LaTiO<sub>2</sub>N nanopowders (NPs) with low surface defect density <i>via</i> nitridation of flame made NPs retaining simple perovskite structure

Abe, Yoshiyuki; Laine, Richard M.

doi:10.1039/d1dt03687d

Cited by 3 publications

(1 citation statement)

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“…Previous studies have suggested that the defects play a pivotal role in governing the photocatalytic performance of LaTiO 2 N. − ,− The types of defects in LaTiO 2 N, their locations, energy states, concentrations, etc., correlate intrinsically with the behavior of photocarriers (e – and h + ). For instance, a variety of crystal defects have been identified in conventionally prepared LaTiO 2 N, including stacking faults, coherent low-angle domain boundaries, oxygen-rich planes, twin domains, grain boundaries, surface reconstruction layers, ,, various point defects [e.g., Ti 3+ , oxygen vacancies (V O ), nitrogen vacancies (V N ), and oxygen at nitrogen sites (O N )], ,,,− etc. These defects, particularly when they are located in the bulk, are detrimental to photocatalytic activity as they can retard the movement of photocarriers and trigger unproductive photocarrier recombination .…”

Section: Introductionmentioning

confidence: 99%

Single-Crystalline LaTiO₂N Nanosheets with Regulated Defects for Photocatalytic Overall Water Splitting under Visible Light up to 600 nm

Yu,

Shi,

et al. 2023

ACS Catal.

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Overall water splitting (OWS), liberating H 2 and O 2 in a 2:1 ratio, based on powdery photocatalysts, represents a simple and cost-effective means for solar hydrogen production. For an efficient solar energy harvest, the use of OWS reactions should be operated using narrow-band gap semiconductors, which remains a great challenge. In this work, photocatalytic OWS reactions, operable up to 600 nm, have been achieved over a narrow-band gap semiconductor LaTiO 2 N with single-crystalline nanosheet morphology. These nanosheets, prepared via a topotactic route, are of a low concentration of Ti 3+ defects whose locations are limited to the top surface of ∼1 nm thickness. Such a regulated Ti 3+ distribution is essential for OWS reactions as it enables the accumulation of both photogenerated electrons and holes at the surface region simultaneously. Compared with conventional inactive LaTiO 2 N, LaTiO 2 N single-crystalline nanosheets can stably photocatalyze OWS reactions under visible light and simulated AM1.5G after being deposited with the RhCrO y cocatalyst and coated with a Ti oxyhydroxide layer. These findings provide a rational guideline to open up the OWS activity of narrow-band gap semiconductors by proper defect regulation.

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Section: Introductionmentioning

confidence: 99%

Single-Crystalline LaTiO₂N Nanosheets with Regulated Defects for Photocatalytic Overall Water Splitting under Visible Light up to 600 nm

Yu,

Shi,

et al. 2023

ACS Catal.

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Unleashing Photocarrier Transport in Mesoporous Single‐Crystalline LaTiO₂N for High‐Efficiency Photocatalytic Water Splitting

Wang,

He,

Shi

et al. 2023

Advanced Energy Materials

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LaTiO2N is a promising narrow‐bandgap semiconductor photocatalyst that shows great promise for water redox reactions. However, its performance is often hindered by fast photocarrier recombination events. Herein, LaTiO2N mesoporous single crystals (MSCs) are successfully fabricated via a topotactic conversion route by using the Ruddlesden–Popper compound NaLaTiO4 as the precursor. The LaTiO2N MSCs are characterized by high crystallinity, abundant mesopores, no grain boundaries (GBs), and exposure of (010) and (101) crystal facets. A facet‐assisted photocarrier separation mechanism is identified for these LaTiO2N MSCs which contributes to the much better photocarrier separation than conventional counterparts. By loading proper cocatalysts, LaTiO2N MSCs serve as an efficient photocatalyst for water‐splitting half‐reactions and are capable of photocatalyzing overall water‐splitting reactions, delivering an impressive apparent quantum efficiency (AQE) as high as 65.07% at 420 ± 20 nm for O2‐evolution and a solar‐to‐hydrogen (STH) efficiency as high as 0.012% for solar‐driven overall water splitting. These findings not only highlight the grain‐boundary‐free MSCs with peculiar crystal‐facet exposure as highly active photocatalysts for particulate photocatalysis but also provide a rational design approach for developing efficient photocatalysts.

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Morphological design of LaTiO2N particles by topotactic growth mechanisms for photocatalytic applications

Werner,

Zickler,

Pokrant

2024

Progress in Solid State Chemistry

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LaTiO₂N nanopowders (NPs) with low surface defect density via nitridation of flame made NPs retaining simple perovskite structure

Abstract: LaTiO2N NP synthesized from flame made LaTiO3 NP exhibits less absorption background above the optical absorption edge than that synthesized from flame made La2Ti2O7 NP, suggesting a low surface defect density.

Cited by 3 publications

References 46 publications

Single-Crystalline LaTiO₂N Nanosheets with Regulated Defects for Photocatalytic Overall Water Splitting under Visible Light up to 600 nm

Single-Crystalline LaTiO₂N Nanosheets with Regulated Defects for Photocatalytic Overall Water Splitting under Visible Light up to 600 nm

Unleashing Photocarrier Transport in Mesoporous Single‐Crystalline LaTiO₂N for High‐Efficiency Photocatalytic Water Splitting

Morphological design of LaTiO2N particles by topotactic growth mechanisms for photocatalytic applications

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LaTiO2N nanopowders (NPs) with low surface defect density via nitridation of flame made NPs retaining simple perovskite structure

Abstract: LaTiO2N NP synthesized from flame made LaTiO3 NP exhibits less absorption background above the optical absorption edge than that synthesized from flame made La2Ti2O7 NP, suggesting a low surface defect density.

Cited by 3 publications

References 46 publications

Single-Crystalline LaTiO2N Nanosheets with Regulated Defects for Photocatalytic Overall Water Splitting under Visible Light up to 600 nm

Single-Crystalline LaTiO2N Nanosheets with Regulated Defects for Photocatalytic Overall Water Splitting under Visible Light up to 600 nm

Unleashing Photocarrier Transport in Mesoporous Single‐Crystalline LaTiO2N for High‐Efficiency Photocatalytic Water Splitting

Morphological design of LaTiO2N particles by topotactic growth mechanisms for photocatalytic applications

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Product

Resources

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LaTiO₂N nanopowders (NPs) with low surface defect density via nitridation of flame made NPs retaining simple perovskite structure

Single-Crystalline LaTiO₂N Nanosheets with Regulated Defects for Photocatalytic Overall Water Splitting under Visible Light up to 600 nm

Single-Crystalline LaTiO₂N Nanosheets with Regulated Defects for Photocatalytic Overall Water Splitting under Visible Light up to 600 nm

Unleashing Photocarrier Transport in Mesoporous Single‐Crystalline LaTiO₂N for High‐Efficiency Photocatalytic Water Splitting