Probing the dominance of interstitial oxygen defects in ZnO nanoparticles through structural and optical characterizations

Sahai, Anshuman; Goswami, Navendu

doi:10.1016/j.ceramint.2014.06.041

Cited by 114 publications

(41 citation statements)

References 36 publications

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“…Since SFM has a layer structure, which consists of a perovskite layer and a rock salt layer, the oxygen vacancies and interstitial oxygen (O i , 23.12%) ions can coexist in the SFM lattice, which are accommodated on octahedral sites and tetrahedral interstitial sites, respectively [45,46]. Based on this information, the high-energy peak is assigned to interstitial oxygen ions (O i ) [47,48], which can be interpreted as the formation of an anion Frenkel-type defect on the oxygen sublattice as follows:…”

Section: Resultsmentioning

confidence: 99%

Efficient reversible CO/CO2 conversion in solid oxide cells with a phase-transformed fuel electrode

Singh

Zhuang

et al. 2020

Sci. China Mater.

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The reversible solid oxide cell (RSOC) is an attractive technology to mutually convert power and chemicals at elevated temperatures. However, its development has been hindered mainly due to the absence of a highly active and durable fuel electrode. Here, we report a phase-transformed CoFe-Sr 3 Fe 1.25 Mo 0.75 O 7−δ (CoFe-SFM) fuel electrode consisting of CoFe nanoparticles and Ruddlesden-Popper-layered Sr 3 Fe 1.25 Mo 0.75 O 7−δ (SFM) from a Sr 2 Fe 7/6 Mo 0.5 Co 1/3 O 6−δ (SFMCo) perovskite oxide after annealing in hydrogen and apply it to reversible CO/CO 2 conversion in RSOC. The CoFe-SFM fuel electrode shows improved catalytic activity by accelerating oxygen diffusion and surface kinetics towards the CO/CO 2 conversion as demonstrated by the distribution of relaxation time (DRT) study and equivalent circuit model fitting analysis. Furthermore, an electrolyte-supported single cell is evaluated in the 2:1 CO-CO 2 atmosphere at 800°C, which shows a peak power density of 259 mW cm −2 for CO oxidation and a current density of −0.453 A cm −2 at 1.3 V for CO 2 reduction, which correspond to 3.079 and 3.155 mL min −1 cm −2 for the CO and CO 2 conversion rates, respectively. More importantly, the reversible conversion is successfully demonstrated over 20 cyclic electrolysis and fuel cell switching test modes at 1.3 and 0.6 V. This work provides a useful guideline for designing a fuel electrode through a surface/interface exsolution process for RSOC towards efficient CO-CO 2 reversible conversion.

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Section: Resultsmentioning

confidence: 99%

Efficient reversible CO/CO2 conversion in solid oxide cells with a phase-transformed fuel electrode

Singh

Zhuang

et al. 2020

Sci. China Mater.

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“…XPS provides chemical bonding information of an atom based on the shift of its binding energies . It has been reported that the binding energies of O 1s for lattice oxygen, nonlattice oxygen (surface oxygen), oxygen vacancies, and oxygen interstitials are different, where the interstitial oxygen has the highest binding energy, followed by the oxygen vacancy, the nonlattice oxygen, and the lattice oxygen . Therefore, XPS can be applied to differentiate oxygen atoms found in different environments.…”

Section: Resultsmentioning

confidence: 99%

Defect‐Mediated Anisotropic Lattice Expansion in Ceramics as Evidence for Nonthermal Coupling between Electromagnetic Fields and Matter

et al. 2019

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Electromagnetic (EM) fields can trigger a range of surprising responses in materials. Microwave radiation (MWR), a type of EM field in the frequency range of 0.3–300 GHz, can lower the synthesis temperature required for ceramics such as TiO2 and induces mixed amorphous–crystalline phase compositions. To better understand the effects of MWR on matter, structural changes during microwave heating and MWR‐assisted synthesis using in situ synchrotron X‐ray diffraction are studied. Anisotropic expansion–contraction of lattice parameters under microwave‐radiation is observed, which contradicts the results from conventional thermal heating. When as‐received TiO2 powders are heated with MWR, an instantaneous decrease in the intensities of diffraction peaks indicates decrystallization/amorphization. High‐resolution electron microscopy supports these observations. Raman spectroscopy and X‐ray photoemission spectroscopy indicate increased defect‐generation under microwave exposure. Molecular dynamics simulations on the anatase phase of TiO2 suggests that introducing an oxygen vacancy can lead to the formation of an interstitial–vacancy pair resulting in anisotropic expansion–contraction of the lattice. These unique responses of ceramics under externally applied fields provide direct evidence for nonthermal coupling between EM fields and matter. Understanding such nonthermal, field‐driven processes has implications in engineering low‐temperature processes for integrating ceramics with polymers for flexible electronics, energy harnessing, and storage applications.

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“…66 Further, A 1 and E 1 modes split into longitudinal optical (LO) and transfers optical (TO). 67 The Raman spectrum of N-ZnONCBs catalyst exhibited several peaks, wherein the wurtzite phase of N-ZnONCBs catalyst appeared as a less sharp peak at 494 cm À1 due to E 2H vibration mode of the Zn-O bond as shown in Fig. 4(A).…”

Section: Raman Characterizationmentioning

confidence: 94%

Synthesis of N-doped ZnO nanoparticles with cabbage morphology as a catalyst for the efficient photocatalytic degradation of methylene blue under UV and visible light

2019

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Probing the dominance of interstitial oxygen defects in ZnO nanoparticles through structural and optical characterizations

Cited by 114 publications

References 36 publications

Efficient reversible CO/CO2 conversion in solid oxide cells with a phase-transformed fuel electrode

Efficient reversible CO/CO2 conversion in solid oxide cells with a phase-transformed fuel electrode

Defect‐Mediated Anisotropic Lattice Expansion in Ceramics as Evidence for Nonthermal Coupling between Electromagnetic Fields and Matter

Synthesis of N-doped ZnO nanoparticles with cabbage morphology as a catalyst for the efficient photocatalytic degradation of methylene blue under UV and visible light

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