scholarly journals An Unusual Strong Visible-Light Absorption Band in Red Anatase TiO2Photocatalyst Induced by Atomic Hydrogen-Occupied Oxygen Vacancies

2018 ◽  
Vol 30 (6) ◽  
pp. 1704479 ◽  
Author(s):  
Yongqiang Yang ◽  
Li-Chang Yin ◽  
Yue Gong ◽  
Ping Niu ◽  
Jian-Qiang Wang ◽  
...  
Keyword(s):  
Absorption Band ◽  
Visible Light ◽  
Light Absorption ◽  
Atomic Hydrogen ◽  
Oxygen Vacancies ◽  
Visible Light Absorption

scholarly journals Visible-light photocatalysis on C-doped ZnO derived from polymer-assisted pyrolysis

RSC Advances ◽  
2015 ◽  
Vol 5 (35) ◽  
pp. 27690-27698 ◽  
Author(s):  
Ahmad S. Alshammari ◽  
Lina Chi ◽  
Xiaoping Chen ◽  
Abdulaziz Bagabas ◽  
Denis Kramer ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Light Absorption ◽  
Oxygen Vacancies ◽  
Charge Carriers ◽  
Visible Light Photocatalysis ◽  
Visible Light Absorption ◽  
C Doping ◽  
Doped Zno

Heavy C-doping can effectively enhance visible-light absorption yet exhibited lower visible-light-responsive photocatalytic activity due to significant recombination of photogenerated charge carriers caused by C-dopant and oxygen vacancies.

SrNbO2N as a Water-Splitting Photoanode with a Wide Visible-Light Absorption Band

2011 ◽  
Vol 133 (32) ◽  
pp. 12334-12337 ◽  
Author(s):  
Kazuhiko Maeda ◽  
Masanobu Higashi ◽  
Bhavin Siritanaratkul ◽  
Ryu Abe ◽  
Kazunari Domen
Keyword(s):  
Absorption Band ◽  
Visible Light ◽  
Water Splitting ◽  
Light Absorption ◽  
Visible Light Absorption

Sn-Based Perovskite with a Wide Visible-Light Absorption Band Assisted by Hydride Doping

2021 ◽  
Author(s):  
Masashi Nakamura ◽  
Hiroshi Watanabe ◽  
Hirofumi Akamatsu ◽  
Kotaro Fujii ◽  
Masatomo Yashima ◽  
...  
Keyword(s):  
Absorption Band ◽  
Visible Light ◽  
Light Absorption ◽  
Visible Light Absorption

ChemInform Abstract: SrNbO2N as a Water-Splitting Photoanode with a Wide Visible-Light Absorption Band.

ChemInform ◽  
2011 ◽  
Vol 42 (49) ◽  
pp. no-no
Author(s):  
Kazuhiko Maeda ◽  
Masanobu Higashi ◽  
Bhavin Siritanaratkul ◽  
Ryu Abe ◽  
Kazunari Domen
Keyword(s):  
Absorption Band ◽  
Visible Light ◽  
Water Splitting ◽  
Light Absorption ◽  
Visible Light Absorption

Promotion mechanism of -OH groups intercalation for NOx purification on BiOI photocatalyst

Nanoscale ◽  
2021 ◽  
Author(s):  
Weiping Yang ◽  
Qin Ren ◽  
Fengyi Zhong ◽  
Yanxia Wang ◽  
Jielin Wang ◽  
...  
Keyword(s):  
Absorption Band ◽  
Band Structure ◽  
Visible Light ◽  
Light Absorption ◽  
Photocatalytic Efficiency ◽  
Visible Light Absorption ◽  
Oh Groups ◽  
Layered Oxide ◽  
Promotion Mechanism

Bismuth oxyiodide (BiOI) is one of the traditional layered oxide photocatalyst that performs wide visible-light absorption band owning to appropriate band structure. Nevertheless, the photocatalytic efficiency is immensely prohibited according...

scholarly journals Low-frequency ultrasound induces oxygen vacancies formation and visible light absorption in TiO2 P-25 nanoparticles

2012 ◽  
Vol 19 (3) ◽  
pp. 383-386 ◽  
Author(s):  
Paula A. Osorio-Vargas ◽  
Cesar Pulgarin ◽  
Andrzej Sienkiewicz ◽  
Luis R. Pizzio ◽  
Mirta N. Blanco ◽  
...  
Keyword(s):  
Visible Light ◽  
Light Absorption ◽  
Oxygen Vacancies ◽  
Low Frequency ◽  
Visible Light Absorption ◽  
Low Frequency Ultrasound ◽  
Frequency Ultrasound

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>

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