Electrodeposited Ti-doped hematite photoanodes and their employment for photoelectrocatalytic hydrogen production in the presence of ethanol

Kalamaras, Evangelos; Dracopoulos, Vassilios; Sygellou, Lamprini; Lianos, Panagiotis

doi:10.1016/j.cej.2016.03.062

Cited by 38 publications

(10 citation statements)

References 35 publications

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“…In the case of short-chain alcohols, such as methanol and ethanol, the disagreement between the I insol and XRD intensity degradation was relatively large and less BiVO 4 dissolved than expected on the basis of the I insol value. This result reflects the sacrificial reagent effect reported in previous alcohol PEC decomposition studies. , Among the tested organic solvents, acetone and TBA were found to be good reagents for anti-photocorrosion of BiVO 4 ; these solvents were likewise evaluated to be very promising on the basis of their I insol values. We checked the acetone- and TBA-containing solutions after the PEC reactions.…”

Section: Results and Discussionsupporting

confidence: 80%

“…This result reflects the sacrificial reagent effect reported in previous alcohol PEC decomposition studies. 42,43 Among the tested organic solvents, acetone and TBA were found to be good reagents for anti-photocorrosion of BiVO 4 ; these solvents were likewise evaluated to be very promising on the basis of their I insol values. We checked the acetone-and TBA-containing solutions after the PEC reactions.…”

Section: + → +mentioning

confidence: 99%

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Acid-Resistant BiVO₄ Photoanodes: Insolubility Control by Solvents and Weak W Diffusion in the Lattice

Nakajima

Miseki

Tateno

et al. 2021

ACS Appl. Mater. Interfaces

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We have revealed for the first time that BiVO4 photoanodes can be used even in strong acid media by mixing organic solvents into the electrolyte and depositing multilayers with a WO3 bottom layer. In general, the BiVO4 photoanodes are photocorrosive, especially in acid solutions. However, this shortcoming has been overcome using a combination of the two aforementioned modifications. We deduced that the contribution of each mixing organic solvent for the anti-photocorrosion of BiVO4 in sulfuric acid solutions can be evaluated on the basis of a new empirical indicator that incorporates molecular density, the Hansen solubility parameter, and molecular polarizability. Acetone and tert-butyl alcohol were especially promising solvents for stabilizing BiVO4 in acid media. We confirmed that the mixed organic solvents stabilized surface-emergent Bi oxide species as a passivation layer, which was generated via multilayering with a WO3 bottom layer. During heat treatment in the fabrication process, W weakly diffused into the BiVO4 layer and a Bi oxide layer was formed on the outermost surface because of the Bi segregation that arose from the charge compensation between W6+ and V5+ in the BiVO4 lattice. The surface Bi oxide layer, which was protected by the mixed organic solvents, steadily served as a passivation layer for anti-photocorrosion of the underlying BiVO4 layer. We have confirmed that the BiVO4/WO3 photoanodes in acetone-mixed aqueous sulfuric acid solution reliably functioned for a photoelectrochemical reaction under simulated sunlight illumination, and photoelectrochemical production of S2O8 2– ions was confirmed under light irradiation at λ > 480 nm. These results suggest that the BiVO4-based photoanodes have significant potential for use in acid media in conjunction with very straightforward modifications.

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Section: Results and Discussionsupporting

confidence: 80%

Section: + → +mentioning

confidence: 99%

Acid-Resistant BiVO₄ Photoanodes: Insolubility Control by Solvents and Weak W Diffusion in the Lattice

Nakajima

Miseki

Tateno

et al. 2021

ACS Appl. Mater. Interfaces

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“…As a result, the prepared solution is not stagnant, and the CV quality is low. Many studies on electrodeposition of hematite thin films under the same conditions have been reported in literature, [24][25][26][27][28][29][30][31][32] but due to the reasons stated above, the CV plots are not shown. As shown in Fig.…”

Section: Cyclic Voltammetrymentioning

confidence: 99%

Effects of Annealing on Structural, Morphological, and Corrosion Properties of α-Fe2O3 Thin Films

