Enhanced photoelectrochemical performance of WO3 film with HfO2 passivation layer

Liu, Yang; Li, Jie; Li, Wenzhang; Liu, Qiong; Yang, Yang; Li, Yaomin; Chen, Qiyuan

doi:10.1016/j.ijhydene.2015.05.018

Cited by 41 publications

(18 citation statements)

References 55 publications

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“…The change of surface traps population expediate the water photooxidation kinetics and boost the PEC performance. Li et al loaded HfO 2 overlayer on the surface of WO 3 nanoparticles by a simple solvothermal method . The photocurrent of WO 3 /HfO 2 electrode was 0.26 mA cm −2 at 0.8 V versus Ag/AgCl, which was 1.24 fold of that of the WO 3 film.…”

Section: Surface Modificationmentioning

confidence: 99%

Tungsten Trioxide Nanostructures for Photoelectrochemical Water Splitting: Material Engineering and Charge Carrier Dynamic Manipulation

Wang

Tian

Chen

et al. 2019

Adv Funct Materials

141

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To address the energy crisis and environmental problems, the applications of solar energy have received intensive attention. Converting solar energy to hydrogen using a photoelectrochemical (PEC) cell is one of the most promising approaches to meet future energy demands. As an earth abundant metal oxide, tungsten trioxide (WO3), which has a moderate band gap (2.5–2.7 eV), ideal valence band position, and high resistance to photocorrosion, has been widely utilized in PEC photoanodes. To obtain a WO3 photoanode with high PEC efficiency, tremendous efforts have been made to improve the light absorption capacity, charge carrier dynamics, and oxygen evolution activity. In this report, the recent advances in WO3 photoanode optimization, including morphology design, dopants doping, heterojunction fabrication, and surface modification are summarized. In this review, these developments and representative applications of WO3 photoanodes in unassisted water splitting devices are also discussed. Finally, perspectives on the significant challenges and future prospects for the development of WO3 photoanodes for PEC water splitting are provided.

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Section: Surface Modificationmentioning

confidence: 99%

Tungsten Trioxide Nanostructures for Photoelectrochemical Water Splitting: Material Engineering and Charge Carrier Dynamic Manipulation

Wang

Tian

Chen

et al. 2019

Adv Funct Materials

141

View full text Add to dashboard Cite

show abstract

“…In the case of pure WO 3 , a broad absorption band in the wavenumber range of 420-1000 cm −1 attributed to the vibration modes of the W-O bond verifies the formation of tungsten(VI) oxide. The strong bands in 745 cm −1 and 818 cm −1 are assigned to the stretching mode of W-O-W [24]. These peaks probably overlap with a band located at 946 cm −1 , attributed to W=O stretching vibration [25,26].…”

Section: Characterization Of Photocatalystsmentioning

confidence: 93%

Pilot-Scale Studies of WO3/S-Doped g-C3N4 Heterojunction toward Photocatalytic NOx Removal

et al. 2022

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Due to the rising concentration of toxic nitrogen oxides (NOx) in the air, effective methods of NOx removal have been extensively studied recently. In the present study, the first developed WO3/S-doped g-C3N4 nanocomposite was synthesized using a facile method to remove NOx in air efficiently. The photocatalytic tests performed in a newly designed continuous-flow photoreactor with an LED array and online monitored NO2 and NO system allowed the investigation of photocatalyst layers at the pilot scale. The WO3/S-doped-g-C3N4 nanocomposite, as well as single components, were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer–Emmett–Teller surface area analysis (BET), X-ray fluorescence spectroscopy (XRF), X-ray photoemission spectroscopy method (XPS), UV–vis diffuse reflectance spectroscopy (DR/UV–vis), and photoluminescence spectroscopy with charge carriers’ lifetime measurements. All materials exhibited high efficiency in photocatalytic NO2 conversion, and 100% was reached in less than 5 min of illumination under simulated solar light. The effect of process parameters in the experimental setup together with WO3/S-doped g-C3N4 photocatalysts was studied in detail. Finally, the stability of the composite was tested in five subsequent cycles of photocatalytic degradation. The WO3/S-doped g-C3N4 was stable in time and did not undergo deactivation due to the blocking of active sites on the photocatalyst’s surface.

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“…Similarly, other OECs such as CoO x [90], NiFe layer double hydroxide (LDH) [91], and Mn-based catalysts [92] can also enhance the PEC performances of the WO 3 photoanodes. Interestingly, HfO 2 coated on the WO 3 surfaces as a passivation layer can also reduce the recombination of the photogenerated electron-hole pairs, resulting in better PEC performances [93,94]. Proper nanostructures can shorten the migration distance of the photogenerated electron-hole pairs, and provide more active sites for the surface reactions, which are effective to reduce the charge recombination.…”

Section: Binary Oxidesmentioning

confidence: 99%

Recent progress of tungsten- and molybdenum-based semiconductor materials for solar-hydrogen production

Wang

2019

Tungsten

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Semiconductor-based solar water splitting is regarded as one of the most promising technologies for clean hydrogen production. The rational design of semiconductor materials is critically important to achieve high solar-to-hydrogen (STH) conversion efficiencies towards practical applications. A rich family of tungsten-and molybdenum-based materials have been developed as both photocatalysts and cocatalysts for solar-hydrogen production in the past years, providing more opportunities to achieve high solar-to-hydrogen (STH) efficiencies. In this review article, we comprehensively review the recent progress of tungsten-and molybdenum-based materials for solar-hydrogen production. In particular, the strengths and drawbacks of each material system are critically discussed, followed by an overview of the emerging strategies to improve their performances. Finally, the key challenges and possible research directions of tungsten-and molybdenum-based materials are presented, which would provide useful information for the design of efficient semiconductor materials for solar-hydrogen production.

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Enhanced photoelectrochemical performance of WO3 film with HfO2 passivation layer

Cited by 41 publications

References 55 publications

Tungsten Trioxide Nanostructures for Photoelectrochemical Water Splitting: Material Engineering and Charge Carrier Dynamic Manipulation

Tungsten Trioxide Nanostructures for Photoelectrochemical Water Splitting: Material Engineering and Charge Carrier Dynamic Manipulation

Pilot-Scale Studies of WO3/S-Doped g-C3N4 Heterojunction toward Photocatalytic NOx Removal

Recent progress of tungsten- and molybdenum-based semiconductor materials for solar-hydrogen production

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