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PubMed Journals Articles About "Photoelectrochemical Water Splitting Efficiency Hits" RSS

13:49 EST 25th February 2020 | BioPortfolio

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Showing "Photoelectrochemical water splitting efficiency hits" PubMed Articles 1–25 of 13,000+

5.1% efficiency of Si photoanodes for photoelectrochemical water splitting catalyzed by porous NiFe (oxy)hydroxide converted from NiFe oxysulfide.

A porous NiFe (oxy)hydroxide catalyst fabricated on n+pp+-Si/Ni/NiOx, which is converted from an electrodeposited NiFe oxysulfide, allows a silicon photoanode for water splitting to hit a record 5.1% efficiency with good stability of up to 135 h under 40 mA cm-2 in 1.0 M NaOH.


Interfacial growth of the optimal BiVO nanoparticles onto self-assembled WO nanoplates for efficient photoelectrochemical water splitting.

Photoelectrochemical water splitting is the most efficient green engineering approach to convert the sun light into hydrogen energy. The formation of high surface area core-shell heterojunction with enhanced light-harvesting efficiency, elevated charge separation, and transport are key parameters in achieving the ideal water splitting performance of the photoanode. Herein, we demonstrate a first green engineering interfacial growth of the BiVO nanoparticles onto self-assembled WO nanoplates forming WO/BiVO ...

Theoretical limits of multiple exciton generation and singlet fission tandem devices for solar water splitting.

Photoelectrochemical (PEC) water splitting is one of the most important approaches being investigated for solar fuel generation. In this study, we determine the maximum thermodynamic power conversion efficiencies (PCEs) of PEC water splitting two-bandgap tandem devices that produce multiple carriers per photon absorbed via Multiple Exciton Generation (MEG) or Singlet Fission (SF) and in the presence of solar concentration. Here, we employ a detailed balance thermodynamic analysis to determine the effects of...


A van der Waals Heterostructure Based on Graphene-like Gallium Nitride and Boron Selenide: A High-Efficiency Photocatalyst for Water Splitting.

Hydrogen generation by photocatalytic water splitting has attained more and more research interests in the recent years since the solar energy can be directly transferred and stored as hydrogen. However, the search for a high-efficiency photocatalyst for water splitting is a really challenge. In this paper, we designed a novel 2D material-based van der Waals heterostructure (vdWH) composed by g-GaN and BSe, which is thermally stable at room temperature. The g-GaN/BSe vdWH has suitable band-edge positions fo...

Enhanced photoelectrochemical performance of NaNbO3 nanofibers photoanode coupled with visible-light active g-C3N4 nanosheets for water splitting.

Sodium niobate nanofibers (NaNbO3-NF) have been synthesized by hydrothermal technique and further coupled with visible light responsive graphitic carbon nitride (g-C3N4) nanosheets in the different concentration ratio of 2:1 (2-CN), 4:1 (4-CN) and 8:1 (8-CN). A significant improvement in the photoelectrochemical (PEC) performance of g-C3N4/NaNbO3-NF (4-CN) nanostructured photoanode as compared to bare NaNbO3 photoanode is observed. A current density of 12.55 mA cm-2 at 1 V with respect to Ag/AgCl reference ...

Transferred monolayer MoS onto GaN for heterostructure photoanode: Toward stable and efficient photoelectrochemical water splitting.

Solar-driven photoelectrochemical water splitting (PEC-WS) using semiconductor photoelectrodes is considered a promising solution for sustainable, renewable, clean, safe and alternative energy sources such as hydrogen. Here, we report the synthesis and characterization of a novel heterostructure MoS/GaN to be used as a photoanode for PEC-WS. The heterostructure was synthesized by metal-organic chemical vapor deposition of single crystalline GaN onto a c-plane sapphire substrate, followed by the deposition o...

The Self-Passivation Mechanism in Degradation of BiVO Photoanode.

BiVO is a promising photoanode material for solar-assisted water splitting in a photoelectrochemical cell but has a propensity to degrade. Investigations carried out here in 0.1 M NaSO electrolyte showed that degradation is by dissolution of V in the electrolyte while Bi is retained on the anode probably in the form of solid Bi oxide (BiO, BiO). Accumulation of Bi oxide on the anode surface leads to passivation from further degradation. Thermodynamic modeling of possible degradation reactions has provided ...

Strategies for enhancing the photocurrent, photovoltage, and stability of photoelectrodes for photoelectrochemical water splitting.

To accelerate the deployment of hydrogen produced by renewable solar energy, several technologies have been competitively developed, including photoelectrochemical (PEC), photocatalytic, and photovoltaic-electrolysis routes. In this review, we place PEC in context with these competing technologies and highlight key advantages of PEC systems. After defining the unique performance metrics of the PEC water splitting system, recently developed strategies for enhancing each performance metric, such as the photoc...

Interfacial Charge Transport in 1D TiO Based Photoelectrodes for Photoelectrochemical Water Splitting.

