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.

scholarly journals Sequential cocatalyst decoration on BaTaO2N towards highly-active Z-scheme water splitting

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Zheng Wang ◽  
Ying Luo ◽  
Takashi Hisatomi ◽  
Junie Jhon M. Vequizo ◽  
Sayaka Suzuki ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Water Splitting ◽  
Energy Conversion Efficiency ◽  
Hydrogen Energy ◽  
Apparent Quantum Yield ◽  
Intimate Contact ◽  
Single Crystalline ◽  
Highly Active ◽  
Uniform Dispersion ◽  
Solar Hydrogen Production

AbstractOxynitride photocatalysts hold promise for renewable solar hydrogen production via water splitting owing to their intense visible light absorption. Cocatalyst loading is essential for activation of such oxynitride photocatalysts. However, cocatalyst nanoparticles form aggregates and exhibit weak interaction with photocatalysts, which prevents eliciting their intrinsic photocatalytic performance. Here, we demonstrate efficient utilization of photoexcited electrons in a single-crystalline particulate BaTaO2N photocatalyst prepared with the assistance of RbCl flux for H2 evolution reactions via sequential decoration of Pt cocatalyst by impregnation-reduction followed by site-selective photodeposition. The Pt-loaded BaTaO2N photocatalyst evolves H2 over 100 times more efficiently than before, with an apparent quantum yield of 6.8% at the wavelength of 420 nm, from a methanol aqueous solution, and a solar-to-hydrogen energy conversion efficiency of 0.24% in Z-scheme water splitting. Enabling uniform dispersion and intimate contact of cocatalyst nanoparticles on single-crystalline narrow-bandgap particulate photocatalysts is a key to efficient solar-to-chemical energy conversion.

Recent theoretical progress in the development of photoanode materials for solar water splitting photoelectrochemical cells

2015 ◽  
Vol 3 (20) ◽  
pp. 10632-10659 ◽  
Author(s):  
Mahesh Datt Bhatt ◽  
Jae Sung Lee
Keyword(s):  
Energy Conversion ◽  
Water Splitting ◽  
Environmentally Friendly ◽  
Photoelectrochemical Cells ◽  
Important Goal ◽  
Solar Water ◽  
Solar Water Splitting ◽  
Energy Conversion And Storage ◽  
Earth Abundant ◽  
And Storage

The search for earth-abundant materials that can be used in solar water splitting cells remains an important goal for affordable and environmentally friendly methods for energy conversion and storage.

Ferrites: emerging light absorbers for solar water splitting

2020 ◽  
Vol 8 (19) ◽  
pp. 9447-9482 ◽  
Author(s):  
Jeong Hun Kim ◽  
Hyo Eun Kim ◽  
Jin Hyun Kim ◽  
Jae Sung Lee
Keyword(s):  
Water Splitting ◽  
Hydrogen Energy ◽  
Solar Water ◽  
Solar Water Splitting ◽  
Light Absorbers

Ferrites are promising photoelectrode materials for solar water splitting to produce clean and storable hydrogen energy.

Hierarchical Ti1−xZrxO2−y nanocrystals with exposed high energy facets showing co-catalyst free solar light driven water splitting and improved light to energy conversion efficiency

2017 ◽  
Vol 5 (33) ◽  
pp. 17341-17351 ◽  
Author(s):  
Shreyasi Chattopadhyay ◽  
Swastik Mondal ◽  
Goutam De
Keyword(s):  
Solar Energy ◽  
Energy Conversion ◽  
Single Crystals ◽  
Water Splitting ◽  
Conversion Efficiency ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
Co Catalyst ◽  
Solar Water Splitting ◽  
Catalyst Free

Ti1−xZrxO2−y single crystals with exposed high energy facets and defects show co-catalyst free solar water splitting and high solar energy conversion in DSSCs.

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