scholarly journals Octahedral Shaped PbTiO3-TiO2 Nanocomposites for High-Efficiency Photocatalytic Hydrogen Production

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2295
Author(s):  
Simin Yin ◽  
Shun Liu ◽  
Yongfeng Yuan ◽  
Shaoyi Guo ◽  
Zhaohui Ren
Keyword(s):  
Hydrogen Production ◽  
High Efficiency ◽  
Uv Light ◽  
Evolution Rate ◽  
Tetrabutyl Titanate ◽  
H2 Evolution ◽  
Tio2 Nanocrystals ◽  
Photocatalytic Hydrogen Production ◽  
Alcohol Water ◽  
Vis Spectroscopy

In this work, octahedral shaped PbTiO3-TiO2 nanocomposites have been synthesized by a facile hydrothermal method, where perovskite ferroelectric PbTiO3 nanooctahedra were employed as substrate. The microstructures of the composites were investigated systemically by using XRD, SEM, TEM and UV-Vis spectroscopy. It was revealed that anantase TiO2 nanocrystals with a size of about 5 nm are dispersed on the surface of the {111} facets of the nanooctahedron crystals. Photocatalytic hydrogen production of the nanocomposites has been evaluated in a methanol alcohol-water solution under UV light enhanced irradiation. The H2 evolution rate of the nanocomposites increased with an increased loading of TiO2 on the nanooctahedra. The highest H2 evolution rate was 630.51 μmol/h with the highest concentration of TiO2 prepared with 2 mL tetrabutyl titanate, which was about 36 times higher than that of the octahedron substrate. The enhanced photocatalytic reactivity of the nanocomposites is possibly ascribed to the UV light absorption of the nanooctahedral substrates, efficient separation of photo-generated carriers via the interface and the reaction on the surface of the TiO2 nanocrystals.

scholarly journals Enhanced Photocatalytic Hydrogen Production of the Polyoxoniobate Modified with RGO and PPy

Nanomaterials ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2449
Author(s):  
Shiliang Heng ◽  
Lei Li ◽  
Weiwei Li ◽  
Haiyan Li ◽  
Jingyu Pang ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Active Sites ◽  
High Efficiency ◽  
Solvothermal Method ◽  
H2 Production ◽  
H2 Evolution ◽  
Co Catalyst ◽  
Photocatalytic Hydrogen Production ◽  
Reduced Graphene ◽  
One Step

The development of high-efficiency, recyclable, and inexpensive photocatalysts for water splitting for hydrogen production is of great significance to the application of solar energy. Herein, a series of graphene-decorated polyoxoniobate photocatalysts Nb6/PPy-RGO (Nb6 = K7HNb6O19, RGO = reduced graphene oxide, PPy = polypyrrole), with the bridging effect of polypyrrole were prepared through a simple one-step solvothermal method, which is the first example of polyoxoniobate-graphene-based nanocomposites. The as-fabricated photocatalyst showed a photocatalytic H2 evolution activity without any co-catalyst. The rate of 1038 µmol g−1 in 5 h under optimal condition is almost 43 times higher than that of pure K7HNb6O19·13H2O. The influencing factors for photocatalysts in photocatalytic hydrogen production under simulated sunlight were studied in detail and the feasible mechanism is presented in this paper. These results demonstrate that Nb6O19 acts as the main catalyst and electron donor, RGO provides active sites, and PPy acted as an electronic bridge to extend the lifetime of photo-generated carriers, which are crucial factors for photocatalytic H2 production.

Controllable design of double metal oxide (NiCo2O4)-modified CdS for efficient photocatalytic hydrogen production

2019 ◽  
Vol 21 (8) ◽  
pp. 4501-4512 ◽  
Author(s):  
Xian Yan ◽  
Zhiliang Jin ◽  
Yupeng Zhang ◽  
Hai Liu ◽  
Xiaoli Ma
Keyword(s):  
High Temperature ◽  
Hydrogen Production ◽  
Metal Oxide ◽  
Hydrothermal Method ◽  
High Efficiency ◽  
Composite Photocatalyst ◽  
Photocatalytic Hydrogen Production ◽  
High Temperature Calcination

In the present study, we have successfully synthesized a kind of high-efficiency NiCo2O4/CdS composite photocatalyst using the hydrothermal method and high-temperature calcination.

