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

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.

scholarly journals Efficient Photoelectrochemical Water Splitting by Tailoring MoS2/CoTe Heterojunction in a Photoelectrochemical Cell

Nanomaterials ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2341
Author(s):  
Effat Sitara ◽  
Habib Nasir ◽  
Asad Mumtaz ◽  
Muhammad Fahad Ehsan ◽  
Manzar Sohail ◽  
...  
Keyword(s):  
Water Splitting ◽  
Electrochemical Impedance ◽  
Linear Sweep Voltammetry ◽  
Photocurrent Density ◽  
Photoelectrochemical Water Splitting ◽  
Photoelectrochemical Cell ◽  
Electron Hole ◽  
Pair Separation ◽  
Electron Hole Pair ◽  
Electrochemical Impedance Spectroscopic

Solar energy conversion through photoelectrochemical water splitting (PEC) is an upcoming promising technique. MoS2/CoTe heterostructures were successfully prepared and utilized for PEC studies. MoS2 and CoTe were prepared by a hydrothermal method which were then ultrasonicated with wt. % ratios of 1:3, 1:1 and 3:1 to prepare MoS2/CoTe (1:3), MoS2/CoTe (1:1) and MoS2/CoTe (3:1) heterostructure, respectively. The pure materials and heterostructures were characterized by XRD, UV–vis-DRS, SEM, XPS, PL and Raman spectroscopy. Photoelectrochemical measurements were carried out by linear sweep voltammetry and electrochemical impedance spectroscopic measurements. A maximum photocurrent density of 2.791 mA/cm2 was observed for the MoS2/CoTe (1:1) heterojunction which is about 11 times higher than the pristine MoS2. This current density was obtained at an applied bias of 0.62 V vs. Ag/AgCl (1.23 V vs. RHE) under the light intensity of 100 mW/cm2 of AM 1.5G illumination. The enhanced photocurrent density may be attributed to the efficient electron–hole pair separation. The solar to hydrogen conversion efficiency was found to be 0.84% for 1:1 MoS2/CoTe, signifying the efficient formation of the p-n junction. This study offers a novel heterojunction photocatalyst, for PEC water splitting.

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.

Cooperation effect of heterojunction and co-catalyst in BiVO4/Bi2S3/NiOOH photoanode for improving photoelectrochemical performances

2018 ◽  
Vol 42 (24) ◽  
pp. 19415-19422 ◽  
Author(s):  
Jindong Wei ◽  
Cailou Zhou ◽  
Ying Xin ◽  
Xifei Li ◽  
Lei Zhao ◽  
...  
Keyword(s):  
Reaction Kinetics ◽  
Water Splitting ◽  
Light Absorption ◽  
Surface Reaction ◽  
Photogenerated Electron ◽  
Photoelectrochemical Water Splitting ◽  
Electron Hole ◽  
Co Catalyst ◽  
Surface Reaction Kinetics

The separation and transport of photogenerated electron–hole pairs as well as wider light absorption and surface reaction kinetics are the main limitations in photoelectrochemical water splitting.

Towards zero bias photoelectrochemical water splitting: onset potential improvement on a Mg:GaN modified-Ta3N5 photoanode

2018 ◽  
Vol 6 (31) ◽  
pp. 15265-15273 ◽  
Author(s):  
Ela Nurlaela ◽  
Yutaka Sasaki ◽  
Mamiko Nakabayashi ◽  
Naoya Shibata ◽  
Taro Yamada ◽  
...  
Keyword(s):  
Water Splitting ◽  
Photoelectrochemical Water Splitting ◽  
Electron Hole ◽  
Zero Bias ◽  
Hole Transfer ◽  
Potential Shift ◽  
Onset Potential ◽  
Potential Improvement ◽  
Mg Doped

A remarkable onset potential shift has been demonstrated on Ta3N5 modified with a Mg:GaN layer. The Mg-doped GaN band positions facilitate more efficient electron/hole transfer to/from Ta3N5, inducing a negative onset potential shift to 0 vs. RHE.

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
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