scholarly journals A solid oxide photoelectrochemical cell with UV light-driven oxygen storage in mixed conducting electrodes

2017 ◽  
Vol 5 (4) ◽  
pp. 1637-1649 ◽  
Author(s):  
Gregor Walch ◽  
Bernhard Rotter ◽  
Georg Christoph Brunauer ◽  
Esmaeil Esmaeili ◽  
Alexander Karl Opitz ◽  
...  
Keyword(s):  
Electrochemical Cell ◽  
Uv Light ◽  
Solid Oxide ◽  
Photoelectrochemical Cell ◽  
Oxygen Storage ◽  
Uv Illumination ◽  
Working Electrode

A SrTiO3 working electrode at 360–460 °C incorporates oxygen under UV illumination. This leads to a voltage in a solid oxide (photo-)electrochemical cell..

UV-Light-Driven Oxygen Pumping in a High-Temperature Solid Oxide Photoelectrochemical Cell

2015 ◽  
Vol 26 (1) ◽  
pp. 120-128 ◽  
Author(s):  
Georg Christoph Brunauer ◽  
Bernhard Rotter ◽  
Gregor Walch ◽  
Esmaeil Esmaeili ◽  
Alexander Karl Opitz ◽  
...  
Keyword(s):  
High Temperature ◽  
Uv Light ◽  
Solid Oxide ◽  
Photoelectrochemical Cell ◽  
Oxygen Pumping

Effect of the Length of TiO2 Nanotube Arrays on Responsivity of Photoelectrochemical-Based Ultraviolet Photodetectors

2021 ◽  
pp. 2150024
Author(s):  
Bahram Abedi Ravan ◽  
Ali Akbar Saadati ◽  
Akbar Cheraghi
Keyword(s):  
Uv Light ◽  
Growth Conditions ◽  
Photoelectrochemical Cell ◽  
Ultraviolet Region ◽  
Nanotube Arrays ◽  
Ultraviolet Photodetector ◽  
Applied Bias ◽  
One Dimensional ◽  
Uv Illumination ◽  
Ultraviolet Photodetectors

In this study, one-dimensional titanium dioxide (TiO[Formula: see text] nanotube arrays (NTAs) with different tube lengths are synthesized via anodic oxidation of Ti foils and their ultraviolet (UV) light detection properties are investigated to determine their optimum growth conditions. A TiO2 nanotube ultraviolet photodetector based on photoelectrochemical cell is fabricated using the optimum TiO2 nanotubes and its characteristics in the ultraviolet region are determined. The photodetector is examined under a UV illumination intensity of 10[Formula: see text]mW/cm2and at a wavelength of 368[Formula: see text]nm. Its responsivity is measured to be about 96[Formula: see text][Formula: see text]A/cm2 and its response time is less than 0.2[Formula: see text]s under an applied bias of 0.5[Formula: see text]V.

Optical and Electrical Characterizations of Nanoscale Robust 3C-SiC Membrane for UV Sensing Applications

2018 ◽  
Vol 775 ◽  
pp. 278-282
Author(s):  
A.R.M. Foisal ◽  
T. Dinh ◽  
A. Iacopi ◽  
L. Hold ◽  
E.W. Streed ◽  
...  
Keyword(s):  
Uv Light ◽  
Optical Characterization ◽  
Considerable Change ◽  
Electrical Contacts ◽  
Si Substrate ◽  
Uv Illumination ◽  
Sensing Applications ◽  
Transmission Measurements ◽  
Electrical Characterizations

This paper presents the fabrication and optical characterization of an ultrathin 3C-SiC membrane for UV light detection. SiC nanoscale film was grown on Si substrate and subsequently released to form a robust membrane with a high aspect ratio of about 5000. Transmission measurements were performed to determine the thickness of the film with a high accuracy of 98%. We also employed a simple and highly effective direct wirebonding technique to form electrical contacts to the SiC membrane. The considerable change in the photocurrent of the SiC membrane was observed under UV illumination, indicating the potential of using 3C-SiC membranes for UV detection.

scholarly journals Nanorod Arrays Enhanced UV Light Response of Mg-Doped ZnO Films

