A Plasmonic Molybdenum Oxide Hybrid with Reversible Tunability for Visible‐Light‐Enhanced Catalytic Reactions

Cheng, Hefeng; Qian, Xufang; Kuwahara, Yasutaka; Mori, Kohsuke; Yamashita, Hiromi

doi:10.1002/adma.201501172

Cited by 191 publications

(155 citation statements)

References 39 publications

(41 reference statements)

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“…For S3, the optical absorption of amorphous MoO 3 photochromic display is due to small polaron absorption at visible range. For S2 in Figure 3b 1 , it contains MoO 2.76 with plasmon resonance absorption at 1.35 eV. Comparing S2 and S3 with S1, aside from the difference in the free electron concentration, the nanopowder size and morphology both show some differences.…”

Section: Figurementioning

confidence: 99%

Selective and Tunable Near‐Infrared and Visible Light Transmittance of MoO_3−x Nanocomposites with Different Crystallinity

Sun

et al. 2017

Chemistry An Asian Journal

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In this Communication, we report MoO nanocomposites in which the near-infrared and visible light transmittance can be selectively modulated through the crystallinity. The MoO nanocomposites were fabricated by a hydrothermal method, and their optical properties were characterized by UV-Vis spectrometer. The obtained results proved the possibility to tune the nanocomposite's optical properties in the UV/Visible spectral region: crystalline MoO mainly regulates the near-infrared range (800-2600 nm), and amorphous MoO mainly changes the visible range from 350 nm to 800 nm and MoO , with semi-crystalline structures mainly modulating around 800-1000 nm. These kinds of optical modulations could be attributed to small polar absorption, free electron absorption and plasmon absorption according to different crystallinity. Our work may create new possibilities for future applications such as photochromism, photocatalysis, and electrochromism.

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Section: Figurementioning

confidence: 99%

Selective and Tunable Near‐Infrared and Visible Light Transmittance of MoO_3−x Nanocomposites with Different Crystallinity

Sun

et al. 2017

Chemistry An Asian Journal

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“…There has been al ot of research into catalysts for hydrogen generation,a sh ydrogen is an ideal environmentally friendly energy source forf uel cells. The hydrogencontaining compounds formic acid, hydrazine, and ammonia borane are promisingc andidates for the storagea nd transport of hydrogen, [29][30][31][32][33][34][35][36][37] especially,a mmonia borane, which is as olid at RT and has ah igh hydrogen content (19.6 wt %).Three mole equivalents of hydrogen gas is formed upon the decomposition of ammonia borane [Eq. (1)].…”

Section: Resultsmentioning

confidence: 99%

Skeletal Ni Catalysts Prepared from Amorphous Ni–Zr Alloys: Enhanced Catalytic Performance for Hydrogen Generation from Ammonia Borane

et al. 2015

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Skeletal Ni catalysts were prepared from Ni-Zr alloys, which possess different chemical composition and atomic arrangements, by a combination of thermal treatment and treatment with aqueous HF. Hydrogen generation from ammonia borane over the skeletal Ni catalysts proceeded efficiently, whereas the amorphous Ni-Zr alloy was inactive. Skeletal Ni prepared from amorphous Ni30 Zr70 alloy had a higher catalytic activity than that prepared from amorphous Ni40 Zr60 and Ni50 Zr50 alloys. The atomic arrangement of the Ni-Zr alloy also strongly affected the surface structure and catalytic activities. Thermal treatment of the amorphous Ni-Zr alloys at a temperature slightly lower than the crystallization temperature led to an increase of the number of surface-exposed Ni atoms and an enhancement of the catalytic activities for hydrogen generation from ammonia borane. The skeletal Ni catalysts also showed excellent durability and recyclability.

