Synthesis, Characterization, and NIR Reflectance of Highly Dispersed NiTiO3and NiTiO3/TiO2Composite Pigments

Tong, Yuping; Jing, Fu; Chen, Zheng

doi:10.1155/2016/5464978

Cited by 8 publications

(3 citation statements)

References 15 publications

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“…018), (027), and (300) planes in the case of bare and Pd-and Pt-modified NiTiO 3 and are in agreement with the ilmenite structure, and the planes correspond to rhombohedral NiTiO 3 . 22,23 Besides, the very weak peak appearing at 27.5 and 36.3°corresponding to the (111) and (101) planes reveals the presence of trace amount of the tetragonal crystal system of rutile TiO 2 . 24 Since there is a surface modification in NiTiO 3 by palladium and platinum, therefore, we observe that structural changes and these structural characteristics may be owing to the fact that palladium and platinum precursors PdCl 2 and PtCl 2 are reduced to metallic nanoparticle in the presence of already formed NiTiO 3 .…”

Section: Yield and Fe Calculationmentioning

confidence: 82%

Enhanced Nitrogen Reduction to Ammonia by Surface- and Defect-Engineered Co-catalyst-Modified Perovskite Catalysts under Ambient Conditions and Their Charge Carrier Dynamics

Bastia

Moses

Kumar

et al. 2023

ACS Appl. Mater. Interfaces

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An electrocatalytic nitrogen reduction reaction is considered a potential approach for green ammonia productiona zero-carbon fertilizer, fuel, and energy storage for renewable energy. To harness the synergistic properties of perovskites, the inherent dipole moment due to their non-centrosymmetric structure (that facilitates better charge separation), oxygen vacancies, and the presence of Ni metal sites that permit activation and reduction of N2 efficiently, the NiTiO3-based nanoelectrocatalysts have been synthesized. Further, these catalysts have been modified with ultra-small metal nanocrystal co-catalysts to form heterointerfaces that not only aid to improve the charge separation but also activate N2 and lower overpotential requirements. The appearance of peaks corresponding to (012), (104), (110), (11–3), (024), (11–6), (018), (027), and (300) confirms the formation of rhombohedral NiTiO3. The shift in the XRD peak corresponding to the (104) plane to a smaller 2θ value and peak shifting and widening of Raman spectra imply the lattice distortion that signifies the formation of Pd–NiTiO3 and Pt–NiTiO3 heterojunction electrocatalysts with the loadings of 0.4 and 0.3 wt % of Pd and Pt, respectively, as confirmed by ICP-OES analysis. The detailed XPS analysis reveals the presence of Pd (0), Pd (II), and Pt (0), Pt (II) in respective electrocatalysts. The appearance of XPS peaks at 528.7 and 531.1 eV suggests the presence of oxidative oxygen species (O2–/O–) and the presence of oxygen defects due to oxygen vacancy. The detailed nitrogen reduction (NRR) investigation exhibits a 5-fold enhancement in ammonia yield rate (∼14.28 μg h–1 mg–1 at −0.003 V vs RHE), a faradic efficiency of 27% (at 0.097 V vs RHE) for Pd–NiTiO3 electrocatalysts than that for bare NiTiO3 (3.08 μg h–1 mg–1), and 9-folds higher than that of the activity shown by the commercial TiO2 (P25) (1.52 μg h–1mg–1). The formation of ammonia was further confirmed by using isotopic nitrogen as the feeding gas. Furthermore, the highest NRR is observed at lower cathodic potential (−0.003 V vs RHE) in the case of the Pd–NiTiO3 electrocatalyst than that of the Pt–NiTiO3 electrocatalyst (−0.203 V vs RHE), implying significantly reduced overpotential requirement. Such enhanced NRR activity with lower overpotential requirement in the case of the Pd–NiTiO3 electrocatalyst is due to efficient charge separation as shown by the semicircle Nyquist plot, decreased photoluminescence emission intensity, shorter average lifetime (∼29 ns) of excitons, appropriate band bending, and improved activation of N2 by the oxygen vacancies and heterointerface formed between Pd nanocrystals and NiTiO3. Furthermore, no change is observed in the current density, after stabilization in the initial few seconds, even up to 2 h, which signifies that these electrocatalysts are stable. The structural and morphological integrity of the optimized catalyst remained even after the nitrogen reduction reactions, as revealed by no significant change observed in FESEM, elemental mapping, and EDS ana...

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Section: Yield and Fe Calculationmentioning

confidence: 82%

Enhanced Nitrogen Reduction to Ammonia by Surface- and Defect-Engineered Co-catalyst-Modified Perovskite Catalysts under Ambient Conditions and Their Charge Carrier Dynamics

