Highly dispersed MoSx nanodot-modified TiO2 photocatalysts: vitamin C-mediated synthesis and improved H2 evolution activity

2021 ◽  
Author(s):  
Jiangyuan He ◽  
Wei Zhong ◽  
Ying Xu ◽  
Jiajie Fan ◽  
Huogen Yu ◽  
...  
Keyword(s):  
Vitamin C ◽  
H2 Evolution ◽  
Tio2 Photocatalysts ◽  
Highly Dispersed

Highly dispersed MoSx nanodots are loaded on the TiO2 surface via a thin-layered carbon supporter to attain a significantly boosted photocatalytic H2-evolution performance by applying a vitamin C-mediated method.

Effect of Water/Acetonitrile Ratio on Dye-Sensitized Photocatalytic H2 Evolution under Visible Light Irradiation

2004 ◽  
Vol 127 (3) ◽  
pp. 413-416 ◽  
Author(s):  
Ryu Abe ◽  
Kazuhiro Sayama ◽  
Hideki Sugihara
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Energy Gap ◽  
Light Irradiation ◽  
Acetonitrile Solution ◽  
H2 Evolution ◽  
Tio2 Photocatalysts ◽  
Dye Sensitized ◽  
Highest Occupied Molecular Orbital ◽  
Splitting System

H 2 production in a water-acetonitrile solution containing iodide as an electron donor was investigated over dye-sensitized Pt∕TiO2 photocatalysts under visible light irradiation, as a potential water-splitting system based on an iodide redox mediator. The rates of H2 evolution decreased with increasing proportion of water in the solutions, because of a decrease in the energy gap between the redox potential of I3−∕I− and the highest occupied molecular orbital levels of the dyes, which decreases the efficiency of electron transfer from I− to dye.

Construction of highly dispersed Nd2O3 nanoparticles onto mesoporous LaNaTaO3 nanocomposites for H2 evolution

2020 ◽  
Vol 400 ◽  
pp. 112723 ◽  
Author(s):  
Reda M. Mohamed ◽  
Adel. A. Ismail ◽  
Amal. S. Basaleh ◽  
Huda A. Bawazir
Keyword(s):  
H2 Evolution ◽  
Highly Dispersed

Engineering a highly dispersed co-catalyst on a few-layered catalyst for efficient photocatalytic H2 evolution: a case study of Ni(OH)2/HNb3O8 nanocomposites

2017 ◽  
Vol 7 (23) ◽  
pp. 5662-5669 ◽  
Author(s):  
Yuzhou Xia ◽  
Weihang Chen ◽  
Shijing Liang ◽  
Jinhong Bi ◽  
Ling Wu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
H2 Evolution ◽  
Co Catalyst ◽  
Highly Dispersed ◽  
Photocatalytic H2 Evolution ◽  
Layered Catalyst

Ni(OH)2 has been highly dispersed on HNb3O8 nanosheets and the composites exhibited greatly enhanced photocatalytic activity.

scholarly journals Photocatalytic H2 Production from Naphthalene by Various TiO2 Photocatalysts: Impact of Pt Loading and Formation of Intermediates

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 107
Author(s):  
Osama Al-Madanat ◽  
Yamen AlSalka ◽  
Ralf Dillert ◽  
Detlef Bahnemann
Keyword(s):  
Photocatalytic Activity ◽  
Formation Rate ◽  
Physicochemical Characterization ◽  
Strong Relationship ◽  
H2 Production ◽  
H2 Evolution ◽  
Fractional Conversion ◽  
Tio2 Photocatalysts ◽  
Carrier Separation ◽  
H2 Formation

This work presents a comparative study of the efficiency of two commercial TiO2 photocatalysts, Aeroxide P25 (ATiO2) and Sachtleben Hombikat UV100 (HTiO2), in H2 production from an aqueous solution of naphthalene. The TiO2 photocatalysts were platinized by the photodeposition method varying the platinum content of the suspension to 0.5, 1.0, and 5.0 wt%. A full physicochemical characterization for these materials was performed, showing no structural effects from the deposition method, and confirming a well dispersion of nanosized-Pt0 particles on the surface of both photocatalysts. Pristine ATiO2 shows around 14% higher photocatalytic fractional conversion of naphthalene than pristine HTiO2 after 240 min of irradiation, while both materials exhibit negligible activity for H2 formation. The 0.5 wt% Pt- HTiO2 increases the photocatalytic fractional conversion of naphthalene from 71% to 82% and produces 6 µmol of H2. However, using a higher Pt content than the optimal platinization ratio of 0.5 wt% dramatically inhibits both processes. On the other hand, regardless of the fractional ratio of Pt, the platinization of ATiO2 results in a decrease in the fractional conversion of naphthalene by 4% to 33% of the pristine value. Although the presence of Pt islands on the surface of the ATiO2 is essential for the H2 evolution, no dependency between the Pt ratio and the H2 formation rate was observed since all the platinized materials show a similar H2 formation of around 3 µmol. Based on the EPR results, the higher photocatalytic activity of the Pt-HTiO2 is attributed to the efficient charge carrier separation and its larger surface area. The recyclability test confirms that the inhibition of the photocatalytic process is related to the deactivation of the photocatalyst surface by the adsorption of the photoformed intermediates. A strong relationship between the photocatalytic activity and the kind of the aromatic compounds was observed. The H2 evolution and the photooxidation of the aromatic hydrocarbons exhibit higher photonic efficiencies than that of their corresponding hydroxylated compounds over the Pt-HTiO2.

Highly dispersed MnOx–FeOx supported by silicalite-1 for the selective catalytic reduction of NOx with NH3 at low temperatures

2020 ◽  
Vol 10 (16) ◽  
pp. 5525-5534 ◽  
Author(s):  
Jialiang Gu ◽  
Bingjun Zhu ◽  
Rudi Duan ◽  
Yan Chen ◽  
Shaoxin Wang ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Low Temperatures ◽  
Catalytic Reduction ◽  
Highly Dispersed ◽  
Reduction Of Nox

MnOx–FeOx-Loaded silicalite-1 catalysts exhibit high NOx conversion at low temperatures.

Interlayer confinement synthesis of Ir nanodots/dual carbon as an electrocatalyst for overall water splitting

2020 ◽  
Author(s):  
Yaru Li ◽  
Yu-Quan Zhu ◽  
Weili Xin ◽  
Song Hong ◽  
Xiaoying Zhao ◽  
...  
Keyword(s):  
Water Splitting ◽  
Noble Metal ◽  
High Efficiency ◽  
Overall Water Splitting ◽  
Highly Dispersed

Rationally designing low-content and high-efficiency noble metal nanodots offers opportunities to enhance electrocatalytic performances for water splitting. However, the preparation of highly dispersed nanodots electrocatalysts remains a challenge. Herein, we...

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