Influence of low-spin Co3+ for high-spin Fe3+ substitution on the structural, magnetic, optical and catalytic properties of hematite (α-Fe2O3) nanorods

Popov, Nina; Bošković, Marija; Perović, M.; Németh, Zoltán; Wang, Junhu; Kuang, Zhichong; Reissner, M.; Кузманн, Э.; Homonnay, Z.; Kubuki, Shiro; Marciuš, Marijan; Ristić, Mira; Musić, Svetozar; Stanković, Dalibor M.; Krehula, Stjepko

doi:10.1016/j.jpcs.2020.109929

Cited by 14 publications

(5 citation statements)

References 109 publications

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“…The precipitate obtained from this synthesis process is in the form of brick red and black powder. The reaction mechanism according to [5,12,13] is as follows:…”

Section: Results and Discussion Synthesis Co-doped Hematitementioning

confidence: 99%

The Effect of Cobalt Doping on the Hematite Material Synthesized Using Precipitation Method as a Lithium-Ion Battery Anode

Suyati,

Rizky,

Al-Zaitun

et al. 2023

CJMS

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Hematite is an iron oxide that has the most stable and environmentally friendly structure. Hematite is used as a good anode material, this is due to its high specific capacity, good chemical and thermal stability, and low cost. Hematite has weaknesses, namely poor cycle stability, unable to withstand volume changes, and low conductivity values. To improve the electrochemical performance of lithium-ion batteries, modifications are made to the anode material by adding a dopant. This research aims to synthesize Co-doped hematite material with variations of 0.2, 4, and 6.8% using NaOH and KOH precipitating agents, characterize Co-doped hematite material using FTIR, XRD, SEM-EDX, and analyze its electrochemical performance as a lithium-ion battery anode. The method used is deposition. The synthesis results obtained brick red and black precipitates. FTIR characterization shows that the sample contains the Fe-O-Fe functional group which appears at wave numbers 519.19 and 517.32 cm-1. Based on XRD characterization, samples of undoped hematite and 6% Co had crystal sizes of 26.4193 nm and 20.6927 nm. SEM characterization results show that the morphology of the 6% Co-doped hematite sample has an irregular semi-spherical shape. The electrochemical test results show that the battery with the best electrochemical performance was produced by a 6% Co-doped hematite sample which had a conductivity value of 2.35 x 10-3 S/cm and the resulting battery capacity efficiency reached 99.9%.

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“…The precipitate obtained from this synthesis process is in the form of brick red and black powder. The reaction mechanism according to [5,12,13] is as follows:…”

Section: Results and Discussion Synthesis Co-doped Hematitementioning

confidence: 99%

The Effect of Cobalt Doping on the Hematite Material Synthesized Using Precipitation Method as a Lithium-Ion Battery Anode

Suyati,

Rizky,

Al-Zaitun

et al. 2023

CJMS

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“…Strong absorption of hematite in the UV range was attributed to the O 2p → Fe 3d charge transfer [40,41]. The absorption of UV and visible radiation (UV-Vis absorption spectrum) by hematite strongly depends on the particle size [41,42] but also on the particle shape [43][44][45] and doping [46][47][48][49]. The energy of the band gap for hematite is determined by the position of the absorption edge in the UV-Vis absorption spectrum and for bulk hematite is about 2.2 eV [50] but can be significantly higher for very small (nano-size) hematite particles [41,42] or lower, as in the case of some doped hematite samples [46][47][48][49].…”

Section: Uv-vis-nir Spectroscopymentioning

confidence: 99%

Polymer Composites of Low-Density Polyethylene (LDPE) with Elongated Hematite (α-Fe2O3) Particles of Different Shapes

Kratofil Krehula,

Peršić,

Popov

et al. 2024

J. Compos. Sci.

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Due to the intensive search for new types of advanced polymer materials for targeted applications, this work offers insight into the properties of low-density polyethylene/hematite composites. The specific feature of this study lies in the use of elongated hematite particles of different shapes. Uniform ellipsoid-, peanut- and rod-shaped hematite particles were hydrothermally synthesized and incorporated into the polymer matrix of low-density polyethylene (LDPE). LDPE/hematite composites are prepared by melt mixing. Hematite particles are characterized by scanning electron microscopy (SEM) and powder X-ray diffraction (PXRD). The pure LDPE polymer and LDPE/hematite composites were studied by FT-IR and UV-Vis-NIR spectroscopy and by thermogravimetric analysis (TGA). The determination of the mechanical and barrier properties was also carried out. The obtained results indicate the influence of the elongated particles on the improvement of LDPE properties. An increase in thermal stability and UV-absorption was observed as well as the improvement of mechanical and barrier properties. The improvement of the composites’ properties in comparison to the pure LDPE is especially visible in the composites prepared with low content of hematite (0.25%). LDPE/hematite composites have promising characteristics for application as packaging materials with enhanced mechanical, thermal and barrier properties as well as UV-protective materials.

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“…As already discussed, this positively influences the catalytic reaction considering that this decrease could interfere in the oxidation-reduction process and would cause greater durability of the structure. In addition, the presence of the species that are detected by this technique promotes active oxygen vacancies during the reaction, accelerating the combustion process [31].…”

Section: Physicochemical Characterization Of the Catalystsmentioning

confidence: 99%

Highly Resistant LaCo1−xFexO3 Perovskites Used in Chlorobenzene Catalytic Combustion

et al. 2022

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The stability of LaCo1−xFexO3 perovskite structures (x = 0; 0.25; 0.5; 0.75; 1) was studied in the combustion of chlorobenzene. This family of catalysts was synthesized by the citrate method obtaining pure structures. The Fe doping in the original structure induces electronic environments capable of generating the Co2+/Co3+ redox couple. The characteristics observed in bulk are perfectly reflected on the surface, favoring a high resistance of the solids to chlorine poisoning. Superior stability under reaction conditions was observed in the phase with the lowest Fe content (x = 0.25), remaining stable at 100% combustion of chlorobenzene during 100 h, not observing intermediate reaction products. These results open up a new avenue for designing and fabricating high-performance catalysts in the environmental field

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Influence of low-spin Co3+ for high-spin Fe3+ substitution on the structural, magnetic, optical and catalytic properties of hematite (α-Fe2O3) nanorods

Cited by 14 publications

References 109 publications

The Effect of Cobalt Doping on the Hematite Material Synthesized Using Precipitation Method as a Lithium-Ion Battery Anode

The Effect of Cobalt Doping on the Hematite Material Synthesized Using Precipitation Method as a Lithium-Ion Battery Anode

Polymer Composites of Low-Density Polyethylene (LDPE) with Elongated Hematite (α-Fe2O3) Particles of Different Shapes

Highly Resistant LaCo1−xFexO3 Perovskites Used in Chlorobenzene Catalytic Combustion

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