Enhanced hydrogen photogeneration by bulk g-C3N4 through a simple and efficient oxidation route

2018 ◽  
Vol 47 (19) ◽  
pp. 6772-6778 ◽  
Author(s):  
Ambra Pisanu ◽  
Andrea Speltini ◽  
Barbara Vigani ◽  
Franca Ferrari ◽  
Matteo Mannini ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Visible Light ◽  
Production Rate ◽  
Oxidation Process ◽  
Hydrogen Production Rate

The hydrogen production rate under visible light of bulk g-C3N4 has been improved 8-fold by a simple oxidation process.

Three-dimensional MoS2–CdS–γ-TaON hollow composites for enhanced visible-light-driven hydrogen evolution

2014 ◽  
Vol 50 (14) ◽  
pp. 1731-1734 ◽  
Author(s):  
Zheng Wang ◽  
Jungang Hou ◽  
Chao Yang ◽  
Shuqiang Jiao ◽  
Hongmin Zhu
Keyword(s):  
Hydrogen Production ◽  
Visible Light ◽  
Production Rate ◽  
Hydrothermal Method ◽  
Hydrogen Evolution ◽  
Three Dimensional ◽  
Hydrogen Production Rate ◽  
Facile Hydrothermal Method ◽  
Hollow Nanostructures ◽  
Visible Light Driven

Three-dimensional MoS2–CdS–γ-TaON hollow nanostructures as novel photocatalysts were firstly synthesized via a facile hydrothermal method and they exhibit a high photocatalytic hydrogen production rate without a noble metal.

Silver nanoparticles embedded 2D g-C3N4 nanosheets toward excellent photocatalytic hydrogen evolution under visible light

2022 ◽  
Author(s):  
Xiyu Deng ◽  
Xinya Kuang ◽  
Jiyang Zeng ◽  
Baoye Zi ◽  
Yiwen Ma ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Visible Light ◽  
Production Rate ◽  
Ag Nanoparticles ◽  
High Performance ◽  
Resonance Effect ◽  
Hydrothermal Process ◽  
Hydrogen Production Rate ◽  
Characterization Methods ◽  
Excellent Activity

Abstract Photocatalytic water splitting is considered to be a feasible method to replace traditional energy. However, most of the catalysts have unsatisfactory performance. In this work, we used a hydrothermal process to grow Ag nanoparticles in situ on g-C3N4 nanosheets, and then a high performance catalyst (Ag- g-C3N4) under visible light was obtained. The Ag nanoparticles obtained by this process are amorphous and exhibit excellent catalytic activity. At the same time, the local plasmon resonance effect of Ag can effectively enhance the absorption intensity of visible light by the catalyst. The hydrogen production rate promote to 1035 μmol g-1h-1 after loaded 0.6 wt% of Ag under the visible light, which was 313 times higher than that of pure g-C3N4 (3.3μmol g-1h-1). This hydrogen production rate is higher than most previously reported catalysts which loaded with Ag or Pt. The excellent activity of Ag- g-C3N4 is benefited from the Ag nanoparticles and special interaction in each other. Through various analysis and characterization methods, it is shown that the synergy between Ag and g-C3N4 can effectively promote the separation of carriers and the transfer of electrons. Our work proves that Ag- g-C3N4 is a promising catalyst to make full use of solar energy.

Photocatalytic hydrogen generation from water under visible light using core/shell nano-catalysts

2010 ◽  
Vol 61 (9) ◽  
pp. 2303-2308 ◽  
Author(s):  
X. Wang ◽  
K. Shih ◽  
X. Y. Li
Keyword(s):  
Hydrogen Production ◽  
Visible Light ◽  
Production Rate ◽  
Hydrogen Generation ◽  
Nano Particles ◽  
Catalyst Loading ◽  
Core Shell ◽  
Hydrogen Production Rate ◽  
Photocatalytic Hydrogen Generation ◽  
Nano Catalysts

A microemulsion technique was employed to synthesize nano-sized photocatalysts with a core (CdS)/shell (ZnS) structure. The primary particles of the photocatalysts were around 10 nm, and the mean size of the catalyst clusters in water was about 100 nm. The band gaps of the catalysts ranged from 2.25 to 2.46 eV. The experiments of photocatalytic H2 generation showed that the catalysts (CdS)x/(ZnS)1−x with x ranging from 0.1 to 1 were able to produce hydrogen from water photolysis under visible light. The catalyst with x = 0.9 had the highest rate of hydrogen production. The catalyst loading density also influenced the photo-hydrogen production rate, and the best catalyst concentration in water was 1 g L−1. The stability of the nano-catalysts in terms of size, morphology and activity was satisfactory during an extended test period for a specific hydrogen production rate of 2.38 mmol g−1 L−1 h−1 and a quantum yield of 16.1% under visible light (165 W Xe lamp, λ > 420 nm). The results demonstrate that the (CdS)/(ZnS) core/shell nano-particles are a novel photo-catalyst for renewable hydrogen generation from water under visible light. This is attributable to the large band-gap ZnS shell that separates the electron/hole pairs generated by the CdS core and hence reduces their recombinations.

