Photoelectrochemical Performance for Water Oxidation Improved by Molecular Nickel Porphyrin-Integrated WO3 /TiO2 Photoanode

ChemSusChem ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 1746-1750 ◽  
Author(s):  
Peicheng Wei ◽  
Kaifeng Lin ◽  
Dedong Meng ◽  
Tengfeng Xie ◽  
Yong Na
Keyword(s):  
Water Oxidation ◽  
Photoelectrochemical Performance ◽  
Nickel Porphyrin ◽  
Tio2 Photoanode

Enhanced photoelectrochemical performance of internally porous Au-embedded α-Fe2O3 photoanodes for water oxidation

2017 ◽  
Vol 53 (30) ◽  
pp. 4278-4281 ◽  
Author(s):  
Pravin S. Shinde ◽  
Su Yong Lee ◽  
Jungho Ryu ◽  
Sun Hee Choi ◽  
Jum Suk Jang
Keyword(s):  
Water Oxidation ◽  
Photoelectrochemical Performance ◽  
Oxidation Performance ◽  
Photoelectrochemical Water Oxidation

We report CTAB-mediated synthesis of internally porous Au-embedded hematite photoanode with enhanced photoelectrochemical water oxidation performance.

Ultrathin CoOx nanolayers derived from polyoxometalate for enhanced photoelectrochemical performance of hematite photoanodes

2019 ◽  
Vol 7 (11) ◽  
pp. 6294-6303 ◽  
Author(s):  
Xiaohu Cao ◽  
Yifan Wang ◽  
Junqi Lin ◽  
Yong Ding
Keyword(s):  
Water Oxidation ◽  
Oxidation Kinetics ◽  
Surface States ◽  
Photoelectrochemical Performance

A CoOx nanolayer derived from Co8POM by photodeposition effectively passivates the surface states of hematite, thereby improving the water oxidation kinetics.

Modification of a thin layer of α-Fe2O3 onto a largely voided TiO2 nanorod array as a photoanode to significantly improve the photoelectrochemical performance toward water oxidation

RSC Advances ◽  
2015 ◽  
Vol 5 (77) ◽  
pp. 62611-62618 ◽  
Author(s):  
Lianwen Jia ◽  
Jiale Xie ◽  
Chunxian Guo ◽  
Chang Ming Li
Keyword(s):  
Thin Layer ◽  
Current Efficiency ◽  
Water Oxidation ◽  
Nanorod Array ◽  
Thin Layers ◽  
Applied Bias ◽  
Photoelectrochemical Performance ◽  
Tio2 Nanorod ◽  
Tio2 Nanorod Array

A largely voided TiO2 nanorod array was modified with Fe2O3 thin layers to deliver ∼3.3 times higher the applied bias photon-to-current efficiency than that of a plain TiO2 nanorod array.

scholarly journals Solar-Driven Photoelectrochemical Performance of Novel ZnO/Ag2WO4/AgBr Nanorods-Based Photoelectrodes

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Elfatih Mustafa ◽  
Rania E. Adam ◽  
Polla Rouf ◽  
Magnus Willander ◽  
Omer Nur
Keyword(s):  
Visible Light ◽  
Water Oxidation ◽  
Photoelectrochemical Performance ◽  
Silar Method ◽  
Light Water ◽  
Layer Adsorption ◽  
Basic Understanding ◽  
Growth Method ◽  
Further Development ◽  
Ionic Layer

Abstract Highly efficient photoelectrochemical (PEC) water oxidation under solar visible light is crucial for water splitting to produce hydrogen as a source of sustainable energy. Particularly, silver-based nanomaterials are important for PEC performance due to their surface plasmon resonance which can enhance the photoelectrochemical efficiency. However, the PEC of ZnO/Ag2WO4/AgBr with enhanced visible-light water oxidation has not been studied so far. Herein, we present a novel photoelectrodes based on ZnO/Ag2WO4/AgBr nanorods (NRs) for PEC application, which is prepared by the low-temperature chemical growth method and then by successive ionic layer adsorption and reaction (SILAR) method. The synthesized photoelectrodes were investigated by several characterization techniques, emphasizing a successful synthesis of the ZnO/Ag2WO4/AgBr heterostructure NRs with excellent photocatalysis performance compared to pure ZnO NRs photoelectrode. The significantly enhanced PEC was due to improved photogeneration and transportation of electrons in the heterojunction due to the synergistic effect of the heterostructure. This study is significant for basic understanding of the photocatalytic mechanism of the heterojunction which can prompt further development of novel efficient photoelectrochemical-catalytic materials. Graphic Abstract

scholarly journals A diketopyrrolopyrrole dye-based dyad on a porous TiO2 photoanode for solar-driven water oxidation

2020 ◽  
Vol 11 (47) ◽  
pp. 12769-12776
Author(s):  
Daniel Antón-García ◽  
Julien Warnan ◽  
Erwin Reisner
Keyword(s):  
Water Oxidation ◽  
Porous Tio2 ◽  
Organic Chromophore ◽  
Tio2 Photoanode

Construction of a water oxidising photoanode with an organic chromophore-catalyst dyad.