Symmetry ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1005
Author(s):  
Der-Yuh Lin ◽  
Hone-Zern Chen ◽  
Ming-Cheng Kao ◽  
San-Lin Young ◽  
Wen-Yi Sung
Keyword(s):  
Uv Light ◽  
Sol Gel ◽  
Light Response ◽  
Band Gap Energy ◽  
Zno Films ◽  
Silicon Substrates ◽  
Nanorod Arrays ◽  
Nanocrystalline Films ◽  
Uv Illumination ◽  
Surface Morphologies

Zn1−xMgxO (x = 0, 0.03, 0.05, and 0.07) nanocrystalline films were grown on silicon substrates using the sol–gel method. Furthermore, Zn1−xMgxO vertically aligned hexagonal symmetrical nanorods with six reflection symmetries were fabricated on pure ZnO-seeded layer n-type silicon substrates via a low-temperature hydrothermal method to enhance the ultraviolet (UV) light response. The crystal microstructures and surface morphologies of nanocrystalline films and nanorod arrays were determined by X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). Transmission spectra showed that the increasing Mg content will increase the band gap energy from 3.28 to 3.46 eV. However, the current–voltage curves in the dark and under UV illumination showed that the UV response did not improve by the incorporation of magnesium. We changed the flat surface of films into symmetrical nanorod arrays and demonstrated they can significantly enhance the normalized photo-to-dark-current ratio up to ten times.

Electrochemical cell with solid oxide electrolyte and oxygen pump thereof

2011 ◽  
Vol 47 (5) ◽  
pp. 569-578 ◽  
Author(s):  
A. V. Spirin ◽  
A. V. Nikonov ◽  
A. S. Lipilin ◽  
S. N. Paranin ◽  
V. V. Ivanov ◽  
...  
Keyword(s):  
Electrochemical Cell ◽  
Solid Oxide ◽  
Solid Oxide Electrolyte ◽  
Oxygen Pump ◽  
Oxide Electrolyte

Gated Epitaxial Graphene Devices

2012 ◽  
Vol 717-720 ◽  
pp. 675-678
Author(s):  
Daniel Waldmann ◽  
Johannes Jobst ◽  
Florian Speck ◽  
Thomas Seyller ◽  
Michael Krieger ◽  
...  
Keyword(s):  
Low Temperatures ◽  
Doping Concentration ◽  
Control Experiment ◽  
Uv Light ◽  
Epitaxial Graphene ◽  
Gate Operation ◽  
Uv Illumination ◽  
Gate Structure ◽  
Graphene Devices ◽  
Bottom Gate

A bottom gate scheme is presented to tune the charge density of epitaxial graphene via a gate voltage while leaving the surface open for further manipulation or investigation. Depending on the doping concentration of the buried gate layer, the temperature and illumination, the bottom gate structure can be operated in two regimes with distinct capacitances. A model is proposed, which quantitatively describes the gate operation. The model is verified by a control experiment with an illuminated gate structure using UV light. Using UV illumination the Schottky capacitor (SC) regime, which provides improved gate efficiency, can be used even at low temperatures.

Investigating the Photoelectrochemistry of Transparent ZnO Grown on ITO/Plastic for Flexible Photoelectrochemical Cell and Photovoltaic Application

2012 ◽  
Vol 1387 ◽  
Author(s):  
Yuji Suzuki ◽  
Poopathy Kathirgamanathan ◽  
Arokia Nathan
Keyword(s):  
Uv Light ◽  
Photoelectrochemical Cell ◽  
Optical Transparency ◽  
Plastic Substrate ◽  
Trade Off ◽  
Photovoltaic Application ◽  
Toluene Sulfonate ◽  
Pet Substrate

AbstractZnO was electrochemically grown on ITO coated polyethylene (PET) substrate. By sandwiching the electrolyte (sodium para-toluene sulfonate) with so grown ZnO/ITO/PET substrate with another ITO/Plastic substrate, a transparent ZnO based flexible PV cells was fabricated. The efficiency of 0.3% was obtained when shined under UV light. It was concluded that there will be a significant trade-off between with its performance although the optical transparency is very attractive.

