Coprecipitated Transition Metal Ferrites Investigated by XPS

Diodati, Stefano; Gross, Silvia

doi:10.1116/11.20121106

Cited by 7 publications

(4 citation statements)

References 49 publications

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“…A plot of the experimentally determined binding energy shifts for the Fe 2p and Mn 2p peaks compared to the literature in Figure 2d supports the oxidation state assignments for the MFC electrodes close to the surface area. The binding energies and shake-up satellite position for the Fe and Mn oxides are very similar to previously reported results [29] for Fe-Mn mixed oxide prepared by microemulsion methods where the Fe-Mn phases [29,[45][46][47] are distributed homogeneously. The Mn-Fe interactions are expected to be enhanced as the homogeneity increases and is typically observed with oxide particles in the nanometer range.…”

Section: Microstructures and Properties Of Electrodessupporting

confidence: 89%

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A Novel Ternary Pseudocapacitive Electrode with Synergistic Contributions

Zhou,

Tynan,

Dai

et al. 2024

Advanced Energy Materials

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Ternary electrodes represent an exciting strategy to substantially enhance the performance of supercapacitors beyond what binary electrodes offer. However, the interplays among ternary constituents and their possible synergies remain poorly understood. This study investigates a ternary electrode design, wherein ferric oxyhydroxide (FeOOH) and magnesium dioxide (MnO2) are co‐deposited onto carbon nanotube (CNT) mats. The results reveal that the ternary electrode demonstrates a 33.3% reduction in internal resistance and a 59% increase in areal capacitance compared to its binary MnO2/CNT counterpart. Furthermore, the ternary electrode achieves a 25% increase in capacitance compared to the combined capacitances of separate MnO2/CNT and FeOOH/CNT electrodes. These findings demonstrate that combining FeOOH and MnO2 can synergistically enhance electrical conductivity and pseudocapacitance beyond their binary counterparts. This design yields a surface capacitance exceeding 3500 mF cm−2 at an active material loading up to 15 mg cm−2. By pairing with a binary FeOOH/CNT electrode, the resulting asymmetric supercapacitor exhibits an operational voltage window to 1.6 V. To demonstrate the potential of the new design, ternary electrodes are integrated into wearable and structural supercapacitors. The new synergistic ternary electrode approach provides a promising avenue for enhancing energy storage capacitance and expanding the scope of energy storage structure applications.

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Section: Microstructures and Properties Of Electrodessupporting

confidence: 89%

“…XPS spectra for MFC electrodes. a) Fe 2p, b) Mn 2p, and c) O 1s peaks and curve fitting with d) the corresponding experimental binding energy values for Mn 2p and Fe 2p peaks compared to the literature as a function of oxidation state [29,[45][46][47].…”

mentioning

confidence: 99%

A Novel Ternary Pseudocapacitive Electrode with Synergistic Contributions

Zhou,

Tynan,

Dai

et al. 2024

Advanced Energy Materials

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“…The peaks centered at 718.5 eV correspond to satellite peaks of Fe [29,30]. In the case of oxygen, the core-level spectrum of O 1s is observed to be centered at 531 eV which is attributed to the lattice oxygen atoms and the peak centered at 529 eV is ascribed to the presence of oxygen vacancies (figure 4(c)) [31]. The peak observed at 531.7 eV could be due to the chemisorbed oxygen lying on the surface of the samples and may simply be an artifact of fitting of asymmetric XPS peaks with symmetric Gaussian functions [32].…”

Section: Resultsmentioning

confidence: 95%

Structural, chemical and low-temperature magnetic properties of lead-Free 0.6NiFe2O4-0.4Na0.5Bi0.5TiO3 magnetoelectric composite

Kumar

Sarathbavan

Kumar

et al. 2021

J Mater Sci: Mater Electron

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We report on structural, chemical and low temperature magnetic properties of lead free 0.6NiFe2O4 -0.4Na0.5Bi0.5TiO3 composite. NiFe2O4 (NFO) and Na0.5Bi0.5TiO3 (NBTO) are seen to crystallize in inverse spinel and perovskite structure respectively. 0.6NiFe2O4 -0.4Na0.5Bi0.5TiO3 composite exhibits both NFO and NBTO phases in appropriate composition.Zero field cooled (ZFC) and field cooled (FC) magnetization measurements carried out from 15 K to 300 K shows a large bifurcation at room temperature. ZFC and FC magnetization measurement exhibit a hump at Tm ⁓ 259.5 K, indicates the possible existence of competing magnetic interactions in 0.6NiFe2O4 -0.4Na0.5Bi0.5TiO3 composite. Saturation magnetization, remanent magnetization and coercivity values are observed to increase with decreasing the temperature. Temperature dependent saturation magnetization is fit to the Bloch's law.Magnetocrystalline anisotropy (K1) value at various temperatures are estimated and is seen to increase from 0.23 x10 4 erg/cc (at 300 K) to 0.34 x10 4 erg/cc (at 15 K).

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“…The observed small size of the nanocrystalline particles obtained (Table 2 in the ESI) suggests that nucleation occurred relatively rapidly within the reaction mixture, with particle nucleation being kinetically favoured over growth. The choice of oxalate as a [109][110][111] as well as the manganese and strontium perovskites MnFeO 3 [109][110][111] and SrFeO 3-d [109,112].…”

Section: Basics Of Hydrothermal Synthesis and Crystallisation Under Hydrothermal Conditionsmentioning

confidence: 99%

Very low temperature wet-chemistry colloidal routes for mono- and polymetallic nanosized crystalline inorganic compounds

Dolcet

Diodati

Casarin

et al. 2014

J Sol-Gel Sci Technol

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The use of low temperature, sustainable processes based on cheap and safe chemicals as well as nontoxic, easy to handle chemicals and solvents is a challenging issue in modern inorganic chemistry; moreover the obtainment of crystalline functional nanostructures at low or even room temperature is the goal of many synthetic efforts. Within this framework, in these last years, we have developed in our group different room or low temperature (T \ 150°C) wet chemistry colloidal routes to prepare different inorganic functional nanomaterials. These compounds range from (1) ferrites to (2) pure and doped metal oxides, sulphides and halogenides, to (3) metal/metal oxide nanocomposites. The adopted wet chemistry routes encompassed (1) miniemulsions, (2) coprecipitation combined with hydrothermal route and (3) more classical colloidal routes, though revised in some critical aspects. This mini-review provides an overview of the main features as well as the pros and cons of the proposed routes for the obtainment of targeted inorganic systems for applications in optical bioimaging or in energy applications. It not only summarises already published work, but also presents some exciting perspectives disclosed by performed studies and past experience as well as comparisons with state-of-the-art research.

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Coprecipitated Transition Metal Ferrites Investigated by XPS

Cited by 7 publications

References 49 publications

A Novel Ternary Pseudocapacitive Electrode with Synergistic Contributions

A Novel Ternary Pseudocapacitive Electrode with Synergistic Contributions

Structural, chemical and low-temperature magnetic properties of lead-Free 0.6NiFe2O4-0.4Na0.5Bi0.5TiO3 magnetoelectric composite

Very low temperature wet-chemistry colloidal routes for mono- and polymetallic nanosized crystalline inorganic compounds

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