Determining the Role of Oxygen Vacancies in the Photocatalytic Performance of WO3 for Water Oxidation

2019 ◽  
Author(s):  
Sacha Corby ◽  
Laia Francàs ◽  
Andreas Kafizas ◽  
James R Durrant
Keyword(s):  
Oxygen Vacancy ◽  
Charge Carrier ◽  
Water Oxidation ◽  
Oxygen Vacancies ◽  
Photocatalytic Performance ◽  
Photoelectrochemical Performance ◽  
Solar Water Splitting ◽  
The Impact ◽  
Recombination Kinetics ◽  
Vacancy Concentrations

Oxygen vacancies are common to most metal oxides, whether intentionally incorporated or otherwise, and the study of these defects is of increasing interest for solar water splitting. In this work, we examine nanostructured WO<sub>3</sub> photoanodes of varying oxygen content to determine how the concentration of bulk oxygen-vacancy states affects the photocatalytic performance for water oxidation. Using transient optical spectroscopy, we follow the charge carrier recombination kinetics in these samples, from picoseconds to seconds, and examine how differing oxygen vacancy concentrations impact upon these kinetics. We find that samples with an intermediate concentration of vacancies (~2% of oxygen atoms) afford the greatest photoinduced charge carrier densities, and the slowest recombination kinetics across all timescales studied. This increased yield of photogenerated charges correlates with improved photocurrent densities under simulated sunlight, with both greater and lesser oxygen vacancy concentrations resulting in enhanced recombination losses and poorer J-V performances. Our conclusion, that an optimal – neither too high nor too low – concentration of oxygen vacancies is required for optimum photoelectrochemical performance, is discussed in terms of the impact of these defects on charge separation and transport, as well as the implications held for other highly doped materials for photoelectrochemical water oxidation.

scholarly journals Surface Modification of Hematite Photoanodes for Improvement of Photoelectrochemical Performance

Catalysts ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 497 ◽  
Author(s):  
Lifei Xi ◽  
Kathrin Lange
Keyword(s):  
Surface Modification ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Water Oxidation ◽  
Oxidation Kinetics ◽  
Surface Passivation ◽  
Earth Metal ◽  
Photoelectrochemical Performance ◽  
Onset Potential ◽  
Solar Water Splitting

Solar water splitting is a promising method for producing renewable fuels. Thermodynamically, the overall water splitting reaction is an uphill reaction involving a multiple electron transfer process. The oxygen evolution reaction (OER) has been identified as the bottleneck process. Hematite (α-Fe2O3) is one of the best photoanode material candidates due to its band gap properties and stability in aqueous solution. However, the reported efficiencies of hematite are notoriously lower than the theoretically predicted value mainly due to poor charge transfer and separation ability, short hole diffusion length as well as slow water oxidation kinetics. In this Review Article, several emerging surface modification strategies to reduce the oxygen evolution overpotential and thus to enhance the water oxidation reaction kinetics will be presented. These strategies include co-catalysts loading, photoabsorption enhancing (surface plasmonic metal and rare earth metal decoration), surface passivation layer deposition, surface chemical etching and surface doping. These methods are found to reduce charge recombination happening at surface trapping states, promote charge separation and diffusion, and accelerate water oxidation kinetics. The detailed surface modification methods, surface layer materials, the photoelectrochemical (PEC) performances including photocurrent and onset potential shift as well as the related proposed mechanisms will be reviewed.

scholarly journals Photoelectrochemical Response of WO3/Nanoporous Carbon Anodes for Photocatalytic Water Oxidation

2018 ◽  
Vol 4 (3) ◽  
pp. 45 ◽  
Author(s):  
Alicia Gomis-Berenguer ◽  
Jesús Iniesta ◽  
David Fermín ◽  
Conchi Ania
Keyword(s):  
Water Oxidation ◽  
Carrier Transport ◽  
Hexagonal Phase ◽  
Nanoporous Carbon ◽  
Photoelectrochemical Performance ◽  
Nanoporous Carbons ◽  
Photoelectrochemical Activity ◽  
Photoelectrochemical Response ◽  
Carbon Anodes ◽  
The Impact

This work demonstrates the ability of nanoporous carbons to boost the photoelectrochemical activity of hexagonal and monoclinic WO3 towards water oxidation under irradiation. The impact of the carbonaceous phase was strongly dependent on the crystalline structure and morphology of the semiconductor, substantially increasing the activity of WO3 rods with hexagonal phase. The incorporation of increasing amounts of a nanoporous carbon of low functionalization to the WO3 electrodes improved the quantum yield of the reaction and also affected the dynamics of the charge transport, creating a percolation path for the majority carriers. The nanoporous carbon promotes the delocalization of the charge carriers through the graphitic layers. We discuss the incorporation of nanoporous carbons as an interesting strategy for improving the photoelectrochemical performance of nanostructured semiconductor photoelectrodes featuring hindered carrier transport.

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