Fe K-Edge X-ray absorption near-edge spectroscopy (XANES) and X-ray diffraction (XRD) analyses of LiFePO4 and its base materials

Latif, Chaironi; Negara, V S I; Wongtepa, Weeraya; Thamatkeng, P.; Zainuri, Mochamad; Pratapa, Suminar

doi:10.1088/1742-6596/985/1/012021

Cited by 9 publications

(8 citation statements)

References 9 publications

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“…The result showed that Si atom primarily exists and aligned well with the standard spectrum (Norouzi Banis et al, 2019). Latif et al investigated the XANES spectrum in LiFePO4 in Fe K-edge that showed pre-edge and edge regions to determine oxidation state of Fe from the energy absorption range (Latif et al, 2018). The absorption edge energy (E0) is used to determine the oxidation state and can be seen clearly using the first derivative of normalized absorption (Chiang et.al., 2012).…”

Section: Introductionmentioning

confidence: 54%

Oxidation State analysis of LiFeSixP1-xO4/C (x = 0.06) with X-ray Absorption Near Edge Structure (XANES) in Fe K-edge and Si K-edge

Intifadhah

Maghfirohtuzzoimah

Az-Zahra

et al. 2021

J. Phys.: Theor. Appl.

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The development of LiFePO4 as a cathode materials on lithium-ion battery was increased with the use of additional techniques such as atomic doping and coating. The material used in this report was LiFeSi0.06P0.94O4/C (LFP Si-6%), synthesized with doping silicon 6% and 11wt% carbon coating by a solid state method. X-ray Absorption Spectroscopy (XAS) characterization was used to investigate the effect on electronic and atomic structure of LFP Si-6%, especially in X-ray Absorption Near Edge Strucuture (XANES) region. XANES data measured on Fe K-edge and Si K-edge. Fe foil, FeO, Fe2O3, FePO4, Si powder, SiO, SiO2 were used as a standard sample for comparison with the result of LFP Si-6%. XANES analysis showed that the energy absorption of Fe K-edge and Si K-edge in LFP Si-6% was 7124.94 eV and 1846.16 eV, respectively. The oxidation state of Fe was Fe2.576+ between Fe2+ and Fe3+, while Si was close to the estimation of Si4+. In addition, the linear combination fitting (LCF) in XANES Fe K-edge was performed to show the ratio of Fe2+/Fe3+ (FeO/Fe2O3).

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Section: Introductionmentioning

confidence: 54%

Oxidation State analysis of LiFeSixP1-xO4/C (x = 0.06) with X-ray Absorption Near Edge Structure (XANES) in Fe K-edge and Si K-edge

Intifadhah

Maghfirohtuzzoimah

Az-Zahra

et al. 2021

J. Phys.: Theor. Appl.

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“…The absorption edge of α-Ni x Fe 1−x OOH NPs was observed at 7122.65 ± 0.01, 7122.49 ± 0.01, 7122.27 ± 0.01, 7122.15 ± 0.01, 7122.23 ± 0.01, 7121.91 ± 0.01, 7122.08 ± 0.01, and 7122.28 ± 0.01 with ‘x’ 0, 0.05, 0.10, 0.15, 0.20, 0.30, 0.40, and 0.50, respectively, as shown in the insert figure in Figure 4 a. The increasing oxidation state of Fe results in a shift of the absorption edge to higher energy [ 27 ]; according to the above, the values of the absorption edge of α-Ni x Fe 1−x OOH NPs are higher than the values of Fe 2 O 3 (Fe 3+ ), this implies that none of the α-Ni x Fe 1−x OOH NPs samples contained Fe 2+ , and they contained only Fe 3+ . The pre-edge peak was found at 7113 eV for α-Ni x Fe 1−x OOH NPs and at 7114 eV for both Fe-foil and Fe 2 O 3 , being designated as the absorption edge.…”

