scholarly journals NANOTECHNOLOGY MATERIALS FOR SOLAR ENERGY CONVERSION

2013 ◽  
Vol 4 (2) ◽  
Author(s):  
Svetlana Pelemiš ◽  
Igor Hut
Keyword(s):  
Hydrogen Production ◽  
Solar Energy ◽  
Energy Conversion ◽  
Production Technology ◽  
Energy Production ◽  
Scientific Community ◽  
Sustainable Energy ◽  
Solar Energy Conversion ◽  
Common Word ◽  
Paper Briefly

Nanotechnology is a common word these days, although only 15 years ago it was a quite obscure term used almost exclusively in scientific community. It is a fact that nanotechnology is widely present today with numerous applications, especially regarding novel materials. This is a technology that draws a lot of attention not only in the scientific community but also among investors, governments and industry. There is a great deal of expectations connected with it and especially, amongst others, concerning sustainable energy production. This paper briefly explores some of possible implementations of nanotechnology for new and improved energy conversion methods, considering a need for this to be done without doing harm to our environment. Focus is placed on advanced photovoltaic and hydrogen production technology.

Spatial distribution of active sites on a ferroelectric PbTiO3 photocatalyst for photocatalytic hydrogen production

2017 ◽  
Vol 198 ◽  
pp. 463-472 ◽  
Author(s):  
Rengui Li ◽  
Yue Zhao ◽  
Can Li
Keyword(s):  
Spatial Distribution ◽  
Hydrogen Production ◽  
Solar Energy ◽  
Energy Conversion ◽  
Electric Fields ◽  
Charge Separation ◽  
Active Sites ◽  
Solar Energy Conversion ◽  
Photogenerated Electrons ◽  
The Right

The separation of photogenerated charge carries is a challenging issue in artificial photocatalyst systems for solar energy conversion. It has been reported that spatial charge separation can take place between different facets of semiconductor-based crystals with regular morphology and facets, which could be used to rationally deposit cocatalysts on the right facets. However, the spatial separation of photogenerated electrons and holes is still a big challenge for a particulate photocatalyst without regular morphology and specific facets. In this work, we demonstrated that photogenerated electrons and holes can be regularly separated on ferroelectric PbTiO3 photocatalyst even without regular morphology and facets. The reduction cocatalyst and oxidation cocatalyst could be selectively formed on different sites via an in situ photochemical deposition method. It is found that the photoactivity and hydrogen production for PbTiO3 with spatially separated dual-cocatalysts is remarkably enhanced to more than 100 times greater compared to native PbTiO3, which is much higher than that the case of dual-cocatalysts with a random distribution. The intrinsic electric fields and spontaneous electric polarization in the bulk of PbTiO3 are proposed to play important roles in the spatial distribution of active sites on irregular PbTiO3 particles. Our work emphasizes the essential roles of two important factors, efficient charge separation strategy and the location of dual-cocatalysts on the right sites, to construct integrated artificial photocatalyst systems for solar energy conversion.

scholarly journals Correction: Elucidation of photovoltage origin and charge transport in Cu2O heterojunctions for solar energy conversion

2019 ◽  
Vol 3 (10) ◽  
pp. 2873-2874
Author(s):  
Peter Cendula ◽  
Matthew T. Mayer ◽  
Jingshan Luo ◽  
Michael Grätzel
Keyword(s):  
Solar Energy ◽  
Energy Conversion ◽  
Charge Transport ◽  
Sustainable Energy ◽  
Solar Energy Conversion

Correction for ‘Elucidation of photovoltage origin and charge transport in Cu2O heterojunctions for solar energy conversion’ by Peter Cendula et al., Sustainable Energy Fuels, 2019, DOI: 10.1039/c9se00385a.

scholarly journals Maximizing Hydrogen Production by Cyanobacteria

2008 ◽  
Vol 63 (3-4) ◽  
pp. 226-232 ◽  
Author(s):  
Hermann Bothe ◽  
Stefanie Winkelmann ◽  
Gudrun Boison
Keyword(s):  
Energy Source ◽  
Hydrogen Production ◽  
Solar Energy ◽  
Energy Conversion ◽  
Molecular Hydrogen ◽  
Solar Energy Conversion ◽  
Clean Energy ◽  
Anabaena Variabilis ◽  
High Concentrations ◽  
Clean Energy Source

When incubated anaerobically, in the light, in the presence of C2H2 and high concentrations of H2, both Mo-grown Anabaena variabilis and either Mo- or V-grown Anabaena azotica produce large amounts of H2 in addition to the H2 initially added. In contrast, C2H2- reduction is diminished under these conditions. The additional H2-production mainly originates from nitrogenase with the V-enzyme being more effective than the Mo-protein. This enhanced H2-production in the presence of added H2 and C2H2 should be of interest in approaches to commercially exploit solar energy conversion by cyanobacterial photosynthesis for the generation of molecular hydrogen as a clean energy source

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