Highly visible-light absorbing black TiO2 nanocrystals synthesized by sol–gel method and subsequent heat treatment in low partial pressure H2

Wu, Ming‐Chung; Chang, I-Chun; Hsiao, Kai‐Chi; Huang, Wei-Kang

doi:10.1016/j.jtice.2016.02.026

Cited by 21 publications

(5 citation statements)

References 34 publications

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“…The discovery of hydrogenated TiO 2 materials with visible light absorption has initiated significant interest in solar driven applications232425262728. Sun et al .…”

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confidence: 99%

Improved Solar-Driven Photocatalytic Performance of Highly Crystalline Hydrogenated TiO2 Nanofibers with Core-Shell Structure

Chen

Huang

et al. 2017

Sci Rep

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Hydrogenated titanium dioxide has attracted intensive research interests in pollutant removal applications due to its high photocatalytic activity. Herein, we demonstrate hydrogenated TiO2 nanofibers (H:TiO2 NFs) with a core-shell structure prepared by the hydrothermal synthesis and subsequent heat treatment in hydrogen flow. H:TiO2 NFs has excellent solar light absorption and photogenerated charge formation behavior as confirmed by optical absorbance, photo-Kelvin force probe microscopy and photoinduced charge carrier dynamics analyses. Photodegradation of various organic dyes such as methyl orange, rhodamine 6G and brilliant green is shown to take place with significantly higher rates on our novel catalyst than on pristine TiO2 nanofibers and commercial nanoparticle based photocatalytic materials, which is attributed to surface defects (oxygen vacancy and Ti3+ interstitial defect) on the hydrogen treated surface. We propose three properties/mechanisms responsible for the enhanced photocatalytic activity, which are: (1) improved absorbance allowing for increased exciton generation, (2) highly crystalline anatase TiO2 that promotes fast charge transport rate, and (3) decreased charge recombination caused by the nanoscopic Schottky junctions at the interface of pristine core and hydrogenated shell thus promoting long-life surface charges. The developed H:TiO2 NFs can be helpful for future high performance photocatalysts in environmental applications.

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“…The discovery of hydrogenated TiO 2 materials with visible light absorption has initiated significant interest in solar driven applications232425262728. Sun et al .…”

mentioning

confidence: 99%

Improved Solar-Driven Photocatalytic Performance of Highly Crystalline Hydrogenated TiO2 Nanofibers with Core-Shell Structure

Chen

Huang

et al. 2017

Sci Rep

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“…Reducing the catalyst amount to 1 mol % resulted in 70% yield of 2a, while increasing the catalyst loading to 5 mol % produced 2a (80%) along with its alkylated product (3-isopropoxypropenylbenzene, 20%, 5a) with 2-propanol in quantitative conversion (Figure c). To elucidate the specific roles of cobalt and titania supports (black, rutile or anatase), the synthesized catalysts were screened for a model under optimized reaction condition as depicted in Table . ,− Initially, cobalt oxide (Co 3 O 4 ), anatase TiO 2 (a-TiO 2 ), and their 1:1 combination were screened for the reaction (Table , entries 2–4). Interestingly, a-TiO 2 showed complete inactivity (Table , entry 3), while Co 3 O 4 produced a mixture of products in 26% overall conversion (Table , entry 2).…”

Section: Resultsmentioning

confidence: 99%

Co–Ti Bimetallic Complex-Induced Phase Modulation of Co@Black TiO₂ for Catalytic Hydrogenation of Cinnamaldehyde

Mishra,

Mrugesh,

Subramanian

et al. 2024

Inorg. Chem.

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Transition-metal-doped black titania, primarily in the anatase phase, shows promise for redox reactions, water splitting, hydrogen generation, and organic pollutant removal, but exploring other titania phases for broader catalytic applications is underexplored. This study introduces a synthetic approach using a Co–Ti bimetallic complex bridged by a 1,10-phenanthroline-5,6-dione ligand as a precursor for the synthesis of cobalt-doped black titania [Co@L2N@b-TiO2]. The synthesis involves precise control of pyrolysis conditions, yielding a distinct structure dominated by the rutile phase over anatase, with active cobalt encapsulated within a nitrogen-doped graphitic layer, primarily as Co0 rather than CoII and CoIII. The synthesized material is employed for the selective hydrogenation of cinnamaldehyde (CAL) to cinnamyl alcohol (COL) under industrially viable conditions. The efficiency and selectivity of Co@L2N@b-TiO2 was compared with other catalysts, including cobalt-doped rutile TiO2 (Co@r-TiO2), anatase TiO2 (Co@a-TiO2), and black titania (Co@b-TiO2) as well as materials pyrolyzed under different atmospheres and temperatures, materials with phenanthroline ligands, and materials lacking any ligands. The superior performance of Co@L2N@b-TiO2 is attributed to its high surface area, stable Co0 within the nitrogen-doped graphitic layer, and composition of rutile and anatase phases of TiO2 and Ti2O3 (referred to as RAT), along with the synergistic interaction between RAT and Co0. These factors significantly influence the efficiency and selectivity of COL over hydrocinnamaldehyde (HCAL) and hydrocinnamyl alcohol (HCOL), indicating potential for broader applications beyond catalysis, particularly in designing of black titania-based materials.

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“…Interestingly, the concentration of oxygen vacancies within the prepared TiO 2 annealed in the H 2 –N 2 atmosphere is more than that calcined in an open atmosphere/oxygen-rich environment, indicating that the oxygen deficiency in the surrounding is the main cause of the vacancy, which further changes the material color, rather than the carbon doping. 74 …”

Section: Fabrication Of Black Tiomentioning

confidence: 99%

Black titania an emerging photocatalyst: review highlighting the synthesis techniques and photocatalytic activity for hydrogen generation

et al. 2021

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Highly visible-light absorbing black TiO2 nanocrystals synthesized by sol–gel method and subsequent heat treatment in low partial pressure H2

Cited by 21 publications

References 34 publications

Improved Solar-Driven Photocatalytic Performance of Highly Crystalline Hydrogenated TiO2 Nanofibers with Core-Shell Structure

Improved Solar-Driven Photocatalytic Performance of Highly Crystalline Hydrogenated TiO2 Nanofibers with Core-Shell Structure

Co–Ti Bimetallic Complex-Induced Phase Modulation of Co@Black TiO₂ for Catalytic Hydrogenation of Cinnamaldehyde

Black titania an emerging photocatalyst: review highlighting the synthesis techniques and photocatalytic activity for hydrogen generation

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Highly visible-light absorbing black TiO2 nanocrystals synthesized by sol–gel method and subsequent heat treatment in low partial pressure H2

Cited by 21 publications

References 34 publications

Improved Solar-Driven Photocatalytic Performance of Highly Crystalline Hydrogenated TiO2 Nanofibers with Core-Shell Structure

Improved Solar-Driven Photocatalytic Performance of Highly Crystalline Hydrogenated TiO2 Nanofibers with Core-Shell Structure

Co–Ti Bimetallic Complex-Induced Phase Modulation of Co@Black TiO2 for Catalytic Hydrogenation of Cinnamaldehyde

Black titania an emerging photocatalyst: review highlighting the synthesis techniques and photocatalytic activity for hydrogen generation

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Co–Ti Bimetallic Complex-Induced Phase Modulation of Co@Black TiO₂ for Catalytic Hydrogenation of Cinnamaldehyde