Preparation and photoelectrocatalytic activity of a nano-structured WO3 platelet film

Yagi, Masayuki; Maruyama, Syou; Sone, Koji; Nagai, Keiji; Norimatsu, T.

doi:10.1016/j.jssc.2007.11.018

Cited by 106 publications

(64 citation statements)

References 24 publications

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“…The extensive efforts in combinatorial research, particularly with regard to the use of metal oxides as catalytic absorbers [29][30][31][32][33] would transcend the scope of this article which is focusing on the neighbouring scientific areas of our own work on catalysis with non-oxidic materials. Achieving the goal of multiple photon catalysis with oxides, for example, demands a much more advanced control of the materials science aspects of such compounds, as tandem-type structures have to be created.…”

mentioning

confidence: 99%

Photoelectrocatalysis: principles, nanoemitter applications and routes to bio-inspired systems

Lewerenz

Heine

Skorupska

et al. 2010

Energy Environ. Sci.

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An overview on processes that are relevant in light-induced fuel generation, such as water photoelectrolysis or carbon dioxide reduction, is given. Considered processes encompass the photophysics of light absorption, excitation energy transfer to catalytically active sites and interfacial reactions at the catalyst/solution phase boundary. The two major routes envisaged for realization of photoelectrocatalytic systems, e.g. bio-inspired single photon catalysis and multiple photon inorganic or hybrid tandem cells, are outlined. For development of efficient tandem cell structures that are based on non-oxidic semiconductors, stabilization strategies are presented. Physical surface passivation is described using the recently introduced nanoemitter concept which is also applicable in photovoltaic (solid state or electrochemical) solar cells and first results with p-Si and p-InP thin films are presented. Solar-to-hydrogen efficiencies reach 12.1% for homoepitaxial InP thin films covered with Rh nanoislands. In the pursuit to develop biologically inspired systems, enzyme adsorption onto electrochemically nanostructured silicon surfaces is presented and tapping mode atomic force microscopy images of heterodimeric enzymes are shown. An outlook towards future envisaged systems is given.

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confidence: 99%

Photoelectrocatalysis: principles, nanoemitter applications and routes to bio-inspired systems

Lewerenz

Heine

Skorupska

et al. 2010

Energy Environ. Sci.

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“…Figure 1 shows SEM micrographs of undoped WO 3 and Fe-doped WO 3 on FTO glass. The morphology of undoped WO 3 is different from the WO 3 thin film prepared by Yagi et al [35] using similar method. In their study, tungstic acid was dissolved in ammonia aqueous and PEG was added but the film produced was covered with micro-scale plates.…”

Section: Methodsmentioning

confidence: 73%

FABRICATION AND CHARACTERIZATION OF Fe-DOPED TUNGSTEN TRIOXIDE PHOTOELECTRODES IN AQUEOUS MEDIUM USING TUNGSTIC ACID AND FERROCENE AS STARTING MATERIALS

Hang

Jaafar

Minggu³

et al. 2016

MJAS

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Different compositions of Fe-doped tungsten trioxide thin films were synthesized on fluorine-doped tin oxide (FTO) glass substrate by sol-gel method, with ferrocene and tungstic acid as starting materials. The synthesized thin films was characterized with X-ray diffraction (XRD), scanning electron microscope (SEM), UV/Vis spectrophotometer and photoelectrochemical (PEC) analysis. The results show that the surface morphology of the thin films became rough and the grain size increased along with the concentration of Fe. Monoclinic structure of tungsten trioxide was obtained for all doped and undoped WO 3 and red-shift can be observed from UV-vis spectrum. Band gap reduced from 2.74 eV of undoped WO 3 thin films to 2.60 eV of 20 % Fe-doped WO 3 thin films. Photoactivities of all Fe-doped WO 3 are higher than undoped thin films. The highest photoactivities contributed by 5 % Fe-doped WO 3 films with photocurrent densities measured was 0.148 mA/cm 2 , which is 3 times higher compared to undoped WO 3 .Keywords: Fe-doped WO 3 , direct water splitting, photoelectrochemical cell, photoanode Abstrak Filem nipis tungsten trioksida terdop Fe berbagai komposisi telah disediakan di atas kaca substrat FTO (fluorine-doped tin oxide) dengan kaedah sol-gel, dengan menggunakan ferosin dan asid tingstik sebagai bahan pemula. Filem nipis yang terhasil kemudiannya dicirikan dengan pembelauan sinar X (XRD), mikroskopi elektron pengimbasan (SEM), UV/Vis spektrofotometer dan analisis fotoelektrokimia. Keputusan menunjukkan bahawa morfologi permukaan filem nipis menjadi kasar dan saiz butiran bertambah dengan penambahan kepekatan Fe. Tungsten trioksida yang berstruktur monoklinik telah dihasilkan dan anjakan merah telah diperhatikan di dalam spectrum UV-vis. Jurang tenaga telah berkurang dari 2.74 eV (WO 3 tulen) kepada 2.60 eV (20 % Fe-dop WO 3 ). Fotoaktiviti WO 3 terdop Fe adalah lebih tinggi berbanding WO 3 tulen. Fotoaktiviti yang tertinggi dicatatkan oleh filem 5 % WO 3 terdop Fe dengan ketumpatan fotoarus 0.148 mA/cm 2 . Ia adalah 3 kali ganda lebih tinggi berbanding WO 3 tulen.Kata kunci: Fe-dop WO 3 , pembelahan air secara langsung, sel fotoelektrokimia, fotoanod

