Electrical Conductivity and Catalytic Activity of Zinc Oxide.

Heckelsberg, Louis F.; Calrk, Alfred; Bailey, G. C.

doi:10.1021/j150539a011

Cited by 27 publications

(10 citation statements)

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“…Figure 3(a) indicates that the ion conductivities at 400 °C increase with the oxygen partial pressure (∂σ/∂P O2 > 0) for all samples, which is a characteristic of p-type semiconductor according to the Heckelsberg criterion. 58 More interestingly, the ion conductivities obey the sequence of Bi 2 Zr 2 O 7 > Bi 2 Ti 2 O 7 > Bi 2 Sn 2 O 7 , which matches the lattice disorder degrees and soot oxidation performance of the samples. As depicted in Figure 3(b), the ion conductivities nearly parallel the lattice disorder degrees of the catalysts.…”

Section: Resultsmentioning

confidence: 56%

Unraveling the Principles of Lattice Disorder Degree of Bi₂B₂O₇ (B = Sn, Ti, Zr) Compounds on Activating Gas Phase O₂ for Soot Combustion

Feng

et al. 2021

ACS Catal.

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With the combination of experimental methods and DFT calculations, the influence of lattice disorder degree on the catalytic property of Bi2B2O7 compounds with different B-site cations (B = Sn, Ti, Zr) has been elucidated in this work. The crystal structures of the samples vary from a well-ordered pyrochlore (Bi2Sn2O7) to a less-ordered pyrochlore (Bi2Ti2O7), and eventually to a disordered defect fluorite (Bi2Zr2O7) phase, hence the lattice disorder degree increases. DFT calculation and oxygen ion conductivity results have testified that the surface oxygen vacancy formation energies (E O‑f) of the catalysts decrease with the increase of the disorder degree, accompanying the improvement of the lattice ion mobility and the formation of more surface oxygen vacancies. Isotopic 18O2 tracing experiments have demonstrated that the adsorbing and activating of gas phase O2 molecules mainly follow an R2 mechanism requiring two adjacent surface vacancies. With the synergistic actions of surface oxygen vacancies and lattice O2– anions, both active O2 – and O2 2– sites contributing vitally to soot combustion can be formed. Therefore, the abundance of surface oxygen vacancies is of great importance for this process, which is intimately related to the lattice disorder degree of the compounds. From this point of view, it is concluded that the lattice disorder degree is the inherent factor to determine the redox property and reaction performance of Bi2B2O7 compounds for soot combustion.

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Section: Resultsmentioning

confidence: 56%

Unraveling the Principles of Lattice Disorder Degree of Bi₂B₂O₇ (B = Sn, Ti, Zr) Compounds on Activating Gas Phase O₂ for Soot Combustion

Feng

et al. 2021

ACS Catal.

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“…The electrical conductivities of the catalysts have been measured as a function of temperature to determine the activation energy of conduction E c under air, nitrogen and isobutane at atmospheric pressure. At the same time, applying the Heckelsberg criterion [15], the nature of the semiconductor type of the solid can be determined. To ensure the reversibility of the experiments, the measurements were performed with increasing and decreasing temperature.…”

Section: Resultsmentioning

confidence: 99%

Semiconductive properties of Mo–V–M–O (M = Zn, Ni, Cu, Sb) oxides, catalysts for isobutane oxidehydrogenation

Mitran

Urdă

Săndulescu

et al. 2009

Reac Kinet Mech Cat

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Electrical conductivity measurements have been performed on Mo-V-M-O (M = Zn, Ni, Cu, Sb) mixed oxides as a function of temperature under air, nitrogen and isobutane. MoO 3 , V 2 O 5 , Mo-V-O and Mo-V-Zn-O oxides were found to be n-type semiconductors, while Mo-V-Ni-O, Mo-V-Cu-O and Mo-V-Sb-O oxides were found to be p-type semiconductors. The electrical conductivity data were correlated with the catalytic properties in the oxidehydrogenation of isobutane and mechanisms for isobutane transformation over n-type and p-type semiconductors, respectively, were proposed.

