Battery-like behavior of Ni-ceria based systems: Synthesis, surface defects and electrochemical assessment

Araújo, Allan J.M.; Silva, Vinícius D.; Sousa, Angel R.O.; Grilo, João P.F.; Simões, Thiago A.; Macedo, Daniel A.; Nascimento, Rubens Maribondo do; Paskocimas, C. A.

doi:10.1016/j.ceramint.2018.12.222

Cited by 27 publications

(21 citation statements)

References 70 publications

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“…As a reference, the XRD of a CeO 2 prepared at pH = 8 using the same method is included. The calculated lattice parameters were close to those reported for both standard cubic NiO (4.1771 Å) [36], CeO 2 (5.4110 Å) [3], and Ce-8 (5.410 Å). However, it is worth noting that, in the case of CeO 2 , the values obtained are always below the reported lattice parameter and the difference is higher in the case of the sample prepared at a lower pH (Ni-Ce-8).…”

Section: Resultssupporting

confidence: 81%

“…However, it is worth noting that, in the case of CeO 2 , the values obtained are always below the reported lattice parameter and the difference is higher in the case of the sample prepared at a lower pH (Ni-Ce-8). This effect has been observed by several authors and was explained as being due to the incorporation of Ni 2+ into the ceria network [36,37]. According to these results, it seems that the amount on Ni 2+ that replaces Ce 4+ is higher when the synthesis of the mixed oxides is carried out at a lower pH.…”

Section: Resultssupporting

confidence: 70%

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Catalytic Soot Oxidation Activity of NiO–CeO2 Catalysts Prepared by a Coprecipitation Method: Influence of the Preparation pH on the Catalytic Performance

et al. 2019

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A series of NiO–CeO2 mixed oxide catalysts have been synthesized by a modified coprecipitation method at three different pH values (pH = 8, 9, and 10). The NiO–CeO2 mixed oxide samples were characterized by TGA, XRD, inductively coupled plasma atomic emission spectroscopy (ICP-AES), FTIR, Brunauer–Emmett–Teller (BET) surface area, H2 temperature-programmed reduction (H2-TPR), and electron microscopy (high-angle annular dark-field transmission electron microscopy/energy-dispersive X-ray spectroscopy (HAADF-TEM/EDS)). The catalytic activities of the samples for soot oxidation were investigated under loose and tight contact conditions. The catalysts exhibited a high BET surface area with average crystal sizes that varied with the pH values. Electron microscopy results showed the formation of small crystallites (~5 nm) of CeO2 supported on large plate-shaped particles of NiO (~20 nm thick). XRD showed that a proportion of the Ni2+ was incorporated into the ceria network, and it appeared that the amount on Ni2+ that replaced Ce4+ was higher when the synthesis of the mixed oxides was carried out at a lower pH. Among the synthesized catalysts, Ni-Ce-8 (pH = 8) exhibited the best catalytic performance.

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Section: Resultssupporting

confidence: 81%

Section: Resultssupporting

confidence: 70%

Catalytic Soot Oxidation Activity of NiO–CeO2 Catalysts Prepared by a Coprecipitation Method: Influence of the Preparation pH on the Catalytic Performance

et al. 2019

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“…The slope (b = ip/v 1/2 ) values are 266 and 158 (anodic currents) and -251 and -157 (cathodic currents) for samples synthesized with pH 9 and 3, respectively. These values indicate diffusion rates with surface redox reactions characteristics of charge storage processes that are controlled by diffusion, confirming the battery-like behavior[79]. Besides, the rates of reversible surface redox…”

supporting

confidence: 74%

“…where i is the discharge current (A), Δt is the discharge time (s) and m is the mass of the active material (g) [79,81]. As shown by the GCD curves, the electrode made with powders synthesized with pH 9 has significantly higher charging and discharging times in comparison to the electrode derived from the powder obtained with pH 3.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

The authors have requested that this preprint be removed from Research Square.

