Defect Engineering of Photosensitive Oxide Materials. Example of TiO2 Solid Solutions

Atanacio, Armand J.; Бак, Т.; Rahman, Kazi A.; Nowotny, Janusz

doi:10.1016/bs.adioch.2018.05.006

Cited by 7 publications

(7 citation statements)

References 46 publications

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“…The segregation-induced surface enrichment is profoundly influenced by oxygen activity in the gas phase. 22,41,42 Therefore, imposition of variable oxygen activity results in a shift of defect equilibria within the surface layer. 3.…”

Section: Surface Defect Engineering Of Metalmentioning

confidence: 99%

“…Controlled defect disorder within the surface layer may be achieved by the formation of solid solutions of the host oxide material with extrinsic ions and subsequent surface monitoring during the resulting surface reactions induced by segregation. The segregation-induced surface enrichment is profoundly influenced by oxygen activity in the gas phase. ,, Therefore, imposition of variable oxygen activity results in a shift of defect equilibria within the surface layer. Implantation and subsequent annealing . Ion implantation allows physical deposition of a specific amount of extrinsic species at controlled depth.…”

Section: Surface Defect Engineering Of Metal Oxidesmentioning

confidence: 99%

“…The TiO 2 -based systems (TBSs) are promising candidates for a new generation of solar materials. ,, Their advantages over valence semiconductors are abundance in nature, low cost, and outstanding resistance to corrosion in water. Therefore, the TBSs have the ability to harvest solar energy while immersed in water.…”

Section: Emerging Initiatives In Materials For Sustainable Energy Exa...mentioning

confidence: 99%

“…It has been shown that segregation in metal oxides is profoundly affected by oxygen activity in the surrounding gas phase. 22 Moreover, when the segregationinduced concentration exceeds a certain critical value, the surface layer undergoes a structural transition leading to the formation of a quasi-isolated surface structure (QISS), which has a strong impact on surface properties, such as reactivity. 23−25 1.4.…”

Section: Introductionmentioning

confidence: 99%

“…Considering the crystal lattice as a solid solution of intrinsic and extrinsic defects, the enthalpy of segregationassociated with the exchange of solute species in the bulk phase and the solvent species at the surfacehas a complex physical meaning. It has been shown that segregation in metal oxides is profoundly affected by oxygen activity in the surrounding gas phase . Moreover, when the segregation-induced concentration exceeds a certain critical value, the surface layer undergoes a structural transition leading to the formation of a quasi-isolated surface structure (QISS), which has a strong impact on surface properties, such as reactivity. − …”

Section: Introductionmentioning

confidence: 99%

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Electron Probe for Surface Science and Surface Defect Engineering of Oxide Semiconductors for Sustainable Energy Conversion

Nowotny

Бак

2020

J. Phys. Chem. C

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This work provides a summary of progress in emerging areas of the science of materials interfaces and interface engineering of energy materials. The progress, which is focused on gas–solid reactivity of oxide materials, indicates that the high-temperature electron probe (HTEP) offers new insight into the local-defect-related properties of the surface layer that are critical for understanding the reactivity of solids and the related charge transfer. The probe enables unequivocal surface characterization of energy materials in gas–solid equilibrium and in situ surface monitoring during processing and performance at elevated temperatures. Specific progress has been achieved in understanding the impact of both chemisorption and surface segregation on the formation of quasi-isolated surface structures (QISSs) that play a crucial role in gas–solid reactivity. The key feature of the HTEP is the ability to measure work function (WF), which is the defect-related surface property, while the surface layer is in thermodynamic equilibrium with the gas phase on one side and the bulk phase on the other. The summary indicates that the progress in energy materials requires recognition that surface properties are determined by structural defects within the surface layer. The probe, which has a wide range of applications in materials engineering, ceramics, catalysis, chemical engineering, metallurgy, nuclear fusion, and high-temperature materials, opens up new areas of the science of materials interfaces and interface engineering. The latter is of critical importance in the development of materials for environmentally friendly energy conversion.

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Section: Surface Defect Engineering Of Metalmentioning

confidence: 99%

Section: Surface Defect Engineering Of Metal Oxidesmentioning

confidence: 99%

Section: Emerging Initiatives In Materials For Sustainable Energy Exa...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Electron Probe for Surface Science and Surface Defect Engineering of Oxide Semiconductors for Sustainable Energy Conversion

Nowotny

Бак

2020

J. Phys. Chem. C

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Solution mixing preparation of PVDF/ZnO polymeric composite films engineered for heterogeneous photocatalysis

Zanrosso

Piazza

Lansarin

2019

J of Applied Polymer Sci

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Despite the efforts of the scientific community, carrying out photocatalyst immobilization so that industrial application of photocatalysis becomes economically feasible is still a challenge to be overcome. In this work, polyvinylidene fluoride (PVDF)/ZnO composites were prepared by solution mixing based on solid knowledge of membrane technology and with the help of a powerful experimental design for systematic evaluation of the interaction among variables. A strategy for variable screening was used, followed by a complete evaluation at two levels, leading to predictive models. As a result, photocatalyst amount, pore agent concentration, and wet thickness were the most significant in the target molecule discoloration. With this, it was possible to obtain a 40 and 186% enhancement in photocatalytic efficiency compared to previous results and simple photolysis, respectively. Finally, the samples were characterized by FTIR‐ATR, XRD, and SEM and chemical, crystalline and morphological differences were observed both with nanoparticle and pore agent incorporation. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48417.

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Latest developments on TiO2-based photocatalysis: a special focus on selectivity and hollowness for enhanced photonic efficiency

Ferreira

Rocco

Silva

et al. 2021

Applied Catalysis A: General

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Defect Engineering of Photosensitive Oxide Materials. Example of TiO2 Solid Solutions

Cited by 7 publications

References 46 publications

Electron Probe for Surface Science and Surface Defect Engineering of Oxide Semiconductors for Sustainable Energy Conversion

Electron Probe for Surface Science and Surface Defect Engineering of Oxide Semiconductors for Sustainable Energy Conversion

Solution mixing preparation of PVDF/ZnO polymeric composite films engineered for heterogeneous photocatalysis

Latest developments on TiO2-based photocatalysis: a special focus on selectivity and hollowness for enhanced photonic efficiency

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