1D nanostructured photoelectrodes are promising for application as photoelectrochemical (PEC) devices for solar energy conversion into hydrogen (H ) owing to the optical, structural, and electronic advantages. Titanium dioxide (TiO ) is the most investigated candidate as a photoelectrode due to its good photostability, low production cost, and eco-friendliness. The obstacle for TiO 's practical application is the inherent wide bandgap (UV-lights response), poor conductivity, and limited hole diffusion lengt...

Phosphorus and Yttrium Codoped Co(OH)F Nanoarray as Highly Efficient and Bifunctional Electrocatalysts for Overall Water Splitting.

Rational design and synthesis of bifunctional electrocatalysts with high efficiency and low-cost for overall water splitting is still a challenge. A simple approach is reported to prepare a phosphorus and yttrium codoped cobalt hydroxyfluoride (YP-Co(OH)F) nanoarray on nickel foam, which displays high-performance for both hydrogen evolution reaction (HER) and oxygen evolution reaction in alkaline solution. The codoping of yttrium and phosphorus into Co(OH)F leads to a tuned electronic environment and favora...

Stable and sustainable photoanodes using zinc oxide and cobalt oxide chemically gradient nanostructures for water-splitting applications.

Amorphous cobalt oxide (CoO) encapsulated zinc oxide (ZnO) nanostructures were developed by adopting three low-temperature methods respectively atomic layer deposition, chemical bath deposition, and electrochemical deposition. The impact of CoO growth on the physical and chemical properties of ZnO nanostructures was investigated. Then, the ZnO/CoO core/shell nanostructures grown under optimized conditions were adopted for the fabrication of photoelectrochemical (PEC) water-splitting devices. The catalytic p...

Improving Water Oxidation Efficiency by Light-Induced Electric Field in Nanograting photoanodes.

Severe charge recombination in solar water-splitting devices significantly limits their performance. To address this issue, we design a frustum of a cone nanograting configuration by taking the hematite and Au-based thin-film photoanode as a model system, which greatly improves the photoelectrochemical water oxidation activity, affording an about 10-fold increase in the photocurrent density at 1.23 V versus reversible hydrogen electrode compared to the planar counterpart. The surface plasmon polaritons-indu...

Growth of NiMn layered double hydroxides on nanopyramidal BiVO4 photoanode for enhanced photoelectrochemical performance.

Photoelectrochemical water oxidation for hydrogen generation via utilizing sunlight has been considered as a very promising pathway for sustainable energy supply and environmental protection. Here, a composite photoanode, consisting of nanopyramidal BiVO4 arrays and one layered double hydroxide (NiMn-LDH) was designed and fabricated via a facile route. The obtained BiVO4/NiMn-LDH composite photoelectrode presented a significant enhancement in the PEC current density, conversion efficiency and stability for ...

Designing WO3/CdIn2S4 type-II heterojunction with both efficient light absorption and charge separation for enhanced photoelectrochemical water splitting.

WO3 is a typical photoanode material for photoelectrochemical (PEC) water splitting. However, the PEC activity of WO3 photoanode is limited by its poor visible light absorption as well as severe carrier recombination at electrode/electrolyte interface. Herein, we integrate small-band-gap CdIn2S4 nanoplates with hydrothermally-grown WO3 nanowall arrays to form into a three-dimensional (3D) WO3/CdIn2S4 heterojunction through a chemical bath deposition (CBD) process. The synthesis parameters of CdIn2S4, includ...

W doping dominated NiO/NiS interfaced nanosheets for highly efficient overall water splitting.

Constructing high-efficiency electrocatalysts is vital towards electrocatalytic water splitting, but it remains a challenge. Although Ni-based materials have drawn extensive attention as highly active catalysts, the relatively limited electroactive sites in Ni-based catalysts still remains a great issue. In order to further boost the electrocatalytic performances, heteroatom doping and interface engineering are usually adopted for modification. Here, a new strategy is developed to construct W doped NiO/NiS ...

Microscale electrodeionization: In situ concentration profiling and flow visualization.

Electrodeionization (EDI) is membrane-based desalination utilizing ion exchange membranes and ion exchange resins. By combining Electrodialysis and Ion exchanger, EDI can produce ultrapure water in a continuous-flow manner. Although its theoretical mechanisms are well documented, there is no experimental platform that can provide microscopic details inside of the system. In this paper, we present microscale EDI that can visualize in situ ion concentration, pH, and fluid flows. The platform was fabricated by...

Three-dimensional Heterostructured NiCoP@NiMn Layered Double Hydroxide Arrays Supported on Ni Foam as a Bifunctional Electrocatalyst for Overall Water Splitting.

Herein, the rational design and preparation of three-dimensional heterostructured NiCoP@NiMn layered double hydroxide arrays supported on Ni foam (NiCoP@NiMn LDH/NF) is reported as a new bifunctional water splitting electrocatalyst with high performance. Prepared with facile hydrothermal reactions and phosphorization, the NiCoP@NiMn LDH/NF is simultaneously highly active towards oxygen evolution reaction (OER) (100, 300 and 600 mA cm-2 at overpotentials of 293, 315 and 327 mV respectively) and hydrogen evol...

