Superior solar-to-hydrogen energy conversion efficiency by visible light-driven hydrogen production via highly reduced Ti2+/Ti3+ states in a blue titanium dioxide photocatalyst

2018 ◽  
Vol 8 (18) ◽  
pp. 4657-4664 ◽  
Author(s):  
Nuwan Lakshitha De Silva ◽  
A. C. A. Jayasundera ◽  
A. Folger ◽  
O. Kasian ◽  
S. Zhang ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Hydrogen Production ◽  
Visible Light ◽  
Energy Conversion ◽  
Production System ◽  
Energy Conversion Efficiency ◽  
Hydrogen Energy ◽  
Visible Light Driven ◽  
Catalytic Hydrogen ◽  
Ir Light

A catalytic hydrogen production system was developed with TiO2 that contains Ti3+/Ti2+ reduced states which act as both visible and IR light harvesting components as well as the catalytic site.

scholarly journals Concurrent photocatalytic hydrogen production and organic degradation by a composite catalyst film in a two-chamber photo-reactor

2013 ◽  
Vol 67 (12) ◽  
pp. 2845-2849 ◽  
Author(s):  
Xi Wang ◽  
Xiao-yan Li
Keyword(s):  
Hydrogen Production ◽  
Visible Light ◽  
Layer Structure ◽  
Energy Conversion Efficiency ◽  
Cathode Side ◽  
Composite Catalyst ◽  
Organic Degradation ◽  
Photocatalytic Hydrogen Production ◽  
Catalyst Film ◽  
Visible Light Driven

A novel visible light-driven photocatalyst film, MoS2/Ag/TiO2, was synthesized on a glass-fiber membrane. The composite catalyst film had a multi-layer structure with Ag as nanoconjunctions between the MoS2 and TiO2 layers. The catalyst film performed well for both photocatalytic hydrogen production and organic degradation in a two-chamber photo-reactor under either solar or visible light. Hydrogen was produced in the cathode side chamber while the model organic was decomposed in the anode side chamber. The specific hydrogen production rate went through a maximum of 85 mmol/m2-h with an energy conversion efficiency of 0.85%, while the maximum specific organic carbon removal for formic acid under solar light reached 1,520 mg/m2-h. It is apparent that Ag between the TiO2 and MoS2 layers allowed the transfer of photo-excited electrons via TiO2 → Ag → MoS2 for organic degradation and H+ reduction (e.g. hydrogen evolution) in two different chambers.

scholarly journals Experimental study on the effects of light intensity on energy conversion efficiency of photo-thermo chemical synergetic catalytic water splitting

2018 ◽  
Vol 22 (Suppl. 2) ◽  
pp. 709-718
Author(s):  
Ziming Cheng ◽  
Ruitian Yu ◽  
Fuqiang Wang ◽  
Huaxu Liang ◽  
Bo Lin ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Light Intensity ◽  
Energy Conversion ◽  
Water Splitting ◽  
Energy Conversion Efficiency ◽  
Hydrogen Energy ◽  
Optical Losses ◽  
Full Spectrum ◽  
Solar Water ◽  
Solar Water Splitting

Hydrogen production from water using a catalyst and solar energy was an ideal future fuel source. In this study, an elaborate experimental test rig of hydrogen production from solar water splitting was designed and established with self- controlled temperature system. The effects of light intensity on the reaction rate of hydrogen production from solar water splitting were experimentally investigated with the consideration of optical losses, reaction temperature, and photocatalysts powder cluster. Besides, a revised expression of full-spectrum solar-to-hydrogen energy conversion efficiency with the consideration of optical losses was also put forward, which can be more accurate to evaluate the full-spectrum solar-to-hydrogen energy of photo-catalysts powders. The results indicated that optical losses of solar water splitting reactor increased with the increase of the incoming light intensity, and the hydrogen production rate increased linearly with the increase of effective light intensity even at higher light intensity region when the optical losses of solar water splitting reactor were considered.