Silva¹,

Raimundo²,

Ferreira³

et al. 2021

Preprint

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In this paper we studied the production of single-phase NiFe2O4 powders synthesized by the complexation method combining EDTA-citrate. The structural, optical, magnetic, and electrochemical properties of were studied as a function of the synthesis pH. Powders obtained with pH 9 showed larger crystallite sizes (73 nm) in comparison to those produced with pH 3 (21 nm). The band gap energy was found to be inversely proportional to the crystal size (1.85 and 2.0 eV for powders with crystallites of 73 nm and 21 nm, respectively). The synthesized materials presented an inverse spinel crystalline structure. The samples obtained at higher pH conditions were found to be fully magnetic saturated with a saturation magnetization of 50.5 emu g-1, while that synthesized at pH 3 is unsaturated with a maximum measured magnetization of 48.4 emu g-1. Cyclic voltammetry and charge-discharge curves indicate a battery-type behavior, with an better performance for the material obtained at pH 9 (65 C g-1 at a specific current of 3 A g-1). The remarkable performance of the associated with its by microstructural characteristics (particle size, particle agglomeration and porosity). This work offers an alternative synthesis route for obtaining spinel ferrites for magnetic and electrochemical applications.

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“…The GCD curves of all NiFe 2 O 4 based‐electrodes are typical of battery‐like electrodes 57,58,66 . For this reason, the specific capacities (Q S ) were calculated by using the following Equation (3):

\begin{equation}{Q_{s{\rm{\;}}}} = {\rm{\;}}\frac{{i{\rm{\;}}\Delta t}}{m},\end{equation}

where i is the discharge current (A), Δt is the discharge time (s), and m is the mass of the active material (g) 65,67 . As shown by the GCD curves, the electrode made with powders NF9 has significantly higher charging and discharging times in comparison to the electrode derived from the powder NF3.…”

Section: Resultsmentioning

confidence: 99%

Effects of morphology on the electrochemical performance of NiFe₂O₄nanoparticles with battery‐type behavior

Silva

Raimundo

Ferreira

et al. 2022

Int J Applied Ceramic Tech

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We report the synthesis of NiFe2O4 nanoparticles by the complexation EDTA‐citrate method under acidic (pH = 3) and basic (pH = 9) conditions. The structural, optical, vibrational, magnetic, and electrochemical properties were studied. The samples have crystallite sizes of 21 nm (pH 3) and 73 nm (pH 9), with rounded particles and layered structures. The 57Fe Mössbauer spectra at 12 K showed that both samples had an inverse spinel cation distribution. At 5 K, the sample prepared at pH 9 showed saturation magnetizations of about 50 emu/g. Raman spectra showed typical bands of NiFe2O4 phase. The materials were tested as electrodes under alkaline condition. The cyclic voltammetry and charge‐discharge experiments indicated a battery‐type behavior, with maximun capacities of 65 and 5 C/g (at specific currents of 3 and 10 A/g) for samples prepared at pH 9 and 3, respectively. This work offers a route for obtaining NiFe2O4 nanoparticles with different morphologies and sizes tuned by the synthesis conditions.

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Battery-like behavior of Ni-ceria based systems: Synthesis, surface defects and electrochemical assessment

Cited by 27 publications

References 70 publications

Catalytic Soot Oxidation Activity of NiO–CeO2 Catalysts Prepared by a Coprecipitation Method: Influence of the Preparation pH on the Catalytic Performance

Catalytic Soot Oxidation Activity of NiO–CeO2 Catalysts Prepared by a Coprecipitation Method: Influence of the Preparation pH on the Catalytic Performance

The authors have requested that this preprint be removed from Research Square.

Effects of morphology on the electrochemical performance of NiFe₂O₄nanoparticles with battery‐type behavior

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Battery-like behavior of Ni-ceria based systems: Synthesis, surface defects and electrochemical assessment

Cited by 27 publications

References 70 publications

Catalytic Soot Oxidation Activity of NiO–CeO2 Catalysts Prepared by a Coprecipitation Method: Influence of the Preparation pH on the Catalytic Performance

Catalytic Soot Oxidation Activity of NiO–CeO2 Catalysts Prepared by a Coprecipitation Method: Influence of the Preparation pH on the Catalytic Performance

The authors have requested that this preprint be removed from Research Square.

Effects of morphology on the electrochemical performance of NiFe2O4nanoparticles with battery‐type behavior

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Effects of morphology on the electrochemical performance of NiFe₂O₄nanoparticles with battery‐type behavior