scholarly journals Preparation of High Activity Ga and Cu Doped ZnS by Hydrothermal Method for Hydrogen Production under Visible Light Irradiation

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Melody Kimi ◽  
Leny Yuliati ◽  
Mustaffa Shamsuddin
Keyword(s):  
Photocatalytic Activity ◽  
Hydrogen Production ◽  
Visible Light ◽  
Production Rate ◽  
Hydrothermal Method ◽  
Visible Light Irradiation ◽  
Photocatalytic Property ◽  
Light Irradiation ◽  
Hydrogen Production Rate ◽  
Cu Doping

Ga(0.1),Cu(x)-ZnS (x=0.01, 0.03, 0.05) photocatalysts were successfully synthesized by hydrothermal method. The synthesized Ga and Cu codoped ZnS photocatalysts showed photocatalytic property effective for hydrogen production from aqueous solution containing Na2SO3and Na2S as sacrificial reagent under visible light irradiation. The rate of hydrogen production was found to be strongly dependent on Cu doping content. The highest photocatalytic activity is observed for Ga(0.1),Cu(0.01)-ZnS with hydrogen production rate of 114 µmol/h. The addition of Ga as codoped increased the photocatalytic activity to 58 times as compared to single doped Cu-ZnS. The Ga and Cu codoped ZnS photocatalysts are also stable under long irradiation. The enhancement in the photocatalytic activity of Ga and Cu codoped photocatalyst can be attributed to the synergistic effect between Ga and Cu. The photocatalytic activity was greatly enhanced with the addition of 0.5 wt% Ru as cocatalyst with a hydrogen production rate of 744 µmol/h.

Photocatalytic hydrogen production of the CdS/TiO2-WO3 ternary hybrid under visible light irradiation

2015 ◽  
Vol 73 (7) ◽  
pp. 1667-1672 ◽  
Author(s):  
Yi-Lin Chen ◽  
Shang-Lien Lo ◽  
Hsiang-Ling Chang ◽  
Hsiao-Mei Yeh ◽  
Liping Sun ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Visible Light ◽  
Production Rate ◽  
Water Splitting ◽  
Visible Light Irradiation ◽  
Platinum Metal ◽  
Light Irradiation ◽  
Hydrogen Energy ◽  
Hydrogen Production Rate ◽  
Photocatalytic Hydrogen Production

An attractive and effective method for converting solar energy into clean and renewable hydrogen energy is photocatalytic water splitting over semiconductors. The study aimed at utilizing organic sacrificial agents in water, modeled by formic acid, in combination with visible light driven photocatalysts to produce hydrogen with high efficiencies. The photocatalytic hydrogen production of cadmium sulfide (CdS)/titanate nanotubes (TNTs) binary hybrid with specific CdS content was investigated. After visible light irradiation for 3 h, the hydrogen production rate of 25 wt% CdS/TNT achieved 179.35 μmol·h−1. Thanks to the two-step process, CdS/TNTs-WO3 ternary hybrid can better promote the efficiency of water splitting compared with CdS/TNTs binary hybrid. The hydrogen production of 25 wt% CdS/TNTs-WO3 achieved 212.68 μmol·h−1, under the same condition. Coating of platinum metal onto the WO3 could further promote the reaction. Results showed that 0.2 g 0.1 wt% Pt/WO3 + 0.2 g 25 wt% CdS/TNTs had the best hydrogen production rate of 428.43 μmol·h−1. The resultant materials were well characterized by high-resolution transmission electron microscope, X-ray diffraction, scanning electron microscopy, and UV-Vis spectra.

O-MoS2/Mn0.5Cd0.5S composites with enhanced activity for visible-light-driven photocatalytic hydrogen evolution

2020 ◽  
Vol 10 (15) ◽  
pp. 5298-5305
Author(s):  
Xuanxuan Yang ◽  
Yu Guo ◽  
Yongbing Lou ◽  
Jinxi Chen
Keyword(s):  
Reaction Mechanism ◽  
Hydrogen Production ◽  
Visible Light ◽  
Production Rate ◽  
Hydrogen Evolution ◽  
Hydrogen Production Rate ◽  
Photocatalytic Hydrogen Evolution ◽  
Enhanced Activity ◽  
Visible Light Driven

The reaction mechanism of O-MoS2/Mn0.5Cd0.5S for photocatalytic hydrogen evolution is put forward and the satisfactory hydrogen production rate of the optimized composite is superior to most of the Mn–Cd–S based catalysts reported.

Amino group promoted photocatalytic hydrogen evolution activity observed in two copper(ii)-based layered complexes

2018 ◽  
Vol 47 (36) ◽  
pp. 12726-12733 ◽  
Author(s):  
Lei Li ◽  
Shuang Zhu ◽  
Rui Hao ◽  
Jia-Jun Wang ◽  
En-Cui Yang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Hydrogen Production ◽  
Visible Light ◽  
Production Rate ◽  
Water Splitting ◽  
Visible Light Irradiation ◽  
Amino Group ◽  
Group Effect ◽  
Hydrogen Production Rate ◽  
Layered Complex

The amino group effect of the photocatalyst on the catalytic activity of water splitting was investigated under visible light irradiation. The hydrogen production rate of the amino group modified layered complex is almost double that without the amino group.

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