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Solar water splitting

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https://www.readbyqxmd.com/read/30548747/transparent-ta3n5-photoanodes-for-efficient-oxygen-evolution-toward-the-development-of-tandem-cells
#1
Tomohiro Higashi, Hiroshi Nishiyama, Yohichi Suzuki, Yutaka Sasaki, Takashi Hisatomi, Masao Katayama, Tsutomu Minegishi, Kazuhiko Seki, Taro Yamada, Kazunari Domen
Photoelectrochemical water splitting is regarded as a promising approach to the production of hydrogen, and the development of efficient photoelectrodes is one aspect of realizing practical systems. In this work, transparent Ta3N5 photoanodes were fabricated on n-type GaN/sapphire substrates to promote O2 evolution in tandem with a photocathode, to realize overall water splitting. Following the incorporation of an underlying GaN layer, a photocurrent of 6.3 mA cm-2 was achieved at 1.23 V vs. a reversible hydrogen electrode...
December 12, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/30548179/constructing-srtio%C3%A2-tio%C3%A2-heterogeneous-hollow-multi-shelled-structures-for-enhanced-solar-water-splitting
#2
Yanze Wei, Jiangyan Wang, Ranbo Yu, Jiawei Wan, Dan Wang
Constructing hollow multi-shelled structures (HoMSs) demonstrates significant effect on promoting light absorption property of catalysts and enhancing their performance in solar energy conversion applications. Perovskite SrTiO₃ photocatalyst exhibits giant potential in photocatalytic applications, but difficulties in controlling its morphology structure restrict the further enhancement in its light harvesting ability. Herein, we introduce a facile hydrothermal method to design the SrTiO₃-TiO₂ heterogeneous HoMSs by a hydrothermal crystallization of SrTiO₃ on the surface of the TiO₂ HoMSs, which will realize a full coverage of SrTiO₃ on the TiO₂ surface and construct the high-quality interface of SrTiO₃/TiO₂...
December 10, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/30547175/efficient-hydrogen-evolution-on-cuins-2-x-zns-1-x-solid-solution-based-photocathodes-under-simulated-sunlight
#3
Jiao Zhao, Tsutomu Minegishi, Hiroyuki Kaneko, Guijun Ma, Miao Zhong, Mamiko Nakabayashi, Takashi Hisatomi, Masao Katayama, Naoya Shibata, Taro Yamada, Kazunari Domen
A thin film of (CuInS2)x(ZnS)1-x has been developed as a photocathode for solar water splitting for the first time. A superior photoelectrochemical performance has been achieved, mainly attributed to the formation of a solid solution by CuInS2 and ZnS, which proved to be an effective strategy to improve the onset potential and efficiency of CuInS2 photocathodes.
December 14, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/30543407/the-middle-road-less-taken-electronic-structure-inspired-design-of-hybrid-photocatalytic-platforms-for-solar-fuel-generation
#4
Junsang Cho, Aaron Sheng, Nuwanthi Suwandaratne, Linda Wangoh, Justin L Andrews, Peihong Zhang, Louis F J Piper, David F Watson, Sarbajit Banerjee
The development of efficient solar energy conversion to augment other renewable energy approaches is one of the grand challenges of our time. Water splitting, or the disproportionation of H2 O into energy-dense fuels, H2 and O2 , is undoubtedly a promising strategy. Solar water splitting involves the concerted transfer of four electrons and four protons, which requires the synergistic operation of solar light harvesting, charge separation, mass and charge transport, and redox catalysis processes. It is unlikely that individual materials can mediate the entire sequence of charge and mass transport as well as energy conversion processes necessary for photocatalytic water splitting...
December 13, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/30537811/metal-oxide-oxy-hydroxide-overlayers-as-hole-collectors-and-oxygen-evolution-catalysts-on-water-splitting-photoanodes
#5
Forrest A L Laskowski, Michael R Nellist, Jingjing Qiu, Shannon W Boettcher
Solar-water-splitting provides a mechanism to convert and store solar energy in the form of stable chemical bonds. Water-splitting systems often include semiconductor photoanodes, such as n-Fe2O3 and n-BiVO4, which use photogenerated holes to oxidize water. These photoanodes often exhibit improved performance when coated with metal-oxide/(oxy)hydroxide overlayers that are catalytic for the water oxidation reaction. The mechanism for this improvement, however, remains a controversial topic. This is, in part, due to a lack of experimental techniques that are able to directly track the flow of photogenerated holes in such multicomponent systems...
