Band Edge Engineering in BiVO<sub>4</sub>/TiO<sub>2</sub> Heterostructure: Enhanced Photoelectrochemical Performance through Improved Charge Transfer

Singh, Aadesh P.; Kodan, Nisha; Mehta, B. R.; Held, Alexander; Mayrhofer, Leonhard; Moseler, Michael

doi:10.1021/acscatal.6b00956

Cited by 127 publications

(86 citation statements)

References 54 publications

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“…Raman spectroscopy is further applied to disclose the structure and chemical information of these three samples. As shown in Figure (b), the detected peaks at 806, 715 and 270 cm −1 in the pure WO 3 film are assigned to the vibrational modes for monoclinic WO 3 , in line with the XRD results ,. As for WO 3 /porous‐BiVO 4 sample, the two group peaks at 325 and 365 cm −1 as well as 710 and 825 cm −1 are attributed to the asymmetric and symmetric bending vibration of VO 4 3− and V−O stretching mode in BiVO 4 , respectively .…”

Section: Resultssupporting

confidence: 84%

Ternary WO₃/Porous‐BiVO₄/FeOOH Hierarchical Architectures: Towards Highly Efficient Photoelectrochemical Performance

Hou

Song

et al. 2018

ChemElectroChem

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Developing photoanodes showing both a high solar harvesting efficiency and efficient charge separation/transfer is recognized as one of the key challenges for water splitting. In the presented work, we report a strongly coupled ternary WO3/porous‐BiVO4/FeOOH hierarchical architecture as photoanode for high PEC performance,which was constructed by unique foaming‐assisted electro‐spraying of porous BiVO4 frameworks and photodeposition of a FeOOH layer, respectively. As a proof of concept, the as‐fabricated WO3/porous‐BiVO4/FeOOH photoanode yielded a photocurrent density of ∼4.4 mA cm−2 at 1.23 V vs. RHE, ∼4 and 10 times higher than that of the BiVO4 and WO3 counterparts, respectively. Because of the surface passivation of FeOOH, the onset potential could be substantially reduced to ∼200 mV in the presence of sacrificial agent under AM 1.5G (100 mW cm−2) simulated sunlight illumination, which was lowered by ∼100 mV in comparison to those of BiVO4 and WO3 analogues. The mechanism for the enhanced PEC activities of ternary WO3/porous‐BiVO4/FeOOH hierarchical architectures was proposed.

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Section: Resultssupporting

confidence: 84%

Ternary WO₃/Porous‐BiVO₄/FeOOH Hierarchical Architectures: Towards Highly Efficient Photoelectrochemical Performance

Hou

Song

et al. 2018

ChemElectroChem

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“…The band alignment was confirmed by the optical bandgap from the UV-vis absorption spectra ( Figure S14b, Supporting Information) and the valence band edges measured by UPS. [61][62][63] Under light excitation, both BiVO 4 and TiO 2 can absorb photons and generate electron-hole pairs. [61][62][63] Under light excitation, both BiVO 4 and TiO 2 can absorb photons and generate electron-hole pairs.…”

Section: Resultsmentioning

confidence: 99%

Rational Design of 3D Hierarchical Ternary SnO₂/TiO₂/BiVO₄ Arrays Photoanode toward Efficient Photoelectrochemical Performance

Pan

Zhang

et al. 2019

Advanced Science

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light absorption and charge separation efficiency is a key step to boost the PEC performance. In the past decades, metal oxides such as TiO 2 , [5,6] Fe 2 O 3 , [7][8][9] and BiVO 4 [10][11][12] have been widely investigated as photoanodes for PEC water splitting due to the characteristics of excellent photoactivity, low cost, and good stability. Among them, BiVO 4 semiconductor is particularly attractive because it has a narrow band gap of ≈2.4 eV, suitable conduction band (0 V vs reversible hydrogen electrode, RHE) and valence band edges, high water splitting efficiency, and good chemical stability. [13][14][15][16][17][18] Nevertheless, the poor charge transport ability, short carrier diffusion lengths (≈70 nm), and high charge recombination rates of BiVO 4 greatly limit its practical PEC performance. To address these problems, various strategies such as morphology design, element doping, host-guest heterojunctions and surface modifications are developed to enhance the performance. [19][20][21][22][23][24] Nanostructured electrode design is one effective route to enhance the light absorption and charge transport ability. For instance, 1D nanorods, [25] 2D nanosheets, [26] 3D inverse opals, [27] 3D hierarchical structures, [28][29][30] and 3D brochosomes-like arrays [31] have been reported to enhance the light harvesting and charge transport performance. Besides, the host-guest heterojunction electrode using two or more dissimilar materials to take the task of charge transport and light absorption, respectively, is another popular strategy to promote the charge transport and suppress the recombination of electron-hole pairs. [32] For instance, BiVO 4 as a light absorber has been combined with various other semiconductors to form a type II configuration such as TiO 2 /BiVO 4 , [33][34][35][36][37][38] WO 3 /BiVO 4 , [39][40][41][42] SnO 2 /BiVO 4 , [43,44] and Fe 2 O 3 /BiVO 4 . [45] Among them, TiO 2 is very attractive due to its relatively negative flat band potential and good chemical stability. Nevertheless, the intrinsically low mobility of TiO 2 still greatly limits the overall performance of TiO 2 /BiVO 4 heterojunction photoanode.Herein, we report the rational design and fabrication of 3D hierarchical ternary SnO 2 /TiO 2 /BiVO 4 arrays as photoanode for photoelectrochemical water splitting by combining multiple routes of colloid microspheres template, hydrothermal, atomic layer deposition (ALD), and electrodeposition. In this electrode design, the hierarchically hollow SnO 2 microspheres@ nanosheets arrays act as skeletons to support the TiO 2 and BiVO 4 as a promising semiconductor absorber is widely investigated as photoanode in photoelectrochemical water splitting. Herein, the rational design of 3D hierarchical ternary SnO 2 /TiO 2 /BiVO 4 arrays is reported as photoanode for photoelectrochemical application, in which the SnO 2 hierarchically hollow microspheres core/nanosheets shell arrays act as conductive skeletons, while the sandwiched TiO 2 and surface BiVO 4 are working as hole blocking layer a...