Particulate Photocatalysts for Light-Driven Water Splitting: Mechanisms, Challenges, and Design Strategies.

Solar-driven water splitting provides a leading approach to store the abundant yet intermittent solar energy and produce hydrogen as a clean and sustainable energy carrier. A straightforward route to light-driven water splitting is to apply self-supported particulate photocatalysts, which is expected to allow solar hydrogen to be competitive with fossil-fuel-derived hydrogen on a levelized cost basis. More importantly, the powder-based systems can lend themselves to making functional panels on a large scale...

Nonmetallic Abiotic-Biological Hybrid Photocatalyst for Visible Water Splitting and Carbon Dioxide Reduction.

Both artificial photosystems and natural photosynthesis have not reached their full potential for the sustainable conversion of solar energy into specific chemicals. A promising approach is hybrid photosynthesis combining efficient, non-toxic, and low-cost abiotic photocatalysts capable of water splitting with metabolically versatile non-photosynthetic microbes. Here, we report the development of a water-splitting enzymatic photocatalyst made of graphitic carbon nitride (g-CN) coupled with HO-degrading c...

Photoelectrochemical Solar water splitting: the role of the carbon nano materials in bismuth vanadate composite photoanodes towards efficient charge separation and transport.

Photoelectrochemical performance of bismuth vanadate (BiVO4) photoanode is limited by poor charge separation and transport properties. The role of carbon nanotube, reduced graphene oxide or graphitic carbon nitride in BiVO4 composite photoanode were investigated towards enhancing light absorption and reducing overall impedance during photo electrochemical water oxidation process. The XRD and Tauc analysis showed that the BiVO¬4 retains its monoclinic phase, n type semiconductor nature and band gap in all c...

Designing Advanced Catalysts for Energy Conversion Based on Urea Oxidation Reaction.

Urea oxidation reaction (UOR) is the underlying reaction that determines the performance of modern urea-based energy conversion technologies. These technologies include electrocatalytic and photoelectrochemical urea splitting for hydrogen production and direct urea fuel cells as power engines. They have demonstrated great potentials as alternatives to current water splitting and hydrogen fuel cell systems with more favorable operating conditions and cost effectiveness. At the moment, UOR performance is main...

Photocatalytic water splitting properties of Cu2+ exchanged beta zeolites.

Photocatalytic water splitting with solar energy is the most promising and friendly hydrogen production method. Efficient and cost-effective photocatalyst is the key to hydrogen production. The Cu dopant has been shown to greatly enhance the photocatalytic activities. In this work, the Cu2+ ions were doped into Beta zeolite powders (Cu-Beta) by the ion exchange method. The hydrogen evolution efficiency of Cu-Beta was much higher than the raw Beta zeolites without Cu loading. After solid phase reaction, the ...

Controlled Synthesis of Ni-doped MoS2 Hybrid Electrode for Synergistically Enhanced Water-Splitting Process.

The development of high-efficiency, low cost, and earth abundant electrocatalysts for overall water splitting remains challengeable. In this work, we present the nickel (Ni) modified MoS 2 hybrid catalysts grown on carbon cloth (Ni-Mo-S@CC) through a one-step hydrothermal treatment. The optimized Ni-Mo-S@CC catalyst shows excellent HER activity with low overpotentials of 168 mV at a current density of 10 mA cm -2 in 1.0 M KOH, which is lower than those of Ni-Mo-S@CC (1:1), Ni-Mo-S@CC (3:1) and pure MoS 2 . ...

Anisotropic Crystal Growth via Defects Cluster Boosted Solar Photoelectrochemical Water Splitting by n-Cu2O Thin Films.

The present study reports on anisotropic growth of the Cu2O crystals deposited on an indium tin oxide coated glass substrate via facile electrodeposition along with low temperature calcination in favor of solar photoelectrochemical water splitting. In particular, X-ray diffractometry, transmission and scanning electron microscopy reveal that appreciable oxygen vacancies are populated in the Cu2O crystals with a highly branched dendritic thin film morphology, which are presumably clustered upon the post ther...

Nano-Porous 6H-SiC Photoanodes with a Conformal Coating of Ni-FeOOH Nanorods for Zero-Onset-Potential Water Splitting.

Surface-nanostructured semiconductor photoelectrode is highly desirable for the photoelectrochemical (PEC) solar-to-fuel production due to its large active surface area, efficient light absorption, and significantly reduced distance for charge transport. Here, we demonstrate a facile approach to fabricate the nano-porous 6H-SiC photoanode with a conformal coating of Ni-FeOOH nanorods as a water oxidation co-catalyst. Such nano-porous photoanode shows significantly enhanced photocurrent density (jph) with th...


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