Photobiological Hydrogen Production in a Flat Panel Photobioreactor Using Different Nutrient Media

2007 ◽  
Author(s):  
Halil Berberoglu ◽  
Laurent Pilon ◽  
Jenny Jay
Keyword(s):  
Carbon Dioxide ◽  
Hydrogen Production ◽  
Energy Conversion ◽  
Energy Conversion Efficiency ◽  
Biomass Energy ◽  
Hydrogen Energy ◽  
Production Rates ◽  
Flat Panel ◽  
Stage 1 ◽  
Dry Cell

This study reports a factor 5.5 increase in hydrogen production of Anabaena variabilis ATCC 29413 using Allen-Arnon medium compared with BG-11 and BG-110 media. The results were obtained with a flat panel photobioreactor made of acrylic and operated in two stages at 30°C. Stage 1 aims at converting carbon dioxide into biomass by photosynthesis while Stage 2 aims at producing hydrogen. During Stage 1, the photobioreactor is irradiated with 65 μmol/m2/s of light and sparged with a mixture of air and carbon dioxide. During Stage 2, irradiance is increased to 150 μmol/m2/s and the photobioreactor is sparged with pure argon. The parameters continuously monitored are (1) the cyanobacteria concentration, (2) the pH, (3) the dissolved oxygen concentration, (4) the nitrate and (5) the ammonia concentrations in the medium, and (6) the hydrogen concentration in the effluent gas. The three media BG-11, BG-110, and Allen-Arnon are tested under otherwise similar conditions. The light to biomass energy conversion efficiency varied between 5.5 and 10.5% and was similar for all media. The cyanobacteria concentrations during Stage 2 were 1.10 and 1.17 kg dry cell/m3 with BG-11 and Allen-Arnon media, respectively, while it could not exceed 0.76 kg dry cell/m3 with medium BG-110. The average specific hydrogen production rates were about 1 and 0.9 L/kg dry cell/h in media BG-11 and BG-110, respectively. In contrast, it was about 5.6 L/kg dry cell/h in Allen-Arnon medium. The maximum light to hydrogen energy conversion efficiencies achieved were 0.26%, 0.16%, and 1.32% for BG-11, BG-110, and Allen-Arnon media, respectively. The larger specific hydrogen production rates, efficiencies, and cyanobacteria concentrations achieved using Allen-Arnon medium are attributed to the presence of vanadium, and higher concentrations of molybdenum, magnesium, calcium, sodium, and potassium in the medium.

scholarly journals Development of Visible-Light-Driven Rh–TiO2–CeO2 Hybrid Photocatalysts for Hydrogen Production

Catalysts ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 848
Author(s):  
Jong-Wook Hong
Keyword(s):  
Hydrogen Production ◽  
Visible Light ◽  
Light Absorption ◽  
Photocatalytic Performance ◽  
Environmental Issues ◽  
Absorption Efficiency ◽  
Low Light ◽  
Practical Applications ◽  
Visible Light Driven ◽  
Poor Stability

Visible-light-driven hydrogen production through photocatalysis has attracted enormous interest owing to its great potential to address energy and environmental issues. However, photocatalysis possesses several limitations to overcome for practical applications, such as low light absorption efficiency, rapid charge recombination, and poor stability of photocatalysts. Here, the preparation of efficient noble metal–semiconductor hybrid photocatalysts for photocatalytic hydrogen production is presented. The prepared ternary Rh–TiO2–CeO2 hybrid photocatalysts exhibited excellent photocatalytic performance toward the hydrogen production reaction compared with their counterparts, ascribed to the synergistic combination of Rh, TiO2, and CeO2.

Enhanced Visible-Light-Driven Hydrogen Production through MOF/MOF Heterojunctions

2021 ◽  
Author(s):  
Stavroula Kampouri ◽  
Fatmah M. Ebrahim ◽  
Maria Fumanal ◽  
Makenzie Nord ◽  
Pascal A. Schouwink ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Visible Light ◽  
Visible Light Driven
Sign in / Sign up

Export Citation Format

Share Document