Uniformly citrate-assisted deposition of small-sized FeOOH on BiVO4 photoanode for efficient solar water oxidation

Xiong, Xianqiang; Zhang, Chuanqun; Zhang, Xiao; Fan, Liya; Zhou, Lujia; Chu, Yuxiao; Huang, Weiya; Wu, Chenglin; Jiang-shan, LI; Yang, Xiaogang; Han, Deman

doi:10.1016/j.electacta.2021.138795

Cited by 24 publications

(12 citation statements)

References 47 publications

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“…FeOOH was prepared on the surface of NiCo 2 O 4 under similar conditions and used as a cocatalyst for oxygen evolution . Notably, FeOOH has been widely studied as the oxygen evolution cocatalyst for the BiVO 4 photoanodes, which has been prepared on the BiVO 4 surface by various methods, such as photoelectrodeposition (anodic deposition), hydrothermal treatment, and solution immersion. − …”

Section: Introductionmentioning

confidence: 99%

Boosting the Performance of BiVO₄ Photoanodes by the Simultaneous Introduction of Oxygen Vacancies and Cocatalyst via Photoelectrodeposition

Sun

Ren

2022

ACS Appl. Mater. Interfaces

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Photoelectrochemical (PEC) water splitting is a promising way to convert solar energy into hydrogen energy, but the efficiency is limited by severe charge recombination especially in photoanodes. Herein, to reduce the charge recombination in the bulk phase and at the surface of the BiVO 4 photoanodes, oxygen vacancy introduction and cocatalyst loading were realized simultaneously by one-step photocathode deposition. A unique re-BiVO 4 /FeOOH photoanode was obtained by the photocathodic reduction of BiVO 4 in an electrolyte containing Fe 3+ , where the oxygen vacancies were introduced during the reduction process and the deposition of the FeOOH cocatalyst on the surface was induced by the generated OH − . When used for PEC water oxidation, the obtained re-BiVO 4 /FeOOH photoanode achieved an excellent PEC performance with a photocurrent density of 5.35 mA/cm 2 at 1.23 V versus RHE under AM 1.5G illumination, which was considerably higher than those for the pristine BiVO 4 photoanode (2.88 mA/cm 2 ) and the re-BiVO 4 photoanode obtained by photocathodic reduction without Fe 3+ (4.32 mA/cm 2 ). After further modification with a cobalt silicate (Co-Sil) cocatalyst, the resultant re-BiVO 4 /FeOOH/Co-Sil photoanode exhibited a photocurrent density as high as 6.10 mA/cm 2 at 1.23 V versus RHE and a remarkable applied bias photon-to-current efficiency of 2.25%. The outstanding performance of the re-BiVO 4 /FeOOH/Co-Sil photoanode could be attributed to the coexistence of plenty of oxygen vacancies in BiVO 4 reducing recombination of photogenerated carriers, the FeOOH cocatalyst interlayer as a hole-transport layer, and the outer Co-Sil cocatalyst with a high activity toward oxygen evolution. This work may open a new avenue toward multifunctional modifications of photoanode systems for efficient solar conversion.

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Section: Introductionmentioning

confidence: 99%

Boosting the Performance of BiVO₄ Photoanodes by the Simultaneous Introduction of Oxygen Vacancies and Cocatalyst via Photoelectrodeposition

Sun

Ren

2022

ACS Appl. Mater. Interfaces

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“…The negative shift of the flat potential is regarded to increase the band bending, thus promote the interfacial hole transfer of the hydroxylated BiVO 4 photoanodes. 49…”

Section: Resultsmentioning

confidence: 99%

Enhanced photoelectrochemical water oxidation over a surface-hydroxylated BiVO₄photoanode: advantageous charge separation and water dissociation

Li¹,

Xie²,

Sun³

et al. 2023

New J. Chem.