Bastia

Moses

Kumar

et al. 2023

ACS Appl. Mater. Interfaces

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“…There are many methods for the preparation of CoTiO 3 or NiTiO 3 pigments, such as the solid-state reaction method [22,23], co-precipitation method [24,25], sol-gel method [26][27][28][29], thermal decomposition method [30], combustion method [31,32], etc. The traditional solid phase reaction method is easy to employ and does not introduce impurities, but the temperature required to synthesize pigments is high, generally exceeding 1000 • C, which often leads to severe sintering, increasing the particle size of the pigment and causing agglomeration [33,34]. Compared to the solid phase reaction method, the wet chemical method requires a lower reaction temperature but tends to introduce impurities, and the synthesized pigments are not homogeneous in particle size and also tend to agglomerate.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Chromaticity Control of CoTiO3/NiTiO3 Co-Coated TiO2 Composite Pigments

et al. 2022

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In this study, home-made amorphous TiO2 microspheres with good mono-dispersity and large numbers of mesopores on the surface were used as substrates. The intermediate microspheres were obtained by adding Co/Ni sources with different Co/Ni molar ratios in a water bath and making them react by water bath heating. By calcining the intermediate microspheres deposited on the TiO2 ones, a core–shell structured spherical CoTiO3/NiTiO3 inorganic composite pigment was prepared. The synthesized pigments were characterized by X-ray diffraction (XRD), Raman spectroscopy, field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectrometry (EDS), laser particle size (LPS) analysis and colorimetry. The results show that when the calcination temperature is 800 °C and the Co/Ni molar ratio is 0.5:0.5, the pigments consist of a TiO2 core and outer ilmenite CoTiO3/NiTiO3 shell. Moreover, the surface of the product microspheres is smooth, and the particles are of regular sphericity with a uniform particle size of about 1.8 μm. The colorimetric analysis from the samples calcined at 800 °C shows color changes from yellow-green to dark green as the Co/Ni molar ratio increases (0.1:0.9 to 0.9:0.1). A Co/Ni molar ratio that is too high or too low results in the formation of by-products such as Co3O4 or NiO, respectively, which adhere to the product surface and affect the chromaticity of the product. This work has enabled the chromatic modulation of yellow-green inorganic pigments, providing a solution for the preparation of spherical inorganic pigments that are more suitable for industrial inkjet printing.

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“…Perovskite-type oxides with ABO 3 structure and related materials constitute a group of compounds with a significant technological value because of their interesting physical and chemical properties [1][2][3][4][5][6][7][8]. Within this family of compounds, cobaltites, of general formula RECoO 3 (RE = rare earth like La, Nd, Gd, etc.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis, Microstructure, and Gas Sensing Properties of NdCoO₃ Nanoparticles

Gildo-Ortiz

Guillén-Bonilla

Reyes-Gómez

et al. 2017

Journal of Nanomaterials

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NdCoO 3 nanoparticles were successfully synthesized by a simple, inexpensive, and reproducible solution method for gas sensing applications. Cobalt nitrate, neodymium nitrate, and ethylenediamine were used as precursors and distilled water as solvent. The solvent was evaporated later by means of noncontinuous microwave radiation at 290 W. The obtained precursor powders were calcined at 200, 500, 600, and 700 ∘ C in a standard atmosphere. The oxide crystallized in an orthorhombic crystal system with space group Pnma (62) and cell parameters = 5.33Å, = 7.52Å, and = 5.34Å. The nanoparticles showed a diffusional growth to form a network-like structure and porous adsorption configuration. Pellets prepared from NdCoO 3 were tested as gas sensors in atmospheres of carbon monoxide and propane at different temperatures. The oxide nanoparticles were clearly sensitive to changes in gas concentrations (0-300 ppm). The sensitivity increased with increasing concentration of the gases and operating temperatures (25, 100, 200, and 300 ∘ C).

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Synthesis, Characterization, and NIR Reflectance of Highly Dispersed NiTiO₃and NiTiO₃/TiO₂Composite Pigments

Cited by 8 publications

References 15 publications

Enhanced Nitrogen Reduction to Ammonia by Surface- and Defect-Engineered Co-catalyst-Modified Perovskite Catalysts under Ambient Conditions and Their Charge Carrier Dynamics

Enhanced Nitrogen Reduction to Ammonia by Surface- and Defect-Engineered Co-catalyst-Modified Perovskite Catalysts under Ambient Conditions and Their Charge Carrier Dynamics

Preparation and Chromaticity Control of CoTiO3/NiTiO3 Co-Coated TiO2 Composite Pigments

Facile Synthesis, Microstructure, and Gas Sensing Properties of NdCoO₃ Nanoparticles

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Synthesis, Characterization, and NIR Reflectance of Highly Dispersed NiTiO3and NiTiO3/TiO2Composite Pigments

Cited by 8 publications

References 15 publications

Enhanced Nitrogen Reduction to Ammonia by Surface- and Defect-Engineered Co-catalyst-Modified Perovskite Catalysts under Ambient Conditions and Their Charge Carrier Dynamics

Enhanced Nitrogen Reduction to Ammonia by Surface- and Defect-Engineered Co-catalyst-Modified Perovskite Catalysts under Ambient Conditions and Their Charge Carrier Dynamics

Preparation and Chromaticity Control of CoTiO3/NiTiO3 Co-Coated TiO2 Composite Pigments

Facile Synthesis, Microstructure, and Gas Sensing Properties of NdCoO3 Nanoparticles

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Synthesis, Characterization, and NIR Reflectance of Highly Dispersed NiTiO₃and NiTiO₃/TiO₂Composite Pigments

Facile Synthesis, Microstructure, and Gas Sensing Properties of NdCoO₃ Nanoparticles