scholarly journals Photoelectrocatalytic Hydrogen Production Using a TiO2/WO3 Bilayer Photocatalyst in the Presence of Ethanol as a Fuel

Catalysts ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 976 ◽  
Author(s):  
Panagiotis Marios Adamopoulos ◽  
Ioannis Papagiannis ◽  
Dimitrios Raptis ◽  
Panagiotis Lianos
Keyword(s):  
Hydrogen Production ◽  
Surface Recombination ◽  
Photoelectrochemical Cell ◽  
Photon Absorption ◽  
Bilayer Film ◽  
Carbon Paper ◽  
Faradaic Efficiency ◽  
Charge Densities ◽  
Titania Layer ◽  
Sacrificial Agent

Photoelectrocatalytic hydrogen production was studied by using a photoelectrochemical cell where the photoanode was made by depositing on FTO electrodes either a nanoparticulate WO3 film alone or a bilayer film made of nanoparticulate WO3 at the bottom covered with a nanoparticulate TiO2 film on the top. Both the electric current and the hydrogen produced by the photoelectrocatalysis cell substantially increased by adding the top titania layer. The presence of this layer did not affect the current-voltage characteristics of the cell (besides the increase of the current density). This was an indication that the flow of electrons in the combined semiconductor photoanode was through the WO3 layer. The increase of the current was mainly attributed to the passivation of the surface recombination sites on WO3 contributing to the limitation of charge recombination mechanisms. In addition, the top titania layer may have contributed to photon absorption by back scattering of light and thus by enhancement of light absorption by WO3. Relatively high charge densities were recorded, owing both to the improvement of the photoanode by the combined photocatalyst and to the presence of ethanol as the sacrificial agent (fuel), which affected the recorded current by “current doubling” phenomena. Hydrogen was produced under electric bias using a simple cathode electrode made of carbon paper carrying carbon black as the electrocatalyst. This electrode gave a Faradaic efficiency of 58% for hydrogen production.

scholarly journals A Realistic Approach for Photoelectrochemical Hydrogen Production

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1269 ◽  
Author(s):  
Elias Doukas ◽  
Paraskevi Balta ◽  
Dimitrios Raptis ◽  
George Avgouropoulos ◽  
Panagiotis Lianos
Keyword(s):  
Hydrogen Production ◽  
Water Oxidation ◽  
Photocatalytic Oxidation ◽  
Photoelectrochemical Cell ◽  
Alkaline Electrolyte ◽  
Carbon Paper ◽  
Organic Fuel ◽  
Additional Advantage ◽  
Production Of Hydrogen ◽  
Oxidation Of Organics

The production of hydrogen by water splitting has been a very attractive idea for several decades. However, the energy consumption that is necessary for water oxidation is too high for practical applications. On the contrary, the oxidation of organics is a much easier and less energy-demanding process. In addition, it may be used to consume organic wastes with a double environmental benefit: renewable energy production with environmental remediation. The oxidation of organics in a photoelectrochemical cell, which in that case is also referenced as a photocatalytic fuel cell, has the additional advantage of providing an alternative route for solar energy conversion. With this in mind, the present work describes a realistic choice of materials for the Pt-free photoelectrochemical production of hydrogen, by employing ethanol as a model organic fuel. The photoanode was made of a combination of titania with cadmium sulfide as the photosensitizer in order to enhance visible light absorbance. The cathode electrode was a simple carbon paper. Thus, it is shown that substantial hydrogen can be produced without electrocatalysts by simply exploiting carbon electrodes. Even though an ion transfer membrane was used in order to allow for an oxygen-free cathode environment, the electrolyte was the same in both the anode and cathode compartments. An alkaline electrolyte has been used to allow high hydroxyl concentration, thus facilitating organic fuel (photocatalytic) oxidation. Hydrogen production was then obtained by water reduction at the cathode (counter) electrode.

scholarly journals Sunlight-driven photocatalytic hydrogen production from water using metal-doped strontium titanate perovskite

2020 ◽  
Author(s):  
Pushkal Sharma ◽  
Cheng-Ting Lee ◽  
Jeffrey Chi-Sheng Wu
Keyword(s):  
Hydrogen Production ◽  
Water Splitting ◽  
Strontium Titanate ◽  
Experimental Studies ◽  
Light Response ◽  
Theoretical Studies ◽  
Photocatalytic Water Splitting ◽  
Visible Light Response ◽  
Sacrificial Agent ◽  
Metal Doped

<div>The effects of various metal dopants on the photocatalytic water splitting activity of SrTiO<sub>3</sub> -based photocatalysts were investigated using experimental studies. The SrTiO<sub>3</sub>:Rh (1%) has been found to give the best efficiency in water splitting out of the various metal-doped samples studied. However, the same host doped with other metal dopants such as Fe, V, Ga, and Sb leads to negligible hydrogen evolution even when at least Fe has a better visible light response. Our results accompanied by previously conducted theoretical studies by our group explain the high photocatalytic water splitting activity of Rh doped SrTiO<sub>3 </sub>. Furthermore, the effects of the amount of catalyst, the proportion of sacrificial agent and pH were studied for the SrTiO<sub>3</sub>:Rh (1 mol%) along with studying its activity with seawater.</div>

PbS Quantum Dot‐Sensitized Photoelectrochemical Cell for Hydrogen Production from Water under Illumination of Simulated Sunlight

ChemPhysChem ◽  
2010 ◽  
Vol 11 (17) ◽  
pp. 3592-3595 ◽  
Author(s):  
Yasuaki Jin‐nouchi ◽  
Takanori Hattori ◽  
Yasutaka Sumida ◽  
Musashi Fujishima ◽  
Hiroaki Tada
Keyword(s):  
Hydrogen Production ◽  
Quantum Dot ◽  
Photoelectrochemical Cell ◽  
Simulated Sunlight ◽  
Pbs Quantum Dot

Photon-absorption-based explanation of ultrasonic-assisted solar photochemical splitting of water to improve hydrogen production

2018 ◽  
Vol 43 (31) ◽  
pp. 14439-14450 ◽  
Author(s):  
Cheng Ziming ◽  
Wang Fuqiang ◽  
Liang Huaxu ◽  
Hu Shengpeng ◽  
Lin Bo ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Photon Absorption ◽  
Ultrasonic Assisted

Development of Chalcogenide Thin Film Materials for Photoelectrochemical Hydrogen Production

2013 ◽  
Vol 1558 ◽  
Author(s):  
Nicolas Gaillard ◽  
Dixit Prasher ◽  
Jess Kaneshiro ◽  
Stewart Mallory ◽  
Marina Chong
Keyword(s):  
Thin Film ◽  
Hydrogen Production ◽  
Counter Electrode ◽  
Present Communication ◽  
Microstructural Characteristics ◽  
Faradaic Efficiency ◽  
Si Solar Cells ◽  
Copper Gallium Diselenide ◽  
Photoelectrochemical Hydrogen Production ◽  
Chalcogenide Thin Film

ABSTRACTIn the present communication, we report our efforts to integrate chalcogenide-based photoelectrochemical (PEC) materials into a standalone device capable of water-splitting using sunlight as the only source of energy. More specifically, the PEC performances of copper gallium diselenide are presented. First, a brief introduction to the material microstructural characteristics is presented. Then, the PEC properties are discussed, including incident-photonto-current efficiency (>60% in the visible), Faradaic efficiency (uncatalyzed, 86%) and durability (400 hours). Finally, we report the solar-to-hydrogen benchmark efficiency (3.7%) of a device made of a CuGaSe2 photocathode and a-Si solar cells measured in a 2-electrode configuration using a RuO2 counter electrode.

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