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“…Previous studies have shown that tubes with thicker walls are more conductive than those of thinner ones [18]. The second possible reason can be related to the presence of zinc oxide, which has high electrical resistance, resulting in a decrease in the electrical conductivity of the nanotube arrays [36]. The EIS results of Sr-doped nanotube arrays showed lower impedance than that of Zn-doped TiO 2 arrays (1.7 KΩ), but they are still less conductive than the pure nanotubes.…”

Section: Electrochemical Performance Of the Fabricated Nanotube Arraysmentioning

confidence: 99%

Investigation of Effects of Copper, Zinc, and Strontium Doping on Electrochemical Properties of Titania Nanotube Arrays for Neural Interface Applications

et al. 2021

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Direct interaction with the neuronal cells is a prerequisite to deciphering useful information in understanding the underlying causes of diseases and functional abnormalities in the brain. Precisely fabricated nanoelectrodes provide the capability to interact with the brain in its natural habitat without compromising its functional integrity. Yet, challenges exist in terms of the high cost and complexity of fabrication as well as poor control over the chemical composition and geometries at the nanoscale, all imposed by inherent limitations of current micro/nanofabrication techniques. In this work, we report on electrochemical fabrication and optimization of vertically oriented TiO2 nanotube arrays as nanoelectrodes for neural interface application. The effects of zinc, strontium, and copper doping on the structural, electrochemical, and biocompatibility properties of electrochemically anodized TiO2 nanotube arrays were investigated. It was found that doping can alter the geometric features, i.e., the length, diameter, and wall thickness, of the nanotubes. Among pure and doped samples, the 0.02 M copper-doped TiO2 nanotubes exhibited superior electrochemical properties, with the highest specific storage capacitance of 130 F g−1 and the lowest impedance of 0.295 KΩ. In addition, regeneration of Vero cells and neurons was highly promoted on (0.02 M) Cu-doped TiO2 nanotube arrays, with relatively small tube diameters and more hydrophilicity, compared with the other two types of dopants. Our results suggest that in situ doping is a promising method for the optimization of various structural and compositional properties of electrochemically anodized nanotube arrays and improvement of their functionality as a potential nanoelectrode platform for neural interfacing.

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Electrical Conductivity and Catalytic Activity of Zinc Oxide.

Cited by 27 publications

References 0 publications

Unraveling the Principles of Lattice Disorder Degree of Bi₂B₂O₇ (B = Sn, Ti, Zr) Compounds on Activating Gas Phase O₂ for Soot Combustion

Unraveling the Principles of Lattice Disorder Degree of Bi₂B₂O₇ (B = Sn, Ti, Zr) Compounds on Activating Gas Phase O₂ for Soot Combustion

Semiconductive properties of Mo–V–M–O (M = Zn, Ni, Cu, Sb) oxides, catalysts for isobutane oxidehydrogenation

Investigation of Effects of Copper, Zinc, and Strontium Doping on Electrochemical Properties of Titania Nanotube Arrays for Neural Interface Applications

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Electrical Conductivity and Catalytic Activity of Zinc Oxide.

Cited by 27 publications

References 0 publications

Unraveling the Principles of Lattice Disorder Degree of Bi2B2O7 (B = Sn, Ti, Zr) Compounds on Activating Gas Phase O2 for Soot Combustion

Unraveling the Principles of Lattice Disorder Degree of Bi2B2O7 (B = Sn, Ti, Zr) Compounds on Activating Gas Phase O2 for Soot Combustion

Semiconductive properties of Mo–V–M–O (M = Zn, Ni, Cu, Sb) oxides, catalysts for isobutane oxidehydrogenation

Investigation of Effects of Copper, Zinc, and Strontium Doping on Electrochemical Properties of Titania Nanotube Arrays for Neural Interface Applications

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Unraveling the Principles of Lattice Disorder Degree of Bi₂B₂O₇ (B = Sn, Ti, Zr) Compounds on Activating Gas Phase O₂ for Soot Combustion

Unraveling the Principles of Lattice Disorder Degree of Bi₂B₂O₇ (B = Sn, Ti, Zr) Compounds on Activating Gas Phase O₂ for Soot Combustion