scholarly journals Integrated Devices for Photoelectrochemical Water Splitting Using Adapted Silicon Based Multi-Junction Solar Cells Protected by ALD TiO2 Coatings

2020 ◽  
Vol 234 (6) ◽  
pp. 1155-1169 ◽  
Author(s):  
Thorsten Cottre ◽  
Katharina Welter ◽  
Emanuel Ronge ◽  
Vladimir Smirnov ◽  
Friedhelm Finger ◽  
...  
Keyword(s):  
Water Splitting ◽  
Photoelectron Spectroscopy ◽  
Band Alignment ◽  
Photoelectrochemical Water Splitting ◽  
Maximum Efficiency ◽  
Electrode Arrangement ◽  
Integrated Devices ◽  
Junction Device ◽  
Platinum Particles ◽  
Silicon Based

AbstractIn this study, we present different silicon based integrated devices for photoelectrochemical water splitting, which provide enough photovoltage to drive the reaction without an external bias. Thin films of titanium dioxide, prepared by atomic layer deposition (ALD), are applied as a surface passivation and corrosion protection. The interfaces between the multi-junction cells and the protective coating were optimized individually by etching techniques and finding optimal parameters for the ALD process. The energy band alignment of the systems was studied by X-ray photoelectron spectroscopy (XPS). Electrochemically deposited platinum particles were used to reduce the HER overpotential. The prepared systems were tested in a three-electrode arrangement under AM 1.5 illumination in 0.1 M KOH. In final tests the efficiency and stability of the prepared devices were tested in a two-electrode arrangement in dependence of the pH value with a ruthenium-iridium oxide counter electrode. For the tandem-junction device solar to hydrogen efficiencies (STH) up to 1.8% were reached, and the triple-junction device showed a maximum efficiency of 4.4%.

Cadmium Sulphide Sensitized Crystal Facet Tailored Nanostructured Nickel Ferrite @ Hematite Core-Shell Ternary Heterojunction Photoanode for Photoelectrochemical Water Splitting

MRS Advances ◽  
2020 ◽  
Vol 5 (50) ◽  
pp. 2585-2593
Author(s):  
Soumyajit Maitra ◽  
Arundhati Sarkar ◽  
Toulik Maitra ◽  
Somoprova Halder ◽  
Subhasis Roy ◽  
...  
Keyword(s):  
Water Splitting ◽  
Cadmium Sulphide ◽  
Band Alignment ◽  
Photoelectrochemical Water Splitting ◽  
Cds Nanoparticles ◽  
Core Shell ◽  
Xenon Lamp ◽  
Photoelectrochemical Performance ◽  
Crystal Facet ◽  
Hydrothermal Approach

AbstractDesign of composite semiconductor nanostructures with proper band alignment for efficient charge separation and carrier transport has been at the center of research for photoelectrochemical water splitting. This work demonstrates the deposition of a NiFe2O4 @Fe2O3 core-shell nanostructured film sensitized with CdS to form a ternary heterojunction for cascade type electron transfer. The hematite nanostructures were grown by hydrothermal approach through dipping into a solution of Nickel Nitrate yielded anchoring of Ni2+ ions on the outer surface. The films were then annealed at 650 0C for the diffusion of Ni2+ ions into the hematite lattice which forms core-shell NiFe2O4 @Fe2O3 heterojunction. The films were further sensitized with CdS nanoparticles deposited by a hydrothermal approach to form the final ternary heterojunction photoanode. Several different nanostructures were grown and the effect of crystal facet tailoring was observed on Ni loading and photoelectrochemical performance. The photoelectrochemical measurements were carried out using a potentiostat under 100 mW/cm2 light source (150W Xenon Lamp) with Pt counter electrode and 0.5 M Na2S and 0.5 M Na2SO3 electrolyte. A current density of 3.47 mA/cm2 was observed at 1.23 V (vs Ag/AgCl). An Applied Bias to Photocurrent Efficiency (ABPE) of 1.8 % photoconversion efficiency was observed using the fabricated electrodes at 0.288V (vs Ag/AgCl).

scholarly journals Silicon based photoelectrodes for photoelectrochemical water splitting

2019 ◽  
Vol 27 (4) ◽  
pp. A51 ◽  
Author(s):  
Ronglei Fan ◽  
Zetian Mi ◽  
Mingrong Shen
Keyword(s):  
Water Splitting ◽  
Photoelectrochemical Water Splitting ◽  
Silicon Based

Anodically Fabricated Sr-doped TiO2 Nanotube Arrays for Photoelectrochemical Water Splitting Applications

2011 ◽  
Vol 1352 ◽  
Author(s):  
Hoda A. Hamedani ◽  
Nageh K. Allam ◽  
Hamid Garmestani ◽  
Mostafa A. El-Sayed
Keyword(s):  
Electron Microscopy ◽  
Water Splitting ◽  
Photoelectron Spectroscopy ◽  
Dopant Concentration ◽  
Solubility Limit ◽  
Photoelectrochemical Water Splitting ◽  
Electrochemical Anodization ◽  
Photoelectrochemical Activity ◽  
X Ray ◽  
Doped Titania

ABSTRACTThe present work reports the synthesis of self-organized strontium-doped titania nanotubes arrays as a potential material for photocatalytic water splitting. Electrochemical anodization process was used to grow such material under various electrochemical conditions. The effect of dopant concentration on the morphology and photoelectrochemical properties of the material was investigated. The microstructure, morphology and composition of as-prepared and heat treated nanotubes were characterized by field emission scanning electron microscopy (FESEM), x-ray diffraction (XRD), transmission electron microscopy (TEM) and x-ray photoelectron spectroscopy (XPS). The results showed that increasing the dopant concentration up to its solubility limit results in higher photoelectrochemical activity. A preliminary proof of concept of the photocatalytic activity of the fabricated material was estimated in terms of the use of such material as a photoanode for photoelectrochemical water splitting.

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