December 11, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/30536475/guiding-principles-for-designing-highly-efficient-metal-free-carbon-catalysts
#6
REVIEW
Lipeng Zhang, Chun-Yu Lin, Detao Zhang, Lele Gong, Yonghao Zhu, Zhenghang Zhao, Quan Xu, Hejun Li, Zhenhai Xia
Carbon nanomaterials are promising metal-free catalysts for energy conversion and storage, but the catalysts are usually developed via traditional trial-and-error methods. To rationally design and accelerate the search for the highly efficient catalysts, it is necessary to establish design principles for the carbon-based catalysts. Here, theoretical analysis and material design of metal-free carbon nanomaterials as efficient photo-/electrocatalysts to facilitate the critical chemical reactions in clean and sustainable energy technologies are reviewed...
December 7, 2018: Advanced Materials
https://www.readbyqxmd.com/read/30516031/rationally-designed-copper-modified-polymeric-carbon-nitride-as-a-photocathode-for-solar-water-splitting
#7
Zhonghao Wang, Bingjun Jin, Guojun Zou, Kan Zhang, Xun Hu, Jong Hyeok Park
Polymeric carbon nitride has been considered an active photocathode for catalyzing H2 generation via water splitting. However, the application of the material in photoelectrochemical cells remains a challenge owing to the intrinsically sluggish kinetics of charge separation. Here, we developed a facile salt melt method for fabricating Cu-modified polymeric carbon nitride as an effective photocathode material for solar water splitting. Various characterization data confirm that Cu-modified polymeric carbon nitride contains both free CuCl derived from precursors and coordinated Cu species incorporated into the polymeric carbon nitride, which can generate type-II heterojunctions...
December 5, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30515988/recent-development-of-g-c3n4-based-hydrogels-as-photocatalysts-a-minireview
#8
Chechia Hu, Yan-Ru Lin, Hung-Chun Yang
Solar-driven photocatalysis using graphitic carbon nitride (g-C3N4) is considered the most promising approach for the generation of H2 from water, degradation of organic pollutants, and reduction of CO2. However, bulk g-C3N4 exhibits several drawbacks, such as low specific surface area, high defect density, and fast charge recombination, which result in low photocatalytic performance. Construction of 3D porous hydrogels for g-C3N4 through nanostructural engineering is a rapid, feasible, and cost-effective technique to improve the adsorption capability, stability, and separability of the hydrogel composite; to increase the number of active sites; and to create an internal conductive path for facile charge transfer and high photocatalytic activity...
December 5, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30500470/pt-tio-2-nanotube-photocatalyst-effect-of-synthesis-methods-on-valance-state-of-pt-and-its-influence-on-hydrogen-production-and-dye-degradation
#9
Nagappagari Lakshmanareddy, Vempuluru Navakoteswara Rao, Kanakkampalayam Krishnan Cheralathan, Ellappalayam Palanisamy Subramaniam, Muthukonda Venkatakrishnan Shankar
Direct conversion of solar energy into clean fuels is emerging as an efficient way for the future energy generation and solving environmental issues. Especially, photocatalytic splitting of water into H2 under solar light irradiation is one of the best techniques for clean energy production. Also, decomposition of organic pollutants using solar light is an urgent need to protect the environment. Hence, in the present study, we studied Pt-TiO2 nanotubes based composites for H2 generation and methyl orange dye degradation under solar light irradiation and compared the effect of deposition methods namely photo-deposition and chemical reduction methods...
November 20, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/30499570/progress-on-ternary-oxide-based-photoanodes-for-use-in-photoelectrochemical-cells-for-solar-water-splitting
#10
REVIEW
Dong Ki Lee, Dongho Lee, Margaret A Lumley, Kyoung-Shin Choi
Solar water splitting using photoelectrochemical cells (PECs) has emerged as one of the most promising routes to produce hydrogen as a clean and renewable fuel source. Among various semiconductors that have been considered as photoelectrodes for use in PECs, oxide-based photoanodes are particularly attractive because of their stability in aqueous media in addition to inexpensive and facile processing compared to other types of semiconductors. However, they typically suffer from poor charge carrier separation and transport...
