In situ surface monitoring of energy materials during processing: impact of defect disorder on surface versus bulk semiconducting properties of photocatalytic hematite (Fe2O3)

Bak, T.; StC. Black, D.; Gannon, P.; Gür, T. M.; Jasiuk, I.; Sherif, S. A.; Sigmund, W. M.; Nowotny, J.

doi:10.1039/d3ya00482a

Energy Adv.

2024

DOI: 10.1039/d3ya00482a

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In situ surface monitoring of energy materials during processing: impact of defect disorder on surface versus bulk semiconducting properties of photocatalytic hematite (Fe₂O₃)

T. Bak,

D. StC. Black,

P. Gannon

et al.

Abstract: Rational design of surface properties of oxide semiconductors for energy conversion requires in-situ surface characterization. This work considers in-situ monitoring of surface semiconducting properties of hematite (Fe2O3) during isothermal oxidation...

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2024

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Cited by 3 publications

References 37 publications

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Enhanced sinterability and conductivity insights of Nb2O5 - Doped 8 mol% yttria-stabilized zirconia: Implications for low-temperature ceramic electrolytes

Momin,

Manjanna,

Kobayashi

et al. 2024

Ceramics International

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Enhanced sinterability and conductivity insights of Nb2O5 - Doped 8 mol% yttria-stabilized zirconia: Implications for low-temperature ceramic electrolytes

Momin,

Manjanna,

Kobayashi

et al. 2024

Ceramics International

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Defect Chemistry of Titanium Dioxide (Rutile). Progress Toward Sustainable Energy

Bak,

Sherif,

Black

et al. 2024

Chem. Rev.

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This work, which overviews defect chemistry of TiO 2 (rutile), is focused on atomicsize structural defects that are thermodynamically reversible. Here it is shown that thermodynamics can be used in defect engineering of TiO 2 -based energy materials, such as photoelectrodes and photocatalysts. We show that surface segregation of defects leads to the building-up of new surface structures that are responsible for reactivity. Since rational design of surface properties requires in situ surface characterization in operational conditions, expansion of bulk defect chemistry to surface defect chemistry requires a defect-related surface-sensitive tool for in situ monitoring of defectrelated properties at elevated temperatures corresponding to defect equilibria and in a controlled gas-phase environment. Here we show that the high-temperature electron probe is a defect-related surface-sensitive tool that is uniquely positioned to aid surface defect engineering and determine unequivocal surface properties. The related applied aspects are considered for photoelectrochemical water splitting and the performance of solid oxide fuel cells. Here we report that trail-blazing studies on in situ surface monitoring of TiO 2 during gas/solid equilibration, along with in situ characterization of surface semiconducting properties, leads to the discovery of a segregation-induced low-dimensional surface structure that is responsible for stable performance of oxide semiconductors, such as TiO 2 , in operational conditions.

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Effects of atomic vibrations on the electronic structure and the photocatalytic efficiency of α-Fe2O3

Luo,

Lyu

2024

Phys. Rev. B

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In situ surface monitoring of energy materials during processing: impact of defect disorder on surface versus bulk semiconducting properties of photocatalytic hematite (Fe₂O₃)

Abstract: Rational design of surface properties of oxide semiconductors for energy conversion requires in-situ surface characterization. This work considers in-situ monitoring of surface semiconducting properties of hematite (Fe2O3) during isothermal oxidation...

Cited by 3 publications

References 37 publications

Enhanced sinterability and conductivity insights of Nb2O5 - Doped 8 mol% yttria-stabilized zirconia: Implications for low-temperature ceramic electrolytes

Enhanced sinterability and conductivity insights of Nb2O5 - Doped 8 mol% yttria-stabilized zirconia: Implications for low-temperature ceramic electrolytes

Defect Chemistry of Titanium Dioxide (Rutile). Progress Toward Sustainable Energy

Effects of atomic vibrations on the electronic structure and the photocatalytic efficiency of α-Fe2O3

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