Structural and electrochemical investigations of nanostructured NiTiO3 in acidic environment

Chellasamy, V.; Thangadurai, P.

doi:10.1007/s11706-017-0380-1

Cited by 20 publications

(11 citation statements)

References 28 publications

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“…Figure 4 shows the Raman spectra of the pre-treated NiTiO3-300 °C and Au/NiTiO3-300 °C samples. As seen from the spectrum of the NiTiO3-300 °C, a series of Raman active modes located between 189 and 770 cm −1 are observed, confirming it has a rhombohedral crystalline structure as reported in previous studies [35,36]. The strongest Raman mode at 707 cm −1 arises from the symmetric stretching of the TiO6 octahedral of the NiTiO3 [37].…”

Section: The Effect Of Au-loading On the Activity Of Nitio3 Catalystssupporting

confidence: 86%

The Effect of Gold Nanoparticles on the Catalytic Activity of NiTiO3 for Hydrodeoxygenation of Guaiacol

et al. 2021

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Guaiacol is a typical model compound used to investigate and understand the hydrodeoxygenation behaviour of bio-oils, which is critical to their application as an alternative to fossil resources. While extensive research has been carried out on developing catalysts for guaiacol hydrodeoxygenation, the true active sites in these catalysts are often illusive. This study investigated the effect of Au-loading on the catalytic activity of NiTiO3 for the hydrodeoxygenation of guaiacol. It showed that metallic Ni formed by the partial reduction in NiTiO3 was responsible for its catalytic activity. Au-loading in NiTiO3 effectively reduces the temperature required for the NiTiO3 reduction from 400 °C to 300 °C. Consequently, at an Au-loading of 0.86 wt%, the 0.86 Au/NiTiO3-300 °C catalyst was found to deliver a guaiacol conversion of ~32%, more than 6 times higher than that of the pure NiTiO3-300 °C catalyst.

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Section: The Effect Of Au-loading On the Activity Of Nitio3 Catalystssupporting

confidence: 86%

The Effect of Gold Nanoparticles on the Catalytic Activity of NiTiO3 for Hydrodeoxygenation of Guaiacol

et al. 2021

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“…Figure 2 Furthermore, a prominent signal at 665 cm −1 confirms the metal titanate bond Ti−O−Ni. 26,27 The Raman analysis undertaken exhibits a prominent peak at 708 cm −1 in addition to other peaks corresponding to the octahedral TiO 6 symmetric stretching A 1g mode signal and validates the ilmenite structure of NiTiO 3 (Supporting Information Figure S2). Further, upon modification with Pd 2+ and Pt 2+ ions, the peak shifting and widening of Raman spectra take place, implying lattice distortion that signifies the formation of Pd−NiTiO 3 and Pt−NiTiO 3 heterojunction catalysts.…”

Section: Elucidation Ofsupporting

confidence: 63%

“…Figure shows that NiTiO 3 , Pd–NiTiO 3 , and Pt–NiTiO 3 have vibrational movement at the wavelengths of 668 and 562 cm –1 , respectively, attributable to the stretching vibrations of the Ni–O and Ti–O bonds. Furthermore, a prominent signal at 665 cm –1 confirms the metal titanate bond Ti–O–Ni. , …”

Section: Resultsmentioning

confidence: 92%

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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“…For the latter application, the absorption edge must be known. The UV-vis absorption spectrum of pure NiTiO 3 was already published by our research group elsewhere 11 however, for reference, that spectrum is given in Fig. S2 of the supplementary information along with its discussion.…”

Section: Resultsmentioning

confidence: 99%

Microwave Assisted Synthesis of Pt_xRu_1−x-NiTiO₃: A Novel Hybrid Nanostructured Electrocatalyst for Direct Methanol Oxidation

Chellasamy,

Thangadurai

2024

ECS Adv.

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We have explored the preparation of PtxRu1-x-NiTiO3 hybrid electrocatalysts for the application of methanol oxidization. The X-ray diffraction (XRD) and Raman analysis of PtxRu1-x-NiTiO3 confirmed the rhombohedral crystal structure of NiTiO3 and cubic-structured Pt(Ru) nanoparticles. Transmission electron microscopy (TEM) analysis signifies that Pt(Ru) nanoparticles is decorated on the surface of the NiTiO3. The mean size of the Pt(Ru) nanoparticles calculated from the TEM profile is around 2 nm which corroborates with crystallite size estimated from XRD. X-ray photoelectron spectroscopy analysis confirms the presence of metallic Pt along with its oxidized components (Pt2+ and Pt4+). The cyclic voltammetry analysis evidence that Pt0.5Ru0.5-NiTiO3 has shown better activity in methanol oxidation compared with the other compositions of PtxRu1-x-NiTiO3 along with the maximum current density of 65.41 mA/cm2 with less carbon poisoning. Chronoamperometry and polarization studies represent the stability and electrochemical activity of the Pt0.5Ru0.5-NiTiO3 electrocatalysts towards methanol oxidation. Based on the research carried out in this work, it is concluded that PtxRu1-x-NiTiO3 would be a promising candidate as an electrocatalyst for methanol oxidation in direct methanol fuel cells.

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Structural and electrochemical investigations of nanostructured NiTiO3 in acidic environment

Cited by 20 publications

References 28 publications

The Effect of Gold Nanoparticles on the Catalytic Activity of NiTiO3 for Hydrodeoxygenation of Guaiacol

The Effect of Gold Nanoparticles on the Catalytic Activity of NiTiO3 for Hydrodeoxygenation of Guaiacol

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

Microwave Assisted Synthesis of Pt_xRu_1−x-NiTiO₃: A Novel Hybrid Nanostructured Electrocatalyst for Direct Methanol Oxidation

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Structural and electrochemical investigations of nanostructured NiTiO3 in acidic environment

Cited by 20 publications

References 28 publications

The Effect of Gold Nanoparticles on the Catalytic Activity of NiTiO3 for Hydrodeoxygenation of Guaiacol

The Effect of Gold Nanoparticles on the Catalytic Activity of NiTiO3 for Hydrodeoxygenation of Guaiacol

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

Microwave Assisted Synthesis of PtxRu1−x-NiTiO3: A Novel Hybrid Nanostructured Electrocatalyst for Direct Methanol Oxidation

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Microwave Assisted Synthesis of Pt_xRu_1−x-NiTiO₃: A Novel Hybrid Nanostructured Electrocatalyst for Direct Methanol Oxidation