November 30, 2018: Chemical Society Reviews
https://www.readbyqxmd.com/read/30489669/control-of-spatially-homogeneous-distribution-of-heteroatoms-to-produce-red-tio2-photocatalyst-for-visible-light-photocatalytic-water-splitting
#11
Xingxing Hong, Jun Tan, Huaze Zhu, Ningdong Feng, Yongqiang Yang, John Irvine, Lianzhou Wang, Gang Liu, Hui-Ming Cheng
The strong band-to-band absorption of photocatalysts spanning the whole visible light region (400-700 nm) is critically important for solar-driven photocatalysis. Although it is actively and widely used as photocatalyst for various reactions in the past four decades, TiO2 has a very poor ability to capture the whole-spectrum visible light. Here, by controlling the spatially homogeneous distribution of boron and nitrogen heteroatoms in anatase TiO2 microspheres with a predominance of high-energy {001} facets, a strong visible light absorption spectrum with a sharp edge beyond 680 nm is achieved...
November 29, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/30485695/metal-nanoclusters-new-paradigm-in-catalysis-for-water-splitting-solar-and-chemical-energy-conversion
#12
Khurram Joya, Akhtar Munir, Syed Zajif Hussain, Najeeb Ullah, Ahsanulhaq Qureshi, Irshad Hussain, Noor-Ul-Ain Babar
Sustainable future extremely demands the innovative breakthroughs in science and technology today especially in the energy sector. Earth-abundant resources can be explored and used to develop renewable and sustainable resources of energy to meet the ever increasing global energy demand. The efficient solar-powered conversion systems with the exploitation of cheap and robust catalytic materials for the photo and photo-electro-induced water splitting, photovoltaic cell, fuel cell and renovation of waste products (such as CO2) as chemical fuel are appealing solutions in this quest...
November 28, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30463186/preparation-of-assembled-carbon-soot-films-and-hydrophobic-properties
#13
Lei Zhao, Kang Zhao, Wei-Guo Yan, Zhifeng Liu
In this paper, a simple, inexpensive, and rapid method for the fabrication of controlled layer candle soot film has been reported by interface self-assembly and transferred method. The mechanism of candle soot self-assembly is explained and their morphology, elemental composition, optical, and wetting properties are characterized. The uniformity and thickness of prepared films especially depend on the concentration of candle soot mixed solution (alcohol and deionized water). The results show that the optimal concentration of candle soot solution is approximately ~0...
November 19, 2018: Materials
https://www.readbyqxmd.com/read/30460956/boosting-the-photocatalytic-hydrogen-evolution-activity-of-g-c-3-n-4-nanosheets-by-cu-2-oh-2-co-3-modification-and-dye-sensitization
#14
Yumin Liu, Xinxin Wu, Hua Lv, Yafei Cao, Hao Ren
Considering the cleanness and renewability of the solar H2-production system, photocatalytic H2-production from water splitting with the assistance of nonprecious and Earth-abundant cocatalysts has become a research hotspot. Herein, robust Cu2(OH)2CO3 nanoparticles were successfully anchored onto the surface of g-C3N4 nanosheets through a mild precipitation route in which Cu2(OH)2CO3 serves as an effectively nonprecious metal-based cocatalyst for boosting hydrogen generation. The results demonstrated that the as-prepared hybrid Cu2(OH)2CO3/g-C3N4 nanocomposite photocatalyst with an optimum 3 wt% loading amount of Cu2(OH)2CO3 exhibited a noticeable improvement of photocatalytic H2-evolution performance under visible light illumination...
November 21, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/30431652/construction-of-direct-z-scheme-photocatalysts-for-overall-water-splitting-using-two-dimensional-van-der-waals-heterojunctions-of-metal-dichalcogenides
#15
Cen-Feng Fu, Ruiqi Zhang, Qiquan Luo, Xingxing Li, Jinlong Yang
The direct Z-scheme system constructed by two-dimensional (2D) materials is an efficient route for hydrogen production from photocatalytic water splitting. In the present work, the 2D van der Waals (vdW) heterojunctions of MoSe2 /SnS2 , MoSe2 /SnSe2 , MoSe2 /CrS2 , MoTe2 /SnS2 , MoTe2 /SnSe2 , and MoTe2 /CrS2 are proposed to be promising candidates for direct Z-scheme photocatalysts and verified by first principles calculations. Perpendicular electric field is induced in these 2D vdW heterojunctions, which enhances the efficiency of solar energy utilization...
