Fabrication of cobalt ferrite nanostructures and comparison of their electrochemical properties

Abstract

Cobalt Ferrite (CoFe 2 O 4 ) nanorods and nanorings have been successfully controllable synthesized by solvothermal method. The specific characteristics were confirmed by X-ray diffraction studies (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). The measurement of their electrochemical properties as supercapacitor electrode materials indicate different morphological characterizations have various capacitive effects, and CoFe 2 O 4 nanorings generally have larger specific capacitances than nanorods at different scan rates and current densities in 1.0 M KOH solution.

Mixed Transition‐Metal Oxides: Design, Synthesis, and Energy‐Related Applications

“…As shown in Figure 9 a-d, the electrospun polycrystalline ZnFe 2 O 4 NFs composed of 11 nm nanocrystal building blocks are self-assembled into intertwined porous nanowebs with a continuous framework. Furthermore, the rate capability examined by galvanostatic cycling at various current densities for 55 cycles (Figure 9 e) [21] and MnFe 2 O 4 , [115][116][117] are also investigated as pseudocapacitive materials for high-performance ECs. Furthermore, the rate capability examined by galvanostatic cycling at various current densities for 55 cycles (Figure 9 e) [21] and MnFe 2 O 4 , [115][116][117] are also investigated as pseudocapacitive materials for high-performance ECs.…”

“…These MTMOs are emerging as promising electrode materials for both LIBs and ECs. [14,[19][20][21][22][23][24][25][26][27] There is thereby an urgent need but it is still a significant challenge to rationally design and delicately tailor the electroactive MTMOs for advanced LIBs, ECs, MOBs, and FCs. Furthermore, the presence of multiple valences of the cations in such spinel MTMOs systems is helpful to obtain the desirable electrochemical behavior of the electrocatalysts towards the oxygen reduction reaction (ORR) for high-performance MOBs and FCs by providing donor-acceptor chemisorption sites for the reversible adsorption of oxygen.…”

Coordination polymer template synthesis of hierarchical MnCo2O4.5 and MnNi6O8 nanoparticles for electrochemical capacitors electrode

“…By contrast, Mn/Ni-400, Mn/Ni-500 and Mn/Ni-600 electrode have higher specific capacitance retention of 76.6%, 72.3% and 83.2% with a 20 times current density increase, respectively. The rate capability of the MnCo 2 O 4.5 and MnNi 6 O 8 nanoparticles are considered to be very excellent in comparison with many recent reports on ternary oxides nanostructures for ECs, for instance, 48.8% and 51.9% specific capacitance retention for NiCo 2 O 4 rods and sheets (a 20 times current density increase) [26], 81.3% retention for CoFe 2 O 4 rings (a 20 times increase) [27], 78.6% retention for NiCo 2 O 4 nanowires (a 40 times increase) [28], and 11.1% retention for NiMn 2 O 4 rings (an 8 times increase) [29].…”

Gemischte Übergangsmetalloxide: Design, Synthese und energierelevante Anwendungen

“…[101] Daher ist eine verbesserte Ausgangsspannung der vollständigen Zelle zu erwarten, wenn diese mit einem herkçmmlichen Kathodenmaterial wie LiCoO 2 verbunden wird. Die verbesserte elektrochemische Leistung von ZnFe 2 O 4 -NFs kann dem kontinuierlichen Gerüst aus Nano- [21] und MnFe 2 O 4 , [115][116][117] werden auch als pseudokapazitive Materialien für Hochleistungs-EKs untersucht. [12] Seit dem ersten Bericht über eine Verwendung von nanokristallinem ZnFe 2 O 4 und Ag-dotierten ZnFe 2 O 4 -Dünnschichten als Anoden für LIBs [112] gab es zahlreiche Versuche, die Leistung der ZnFe 2 O 4 -Anodenmaterialien mit verschiedenen Strukturen und Morphologien auf Grundlage verschiedener Synthesestrategien weiter zu optimieren, z.…”

“…[14][15][16] Noch wichtiger ist, dass diese MTMOs wegen der relativ geringen Aktivierungsenergie für einen Elektronentransfer zwischen Kationen gewçhnlich eine hçhere elektrische Leitfähigkeit als einfache TMOs aufweisen. [14,[19][20][21][22][23][24][25][26][27] Daher sind ein rationales Design sowie das Maßschneidern der elektroaktiven MTMOs für moderne LIBs, EKs, MOBs und FCs unabdingbar, bleiben aber eine schwierige Aufgabe. [14,[19][20][21][22][23][24][25][26][27] Daher sind ein rationales Design sowie das Maßschneidern der elektroaktiven MTMOs für moderne LIBs, EKs, MOBs und FCs unabdingbar, bleiben aber eine schwierige Aufgabe.…”