scholarly journals Back Electron–Hole Recombination in Hematite Photoanodes for Water Splitting

2014 ◽  
Vol 136 (6) ◽  
pp. 2564-2574 ◽  
Author(s):  
Florian Le Formal ◽  
Stephanie R. Pendlebury ◽  
Maurin Cornuz ◽  
S. David Tilley ◽  
Michael Grätzel ◽  
...  
Keyword(s):  
Water Splitting ◽  
Electron Hole ◽  
Hole Recombination

Acid Treatment Enables Suppression of Electron-Hole Recombination in Hematite for Photoelectrochemical Water Splitting

2016 ◽  
Vol 128 (10) ◽  
pp. 3464-3468 ◽  
Author(s):  
Yi Yang ◽  
Mark Forster ◽  
Yichuan Ling ◽  
Gongming Wang ◽  
Teng Zhai ◽  
...  
Keyword(s):  
Water Splitting ◽  
Acid Treatment ◽  
Photoelectrochemical Water Splitting ◽  
Electron Hole ◽  
Hole Recombination

scholarly journals Multilayer WO3/BiVO4 Photoanodes for Solar-Driven Water Splitting Prepared by RF-Plasma Sputtering

Surfaces ◽  
2020 ◽  
Vol 3 (1) ◽  
pp. 105-115 ◽  
Author(s):  
Matteo Pedroni ◽  
Gian Luca Chiarello ◽  
Espedito Vassallo ◽  
Elena Selli
Keyword(s):  
Water Splitting ◽  
Photocurrent Density ◽  
Rf Plasma ◽  
Back Side ◽  
Time Stability ◽  
Electron Hole ◽  
Plasma Sputtering ◽  
Innermost Layer ◽  
Carrier Separation ◽  
Hole Recombination

A series of WO3, BiVO4 and WO3/BiVO4 heterojunction coatings were deposited on fluorine-doped tin oxide (FTO), by means of reactive radio frequency (RF) plasma (co)sputtering, and tested as photoanodes for water splitting under simulated AM 1.5 G solar light in a three-electrode photoelectrochemical (PEC) cell in a 0.5 M NaSO4 electrolyte solution. The PEC performance and time stability of the heterojunction increases with an increase of the WO3 innermost layer up to 1000 nm. A two-step calcination treatment (600 °C after WO3 deposition followed by 400 °C after BiVO4 deposition) led to a most performing photoanode under back-side irradiation, generating a photocurrent density of 1.7 mA cm−2 at 1.4 V vs. SCE (i.e., two-fold and five-fold higher than that generated by individual WO3 and BiVO4 photoanodes, respectively). The incident photon to current efficiency (IPCE) measurements reveal the presence of two activity regions over the heterojunction with respect to WO3 alone: The PEC efficiency increases due to improved charge carrier separation above 450 nm (i.e., below the WO3 excitation energy), while it decreases below 450 nm (i.e., when both semiconductors are excited) due to electron–hole recombination at the interface of the two semiconductors.

Acid Treatment Enables Suppression of Electron-Hole Recombination in Hematite for Photoelectrochemical Water Splitting

2016 ◽  
Vol 55 (10) ◽  
pp. 3403-3407 ◽  
Author(s):  
Yi Yang ◽  
Mark Forster ◽  
Yichuan Ling ◽  
Gongming Wang ◽  
Teng Zhai ◽  
...  
Keyword(s):  
Water Splitting ◽  
Acid Treatment ◽  
Photoelectrochemical Water Splitting ◽  
Electron Hole ◽  
Hole Recombination

scholarly journals A rationally designed two-dimensional MoSe2/Ti2CO2 heterojunction for photocatalytic overall water splitting: simultaneously suppressing electron–hole recombination and photocorrosion

2021 ◽  
Author(s):  
Cen-Feng Fu ◽  
Xingxing Li ◽  
Jinlong Yang
Keyword(s):  
Transition Metal ◽  
Water Splitting ◽  
Rational Design ◽  
Transition Metal Dichalcogenides ◽  
Two Dimensional ◽  
Electron Hole ◽  
Photocatalytic Water Splitting ◽  
Overall Water Splitting ◽  
Metal Dichalcogenides ◽  
Hole Recombination

The two challenges of electron–hole recombination and photocorrosion for two-dimensional transition metal dichalcogenides in the application of photocatalytic water splitting are simultaneously suppressed by rational design of heterojunctions.

