Scalable water splitting on particulate photocatalyst sheets with a solar-to-hydrogen energy conversion efficiency exceeding 1%

2016 ◽  
Vol 15 (6) ◽  
pp. 611-615 ◽  
Author(s):  
Qian Wang ◽  
Takashi Hisatomi ◽  
Qingxin Jia ◽  
Hiromasa Tokudome ◽  
Miao Zhong ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Water Splitting ◽  
Conversion Efficiency ◽  
Energy Conversion Efficiency ◽  
Hydrogen Energy

Integrating a redox flow battery into a Z-scheme water splitting system for enhancing the solar energy conversion efficiency

2019 ◽  
Vol 12 (2) ◽  
pp. 631-639 ◽  
Author(s):  
Zhen Li ◽  
Wangyin Wang ◽  
Shichao Liao ◽  
Mingyao Liu ◽  
Yu Qi ◽  
...  
Keyword(s):  
Solar Energy ◽  
Energy Conversion ◽  
Water Splitting ◽  
Conversion Efficiency ◽  
Solar Energy Conversion ◽  
Energy Conversion Efficiency ◽  
Hydrogen Energy ◽  
Redox Flow Battery ◽  
Solar Energy Conversion Efficiency ◽  
Splitting System

A RFB-integrated Z-scheme water splitting system produces hydrogen energy and electricity for efficient solar energy conversion.

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.

Hierarchical Sheet-on-Sheet Heterojunction Array of β-Ni(OH)2/Fe(OH)3 Self-Supporting Anode for Effective Overall Alkaline Water Splitting

2021 ◽  
Author(s):  
Baoqiang Wu ◽  
Zhaohui Yang ◽  
Xiaoping Dai ◽  
Xueli Yin ◽  
Yonghao Gan ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Water Splitting ◽  
Noble Metal ◽  
Conversion Efficiency ◽  
High Performance ◽  
Energy Conversion Efficiency ◽  
Alkaline Water ◽  
Supporting Anode

Rationally designing high-performance non-noble metal electrocatalyst is of essence to improve energy conversion efficiency in water splitting. Herein, an unique 3D hierarchical sheet-on-sheet heterojunction between Fe(OH)3 and β-Ni(OH)2 on pretreated...

A MoSSe/blue phosphorene vdw heterostructure with energy conversion efficiency of 19.9% for photocatalytic water splitting

2020 ◽  
Vol 35 (12) ◽  
pp. 125008
Author(s):  
Yi Luo ◽  
Sake Wang ◽  
Huabing Shu ◽  
Jyh-Pin Chou ◽  
Kai Ren ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Water Splitting ◽  
Conversion Efficiency ◽  
Energy Conversion Efficiency ◽  
Photocatalytic Water Splitting ◽  
Vdw Heterostructure ◽  
Blue Phosphorene

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.

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.

Symbiotic Cultures for Increasing the Solar Energy Conversion Efficiency of Outdoor Photobioreactors

2009 ◽  
Author(s):  
Halil Berberog˘lu ◽  
Laurent Pilon
Keyword(s):  
Solar Energy ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
Solar Energy Conversion ◽  
Energy Conversion Efficiency ◽  
Incident Radiation ◽  
Hydrogen Energy ◽  
Radiation Characteristics ◽  
Photochemical Process ◽  
Solar Energy Conversion Efficiency

A numerical study is presented aiming to maximize the solar to hydrogen energy conversion efficiency of a symbiotic culture containing microorganisms with different absorption characteristics. The green algae Chlamydomonas reinhardtii CC125 and the purple non-sulfur bacteria Rhodobacter sphearoides ATCC 49419 are chosen for illustration purposes. The previously measured radiation characteristics of each microorganism are used as input parameters in the radiative transport equation for calculating the local spectral incident radiation within a flat panel photobioreactor. The specific hydrogen production rate for each microorganism as a function of the available incident radiation is recovered from data reported in the literature. The overall solar to hydrogen energy conversion efficiency of symbiotic cultures of varying microorganism concentrations have been computed for photobioreactor thicknesses from 1 to 10 cm. The results show that for a given photobioreactor thickness a saturation microorganism concentration exists above which the solar energy conversion efficiency does not increase. The maximum solar energy conversion efficiencies of solo cultures of C. reinhardtii and R. spaheroides at their respective saturation concentrations are 0.06 and 0.055%, respectively. Using symbiotic cultures, a total conversion efficiency of about 0.075% is achieved within the parameter range explored. It has been shown that the choice of microorganism concentrations for maximum solar energy conversion efficiency is non-trivial and requires careful radiation transfer analysis coupled with H2 production kinetics taking into account the photobioreactor thickness. The presented numerical tool can be used for simulating any photobiological or photochemical process involving more than one species with different radiation characteristics provided the closure laws for the reaction kinetics are known as a function of spectral incident radiation. Examples include (i) the symbiotic cultivation of more than one microorganism for biomass or lipid production in a photobioreactor and (ii) a photochemical reactor containing a number of absorbing and scattering photocatalysts with different band gaps.

scholarly journals TiO2 nanotubes with ultrathin walls for enhanced water splitting

2015 ◽  
Vol 51 (63) ◽  
pp. 12617-12620 ◽  
Author(s):  
Ahmad M. Mohamed ◽  
Amina S. Aljaber ◽  
Siham Y. AlQaradawi ◽  
Nageh K. Allam
Keyword(s):  
Solar Energy ◽  
Energy Conversion ◽  
Water Splitting ◽  
Conversion Efficiency ◽  
Wall Thickness ◽  
Tio2 Nanotubes ◽  
Solar Energy Conversion ◽  
Energy Conversion Efficiency ◽  
Solar Energy Conversion Efficiency

Nanotube wall thickness determines its solar energy conversion efficiency.

A 24.4% solar to hydrogen energy conversion efficiency by combining concentrator photovoltaic modules and electrochemical cells

2015 ◽  
Vol 8 (10) ◽  
pp. 107101 ◽  
Author(s):  
Akihiro Nakamura ◽  
Yasuyuki Ota ◽  
Kayo Koike ◽  
Yoshihide Hidaka ◽  
Kensuke Nishioka ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Conversion Efficiency ◽  
Energy Conversion Efficiency ◽  
Electrochemical Cells ◽  
Hydrogen Energy ◽  
Photovoltaic Modules

Over 12% Light to Hydrogen Energy Conversion Efficiency of Hydrogen Generation from Water: New System Concept, Concentrated Photovoltaic Electrochemical Cell (CPEC)

2013 ◽  
Vol 1491 ◽  
Author(s):  
Katsushi Fujii ◽  
Shinichiro Nakamura ◽  
Kentaroh Watanabe ◽  
Behgol Bagheri ◽  
Masakazu Sugiyama ◽  
...  
Keyword(s):  
Energy Storage ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
Hydrogen Generation ◽  
Electrochemical Cell ◽  
Energy System ◽  
Energy Conversion Efficiency ◽  
Hydrogen Energy ◽  
Storage Technologies ◽  
And Storage

ABSTRACTEnergy storage is a key technology for establishing a stand-alone renewable energy system. Current energy-storage technologies are, however, not suitable for such an energy system. They are cost ineffective and/or are with low energy-conversion efficiency. Hydrogen generation and storage from water by sunlight is one of these technologies. In this study, a simple concept of hydrogen generation from water by using sunlight, “concentrated photovoltaic electrochemical cell (CPEC)” is proposed. It is experimentally shown that the CPEC operates stably and achieves conversion efficiency from light to hydrogen energy of over 12%.

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