scholarly journals Photoelectrochemical water oxidation of GaP1−xSbx with a direct band gap of 1.65 eV for full spectrum solar energy harvesting

2019 ◽  
Vol 3 (7) ◽  
pp. 1720-1729 ◽  
Author(s):  
Mahdi Alqahtani ◽  
Sanjayan Sathasivam ◽  
Lipin Chen ◽  
Pamela Jurczak ◽  
Rozenn Piron ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Band Gap ◽  
Water Splitting ◽  
Water Oxidation ◽  
Fossil Fuels ◽  
Full Spectrum ◽  
Direct Band Gap ◽  
Solar Energy Harvesting ◽  
Direct Band ◽  
Photoelectrochemical Water Oxidation

Hydrogen produced using artificial photosynthesis, i.e. water splitting, is a promising energy alternative to fossil fuels.

Band gap tuning to improve the photoanodic activity of ZnInxSy for photoelectrochemical water oxidation

2019 ◽  
Vol 9 (23) ◽  
pp. 6769-6781 ◽  
Author(s):  
Mamta Devi Sharma ◽  
Chavi Mahala ◽  
Mrinmoyee Basu
Keyword(s):  
Band Gap ◽  
Water Splitting ◽  
Water Oxidation ◽  
Photoelectrochemical Water Splitting ◽  
Elemental Doping ◽  
Band Gap Tuning ◽  
Photoelectrochemical Water Oxidation

Elemental doping and band gap tuning of ZnInxSy result in enhanced photoelectrochemical water splitting activity.

GaS0.5Te0.5 monolayer as an efficient water splitting photocatalyst

2017 ◽  
Vol 19 (23) ◽  
pp. 15394-15402 ◽  
Author(s):  
Yujie Bai ◽  
Qinfang Zhang ◽  
Gaixia Luo ◽  
Yali Bu ◽  
Lei Zhu ◽  
...  
Keyword(s):  
Visible Light ◽  
Band Gap ◽  
Water Splitting ◽  
Band Edge ◽  
Redox Potentials ◽  
Promising Candidate ◽  
Light Water ◽  
Direct Band Gap ◽  
Direct Band

GaS0.5Te0.5 monolayer is a promising candidate as a visible-light water splitting photocatalyst, which is a direct band gap (2.09 eV) semiconductor, and has an appropriate band edge alignment with respect to the water redox potentials in both acidic and neutral environments.

Large Band Gap Photoabsorbers for Tandem Water Splitting Devices

2018 ◽  
Vol MA2018-01 (31) ◽  
pp. 1912-1912
Author(s):  
Andrea Crovetto ◽  
Korina Kuhar ◽  
Peter C. K. Vesborg ◽  
Ole Hansen ◽  
Monish Pandey ◽  
...  
Keyword(s):  
Physical Chemistry ◽  
Band Gap ◽  
Water Splitting ◽  
Environmental Science ◽  
List Type ◽  
Web Based ◽  
Effective Electron ◽  
Direct Band Gap ◽  
Computational Screening ◽  
Direct Band