Section: Resultsmentioning

confidence: 99%

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

Ibrahim,

Shiraishi,

Homonnay

et al. 2023

IJMS

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The present study investigates the relationship between the local structure, photocatalytic ability, and cathode performances in sodium-ion batteries (SIBs) and lithium-ion batteries (LIBs) using Ni-substituted goethite nanoparticles (NixFe1−xOOH NPs) with a range of ‘x’ values from 0 to 0.5. The structural characterization was performed applying various techniques, including X-ray diffractometry (XRD); thermogravimetry differential thermal analysis (TG-DTA); Fourier transform infrared spectroscopy (FT-IR); X-ray absorption spectroscopy (XANES/EXAFS), both measured at room temperature (RT); 57Fe Mössbauer spectroscopy recorded at RT and low temperatures (LT) from 20 K to 300 K; Brunauer–Emmett–Teller surface area measurement (BET), and diffuse reflectance spectroscopy (DRS). In addition, the electrical properties of NixFe1−xOOH NPs were evaluated by solid-state impedance spectroscopy (SS-IS). XRD showed the presence of goethite as the only crystalline phase in prepared samples with x ≤ 0.20, and goethite and α-Ni(OH)2 in the samples with x > 0.20. The sample with x = 0.10 (Ni10) showed the highest photo-Fenton ability with a first-order rate constant value (k) of 15.8 × 10−3 min−1. The 57Fe Mössbauer spectrum of Ni0, measured at RT, displayed a sextet corresponding to goethite, with an isomer shift (δ) of 0.36 mm s−1 and a hyperfine magnetic distribution (Bhf) of 32.95 T. Moreover, the DC conductivity decreased from 5.52 × 10−10 to 5.30 × 10−12 (Ω cm)–1 with ‘x’ increasing from 0.10 to 0.50. Ni20 showed the highest initial discharge capacity of 223 mAh g−1, attributed to its largest specific surface area of 174.0 m2 g−1. In conclusion, NixFe1−xOOH NPs can be effectively utilized as visible-light-activated catalysts and active cathode materials in secondary batteries.

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“…The absorption edge of α-Ni x Fe 1−x OOH NPs was observed at 7122.65 ± 0.01, 7122.49 ± 0.01, 7122.27 ± 0.01, 7122.15 ± 0.01, 7122.23 ± 0.01, 7121.91 ± 0.01, 7122.08 ± 0.01, and 7122.28 ± 0.01 with 'x' 0, 0.05, 0.10, 0.15, 0.20, 0.30, 0.40, and 0.50, respectively, as shown in the insert figure in Figure 4a. The increasing oxidation state of Fe results in a shift of the absorption edge to higher energy [27]; according to the above, the values of the absorption edge of α-Ni x Fe 1−x OOH NPs are higher than the values of Fe 2 O 3 (Fe 3+ ), this implies that none of the α-Ni x Fe 1−x OOH NPs samples contained Fe 2+ , and they contained only Fe 3+ . The pre-edge peak was found at 7113 eV for α-Ni x Fe 1−x OOH NPs and at 7114 eV for both Fe-foil and Fe 2 O 3 , being designated as the absorption edge.…”

Section: Xafs Spectra Of α-Ni X Fe 1−x Ooh Npsmentioning

confidence: 85%

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

Ibrahim,

Shiraishi,

Homonnáy

et al. 2023

Preprint

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The present study investigates the relationship between the local structure, photocatalytic ability, and cathode performances in sodium-ion batteries (SIBs) and lithium-ion batteries (LIBs) using Ni-substituted goethite nanoparticles (NixFe1-xOOH NPs) with a range of 'x' values from 0 to 0.5. The structural characterization was performed applying various techniques, including X-ray diffractometry (XRD), Thermogravimetry differential thermal analysis (TG-DTA), Fourier Transform Infrared Spectroscopy (FT-IR), X-ray absorption spectroscopy (XANES/EXAFS), both measured at room temperature (RT), and 57Fe Mössbauer spectroscopy recorded at RT and at low temperatures (LT) from 20 K to 300 K, Brunauer-Emmett-Teller surface area measurement (BET), and diffuse reflectance spectroscopy (DRS). In addition, the electrical properties of NixFe1-xOOH NPs were evaluated by impedance spectroscopy. XRD showed the presence of goethite as the only crystalline phase in prepared samples with x ≤ 0.20, and goethite and α-Ni(OH)2 in the samples with x > 0.20. Sample with x = 0.10 (Ni10) showed the highest photo-Fenton ability with a first-order rate constant value (k) of 15.8×10-3 min-1. The 57Fe Mössbauer spectrum of Ni0, measured at RT, displayed a sextet corresponding to goethite, with an isomer shift (δ) of 0.36 mm s-1 and a hyperfine magnetic distribution (Bhf) of 32.95 T. Moreover, the DC conductivity decreased from 5.52×10-10 to 5.30×10-12 (Ω.cm)–1 with 'x' increasing from 0.10 to 0.50. Ni20 showed the highest initial discharge capacity of 223 mAh g-1, attributed to its largest specific surface area of 174.0 m2 g-1. In conclusion, NixFe1-xOOH NPs can be effectively utilized as visible-light-activated catalysts and active cathode materials in secondary batteries.

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Fe K-Edge X-ray absorption near-edge spectroscopy (XANES) and X-ray diffraction (XRD) analyses of LiFePO₄ and its base materials

Cited by 9 publications

References 9 publications

Oxidation State analysis of LiFeSixP1-xO4/C (x = 0.06) with X-ray Absorption Near Edge Structure (XANES) in Fe K-edge and Si K-edge

Oxidation State analysis of LiFeSixP1-xO4/C (x = 0.06) with X-ray Absorption Near Edge Structure (XANES) in Fe K-edge and Si K-edge

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

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

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