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“…To better understand the intrinsic PEC performance of the as-prepared SnWO 4 film photoanodes, the electrochemical surface area (ECSA) of the two photoanodes was studied. It was evaluated from the estimated double-layer capacitance ( C dl ) of the electrode. , To obtain the C dl values, cyclic voltammogram measurements were performed in a non-Faradaic region (0.21–0.41 V vs RHE) at diverse scan rates of 20, 40, 60, 80, and 100 mV s –1 (Figure c,d). The larger slope implies a larger electrochemically active surface area.…”

Section: Resultsmentioning

confidence: 99%

“…It was evaluated from the estimated double-layer capacitance (C dl ) of the electrode. 42,43 To obtain the C dl values, cyclic voltammogram measurements were performed in a non-Faradaic region (0.21−0.41 V vs RHE) at diverse scan rates of 20, 40, 60, 80, and 100 mV s −1 (Figure 5c,d). The larger slope implies a larger electrochemically active surface area.…”

Section: Preparation Of the 2d Snwo 4 Nanosheet Array Filmmentioning

confidence: 99%

Constructing a Two-Dimensional SnWO₄ Nanosheet Array Film for Enhanced Photoelectrochemical Performance

Qiu

et al. 2022

ACS Appl. Energy Mater.

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Stannous tungstate (α-SnWO4) is a promising photoanode material for photoelectrochemical (PEC) water splitting, but its practical performance is severely limited by the charge recombination problem that results from poor bulk charge transport ability. Herein, SnWO4 with a two-dimensional (2D) sheet-like array morphology (SnWO4-NS) was formed to provide pathways for accelerating charge transport, which is demonstrated by the small radius of electrochemical impedance spectroscopy and a short charge transport time of intensity-modulated photocurrent spectroscopy. The carrier separation efficiency and hole collection efficiency of SnWO4-NS were improved to 6.84 and 40.66% compared to those (4.83 and 13.18%) of SnWO4 without controlled morphology at 1.23 V versus the reversible hydrogen electrode. As a result, the photocurrent density increased from 0.086 to0.41 mA cm–2, and a larger amount of oxygen was obtained in the same period. This 2D morphology modification method will provide a new idea for developing α-SnWO4 with efficient PEC performance.

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Uniformly citrate-assisted deposition of small-sized FeOOH on BiVO4 photoanode for efficient solar water oxidation

Cited by 24 publications

References 47 publications

Boosting the Performance of BiVO₄ Photoanodes by the Simultaneous Introduction of Oxygen Vacancies and Cocatalyst via Photoelectrodeposition

Boosting the Performance of BiVO₄ Photoanodes by the Simultaneous Introduction of Oxygen Vacancies and Cocatalyst via Photoelectrodeposition

Enhanced photoelectrochemical water oxidation over a surface-hydroxylated BiVO₄photoanode: advantageous charge separation and water dissociation

Constructing a Two-Dimensional SnWO₄ Nanosheet Array Film for Enhanced Photoelectrochemical Performance

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Uniformly citrate-assisted deposition of small-sized FeOOH on BiVO4 photoanode for efficient solar water oxidation

Cited by 24 publications

References 47 publications

Boosting the Performance of BiVO4 Photoanodes by the Simultaneous Introduction of Oxygen Vacancies and Cocatalyst via Photoelectrodeposition

Boosting the Performance of BiVO4 Photoanodes by the Simultaneous Introduction of Oxygen Vacancies and Cocatalyst via Photoelectrodeposition

Enhanced photoelectrochemical water oxidation over a surface-hydroxylated BiVO4photoanode: advantageous charge separation and water dissociation

Constructing a Two-Dimensional SnWO4 Nanosheet Array Film for Enhanced Photoelectrochemical Performance

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Boosting the Performance of BiVO₄ Photoanodes by the Simultaneous Introduction of Oxygen Vacancies and Cocatalyst via Photoelectrodeposition

Boosting the Performance of BiVO₄ Photoanodes by the Simultaneous Introduction of Oxygen Vacancies and Cocatalyst via Photoelectrodeposition

Enhanced photoelectrochemical water oxidation over a surface-hydroxylated BiVO₄photoanode: advantageous charge separation and water dissociation

Constructing a Two-Dimensional SnWO₄ Nanosheet Array Film for Enhanced Photoelectrochemical Performance