucas T., de Lima, Scarllet L. S., Rosado, Taissa F., Liu, Liying, Vitorino, Hector A., dos Santos, Clenilton C., Mendonça, Jhonatam P., Garcia, Marco A. S., Siqueira, Rogério N. C., da Silva, Anderson G. M.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Switzerland MDPI AG 24.05.2023
MDPI
Témata:
Adsorption
Aqueous solutions
Buildings and facilities
Capacitors
Cellulose
Climatic changes
Crystal structure
Crystals
Electrolytes
Energy storage
Morphology
Nanomaterials
Nanoparticles
Particle size
Production processes
Spinel group
Structure
Wind power
Zinc
Zinc compounds
Brazil
controlled nanomaterials
Zn-ferrites
nanocorals
supercapacitors
ISSN:1422-0067, 1661-6596, 1422-0067
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Shrnutí:Spinel ferrites are versatile, low-cost, and abundant metal oxides with remarkable electronic and magnetic properties, which find several applications. Among them, they have been considered part of the next generation of electrochemical energy storage materials due to their variable oxidation states, low environmental toxicity, and possible synthesis through simple green chemical processing. However, most traditional procedures lead to the formation of poorly controlled materials (in terms of size, shape, composition, and/or crystalline structure). Thus, we report herein a cellulose nanofibers-mediated green procedure to prepare controlled highly porous nanocorals comprised of spinel Zn-ferrites. Then, they presented remarkable applications as electrodes in supercapacitors, which were thoroughly and critically discussed. The spinel Zn-ferrites nanocorals supercapacitor showed a much higher maximum specific capacitance (2031.81 F g−1 at a current density of 1 A g−1) than Fe2O3 and ZnO counterparts prepared by a similar approach (189.74 and 24.39 F g−1 at a current density of 1 A g−1). Its cyclic stability was also scrutinized via galvanostatic charging/discharging and electrochemical impedance spectroscopy, indicating excellent long-term stability. In addition, we manufactured an asymmetric supercapacitor device, which offered a high energy density value of 18.1 Wh kg−1 at a power density of 2609.2 W kg−1 (at 1 A g−1 in 2.0 mol L−1 KOH electrolyte). Based on our findings, we believe that higher performances observed for spinel Zn-ferrites nanocorals could be explained by their unique crystal structure and electronic configuration based on crystal field stabilization energy, which provides an electrostatic repulsion between the d electrons and the p orbitals of the surrounding oxygen anions, creating a level of energy that determines their final supercapacitance then evidenced, which is a very interesting property that could be explored for the production of clean energy storage devices.
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ISSN:1422-0067
1661-6596
1422-0067
DOI:10.3390/ijms24119169