In<sup>3+</sup>-doped BiVO<sub>4</sub> photoanodes with passivated surface states for photoelectrochemical water oxidation

Zhong, Xiaohui; He, Huichao; Yang, Minji; Ke, Gaili; Zhao, Zong‐Yan; Dong, Faqin; Wang, Bowen; Chen, Yaqi; Shi, Xian-ying; Zhou, Yong

doi:10.1039/c8ta01377b

Cited by 86 publications

(50 citation statements)

References 43 publications

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“…N‐type semiconductors are usually used as photoanodes for the oxygen evolution reaction (OER) in the process of PEC water splitting, while single n‐type semiconductors tend to exhibit poor surface water oxidation kinetics . Oxygen evolution co‐catalysts (OECs) have been introduced onto photoanodes to improve the rate of oxygen generation .…”

Section: Introductionmentioning

confidence: 99%

Improvement of BiVO₄ Photoanode Performance During Water Photo‐Oxidation Using Rh‐Doped SrTiO₃ Perovskite as a Co‐Catalyst

Zhang

et al. 2019

Adv Funct Materials

121

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In this work, a water splitting photoanode composed of a BiVO 4 thin film surface modified by the deposition of a rhodium (Rh)-doped SrTiO 3 perovskite is fabricated, and the Rh-doped SrTiO 3 outer layer exhibits special photoelectrochemical (PEC) oxygen evolution co-catalytic activity. Controlled intensity modulated photo-current spectroscopy, electrochemical impedance spectroscopy, and other electrochemical results indicate that the Rh on the perovskite provide an oxidation active site during the PEC water oxidation process by reducing the reaction energy barrier for water oxidation. Theoretical calculations indicate that the water oxidation reaction is more likely to occur on the (110) crystal plane of Rh-SrTiO 3 because the oxygen evolution reaction overpotential on the (110) crystal plane is reduced significantly. Therefore, the obtained BiVO 4 /Rh5%-SrTiO 3 photoanode exhibits an optimized PEC performance. In particular, it facilitates the saturation of the photocurrent density. Thus, the presence of doped Rh in SrTiO 3 can reduce the amount of noble metals required while achieving excellent and stable oxygen evolution properties.

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Section: Introductionmentioning

confidence: 99%

Improvement of BiVO₄ Photoanode Performance During Water Photo‐Oxidation Using Rh‐Doped SrTiO₃ Perovskite as a Co‐Catalyst

Zhang

et al. 2019

Adv Funct Materials

121

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“…Both W‐BVO and BiVO 4 exhibit the linear relationship of positive slope, and this result suggests that the doping of W did not alter the nature of n‐type semiconductor of BiVO 4 . For n‐type semiconductors, the capacitance of space charge region ( C SC ) and applied voltage ( E ) takes a relationship as the following formula 37,38 :

\frac{1}{C_{SC}^{2}} = \frac{2}{ε_{0} ε_{r} N_{D} A^{2}} ((), E - E_{fb} - \frac{kT}{e}) = \frac{2}{e ε_{0} ε_{r}} ([], \frac{1}{slope})

…”

Section: Resultsmentioning

confidence: 99%

A simple flame strategy for constructing W‐doped BiVO ₄ photoanodes with enhanced photoelectrochemical water splitting

et al. 2020

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Summary Bismuth vanadate (BiVO4) with narrow band gap has been widely reported in photoelectrochemical (PEC) water splitting. However, the low kinetic of water splitting is still the key for limiting the PEC performance of BiVO4. Herein, a W‐doped BiVO4 (W‐BVO) photoanode has been controllably prepared by a fast flame method within 40 seconds. The preparation condition including calcination time and quantity of W precursor has been systemically investigated, in order to optimize the PEC performance of W‐BVO. X‐ray photoelectron spectroscopy indicates that the introduction of W did not obviously cause the formation of oxygen vacancies, revealing that W has been doped into the crystal structure of BiVO4 by flame method. The electrochemical impedance spectroscopy further confirmed that the W‐BVO possesses a lower charge transfer resistance with fast transfer ability of carriers. Based on the incident photon‐to‐electron conversion efficiency, the acceptable solar to electron conversion efficiency of 5.79% (340 nm, 1.23 V vs RHE) has been achieved in the W‐BVO system. A PEC mechanism has been proposed to demonstrate the promotion of kinetic for PEC water splitting. This work offers a promising alternative route for the design and fabrication of efficient photoanodes in other PEC systems.