November 15, 2018: Journal of Computational Chemistry
https://www.readbyqxmd.com/read/30424499/metal-organic-frameworks-based-materials-for-heterogeneous-photocatalysis
#16
REVIEW
Shu-Na Zhao, Guangbo Wang, Dirk Poelman, Pascal Van Der Voort
The increase in environmental pollution due to the excessive use of fossil fuels has prompted the development of alternative and sustainable energy sources. As an abundant and sustainable energy, solar energy represents the most attractive and promising clean energy source for replacing fossil fuels. Metal organic frameworks (MOFs) are easily constructed and can be tailored towards favorable photocatalytic properties in pollution degradation, organic transformations, CO₂ reduction and water splitting. In this review, we first summarize the different roles of MOF materials in the photoredox chemical systems...
November 12, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/30411486/surface-engineering-of-nanomaterials-for-photo-electrochemical-water-splitting
#17
REVIEW
Bin Yao, Jing Zhang, Xiaoli Fan, Jianping He, Yat Li
Photo-electrochemical water splitting represents a green and environmentally friendly method for producing solar hydrogen. Semiconductor nanomaterials with a highly accessible surface area, reduced charge migration distance, and tunable optical and electronic property are regarded as promising electrode materials to carry out this solar-to-hydrogen process. Since most of the photo-electrochemical reactions take place on the electrode surface or near-surface region, rational engineering of the surface structures, physical properties, and chemical nature of photoelectrode materials could fundamentally change their performance...
November 8, 2018: Small
https://www.readbyqxmd.com/read/30411099/ta-3-n-5-co-oh-x-composites-as-photocatalysts-for-photoelectrochemical-water-splitting
#18
Kaiqi Xu, Athanasios Chatzitakis, Ingvild Julie Thue Jensen, Mathieu Grandcolas, Truls Norby
Ta3N5 nanotubes (NTs) were obtained from nitridation of Ta2O5 NTs, which were grown directly on Ta foil through a 2-step anodization procedure. With Co(OH)x decoration, a photocurrent density as high as 2.3 mA cm-2 (1.23 V vs. NHE) was reached under AM1.5G simulated solar light; however, the electrode suffered from photocorrosion. More stable photoelectrochemical (PEC) performance was achieved by first loading Co(OH)x, followed by loading cobalt phosphate (Co-Pi) as double co-catalysts. The Co(OH)x/Co-Pi double co-catalysts may act as a hole storage layer that slows down the photocorrosion caused by the accumulated holes on the surface of the electrode...
November 9, 2018: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/30408689/room-temperature-synthesis-of-cds-srtio-3-nanodots-on-nanocubes-for-efficient-photocatalytic-h-2-evolution-from-water
#19
Xing-Liang Yin, Lei-Lei Li, Da-Cheng Li, Deng-Hu Wei, Cheng-Chao Hu, Jian-Min Dou
Spontaneous solar-driven water splitting to generate H2 with no pollution discharge is an ideal H2 generation approach. However, its efficiency remains far from real application owing to the poor light-harvesting and ultrafast charge recombination of photocatalysts. To address these issues, herein, we employed a novel but simple chemical bath deposition (CBD) method to construct CdS/SrTiO3 nanodots-on-nanocubes at room temperature (ca. 25 °C). The as-synthesized nanohybrids not only expand light absorption from ultraviolet (UV) to visible light but also significantly retard charge recombination owing to the well-defined heterostructure formation...
February 15, 2019: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/30374204/hybrid-photoelectrochemical-and-photovoltaic-cells-for-simultaneous-production-of-chemical-fuels-and-electrical-power
#20
Gideon Segev, Jeffrey W Beeman, Jeffery B Greenblatt, Ian D Sharp
Harnessing solar energy to drive photoelectrochemical reactions is widely studied for sustainable fuel production and versatile energy storage over different timescales. However, the majority of solar photoelectrochemical cells cannot drive the overall photosynthesis reactions without the assistance of an external power source. A device for simultaneous and direct production of renewable fuels and electrical power from sunlight is now proposed. This hybrid photoelectrochemical and photovoltaic device allows tunable control over the branching ratio between two high-value products of solar energy conversion, requires relatively simple modification to existing photovoltaic technologies, and circumvents the photocurrent mismatches that lead to significant loss in tandem photoelectrochemical systems comprising chemically stable photoelectrodes...
October 29, 2018: Nature Materials
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