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“…1 Since Fujishima and Honda used single crystal TiO 2 as a photocatalyst for the splitting of water under UV-light irradiation in 1972, 2 photocatalytic and photoelectrochemical (PEC) water splitting on semiconducting materials to convert solar energy into chemical energy has been studied extensively. Among the numerous transition metal oxides, WO 3 has been considered to be a promising alternative for solar water splitting, because of its suitable band gap ($2.65 eV) for visible light absorption, 6 good electron transport properties, 7 resilience to photocorrosion, 8 good stability in acidic solution, 9 moderate hole diffuse length ($150 nm), 10 and a positive enough valence band (VB) edge to provide a sufficient driving force for oxygen evolution. 3 For conventional TiO 2 photocatalyst, the narrow optical absorption range is a major problem because of its wide band gap (3.0 eV for rutile and 3.2 eV for anatase).…”

Section: Introductionmentioning

confidence: 99%

In situ synthesis of g-C₃N₄/WO₃ heterojunction plates array films with enhanced photoelectrochemical performance

Zhan

Xie

et al. 2015

RSC Adv.

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heterojunction plate array films with enhanced photoelectrochemical (PEC) performance were successfully synthesized through a combination of hydrothermal and dipping-annealing methods.Urea aqueous solutions were prepared as the precursors to in situ synthesize g-C 3 N 4 nanoparticles on the surface of WO 3 platelets. The PEC performances of the photoanodes were investigated by the photocurrent density and incident photon-to-current conversion efficiency (IPCE). As-prepared g-C 3 N 4 /WO 3 heterojunction films achieved a maximum photocurrent density of 2.10 mA cm À2 at +2.0 V (vs. RHE), which was almost 3-fold higher than that of the pure WO 3 film (0.78 mA cm À2 ) under illumination. And the highest IPCE value increased from 25.1% to 53.1% after the g-C 3 N 4 nanoparticles deposition. The enhanced PEC performance was attributed to the increased carriers density, better electron transport properties, longer electron lifetime and effective charge separation at the interface of heterojunction, which were confirmed by Mott-Schottky and electrochemical impedance spectroscopy (EIS). This study demonstrates that the low-dimensional morphological structure and in situ formation of heterojunction structure are expected to provide a promising photoanode for photoelectric catalysis.

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Preparation and photoelectrocatalytic activity of a nano-structured WO3 platelet film

Cited by 106 publications

References 24 publications

Photoelectrocatalysis: principles, nanoemitter applications and routes to bio-inspired systems

Photoelectrocatalysis: principles, nanoemitter applications and routes to bio-inspired systems

FABRICATION AND CHARACTERIZATION OF Fe-DOPED TUNGSTEN TRIOXIDE PHOTOELECTRODES IN AQUEOUS MEDIUM USING TUNGSTIC ACID AND FERROCENE AS STARTING MATERIALS

In situ synthesis of g-C₃N₄/WO₃ heterojunction plates array films with enhanced photoelectrochemical performance

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Preparation and photoelectrocatalytic activity of a nano-structured WO3 platelet film

Cited by 106 publications

References 24 publications

Photoelectrocatalysis: principles, nanoemitter applications and routes to bio-inspired systems

Photoelectrocatalysis: principles, nanoemitter applications and routes to bio-inspired systems

FABRICATION AND CHARACTERIZATION OF Fe-DOPED TUNGSTEN TRIOXIDE PHOTOELECTRODES IN AQUEOUS MEDIUM USING TUNGSTIC ACID AND FERROCENE AS STARTING MATERIALS

In situ synthesis of g-C3N4/WO3 heterojunction plates array films with enhanced photoelectrochemical performance

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In situ synthesis of g-C₃N₄/WO₃ heterojunction plates array films with enhanced photoelectrochemical performance