Ca2-αLaαNb3-βXβO10 Nanosheet Photocatalyst for Hydrogen Generation from Water Splitting

MRS Advances ◽  
2018 ◽  
Vol 3 (47-48) ◽  
pp. 2847-2854 ◽  
Author(s):  
Hitomi Ohmagari ◽  
Mohammad Razaul Karim ◽  
Yuta Shudo ◽  
Shintaro Ida ◽  
Ryo Ohtani ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Water Splitting ◽  
Room Temperature ◽  
Hydrogen Generation ◽  
Heterogeneous Structure ◽  
Metal Precursors ◽  
Photocatalytic Activities

ABSTRACTCa2-αLaαNb3-βXβO10 nanosheets ((α, β=0-0.14), X= Rh(LaRh), Mn(LaMn), Fe(LaFe), Ni(LaNi)) were synthesized by exfoliation using the surfactant aided sonication method. These nanosheets demonstrated superior photocatalytic activities for water splitting into hydrogen at room temperature. SEM-EDX images and spectra confirmed the morphology and composition of the materials where doped metal precursors inserted into the heterogeneous structure aided the photocatalytic activity.

scholarly journals Ultrasound-Assisted Rapid ZIF-8 Synthesis, Porous ZnO Preparation by Heating ZIF-8, and Their Photocatalytic Activity

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Pham Dinh Du ◽  
Nguyen Trung Hieu ◽  
Tran Vinh Thien
Keyword(s):  
Photocatalytic Activity ◽  
Room Temperature ◽  
Diffuse Reflectance ◽  
Nitrogen Adsorption ◽  
X Ray Diffraction ◽  
Zeolitic Imidazolate Framework ◽  
X Ray ◽  
Photocatalytic Activities ◽  
Ft Ir ◽  
Adsorption Desorption

Zeolitic imidazolate framework-8 (ZIF-8) is synthesized quickly at room temperature in methanol with the support of ultrasound. Porous ZnO is also prepared via the thermal treatment of ZIF-8. The photocatalytic activities of the obtained materials are demonstrated via methylene blue (MB) decomposition under UV radiation. The obtained materials are characterized by means of X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), nitrogen adsorption/desorption isotherms, UV-Vis diffuse reflectance spectra (DR-UV-Vis), and photoluminescence spectra. The results indicate that ZIF-8 and the materials obtained from ZIF-8 by heating in the air have photocatalytic activity under UV irradiation. The ZnO sample obtained by ZIF-8 calcination at 660°C for 5 h has the highest photocatalytic activity. However, the MB degradation photocatalytic efficiency of the ZnO samples is even lower than that of the ZIF-8 samples, indicating that ZIF-8 is an effective photocatalyst in the treatment of environmental pollution.

scholarly journals Exploration and evaluation of proton source-assisted photocatalyst for hydrogen generation

2019 ◽  
Vol 18 (7) ◽  
pp. 1716-1726 ◽  
Author(s):  
T. C. Bhagya ◽  
Athira Krishnan ◽  
Arunima Rajan S ◽  
Ameen Sha M ◽  
B. R. Sreelekshmy ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Water Splitting ◽  
Hydrogen Generation ◽  
Proton Source

The DAH proton source assisted Fe2O3–TiO2 system exhibits exceptional photocatalytic activity and stability for hydrogen generation by a water-splitting reaction.

scholarly journals Group-IVA element-doped SrIn2O4 as potential materials for hydrogen production from water splitting with solar energy

RSC Advances ◽  
2018 ◽  
Vol 8 (56) ◽  
pp. 32317-32324
Author(s):  
Hai-Cai Huang ◽  
Chuan-Lu Yang ◽  
Mei-Shan Wang ◽  
Xiao-Guang Ma ◽  
You-Gen Yi
Keyword(s):  
Photocatalytic Activity ◽  
Hydrogen Production ◽  
Solar Energy ◽  
Band Gap ◽  
Water Splitting ◽  
Hydrogen Generation ◽  
Band Gap Engineering ◽  
Group Iva

Band gap engineering can efficiently improve the photocatalytic activity of semiconductors for hydrogen generation from water splitting.

scholarly journals Deposition of platinum on boron-doped TiO2/Ti nanotube arrays as an efficient and stable photocatalyst for hydrogen generation from water splitting

RSC Advances ◽  
2019 ◽  
Vol 9 (20) ◽  
pp. 11443-11450 ◽  
Author(s):  
Mengjia Sun ◽  
Yanli Jiang ◽  
Mei Tian ◽  
Huijun Yan ◽  
Ran Liu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Water Splitting ◽  
Anodic Oxidation ◽  
Hydrogen Generation ◽  
Nanotube Arrays ◽  
Doped Tio2 ◽  
Boron Doped ◽  
Excellent Photocatalytic Activity

Pt–B/TiO2/Ti NTs, prepared by anodic oxidation and photo-deposition methods, showed excellent photocatalytic activity.

