Monitoring the hydrothermal precipitation of α-Fe2O3 from concentrated Fe(NO3)3 solutions partially neutralized with NaOH

Žic, Mark; Ristić, Mira; Musić, Svetozar

doi:10.1016/j.molstruc.2010.09.048

Cited by 22 publications

(4 citation statements)

References 26 publications

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“…2a-c. Comparing the whole reaction energy profile of Fe 2 O 3 with that on Pt electrode (Fig. 2g) 27 . All diffraction peaks of the typical X-ray diffraction pattern (see Supplementary Fig.…”

Section: Resultsmentioning

confidence: 99%

Rational screening low-cost counter electrodes for dye-sensitized solar cells

et al. 2013

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Dye-sensitized solar cells have attracted intense research attention owing to their ease of fabrication, cost-effectiveness and high efficiency in converting solar energy. Noble platinum is generally used as catalytic counter electrode for redox mediators in electrolyte solution. Unfortunately, platinum is expensive and non-sustainable for long-term applications. Therefore, researchers are facing with the challenge of developing low-cost and earthabundant alternatives. So far, rational screening of non-platinum counter electrodes has been hamstrung by the lack of understanding about the electrocatalytic process of redox mediators on various counter electrodes. Here, using first-principle quantum chemical calculations, we studied the electrocatalytic process of redox mediators and predicted electrocatalytic activity of potential semiconductor counter electrodes. On the basis of theoretical predictions, we successfully used rust (a-Fe 2 O 3 ) as a new counter electrode catalyst, which demonstrates promising electrocatalytic activity towards triiodide reduction at a rate comparable to platinum.

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Section: Resultsmentioning

confidence: 99%

Rational screening low-cost counter electrodes for dye-sensitized solar cells

et al. 2013

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“…For instance, Wang et al [48] observed three patterns of band vibration for the same material, one at 578 cm −1 , and two at 485 cm −1 and 380 cm −1 and the authors correlated these bands with the size, shape, and internal structure of the Fe 2 O 3 particles. Žic et al [49] investigated the influence of nitrate anions on the properties of hematite particles (α-Fe 2 O 3 ) and obtained four vibration modes at 571, 461, 397 and 343 cm −1 associated to Fe-O stretching vibrations. Grigorie et al [50], from the transformation of the maghemite phase (γ-Fe 2 O 3 ) into hematite (α-Fe 2 O 3 ), found two vibration bands at 542 and 488 cm −1 associated with the Fe-O bond vibrations.…”

Section: Infrared Spectroscopymentioning

confidence: 99%

Development of Sustainable Heterogeneous Catalysts for the Photocatalytic Treatment of Effluents

et al. 2020

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The inadequate discharge of effluents from different sources without prior treatment can impact the characteristics of soil and water, which reflect serious environmental problems. Advanced oxidative processes (AOP) appear as a viable alternative for environmental remediation, including wastewater treatment. Herein, α-MoO3 and α-Fe2O3 semiconductors were synthesized at low temperature by a Pechini-based method and then applied in photocatalysis. The catalytic efficiency was performed under visible light toward the degradation of an organic persistent pollutant (Rhodamine B dye, RhB), commonly present in industries wastewater. The results indicated that the synthesized α-MoO3 or α-Fe2O3 photocatalysts presented a pronounced activity and promoted an efficient RhB degradation after 15 min of reaction. α-MoO3 had a degradation efficiency of 93% and 98%, while α-Fe2O3 showed 67% and 100% RhB degradation without and with the addition of H2O2, respectively. These results suggest that the synthesized oxides have high oxi-reductive capacity, which can be used for a fast and effective photodegradation of RhB and other organic persistent pollutants to minimize environmental impacts.

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“…These findings show that the peaks at roughly 30°, 49° and 57° 2θ in the XRD graph of the raw material originate from the (204), (331) and (511) planes of chalcopyrite [ 28 ]. Additionally, the semi-product contained the planes of copper nitrate (202), (400), and (204) at 18°, 24°, and 29° [ 29 ] as well as the planes of iron nitrate (012), (110) at 22°, 36°, and 39° [ 30 ]. The planes of copper ferrite (311), (222), (400), (331), (511), (440) and (300) at about 35°, 39°, 42°, 45°, 56°, 61° and 64° were detected in the hydrothermally created final electrode [ 31 ].…”

Section: Resultsmentioning

confidence: 99%

Sustainable Cauliflower-Patterned CuFe2O4 Electrode Production from Chalcopyrite for Supercapacitor Applications

2023

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The primary purpose of this study was to produce an ore-based high-capacity supercapacitor electrode. For this, chalcopyrite ore was first leached with nitric acid, and then metal oxide synthesis was carried out immediately on nickel foam using a hydrothermal technique from the solution. Cauliflower-patterned CuFe2O4 with a wall thickness of about 23 nm was synthesized on the Ni foam surface, characterized by XRD, FTIR, XPS, SEM, and TEM investigations. The produced electrode also displayed a feature of a battery-like charge storage mechanism with a specific capacity of 525 mF cm−2 at 2 mA cm−2 current density, energy of 8.9 mWh cm−2, and a power density of 233 mW cm−2. Additionally, even after 1350 cycles, this electrode still performed at 109% of its original capacity. The performance of this finding is 255% higher than that of the CuFe2O4 in our earlier investigation; despite being pure, it performs far better than some of its equivalents in the literature. Obtaining such performance from an electrode made from ore indicates that the use of ore has a lot of potential for supercapacitor production and property improvement.

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Monitoring the hydrothermal precipitation of α-Fe2O3 from concentrated Fe(NO3)3 solutions partially neutralized with NaOH

Cited by 22 publications

References 26 publications

Rational screening low-cost counter electrodes for dye-sensitized solar cells

Rational screening low-cost counter electrodes for dye-sensitized solar cells

Development of Sustainable Heterogeneous Catalysts for the Photocatalytic Treatment of Effluents

Sustainable Cauliflower-Patterned CuFe2O4 Electrode Production from Chalcopyrite for Supercapacitor Applications

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