Optimization of a Composite Working Electrode for a New Family of Electrochemical Cell for NO Decomposition

2003 ◽  
Vol 86 (7) ◽  
pp. 1155-1158 ◽  
Author(s):  
Kazuyuki Matsuda ◽  
Sergei Bredikhin ◽  
Kunihiro Maeda ◽  
Masanobu Awano
Keyword(s):  
Electrochemical Cell ◽  
No Decomposition ◽  
New Family ◽  
Working Electrode

scholarly journals Novel Combination of Quaternary AgFeNi2S4 Semiconductor In Graphene-TiO2 Nanocomposite For The Enhanced Electrophotocatalytic Reduction of CO2

2021 ◽  
Author(s):  
Zambaga Otgonbayar ◽  
Won Chun Oh
Keyword(s):  
Catalytic Activity ◽  
Preparation Method ◽  
Uv Light ◽  
Pechini Method ◽  
Hydrocarbon Fuels ◽  
Working Electrode ◽  
The Stability ◽  
Reduction Of Co2 ◽  
Positive Effect ◽  
Morphological State

Abstract For reduction of CO2 into hydrocarbon fuels, a quaternary AgFeNi2S4 semiconductor combined in Graphene-TiO2 nanocomposite material was synthesized via the Pechini method. The catalytic activity of the photocatalyst for photocatalytic and electrochemical CO2 evolution into hydrocarbon fuels was tested. The methanol yield under UV light was 8.679, 6.349, and 4.136 %, and the methanol yields under visible light were 6.291, 4.738, and 2.339 %, respectively. The stability and reusability of the photocatalyst remained high after a 4-cycle recycling test without a decrease in yield of the final photocatalytic CO2 reduction product. The enhanced photoreduction of CO2 through the as-prepared ternary photocatalyst can be ascribed to the catalyst's conformation and low recombination rate. In electrochemical CO2 reduction, the Faraday efficiency is the main parameter that defines the performance of the working electrode and the evolution of methanol. The Faraday efficiency of AFNSGT ternary nanocomposite was 44.25 %; this is an increase in the value of the Faraday efficiency, which proves that the design of the new nanocomposite successfully increases the activity of the working electrode and has a positive effect on the electrochemical reduction of CO2. The photocatalytic and electrochemical CO2 reduction data show that the preparation method, morphological state, and charge carrier properties of the photocatalyst are important for the catalytic activity and efficiency of the methanol evolution pathway.

scholarly journals Ferroelectric Induced UV Light-Responsive Memory Devices with Low Dark Current

Electronics ◽  
2021 ◽  
Vol 10 (16) ◽  
pp. 1897
Author(s):  
Hanleem Lee ◽  
Young Tea Chun
Keyword(s):  
Vinylidene Fluoride ◽  
Uv Light ◽  
Light Exposure ◽  
Incident Light ◽  
Colour Change ◽  
Memory Device ◽  
Interface Layer ◽  
Uv Illumination ◽  
Poly Vinylidene Fluoride ◽  
Stable Performance

We developed solution-processed hybrid photodetectors with a poly (9-vinylcarbazole)/zinc oxide nanoparticle photoactive layer and a poly (vinylidene fluoride-co-trifluoroethylene) ferroelectric copolymer buffer layer on flexible plastic substrates. The presence of a ferroelectric-poling interface layer significantly enhanced the charge transfer and responsivity of the photodetectors under ultraviolet (UV, 365 nm) light exposure. The responsivity of the device reached 250 mA/W at a reverse bias of 5 V and incident light intensity of 27.5 μW/cm2. This responsivity was four times higher than that of a device without the ferroelectric copolymer layer (64 mA/W) under the same conditions. The response time of the device to incident UV light also improved from 322 to 34 ms with the addition of the ferroelectric copolymer layer. In addition, the flexible device exhibited a stable performance in an air environment up to a maximum strain of 0.3 under bending stress. Finally, a UV-light-responsive memory device was successfully fabricated by using the developed hybrid photodetector and liquid crystals. This device showed a colour change from white to black upon UV illumination, and the on-state of the device was maintained for 30 s without light exposure owing to the polarization of poly (vinylidene fluoride-co-trifluoroethylene).

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