Photocatalytic and Cathode Active Abilities of Ni-Substituted α-FeOOH Nanoparticles

Ibrahim, Ahmed; Shiraishi, Mikan; Homonnay, Zoltán; Krehula, Stjepko; Marciuš, Marijan; Bafti, Arijeta; Pavić, Luka; Kubuki, Shiro

doi:10.3390/ijms241814300

Cited by 6 publications

(10 citation statements)

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“…In general, the electrical conductivity mechanism in investigated samples seems to be related to a combination of two dominant factors: (i) ease of electron/polaron mobility jump along with (ii) a decrease in charge carrier concentration. In our previous study [ 17 ], the introduction of Ni at higher concentrations ( x = 0.1–0.5) resulted in a decrease in conductivity throughout the series, albeit higher than the values for pure goethite up to 0.5 Ni-doped goethite. On the other hand, in this study, we introduced up to x = 0.2 of Sn, with a positive effect and increase in conductivity.…”

Section: Resultsmentioning

confidence: 81%

“…The absorption energy is defined as the normalized absorbance at 0.5 of each spectrum [ 54 , 55 ]. In addition, when the absorption energy shifts to high, it indicates that the oxidation state of Fe has increased [ 16 , 17 ].…”

Section: Resultsmentioning

confidence: 99%

“…This example is one of the successful cases for achieving an increasing surface area and a lowering E g by doping different elements into iron oxyhydroxide nanoparticles. Concordant results of photo-Fenton catalytic ability of Ni-substituted goethite (α-Ni x Fe 1− x OOH, Ni100 x ) NPs with an ‘ x ’ of 0.10 showed the surface area of 73.9 m 2 g −1 and the E g of 2.55 eV led to the largest k value of 0.015 min −1 among the studied Ni100 x [ 17 ].…”

Section: Introductionmentioning

confidence: 87%

“…Vitaly et al [ 21 ] showed that RT charge transport in goethite is primarily governed by the thermally activated SPH, with various inequivalent paths for electron hopping, mediated by O and OH species, with the mobility being higher compared to other iron oxyhydroxide (FeOOH) polymorphs. In our recent investigation [ 17 ], which delved into the electrical properties of Ni x Fe 1− x OOH NPs across a wide compositional range ( x = 0–0.5) using impedance spectroscopy, a discernible decrease in DC conductivity was observed with an increase in Ni content. This observation is attributed to the predominant influence of a decrease in Fe content and charge carrier concentration, coupled with an increase in polaron hopping activation energies.…”

Section: Introductionmentioning

confidence: 99%

“…Concerning the development of new cathode active materials for secondary batteries, Ibrahim reported that Ni100 x NPs with an ‘ x ’ of 0.10 showed the highest first discharge capacity of 363 mAh g −1 for the Li-ion battery and that with ‘ x ’ of 0.20 showed that 223 mAh g −1 for the Na-ion battery evaluated under 5 mA g −1 , respectively [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

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Debye Temperature Evaluation for Secondary Battery Cathode of α-SnxFe1−xOOH Nanoparticles Derived from the 57Fe- and 119Sn-Mössbauer Spectra

Ibrahim,

Tani,

Hashi

et al. 2024

IJMS

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Debye temperatures of α-SnxFe1−xOOH nanoparticles (x = 0, 0.05, 0.10, 0.15 and 0.20, abbreviated as Sn100x NPs) prepared by hydrothermal reaction were estimated with 57Fe- and 119Sn-Mössbauer spectra measured by varying the temperature from 20 to 300 K. Electrical properties were studied by solid-state impedance spectroscopy (SS-IS). Together, the charge–discharge capacity of Li- and Na-ion batteries containing Sn100x NPs as a cathode were evaluated. 57Fe-Mössbauer spectra of Sn10, Sn15, and Sn20 measured at 300 K showed only one doublet due to the superparamagnetic doublet, while the doublet decomposed into a sextet due to goethite at the temperature below 50 K for Sn 10, 200 K for Sn15, and 100 K for Sn20. These results suggest that Sn10, Sn15 and Sn20 had smaller particles than Sn0. On the other hand, 20 K 119Sn-Mössbauer spectra of Sn15 were composed of a paramagnetic doublet with an isomer shift (δ) of 0.24 mm s−1 and quadrupole splitting (∆) of 3.52 mm s−1. These values were larger than those of Sn10 (δ: 0.08 mm s−1, ∆: 0.00 mm s−1) and Sn20 (δ: 0.10 mm s−1, ∆: 0.00 mm s−1), suggesting that the SnIV-O chemical bond is shorter and the distortion of octahedral SnO6 is larger in Sn15 than in Sn10 and Sn20 due to the increase in the covalency and polarization of the SnIV-O chemical bond. Debye temperatures determined from 57Fe-Mössbauer spectra measured at the low temperature were 210 K, 228 K, and 250 K for Sn10, Sn15, and Sn20, while that of α-Fe2O3 was 324 K. Similarly, the Debye temperature of 199, 251, and 269 K for Sn10, Sn15, and Sn20 were estimated from the temperature-dependent 119Sn-Mössbauer spectra, which were significantly smaller than that of BaSnO3 (=658 K) and SnO2 (=382 K). These results suggest that Fe and Sn are a weakly bound lattice in goethite NPs with low crystallinity. Modification of NPs and addition of Sn has a positive effect, resulting in an increase in DC conductivity of almost 5 orders of magnitude, from a σDC value of 9.37 × 10−7 (Ω cm)−1 for pure goethite Sn (Sn0) up to DC plateau for samples containing 0.15 and 0.20 Sn (Sn15 and Sn20) with a DC value of ~4 × 10−7 (Ω cm)−1 @423 K. This non-linear conductivity pattern and levelling at a higher Sn content suggests that structural modifications have a notable impact on electron transport, which is primarily governed by the thermally activated via three-dimensional hopping of small polarons (SPH). Measurements of SIB performance, including the Sn100x cathode under a current density of 50 mA g−1, showed initial capacities of 81 and 85 mAh g−1 for Sn0 and Sn15, which were larger than the others. The large initial capacities were measured at a current density of 5 mA g−1 found at 170 and 182 mAh g−1 for Sn15 and Sn20, respectively. It is concluded that tin-goethite NPs are an excellent material for a secondary battery cathode and that Sn15 is the best cathode among the studied Sn100x NPs.

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Section: Resultsmentioning

confidence: 81%