Metal–organic frameworks for visible light absorption via anion substitution

2012 ◽  
Vol 22 (20) ◽  
pp. 10144 ◽  
Author(s):  
Jung Hoon Choi ◽  
Hyung Joon Jeon ◽  
Kyung Min Choi ◽  
Jeung Ku Kang
Keyword(s):  
Visible Light ◽  
Light Absorption ◽  
Metal Organic Frameworks ◽  
Visible Light Absorption ◽  
Anion Substitution ◽  
Metal Organic

Lanthanide-based near-infrared emitting metal–organic frameworks with tunable excitation wavelengths and high quantum yields

2018 ◽  
Vol 54 (50) ◽  
pp. 6816-6819 ◽  
Author(s):  
Tu N. Nguyen ◽  
Gloria Capano ◽  
Andrzej Gładysiak ◽  
Fatmah Mish Ebrahim ◽  
Svetlana V. Eliseeva ◽  
...  
Keyword(s):  
Visible Light ◽  
Light Absorption ◽  
Near Infrared ◽  
Metal Organic Frameworks ◽  
Quantum Yields ◽  
Visible Light Absorption ◽  
High Quantum ◽  
Nir Light ◽  
Metal Organic

The introduction of –NH2 group in SION-100 allows the visible light absorption, and both SION-100 and SION-100-NH2 luminesce NIR light with long lifetimes and high quantum yields.

Tuning the properties of the metal–organic framework UiO-67-bpy via post-synthetic N-quaternization of pyridine sites

2016 ◽  
Vol 45 (20) ◽  
pp. 8614-8621 ◽  
Author(s):  
Lei Xu ◽  
Yanping Luo ◽  
Lin Sun ◽  
Shan Pu ◽  
Min Fang ◽  
...  
Keyword(s):  
Visible Light ◽  
Light Absorption ◽  
Organic Dyes ◽  
Metal Organic Framework ◽  
Absorption Properties ◽  
Visible Light Absorption ◽  
Anionic Dye ◽  
Metal Organic ◽  
Organic Framework

N-Quaternization of pyridine sites in UiO-67-bpy affords a cationic MOF UiO-67-bpy-Me with faster and improved anionic dye and CO2adsorption, and extended visible-light absorption properties, which make UiO-67-bpy-Me more efficient in photodegrading organic dyes.

scholarly journals Exfoliated Molybdenum Disulfide Encapsulated in a Metal Organic Framework for Enhanced Photocatalytic Hydrogen Evolution

Catalysts ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 89 ◽  
Author(s):  
Ren Ren ◽  
Huilei Zhao ◽  
Xiaoyu Sui ◽  
Xiaoru Guo ◽  
Xingkang Huang ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Visible Light ◽  
Light Absorption ◽  
Photoelectron Spectroscopy ◽  
Metal Organic Framework ◽  
Visible Light Absorption ◽  
X Ray ◽  
Metal Organic ◽  
Direct Band ◽  
Bulk Mos2

An exfoliated MoS2 encapsulated into metal-organic frameworks (MOFs) was fabricated as a promising noble-metal-free photocatalyst for hydrogen production under visible light irradiation. The as-synthesized samples were examined by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and Brunauer–Emmett–Teller (BET) surface analysis. It is well known that bulk MoS2 is unsuitable for photocatalysis due to its inadequate reduction and oxidation capabilities. However, exfoliated MoS2 exhibits a direct band gap of 2.8 eV due to quantum confinement, which enables it to possess suitable band positions and retain a good visible-light absorption ability. As a result, it is considered to be an encouraging candidate for photocatalytic applications. Encapsulating exfoliated MoS2 into MOF demonstrates an improved visible light absorption ability compared to pure MOF, and the highest hydrogen production rate that the encapsulated exfoliated MoS2 could reach was 68.4 μmol h-1g-1, which was much higher than that of pure MOF. With a suitable band structure and improved light-harvesting ability, exfoliated MoS2@MOF could be a potential photocatalyst for hydrogen production.