Demircioğlu

Demir

2021

Journal of Elec Materi

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Hematite (Fe 2 O 3 ) thin films have been synthesized on indium tin oxide (ITO)coated glass substrate using an electrodeposition technique and the changes in their structure due to subsequent annealing at different temperatures investigated. The structural, optical, and morphological properties of Fe 2 O 3 thin films formed after annealing at temperatures of 500°C, 550°C, and 600°C after deposition were determined by x-ray diffraction (XRD) analysis, absorption spectroscopy, Raman spectroscopy, scanning electron microscopy (SEM), and atomic force microscopy (AFM). XRD analysis of the annealed electrodeposited samples revealed Fe 2 O 3 thin films with rhombohedral crystal structure. The energy bandgap of the Fe 2 O 3 films grown on ITO and annealed at different temperatures was calculated based on absorption measurements, yielding values between 2.0 eV and 2.2 eV. Raman peaks were observed between 210 cm À1 and 1305 cm À1 depending on the annealing temperature. SEM analysis clearly revealed the crystal structure belonging to Fe 2 O 3 and an increase in the particle size as the annealing temperature was increased. The surface roughness values (in the range from 11 nm to 46 nm) obtained from AFM images of the samples annealed at different temperatures were compatible with the average roughness values (in the range from 14 nm to 51 nm). The results of these analyses confirm that the structure of the a-Fe 2 O 3 thin films was improved by increasing the annealing temperature. Electrochemical impedance spectroscopy (EIS) and Tafel measurements enabled detailed examination of the corrosion behavior of the a-Fe 2 O 3 films deposited on the ITO substrate. Nyquist and Bode analyses were applied to determine the structural changes to the Fe 2 O 3 and its corrosion behavior. The R s values calculated with the help of Nyquist plots increased from 65.10 X cm 2 to 540.5 X cm 2 with increase of the annealing temperature, while the R ct values decreased from 64.29 9 10 9 X cm 2 to 1.142 X cm 2 after annealing. The corrosion current and potential parameters were also calculated from Tafel measurements after deposition and annealing at different temperatures.

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“…Fotomangkin yang difabrikasi masih tidak dapat memenuhi syarat untuk pengkomersialan. Pelbagai pengubahsuaian terhadap fotomangkin telah dilakukan, seperti pembentukan struktur nano (Baxter et al 2014), pengedopan ion (Kalamaras et al 2016;Ng et al 2012), penghasilan fotoelektrod berlapisan (Choudhary et al 2012), pemekaan foto dengan kompleks tak organik (Jaafar et al 2017;Mark-Lee et al 2012) dan penglibatan kesan resonans plasmon (Leong et al 2015;Sim et al 2014;Ye et al 2016).…”

Section: Pengenalanunclassified

Kesan Resonans Plasmon Aurum terhadap Prestasi Fotoelektrokimia Fotokatod Cu2O

Minggu²,

Jaafar

et al. 2018

JSM

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Dalam kajian ini, kesan lapisan Au di atas fotokatod kuprus oksida (Cu 2 O) terhadap tindak balas fotoelektrokimia telah diuji. Lapisan Cu 2 O dan Au ini telah disediakan di atas subtrak kaca stanum oksida terdop fluorin (FTO) dalam konfigurasi yang berlainan, melalui kaedah elektroendapan. Selepas itu, fotokatod ini dicirikan dengan mikroskopi elektron imbasan berpancaran medan (FESEM), spektroskopi ultra lembayung dan cahaya nampak (UV-Vis) dan analisis fotoelektrokimia. Daripada imej FESEM, lapisan Au telah berjaya diendapkan di atas substrak FTO dan permukaan Cu 2 O. Penyerapan plasmon Au pada julat cahaya nampak juga terbukti dan ia telah mempertingkatkan penggunaan cahaya nampak untuk tindak balas fotoelektrokimia. Oleh itu, prestasi fotoelektrokimia fotokatod Cu 2 O berplasmon telah meningkat secara ketara. Di bawah sinaran suria simulasi A.M 1.5, fotokatod Cu 2 O terapit Au telah menjanakan ketumpatan fotoarus yang tertinggi, iaitu ~4 kali ganda peningkatan berbanding prestasi fotokatod Cu 2 O tulen.

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Electrodeposited Ti-doped hematite photoanodes and their employment for photoelectrocatalytic hydrogen production in the presence of ethanol

Cited by 38 publications

References 35 publications

Acid-Resistant BiVO₄ Photoanodes: Insolubility Control by Solvents and Weak W Diffusion in the Lattice

Acid-Resistant BiVO₄ Photoanodes: Insolubility Control by Solvents and Weak W Diffusion in the Lattice

Effects of Annealing on Structural, Morphological, and Corrosion Properties of α-Fe2O3 Thin Films

Kesan Resonans Plasmon Aurum terhadap Prestasi Fotoelektrokimia Fotokatod Cu2O

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Electrodeposited Ti-doped hematite photoanodes and their employment for photoelectrocatalytic hydrogen production in the presence of ethanol

Cited by 38 publications

References 35 publications

Acid-Resistant BiVO4 Photoanodes: Insolubility Control by Solvents and Weak W Diffusion in the Lattice

Acid-Resistant BiVO4 Photoanodes: Insolubility Control by Solvents and Weak W Diffusion in the Lattice

Effects of Annealing on Structural, Morphological, and Corrosion Properties of α-Fe2O3 Thin Films

Kesan Resonans Plasmon Aurum terhadap Prestasi Fotoelektrokimia Fotokatod Cu2O

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Acid-Resistant BiVO₄ Photoanodes: Insolubility Control by Solvents and Weak W Diffusion in the Lattice

Acid-Resistant BiVO₄ Photoanodes: Insolubility Control by Solvents and Weak W Diffusion in the Lattice