Effects of Ultraviolet Illumination on Oxygen Interstitial Injection from TiO<sub>2</sub> under Liquid Water

Jeong, Heonjae; Seebauer, Edmund G.

doi:10.1021/acs.jpcc.2c05648

Cited by 3 publications

(1 citation statement)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In a binary oxide, rutile TiO 2 , the oxygen incorporation rate under water was improved by UV light illumination, compared to red light and dark condition. 52 The extra charges are only generated by super band gap illumination (like UV light) which possess a higher energy overcoming the band gap of rutile TiO 2 (3.1 eV). In LTO, absorption of infrared light was highly sensitive to intercalation of Li in the LTO lattice, in contrast to that of visible light.…”

Section: Computational Results and Discussionmentioning

confidence: 99%

Fast-Charging Li₄Ti₅O₁₂ Anode Driven by Light

Ma,

Shen,

Jeong

et al. 2024

J. Electrochem. Soc.

Self Cite

View full text Add to dashboard Cite

Lithium-ion batteries with fast charging capabilities are crucial for widespread adoption of electric vehicles, as they will increase acceptance of the technology and reduce range anxiety for drivers. To achieve this, advanced fast-charging technologies and alternative methods to enhance the slow electrochemical processes are desperately required. This study applied light-emitting diode (LED) photo-assisted fast charging to Li4Ti5O12 (LTO), a large bandgap cubic spinel material, to enhance charging speed through electronic-structure coupling. UV LED-generated light irradiation on to the electrode interface boosted the ion diffusion and lithium cation addition by a factor of 1.3 during electrochemical lithiation, resulting in a 30% decrease in charging time under ambient conditions. Red LED light was not effective in accelerating the reaction as it does not provide sufficient energy. The first-principles calculations support the concept that UV illumination generates charges by overcoming the material's bandgap and effectively reducing it through the introduction of additional titanium defect states.

show abstract

Section: Computational Results and Discussionmentioning

confidence: 99%

Fast-Charging Li₄Ti₅O₁₂ Anode Driven by Light

Ma,

Shen,

Jeong

et al. 2024

J. Electrochem. Soc.

Self Cite

View full text Add to dashboard Cite

show abstract

Influence of interstitial cluster families on post-synthesis defect manipulation and purification of oxides using submerged surfaces

Jeong,

Seebauer

2024

The Journal of Chemical Physics

View full text Add to dashboard Cite

Injection of interstitial atoms by specially prepared surfaces submerged in liquid water near room temperature offers an attractive approach for post-synthesis defect manipulation and isotopic purification in device structures. However, this approach can be limited by trapping reactions that form small defect clusters. The compositions and dissociation barriers of such clusters remain mostly unknown. This communication seeks to address this gap by measuring the dissociation energies of oxygen interstitial traps in rutile TiO2 and wurtzite ZnO exposed to liquid water. Isotopic self-diffusion measurements using 18O, combined with progressive annealing protocols, suggest the traps are small interstitial clusters with dissociation energies ranging from 1.3 to 1.9 eV. These clusters may comprise a family incorporating various numbers, compositions, and configurations of O and H atoms; however, in TiO2, native interstitial clusters left over from initial synthesis may also play a role. Families of small clusters are probably common in semiconducting oxides and have several consequences for post-synthesis defect manipulation and purification of semiconductors using submerged surfaces.

show abstract

Effects of adventitious impurity adsorption on oxygen interstitial injection rates from submerged TiO2(110) and ZnO(0001) surfaces

Jeong

Seebauer

2023

Journal of Vacuum Science &Amp; Technology A

View full text Add to dashboard Cite

Low bond coordination of surface atoms facilitates the injection of oxygen interstitial atoms into the bulk near room temperature from the clean surfaces of semiconducting metal oxides when exposed to liquid water, opening new prospects for postsynthesis defect engineering and isotopic fractionation. The injection rate and penetration depth vary considerably under identical experimental conditions, however, with the adsorption of adventitious carbon suggested as the cause. For water-submerged rutile TiO2(110) and wurtzite ZnO(0001), this work bolsters and refines that hypothesis by combining the isotopic self-diffusion measurements of oxygen with characterization by x-ray photoelectron spectroscopy and atomic force microscopy. Adventitious carbon likely diminishes injection rates by poisoning small concentrations of exceptionally active surface sites that either inject O or dissociate adsorbed OH to injectable O. These effects propagate into the penetration depth via the progressive saturation of Oi traps near the surface, which occurs less extensively as the injected flux decreases.

show abstract

Effects of Ultraviolet Illumination on Oxygen Interstitial Injection from TiO₂ under Liquid Water

Cited by 3 publications

References 43 publications

Fast-Charging Li₄Ti₅O₁₂ Anode Driven by Light

Fast-Charging Li₄Ti₅O₁₂ Anode Driven by Light

Influence of interstitial cluster families on post-synthesis defect manipulation and purification of oxides using submerged surfaces

Effects of adventitious impurity adsorption on oxygen interstitial injection rates from submerged TiO2(110) and ZnO(0001) surfaces

Contact Info

Product

Resources

About

Effects of Ultraviolet Illumination on Oxygen Interstitial Injection from TiO2 under Liquid Water

Cited by 3 publications

References 43 publications

Fast-Charging Li4Ti5O12 Anode Driven by Light

Fast-Charging Li4Ti5O12 Anode Driven by Light

Influence of interstitial cluster families on post-synthesis defect manipulation and purification of oxides using submerged surfaces

Effects of adventitious impurity adsorption on oxygen interstitial injection rates from submerged TiO2(110) and ZnO(0001) surfaces

Contact Info

Product

Resources

About

Effects of Ultraviolet Illumination on Oxygen Interstitial Injection from TiO₂ under Liquid Water

Fast-Charging Li₄Ti₅O₁₂ Anode Driven by Light

Fast-Charging Li₄Ti₅O₁₂ Anode Driven by Light