This talk will first discuss the parameters necessary for an optimal water-splitting device using a web based modeling program we developed (SolarFuelsModeling.com).1 The results from this show an optimal a tandem device for water splitting needs photoabsorbers with band gaps of ~2.0 eV and 1.1 eV. After a short review on our work on small band gap Si photoelectrodes,2-4 we will then discuss our combined computational and experimental approach to finding highly efficient large band gap photoabsorbers.5 Using computational modeling, we investigated ABS3 type sulfides and found 15 materials with a reasonable band gap, a direct band gap, low effective electron/hole mass and that are relatively defect tolerant. One of these proposed materials, LaYS3 has already been tested and shows a direct band gap near 2 eV and a fluorescence spectra indicating no significant mid gap states as shown in the image below. Seger, B.; Hansen, O.; Vesborg, P. C. K., A Flexible Web-Based Approach to Modeling Tandem Photocatalytic Devices. Solar RRL 2017, 1 (1), n/a-n/a. Mei, B.; Permyakova, A. A.; Frydendal, R.; Bae, D.; Pedersen, T.; Malacrida, P.; Hansen, O.; Stephens, I. E. L.; Vesborg, P. C. K.; Seger, B.; Chorkendorff, I., Iron-Treated NiO as a Highly Transparent p-Type Protection Layer for Efficient Si-Based Photoanodes. Journal of Physical Chemistry Letters 2014, 5 (20), 3456-3461. Mei, B.; Seger, B.; Pedersen, T.; Malizia, M.; Hansen, O.; Chorkendorff, I.; Vesborg, P. C. K., Protection of p(+)-n-Si Photoanodes by Sputter-Deposited Ir/IrOx Thin Films. Journal of Physical Chemistry Letters 2014, 5 (11), 1948-1952. Seger, B.; Pedersen, T.; Laursen, A. B.; Vesborg, P. C. K.; Hansen, O.; Chorkendorff, I., Using TiO2 as a Conductive Protective Layer for Photocathodic H-2 Evolution. Journal of the American Chemical Society 2013, 135 (3), 1057-1064. Kuhar, K.; Andrea, C.; Monish, P.; Kristian, S. T.; Brian, S.; Peter, V.; Ole, H.; Chorkendorff, I.; Karsten, W. J., Sulfide Perovskites for Solar Energy Conversion Applications: Computational Screening and Synthesis of the Selected Compound LaYS3. Energy & Environmental Science 2017, Accepted. Figure 1

Electrochemical and photoelectrochemical water splitting with a CoOx catalyst prepared by flame assisted deposition

2020 ◽  
Vol 49 (3) ◽  
pp. 588-592 ◽  
Author(s):  
Fusheng Li ◽  
Ziqi Zhao ◽  
Hao Yang ◽  
Dinghua Zhou ◽  
Yilong Zhao ◽  
...  
Keyword(s):  
Cobalt Oxide ◽  
Water Splitting ◽  
Water Oxidation ◽  
Oxide Catalyst ◽  
Photoelectrochemical Water Splitting ◽  
Deposition Method ◽  
Photoelectrochemical Water Oxidation

A cobalt oxide catalyst prepared by a flame-assisted deposition method on the surface of FTO and hematite for electrochemical and photoelectrochemical water oxidation, respectively.

SIn2Te/TeIn2Se: a type-II heterojunction as water-splitting photocatalyst with high solar energy harvesting

2021 ◽  
Author(s):  
Peishen Shang ◽  
Chunxiao Zhang ◽  
Mengshi Zhou ◽  
Chaoyu He ◽  
Tao Ouyang ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Solar Energy ◽  
Water Splitting ◽  
First Principles ◽  
Type Ii ◽  
Two Dimensional ◽  
First Principles Calculations ◽  
Solar Energy Harvesting ◽  
Renewable Hydrogen

Searching for photocatalysts is crucial for the production of renewable hydrogen from water. Two-dimensional (2D) vdW heterojunctions show great potential. Using first- principles calculations within the HSE06 functional, we propose...

Optical Studies of Poly (N-Carbazole) (PVK) Blending with Polyvinylpyrrolidone (PVP) Using Tauc/Davis-Mott Model

2013 ◽  
Vol 652-654 ◽  
pp. 527-531 ◽  
Author(s):  
A.N. Alias ◽  
T.I. Tunku Kudin ◽  
Z.M. Zabidi ◽  
M.K. Harun ◽  
Ab Malik Marwan Ali ◽  
...  
Keyword(s):  
Band Gap ◽  
Urbach Energy ◽  
Quartz Substrate ◽  
Optical Studies ◽  
Direct Band Gap ◽  
Mott Model ◽  
Blended Polymer ◽  
Electronic Parameters ◽  
Direct Band ◽  
Indirect Band Gap

The optical absorption spectra of blended poly (N-carbazole) (PVK) with polyvinylpyrrolidone (PVP) in various compositions are investigated. A doctor blade technique was used to coat the blended polymer on a quartz substrate. The electronic parameters such as absorption edge (Ee), allowed direct band gap (Ed), allowed indirect band gap (Ei), Urbach edge (Eu) and steepness parameter (γ) were calculated using Tauc/Davis-Mott Model. The results reveal that the Ee, Ed and Ei increase with increasing of PVP ratio. There also have variation changing in Urbach energy and steepness parameter.

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