SODIUM TANTALATE SPHERES PREPARED VIA AN ELECTROCHEMICAL PROCESS AND THEIR PHOTOELECTROCHEMICAL BEHAVIOR

NANO ◽  
2013 ◽  
Vol 08 (03) ◽  
pp. 1350024 ◽  
Author(s):  
XUEWEN WANG ◽  
LI ZHOU
Keyword(s):  
Photocatalytic Activity ◽  
Thermal Treatment ◽  
Water Splitting ◽  
Room Temperature ◽  
Electrochemical Process ◽  
Photoelectrochemical Water Splitting ◽  
Crystalline Core ◽  
Morphology And Structure ◽  
Pure Phase ◽  
Semiconductor Photocatalyst

Photocatalytic activity can be improved through modified morphology and structure. Sodium tantalate ( NaTaO3 ) as a semiconductor photocatalyst is extensively used for photocatalytic water splitting. A novel electrochemical route was developed for preparing NaTaO3 spheres. The method can easily and fast synthesize high pure phase NaTaO3 spheres at room temperature. The NaTaO3 sphere structure consists of a crystalline core and an amorphous shell. After a thermal treatment, the NaTaO3 spheres show an enhanced photoelectrochemical water splitting ability.

scholarly journals Fabrication of ILs-Assisted AgTaO3 Nanoparticles for the Water Splitting Reaction: The Effect of ILs on Morphology and Photoactivity

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4055
Author(s):  
Julia Zwara ◽  
Anna Pancielejko ◽  
Marta Paszkiewicz-Gawron ◽  
Justyna Łuczak ◽  
Magdalena Miodyńska ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Ionic Liquids ◽  
Solid State ◽  
Water Splitting ◽  
Hydrogen Generation ◽  
Sol Gel ◽  
Pt Nanoparticles ◽  
H2 Production ◽  
Solid State Reactions ◽  
Platinum Particles

The design of an active, stable and efficient photocatalyst that is able to be used for hydrogen production is of great interest nowadays. Therefore, four methods of AgTaO3 perovskite synthesis, such as hydrothermal, solvothermal, sol-gel and solid state reactions, were proposed in this study to identify the one with the highest hydrogen generation efficiency by the water splitting reaction. The comprehensive results clearly show that the solid state reaction (SSR) led to the obtainment of a sample with an almost seven times higher photocatalytic activity than the other methods. Furthermore, four ionic liquids, all possessing nitrogen in the form of organic cations (two imidazoliums with different anions, ammonium and tetrazolium), were used for the first time to prepare composites consisting of AgTaO3 modified with IL and Pt, simultaneously. The effect of the ionic liquids (ILs) and Pt nanoparticles’ presence on the structure, morphology, optical properties, elemental composition and the effectiveness of the hydrogen generation was investigated and discussed. The morphology investigation revealed that the AgTaO3 photocatalysts with the application of [OMIM]-cation based ILs created smaller granules (<500 nm), whereas [TBA] [Cl] and [TPTZ] [Cl] ILs caused the formation of larger particles (up to 2 μm). We found that various ILs used for the synthesis did not improve the photocatalytic activity of the obtained samples in comparison with pristine AgTaO3. It was detected that the compound with the highest ability for hydrogen generation under UV-Vis irradiation was the AgTaO3_0.2% Pt (248.5 μmol∙g−1), having an almost 13 times higher efficiency in comparison with the non-modified pristine sample. It is evidenced that the enhanced photocatalytic activity of modified composites originated mainly from the presence of the platinum particles. The mechanism of photocatalytic H2 production under UV-Vis light irradiation in the presence of an AgTaO3_IL_Pt composite in the water splitting reaction was also proposed.

scholarly journals Infrared response in photocatalytic polymeric carbon nitride for water splitting via an upconversion mechanism

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Zhengyuan Jin ◽  
Xiantao Jiang ◽  
Qitao Zhang ◽  
Shaolong Huang ◽  
Luhong Zhang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Water Splitting ◽  
Carbon Nitride ◽  
Hydrogen Generation ◽  
Matrix Ring ◽  
High Photocatalytic Activity ◽  
Infrared Light ◽  
Hydrogen Energy ◽  
Polymeric Carbon

AbstractBroad-spectrum light activation in photocatalytic materials is considered vital for effective solar-to-hydrogen energy conversion. Here, we propose an upconversion process in oxygen-doped polymeric carbon nitride (C3N4) nanosheets, resulting in high photocatalytic activity for hydrogen generation from water splitting under infrared light irradiation. Due to the upconversion, the photoexcited electrons are transferred to the conduction band, and a σ* carbon-oxygen orbital localized on the triazine matrix ring resulting from oxygen doping extends the lifetime of photogenerated electrons, which increases the photocatalytic activity under both infrared and visible light. Our material exhibits high apparent quantum efficiency of 0.014% and 23% at 850 nm and 420 nm, respectively. Under infrared light (λ ≥ 800 nm, 24 mW cm−2), the hydrogen production rate of our material is 22.84 μmol h−1 g−1, which can reach a yield similar to that of pristine C3N4 under visible light.

Low Temperature Synthesis Method of La2O2S2 and Evaluation of the Photocatalytic Activity

2010 ◽  
Vol 445 ◽  
pp. 217-220 ◽  
Author(s):  
Mamoru Ohashi ◽  
Tadashi Ishigaki ◽  
Kazuyoshi Uematsu ◽  
Kenji Toda ◽  
Mineo Sato
Keyword(s):  
Photocatalytic Activity ◽  
Low Temperature ◽  
Solar Energy ◽  
Visible Light ◽  
Water Splitting ◽  
Hydrogen Generation ◽  
Synthesis Method ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Energy Applications

Photocatalysts for overall water splitting have great potential in solar energy applications. A variety of photocatalysts have shown activity for water splitting. In particular, oxysulfides are the great interest because of their ability to generate H2 and O2 from water under visible light. However, they are generally synthesized under H2S flow, which is an extremely harmful gas for humans. In this study, La2O2S2 was synthesized at low temperature without H2S gas, and its photocatalytic activity was confirmed by hydrogen generation experiments.

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