Optically Detected Magnetic Resonance and Double Beam Photoluminescence of CdS/HgS/CdS Nanoparticles

1998 ◽  
Vol 536 ◽  
Author(s):  
H. Porteanu ◽  
A. Glozman ◽  
E. Lifshitz ◽  
A. Eychmüller ◽  
H. Weller
Keyword(s):  
Optical Properties ◽  
Magnetic Resonance ◽  
Cds Nanoparticles ◽  
Electron Hole ◽  
Cladding Layer ◽  
Double Beam ◽  
Optically Detected Magnetic Resonance ◽  
Optically Detected ◽  
Cladding Layers ◽  
Hole Recombination

AbstractCdS/HgS/CdS nanoparticles consist of a CdS core, epitaxially covered by one or two monolayers of HgS and additional cladding layers of CdS. The present paper describes our efforts to identify the influence of CdS/HgS/CdS interfaces on the localization of the photogenerated carriers deduced from the magneto-optical properties of the materials. These were investigated by the utilization of optically detected magnetic resonance (ODMR) and double-beam photoluminescence spectroscopy. A photoluminescence (PL) spectrum of the studied material, consists of a dominant exciton located at the HgS layer, and additional non-excitonic band, presumably corresponding to the recombination of trapped carriers at the interface. The latter band can be attenuated using an additional red excitation. The ODMR measurements show the existence of two kinds of electron-hole recombination. These electron-hole pairs maybe trapped either at a twin packing of a CdS/HgS interface, or at an edge dislocation of an epitaxial HgS or a CdS cladding layer.

Pre-Industrial Experience in Solar Photocatalytic Mineralization of Real Wastewaters. Application to Pesticide Container Recycling

1999 ◽  
Vol 40 (4-5) ◽  
pp. 123-130 ◽  
Author(s):  
S. Malato ◽  
J. Blanco ◽  
C. Richter ◽  
B. Milow ◽  
M. I. Maldonado
Keyword(s):  
Organic Contaminants ◽  
Toxic Waste ◽  
Experimental Plant ◽  
Electron Hole ◽  
Particulate Suspensions ◽  
Photocatalytic System ◽  
Commercial Pesticide ◽  
Pesticide Container ◽  
By Products ◽  
Hole Recombination

Particulate suspensions of TiO2 irradiated with natural solar tight in a large experimental plant catalyse the oxidation of organic contaminants. The problem in using TiO2 as a photocatalyst is electron/hole recombination. One strategy for inhibiting e−/h+ recombination is to add other (irreversible) electron acceptors to the reaction. In many highly toxic waste waters where degradation of organic pollutants is the major concern, the addition of an inorganic anion to enhance the organic degradation rate may be justified. For better results, these additives should fulfil the following criteria: dissociate into harmless by-products and lead to the formation of ·OH or other oxidising agents. In this paper, we attempt to demonstrate the optimum conditions for the treatment of commercial pesticide rinsates found in the wastewater produced by a pesticide container recycling plant. The experiments were performed in one of the pilot plants of the largest solar photocatalytic system in Europe, the Detoxification Plants of the Plataforma Solar de Almería (PSA), in Spain. After testing ten different commercial pesticides, results show that peroxydisulphate enhances the photocatalytic miniralization of all of them. This study is part of an extensive project focused on the design of a solar photocatalytic plant for decontamination of agricultural rinsates in Almería (Spain).

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