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“…[134] As ynergetic effectb etween WO 3 :BiVO 4 has also been studied to understand the carrierd ynamics at the interface. [140] The origin of this transitioni sm ainly associated with distortion of the oxygen sublattice, which raises the valence band edge of TiO 2 .I na ddition, hydrogenationo fT iO 2 leads to ad rastic increasei nt he photocurrent density,a nd ac athodic shift is observed. [129] with permission from the American Chemical Society and from Ref.…”

Section: Heterojunctionmentioning

confidence: 99%

Recent Advances in Bismuth‐Based Nanomaterials for Photoelectrochemical Water Splitting

2017

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In recent years, bismuth-based nanomaterials have drawn considerable interest as potential candidates for photoelectrochemical (PEC) water splitting owing to their narrow band gaps, nontoxicity, and low costs. The unique electronic structure of bismuth-based materials with a well-dispersed valence band comprising Bi 6s and O 2p orbitals offers a suitable band gap to harvest visible light. This Review presents significant advancements in exploiting bismuth-based nanomaterials for solar water splitting. An overview of the different strategies employed and the new ideas adopted to improve the PEC performance of bismuth-based nanomaterials are discussed. Morphology control, the construction of heterojunctions, doping, and co-catalyst loading are several approaches that are implemented to improve the efficiency of solar water splitting. Key issues are identified and guidelines are suggested to rationalize the design of efficient bismuth-based materials for sunlight-driven water splitting.

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Band Edge Engineering in BiVO₄/TiO₂ Heterostructure: Enhanced Photoelectrochemical Performance through Improved Charge Transfer

Cited by 127 publications

References 54 publications

Ternary WO₃/Porous‐BiVO₄/FeOOH Hierarchical Architectures: Towards Highly Efficient Photoelectrochemical Performance

Ternary WO₃/Porous‐BiVO₄/FeOOH Hierarchical Architectures: Towards Highly Efficient Photoelectrochemical Performance

Rational Design of 3D Hierarchical Ternary SnO₂/TiO₂/BiVO₄ Arrays Photoanode toward Efficient Photoelectrochemical Performance

Recent Advances in Bismuth‐Based Nanomaterials for Photoelectrochemical Water Splitting

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Band Edge Engineering in BiVO4/TiO2 Heterostructure: Enhanced Photoelectrochemical Performance through Improved Charge Transfer

Cited by 127 publications

References 54 publications

Ternary WO3/Porous‐BiVO4/FeOOH Hierarchical Architectures: Towards Highly Efficient Photoelectrochemical Performance

Ternary WO3/Porous‐BiVO4/FeOOH Hierarchical Architectures: Towards Highly Efficient Photoelectrochemical Performance

Rational Design of 3D Hierarchical Ternary SnO2/TiO2/BiVO4 Arrays Photoanode toward Efficient Photoelectrochemical Performance

Recent Advances in Bismuth‐Based Nanomaterials for Photoelectrochemical Water Splitting

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Band Edge Engineering in BiVO₄/TiO₂ Heterostructure: Enhanced Photoelectrochemical Performance through Improved Charge Transfer

Ternary WO₃/Porous‐BiVO₄/FeOOH Hierarchical Architectures: Towards Highly Efficient Photoelectrochemical Performance

Ternary WO₃/Porous‐BiVO₄/FeOOH Hierarchical Architectures: Towards Highly Efficient Photoelectrochemical Performance

Rational Design of 3D Hierarchical Ternary SnO₂/TiO₂/BiVO₄ Arrays Photoanode toward Efficient Photoelectrochemical Performance