Cobalt Oxide Nanoclusters on Rutile Titania as Bifunctional Units for Water Oxidation Catalysis and Visible Light Absorption: Understanding the Structure–Activity Relationship

2017 ◽  
Vol 9 (7) ◽  
pp. 6114-6122 ◽  
Author(s):  
Kazuhiko Maeda ◽  
Koki Ishimaki ◽  
Megumi Okazaki ◽  
Tomoki Kanazawa ◽  
Daling Lu ◽  
...  
Keyword(s):  
Visible Light ◽  
Cobalt Oxide ◽  
Light Absorption ◽  
Water Oxidation ◽  
Oxidation Catalysis ◽  
Activity Relationship ◽  
Visible Light Absorption ◽  
Structure Activity ◽  
Water Oxidation Catalysis ◽  
Rutile Titania

Concentrated-acid triggered superfast generation of porous amorphous cobalt oxide toward efficient water oxidation catalysis in alkaline solution

2019 ◽  
Vol 55 (12) ◽  
pp. 1797-1800 ◽  
Author(s):  
Xuqiang Ji ◽  
Yujia He ◽  
Jingquan Liu
Keyword(s):  
Cobalt Oxide ◽  
Alkaline Solution ◽  
Water Oxidation ◽  
Oxidation Catalysis ◽  
Oxidation Catalyst ◽  
Carbon Cloth ◽  
Water Oxidation Catalysis

Amorphous cobalt oxide on carbon cloth (AMO-CoO/CC) was prepared as an excellent water-oxidation catalyst with 50 mV less overpotential at 10 mA cm−2 than highly-crystallized Co3O4 in 1.0 M KOH.

High Spin State Promotes Water Oxidation Catalysis at Neutral pH in Spinel Cobalt Oxide

2018 ◽  
Vol 57 (5) ◽  
pp. 1441-1445 ◽  
Author(s):  
Lin Ma ◽  
Sung-Fu Hung ◽  
Liping Zhang ◽  
Weizheng Cai ◽  
Hong Bin Yang ◽  
...  
Keyword(s):  
Cobalt Oxide ◽  
High Spin ◽  
Spin State ◽  
Water Oxidation ◽  
High Spin State ◽  
Oxidation Catalysis ◽  
Neutral Ph ◽  
Water Oxidation Catalysis

Visible light-driven water oxidation with a subporphyrin sensitizer and a water oxidation catalyst

2016 ◽  
Vol 52 (94) ◽  
pp. 13702-13705 ◽  
Author(s):  
Masanori Yamamoto ◽  
Yusuke Nishizawa ◽  
Pavel Chábera ◽  
Fusheng Li ◽  
Torbjörn Pascher ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Visible Light ◽  
Light Absorption ◽  
Water Oxidation ◽  
Artificial Photosynthesis ◽  
Oxidation Catalyst ◽  
Interfacial Electron Transfer ◽  
Visible Light Absorption ◽  
Visible Light Driven

A newly designed contracted porphyrin achieved efficient visible light absorption and interfacial electron transfer for water oxidation in artificial photosynthesis.

Controllable synthesis of conical BiVO4 for photocatalytic water oxidation

2020 ◽  
Vol 8 (5) ◽  
pp. 2331-2335 ◽  
Author(s):  
Li Jie Wang ◽  
Jing Yang Bai ◽  
Yi Jun Zhang ◽  
Fangxin Mao ◽  
Yuanwei Liu ◽  
...  
Keyword(s):  
Visible Light ◽  
Light Absorption ◽  
Water Oxidation ◽  
Curved Surface ◽  
Controllable Synthesis ◽  
Free Standing ◽  
Absorption Region ◽  
Visible Light Absorption

Free-standing conical BiVO4 crystals featuring a curved surface and sharp tips were synthesized. The sample exhibited an enlarged visible light absorption region and good photocatalytic water oxidation ability.

Efficient difunctional photocatalyst prepared in situ from Prussian blue analogues for catalytic water oxidation and visible-light absorption

2018 ◽  
Vol 8 (24) ◽  
pp. 6375-6383 ◽  
Author(s):  
Jia Guo ◽  
Hui Li ◽  
Di Wang ◽  
Liugen Zhang ◽  
Yuhua Ma ◽  
...  
Keyword(s):  
Visible Light ◽  
Prussian Blue ◽  
Light Absorption ◽  
Water Oxidation ◽  
Cuo Nanoparticles ◽  
Oxidation Catalysts ◽  
Visible Light Absorption ◽  
Prussian Blue Analogues ◽  
Visible Light Driven

Co(OH)2-modified CuO (Co(OH)2/CuO) nanoparticles serve as both visible-light-driven water oxidation catalysts and visible-light-absorption centers.

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
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