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“…However, by using a Pd@Nb 2 O 5 sample with double the Pd loading (1 wt%), the Pd XPS signal could be discerned where binding energies of Pd 3d at 335.6 eV and 340.8 eV are assigned to the 3d 5/2 and 3d 3/2 spin-orbit peaks of metallic Pd, further validating the accumulating evidence that Pd nanocrystals are in the zero-valent metallic state in the Pd@Nb 2 O 5 sample ( Figure S4, Supporting Information). [ 28 ] The optical properties of different samples will now be presented. Figure 3 a depicts the diffuse refl ectance spectra of each sample measured over the spectral range from 250 to 2400 nm.…”

Section: Characterization Of Nanostructured Pd@nb 2 Omentioning

confidence: 99%

Visible and Near‐Infrared Photothermal Catalyzed Hydrogenation of Gaseous CO₂ over Nanostructured Pd@Nb₂O₅

et al. 2016

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The reverse water gas shift (RWGS) reaction driven by Nb2O5 nanorod‐supported Pd nanocrystals without external heating using visible and near infrared (NIR) light is demonstrated. By measuring the dependence of the RWGS reaction rates on the intensity and spectral power distribution of filtered light incident onto the nanostructured Pd@Nb2O5 catalyst, it is determined that the RWGS reaction is activated photothermally. That is the RWGS reaction is initiated by heat generated from thermalization of charge carriers in the Pd nanocrystals that are excited by interband and intraband absorption of visible and NIR light. Taking advantage of this photothermal effect, a visible and NIR responsive Pd@Nb2O5 hybrid catalyst that efficiently hydrogenates CO2 to CO at an impressive rate as high as 1.8 mmol gcat−1 h−1 is developed. The mechanism of this photothermal reaction involves H2 dissociation on Pd nanocrystals and subsequent spillover of H to the Nb2O5 nanorods whereupon adsorbed CO2 is hydrogenated to CO. This work represents a significant enhancement in our understanding of the underlying mechanism of photothermally driven CO2 reduction and will help guide the way toward the development of highly efficient catalysts that exploit the full solar spectrum to convert gas‐phase CO2 to valuable chemicals and fuels.

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A Plasmonic Molybdenum Oxide Hybrid with Reversible Tunability for Visible‐Light‐Enhanced Catalytic Reactions

Cited by 191 publications

References 39 publications

Selective and Tunable Near‐Infrared and Visible Light Transmittance of MoO_3−x Nanocomposites with Different Crystallinity

Selective and Tunable Near‐Infrared and Visible Light Transmittance of MoO_3−x Nanocomposites with Different Crystallinity

Skeletal Ni Catalysts Prepared from Amorphous Ni–Zr Alloys: Enhanced Catalytic Performance for Hydrogen Generation from Ammonia Borane

Visible and Near‐Infrared Photothermal Catalyzed Hydrogenation of Gaseous CO₂ over Nanostructured Pd@Nb₂O₅

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A Plasmonic Molybdenum Oxide Hybrid with Reversible Tunability for Visible‐Light‐Enhanced Catalytic Reactions

Cited by 191 publications

References 39 publications

Selective and Tunable Near‐Infrared and Visible Light Transmittance of MoO3−x Nanocomposites with Different Crystallinity

Selective and Tunable Near‐Infrared and Visible Light Transmittance of MoO3−x Nanocomposites with Different Crystallinity

Skeletal Ni Catalysts Prepared from Amorphous Ni–Zr Alloys: Enhanced Catalytic Performance for Hydrogen Generation from Ammonia Borane

Visible and Near‐Infrared Photothermal Catalyzed Hydrogenation of Gaseous CO2 over Nanostructured Pd@Nb2O5

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Selective and Tunable Near‐Infrared and Visible Light Transmittance of MoO_3−x Nanocomposites with Different Crystallinity

Selective and Tunable Near‐Infrared and Visible Light Transmittance of MoO_3−x Nanocomposites with Different Crystallinity

Visible and Near‐Infrared Photothermal Catalyzed Hydrogenation of Gaseous CO₂ over Nanostructured Pd@Nb₂O₅