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“…The E fb is evaluated by extrapolating each plot to the x‐axis to get the intercept value. The N d can also be measured by following Equation :

true N_{d} = (2 / e ϵ_{0} ϵ) [d (1 / normalC^{2}) / d V]^{- 1} = (2 / e ϵ_{0} ϵ) [1 / slope]

…”

Section: Resultsmentioning

confidence: 99%

Boosting Water Splitting Performance of BiVO₄ Photoanode through Selective Surface Decoration of Ag₂S

et al. 2018

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The unsatisfactory of solar absorption and charge separation is the main loss limiting the conversion efficiency in photoelectrochemical water splitting system. Here, Ag 2 S/BiVO 4 heterostructure have been fabricated for the first time to PEC splitting water, achieving efficient solar-to-chemical energy conversion. The Ag 2 S nanoparticles evenly distributing on the surface of BiVO 4 not only promotes the charge separation, but also greatly facilitates the surface hole injection. The results show that the optimal Ag 2 S/BiVO 4 heterostructure reach a remarkable photocurrent density of 1.91 mA/cm 2 at 1.23 V (vs RHE) under 100 mW/cm 2 irradiation, which is approximately 3.2-fold higher than that of bare BiVO 4 . The incident photon-to-current efficiency (IPCE) of Ag 2 S/BiVO 4 heterostructure have been enhanced up to 23 % in visible region (V bias = 1.23 V, 460 nm). In addition, Ag 2 S/BiVO 4 shows the attracting stability during photoelectrochemical process, since its photocurrent density can keep for 92 % after 2 h. The charges transfer mechanism for Ag 2 S/BiVO 4 heterostructure were also proposed. This work provides a new insight for constructing efficient and stable photoanodes based on BiVO 4 .

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In³⁺-doped BiVO₄ photoanodes with passivated surface states for photoelectrochemical water oxidation

Abstract: In3+-doped BiVO4 film photoanodes with passivated surface states for efficient photoelectrochemical water oxidation.

Cited by 86 publications

References 43 publications

Improvement of BiVO₄ Photoanode Performance During Water Photo‐Oxidation Using Rh‐Doped SrTiO₃ Perovskite as a Co‐Catalyst

Improvement of BiVO₄ Photoanode Performance During Water Photo‐Oxidation Using Rh‐Doped SrTiO₃ Perovskite as a Co‐Catalyst

A simple flame strategy for constructing W‐doped BiVO ₄ photoanodes with enhanced photoelectrochemical water splitting

Boosting Water Splitting Performance of BiVO₄ Photoanode through Selective Surface Decoration of Ag₂S

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In3+-doped BiVO4 photoanodes with passivated surface states for photoelectrochemical water oxidation

Abstract: In3+-doped BiVO4 film photoanodes with passivated surface states for efficient photoelectrochemical water oxidation.

Cited by 86 publications

References 43 publications

Improvement of BiVO4 Photoanode Performance During Water Photo‐Oxidation Using Rh‐Doped SrTiO3 Perovskite as a Co‐Catalyst

Improvement of BiVO4 Photoanode Performance During Water Photo‐Oxidation Using Rh‐Doped SrTiO3 Perovskite as a Co‐Catalyst

A simple flame strategy for constructing W‐doped BiVO 4 photoanodes with enhanced photoelectrochemical water splitting

Boosting Water Splitting Performance of BiVO4 Photoanode through Selective Surface Decoration of Ag2S

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In³⁺-doped BiVO₄ photoanodes with passivated surface states for photoelectrochemical water oxidation

Improvement of BiVO₄ Photoanode Performance During Water Photo‐Oxidation Using Rh‐Doped SrTiO₃ Perovskite as a Co‐Catalyst

Improvement of BiVO₄ Photoanode Performance During Water Photo‐Oxidation Using Rh‐Doped SrTiO₃ Perovskite as a Co‐Catalyst

A simple flame strategy for constructing W‐doped BiVO ₄ photoanodes with enhanced photoelectrochemical water splitting

Boosting Water Splitting Performance of BiVO₄ Photoanode through Selective Surface Decoration of Ag₂S