Unique 3D heterojunction photoanode design to harness charge transfer for efficient and stable photoelectrochemical water splitting

Hou, Jungang; Cheng, Huijie; Takeda, Osamu; Zhu, Hongmin

doi:10.1039/c4ee03707c

Cited by 103 publications

(58 citation statements)

References 52 publications

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“…Accordingly, as‐established Bi 4 V 2 O 11 /CeO 2 forms a type I band alignment (Figure h) . This configuration can facilitate the interfacial electrons transfer from CeO 2 to Bi 4 V 2 O 11 as illustrated in Figure i, which can be verified by the drastic decrease of photoluminescence (PL) intensity (Supporting Information, Figure S14) . Remarkably, because amorphous structure can induce band bending for promoted charge transfer at interfaces, BVC‐A displays a much lower PL intensity (Figure g) and a smaller diameter of semicircular Nyquist plots (Supporting Information, Figure S15) relative to BVC‐C …”

Section: Methodsmentioning

confidence: 76%

An Amorphous Noble‐Metal‐Free Electrocatalyst that Enables Nitrogen Fixation under Ambient Conditions

et al. 2018

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N fixation by the electrocatalytic nitrogen reduction reaction (NRR) under ambient conditions is regarded as a potential approach to achieve NH production, which still heavily relies on the Haber-Bosch process at the cost of huge energy and massive production of CO . A noble-metal-free Bi V O /CeO hybrid with an amorphous phase (BVC-A) is used as the cathode for electrocatalytic NRR. The amorphous Bi V O contains significant defects, which play a role as active sites. The CeO not only serves as a trigger to induce the amorphous structure, but also establishes band alignment with Bi V O for rapid interfacial charge transfer. Remarkably, BVC-A shows outstanding electrocatalytic NRR performance with high average yield (NH : 23.21 μg h mg , Faradaic efficiency: 10.16 %) under ambient conditions, which is superior to the Bi V O /CeO hybrid with crystalline phase (BVC-C) counterpart.

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Section: Methodsmentioning

confidence: 76%

An Amorphous Noble‐Metal‐Free Electrocatalyst that Enables Nitrogen Fixation under Ambient Conditions

et al. 2018

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“…in less than 10 min (@ 1.2V vs. RHE). Recently, Hou et al 165 reported a non-metallic graphitic C 3 N 4 coated 3D structured n-TaON with CoO X co-catalyst that shows significantly enhanced photoelectrochemical stability (3 hours) under OER condition at pH 13.6 (1M NaOH). In addition, negative band offsets for both CB and VB (-1.0 eV and -0.5 eV, respectively) toward the TaON promote an effective charge separation for water oxidation reaction.…”

Section: Other Layersmentioning

confidence: 99%

Strategies for stable water splitting via protected photoelectrodes

et al. 2017

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Photoelectrochemical (PEC) solar-fuel conversion is a promising approach to provide clean and storable fuel (e.g., hydrogen and methanol) directly from sunlight, water and CO. However, major challenges still have to be overcome before commercialization can be achieved. One of the largest barriers to overcome is to achieve a stable PEC reaction in either strongly basic or acidic electrolytes without degradation of the semiconductor photoelectrodes. In this work, we discuss fundamental aspects of protection strategies for achieving stable solid/liquid interfaces. We then analyse the charge transfer mechanism through the protection layers for both photoanodes and photocathodes. In addition, we review protection layer approaches and their stabilities for a wide variety of experimental photoelectrodes for water reduction. Finally, we discuss key aspects which should be addressed in continued work on realizing stable and practical PEC solar water splitting systems.

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“…Calculated from UV/Vis DRS (Supporting Information, Figure S13), the band gap values are 2.15 and 3.05 eV for Bi 4 V 2 O 11 and CeO 2 ,r espectively,a s shown in the corresponding Kubelka-Munk plot (Figure 2f). [45] Remarkably,because amorphous structure can induce band bending for promoted charge transfer at interfaces,B VC-A displays am uch lower PL intensity (Figure 2g)a nd as maller diameter of semicircular Nyquist plots (Supporting Information, Figure S15) relative to BVC-C. [46] Another key advantageous feature of designed BVC-A is the integration of amorphous Bi 4 V 2 O 11 with band alignment that may deliver abundant active sites and facilitated electron transport for effective N 2 fixation. [44] This configuration can facilitate the interfacial electrons transfer from CeO 2 to Bi 4 V 2 O 11 as illustrated in Figure 2i,which can be verified by the drastic decrease of photoluminescence (PL) intensity (Supporting Information, Figure S14).…”

Section: Angewandte Chemiementioning

confidence: 99%

An Amorphous Noble‐Metal‐Free Electrocatalyst that Enables Nitrogen Fixation under Ambient Conditions

et al. 2018

View full text Add to dashboard Cite

N 2 fixation by the electrocatalytic nitrogen reduction reaction (NRR) under ambient conditions is regarded as ap otential approach to achieve NH 3 production, which still heavily relies on the Haber-Boschp rocess at the cost of huge energy and massive production of CO 2 .Anoble-metal-free Bi 4 V 2 O 11 /CeO 2 hybrid with an amorphous phase (BVC-A) is used as the cathode for electrocatalytic NRR. The amorphous Bi 4 V 2 O 11 contains significant defects,w hichp lay ar ole as active sites.The CeO 2 not only serves as atrigger to induce the amorphous structure,but also establishes band alignment with Bi 4 V 2 O 11 for rapid interfacial charge transfer.R emarkably, BVC-A shows outstanding electrocatalytic NRR performance with high average yield (NH 3 :2 3.21 mgh À1 mg À1 cat. ,F aradaic efficiency:1 0.16 %) under ambient conditions,w hich is superior to the Bi 4 V 2 O 11 /CeO 2 hybrid with crystalline phase (BVC-C) counterpart.

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Unique 3D heterojunction photoanode design to harness charge transfer for efficient and stable photoelectrochemical water splitting

Abstract: The hierarchically CoOxdecorated 2D C3N4nanosheet–1D/2D nanorod/nanosheet-assembled barium-doped TaON array as 3D heterojunction photoanode exhibited the enhanced photocurrent density and durable photostability for photoelectrochemical solar water splitting.

Cited by 103 publications

References 52 publications

An Amorphous Noble‐Metal‐Free Electrocatalyst that Enables Nitrogen Fixation under Ambient Conditions

An Amorphous Noble‐Metal‐Free Electrocatalyst that Enables Nitrogen Fixation under Ambient Conditions

Strategies for stable water splitting via protected photoelectrodes

An Amorphous Noble‐Metal‐Free Electrocatalyst that Enables Nitrogen Fixation under Ambient Conditions

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