Fabrication of a novel Ni3N/Ni4N heterojunction as a non-noble metal co-catalyst to boost the H2 evolution efficiency of Zn0.5Cd0.5S

2020 ◽  
Vol 44 (8) ◽  
pp. 3471-3477 ◽  
Author(s):  
Zhanbin Jin ◽  
Tingting Wei ◽  
Fengyan Li ◽  
Qiu Zhang ◽  
Lin Xu
Keyword(s):  
Hydrogen Production ◽  
Noble Metal ◽  
H2 Evolution ◽  
Co Catalyst ◽  
Photocatalytic Hydrogen Production

NixN/Zn0.5Cd0.5S composites displayed better photocatalytic hydrogen production from water in comparison with pristine Zn0.5Cd0.5S (ZCS), as well as Pt/ZCS and Ni3N/ZCS.

Achieving an unprecedented hydrogen evolution rate by solvent-exfoliated CPP-based photocatalysts

2020 ◽  
Vol 8 (12) ◽  
pp. 5890-5899 ◽  
Author(s):  
Jing-Zhao Cheng ◽  
Li-Lin Liu ◽  
Guangfu Liao ◽  
Zhao-Qi Shen ◽  
Zhi-Rong Tan ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Hydrogen Evolution ◽  
Evolution Rate ◽  
Photocatalytic Hydrogen Production ◽  
Hydrogen Evolution Rate

Solvent-exfoliated CPP-based photocatalysts have been innovatively used for photocatalytic hydrogen production with an unprecedented HER of up to 303.7 mmol h−1 g−1.

Rare earth material CeO2 modified CoS2 nanospheres for efficient photocatalytic hydrogen evolution

2021 ◽  
Author(s):  
Lijun Ma ◽  
Jing Xu ◽  
Juan Zhang ◽  
Zhenlu Liu ◽  
Xinyu Liu
Keyword(s):  
Rare Earth ◽  
Hydrogen Production ◽  
Hydrogen Evolution ◽  
High Efficiency ◽  
Low Cost ◽  
H2 Evolution ◽  
Photocatalytic Hydrogen Evolution ◽  
Earth Material ◽  
Photocatalytic H2 Evolution

The development of high-efficiency and low-cost photocatalysts for hydrogen production reaction is very important to solve energy problems. This paper studied the photocatalytic H2 evolution activity of CeO2/CoS2 heterojunction catalyst...

scholarly journals Preparation and Characterization of Nanocrystalline TiO2 on Microsericite for High-Efficiency Photo-Energy Conversion of Methanol to Hydrogen

Crystals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 380 ◽  
Author(s):  
Huang ◽  
Wu ◽  
Nguyen ◽  
Nguyen
Keyword(s):  
Acetic Acid ◽  
Hydrogen Production ◽  
Energy Conversion ◽  
High Efficiency ◽  
Uv Light ◽  
Sol Gel ◽  
Nitrogen Adsorption ◽  
Absorption Spectrometry ◽  
Nanocrystalline Tio2 ◽  
Bet Theory

TiO2 and TiO2/sericite photocatalysts were successfully synthesized via the sol-gel method by adding a varying amount of acetic acid. The effect of acetic acid on TiO2 and TiO2/sericite photocatalysts was studied. The crystallite size, surface morphology, chemical composition, specific surface area, surficial functional groups, and light absorbance of the prepared photocatalysts were revealed by the analysis of X-ray diffraction (XRD), scanning electron microscope-energy dispersive spectrometry (SEM-EDS), nitrogen adsorption-desorption isotherms by using BET theory (Brunauer–Emmett–Teller), Fourier-transform infrared spectroscopy (FTIR), and UV-Vis absorption spectrometry. Photo-energy conversion of methanol to hydrogen was also conducted over the prepared photocatalysts. The best hydrogen production was achieved by using the TiO2/sericite photocatalyst to give a hydrogen production rate of 1424 μmol/g·h in 6 h of UV-light irradiation.

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