Enhancing Visible Light Absorption for Ferroelectric Sn2P2S6 by Se Anion Substitution

2018 ◽  
Vol 122 (44) ◽  
pp. 25565-25572 ◽  
Author(s):  
Min Zhao ◽  
Gaoyang Gou ◽  
Xiangdong Ding ◽  
Jun Sun
Keyword(s):  
Visible Light ◽  
Light Absorption ◽  
Visible Light Absorption ◽  
Anion Substitution

Impact of Rutile Fraction on TiO2 Visible-Light Absorption and Visible-Light-Induced Photocatalytic Activity

2018 ◽  
Author(s):  
David Maria Tobaldi ◽  
Luc Lajaunie ◽  
ana caetano ◽  
nejc rozman ◽  
Maria Paula Seabra ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Light Absorption ◽  
Solid Phase ◽  
Diffraction Method ◽  
Band Alignment ◽  
Quantitative Phase Analysis ◽  
Transmission Microscopy ◽  
Visible Light Absorption ◽  
X Ray

<div>Titanium dioxide is by far the most utilised semiconductor material for photocatalytic applications. Still, it is transparent to visible-light. Recently, it has been proved that a type-II band alignment for the rutile−anatase mixture would improve its visible-light absorption.</div><div>In this research paper we thoroughly characterised the real crystalline and amorphous phases of synthesised titanias – thermally treated at different temperatures to get distinct ratios of anatase-rutile-amorphous fraction – as well as that of three commercially available photocatalytic nano-TiO2. </div><div>The structural characterisation was done via advanced X-ray diffraction method, namely the Rietveld-RIR method, to attain a full quantitative phase analysis of the specimens. The microstructure was also investigated via an advanced X-ray method, the whole powder pattern modelling. These methods were validated combining advanced aberration-corrected scanning transmission microscopy and high-resolution electron energy-loss spectroscopy. The photocatalytic activity was assessed in the liquid- and gas-solid phase (employing rhodamine B and 4-chlorophenol, and isopropanol, respectively, as the organic substances to degrade) using a light source irradiating exclusively in the visible-range.</div><div>Optical spectroscopy showed that even a small fraction of rutile (2 wt%) is able to shift to lower energies the apparent optical band gap of an anatase-rutile mixed phase. But is this enough to attain a real photocatalytic activity promoted by merely visible-light?</div><div>We tried to give a reply to that question.</div><div>Photocatalytic activity results in the liquid-solid phase showed that a high surface hydroxylation led to specimen with superior visible light-induced catalytic activity (i.e. dye and ligand-to-metal charge transfer complexes sensitisation effects). That is: not photocatalysis <i>sensu-strictu</i>.</div><div>On the other hand, the gas-solid phase results showed that a higher amount of the rutile fraction (around 10 wt%), together with less recombination of the charge carriers, were more effective for an actual photocatalytic oxidation of isopropanol.</div>

Double Doping of NaTaO3 Photocatalysts with Lanthanum and Manganese for Strongly Enhanced Visible-Light Absorption

2019 ◽  
Vol 2 (10) ◽  
pp. 7518-7526 ◽  
Author(s):  
Hanggara Sudrajat ◽  
Mitsunori Kitta ◽  
Nobuyuki Ichikuni ◽  
Hiroshi Onishi
Keyword(s):  
Visible Light ◽  
Light Absorption ◽  
Visible Light Absorption ◽  
Double Doping

Carrier Engineering of Zr-mediated Ta3N5 Film as Efficient Photoanode for Solar Water Splitting

2021 ◽  
Author(s):  
Xin Zou ◽  
Xueyang Han ◽  
Chengxiong Wang ◽  
Yunkun Zhao ◽  
Chun Du ◽  
...  
Keyword(s):  
Band Structure ◽  
Visible Light ◽  
Water Splitting ◽  
Light Absorption ◽  
Photoelectrochemical Water Splitting ◽  
Promising Candidate ◽  
Visible Light Absorption ◽  
Solar Water ◽  
Solar Water Splitting

Ta3N5 is regarded as a promising candidate material with adequate visible light absorption and band structure for photoelectrochemical water splitting. However, the performance of Ta3N5 is severely limited by the...

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