Enhanced Photocatalytic Efficiency Through Oxygen Vacancy‐Driven Molecular Epitaxial Growth of Metal–Organic Frameworks on BiVO₄

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 19, 2025

Abstract Efficient charge separation at the semiconductor/cocatalyst interface is crucial for high‐performance photoelectrodes, as it directly influences availability of surface charges solar water oxidation. However, establishing strong molecular‐level connections between these interfaces to achieve superior interfacial quality presents significant challenges. This study introduces an innovative electrochemical etching method that generates a high concentration oxygen vacancy sites on BiVO 4 surfaces (Ov‐BiVO ), enabling interactions with oxygen‐rich ligands MIL‐101. reduces formation energy and promotes conformal growth . The Ov‐BiVO /MIL‐101 composite exhibits ideal interface, achieving impressive photocurrent density 5.91 mA cm −2 1.23 V RHE , along excellent stability. high‐performing photoanode enables unbiased tandem device /MIL‐101‐Si cell system, solar‐to‐hydrogen efficiency 4.33%. integration mitigates states enhances internal electric field, facilitating migration photogenerated holes into MIL‐101 overlayer. process activates highly efficient Fe catalytic sites, which effectively adsorb molecules, lowering barrier oxidation improving kinetics. Further studies confirm broad applicability vacancy‐induced molecular epitaxial in various MOFs, offering valuable insights defect engineering optimizing enhancing photocatalytic activity.

Language: Английский

---

Combinational effect of NiFeOx/Tb(OH)x as hole extractor for enhanced charges separation and stability of BiVO4 photoanode for solar water splitting

Materials Today Advances, Journal Year: 2024, Volume and Issue: 25, P. 100554 - 100554

Published: Dec. 24, 2024

Language: Английский

---

Tailoring the Surface Termination of BiVO₄ Photoanodes Using Ammonium Metavanadate Enhances the Solar Water Oxidation Performance

ACS Energy Letters, Journal Year: 2024, Volume and Issue: 9(7), P. 3308 - 3315

Published: June 11, 2024

Altering the surface stoichiometry of semiconductor electrodes is known to affect photoelectrochemical (PEC) response. To date, several reports have hinted at influence Bi:V ratio on solar water oxidation performance BiVO4 photoanodes, but only a handful strategies been reported afford tuning such stoichiometry, while comprehensive understanding an atomic level role termination remains elusive. Herein, we report new methodology that modulates and maximizes PEC toward oxygen evolution reaction (OER). The presence ammonium metavanadate drastically reduces recombination improving charge separation. Detailed characterization revealed this treatment filled native vanadium vacancies, which usually act as centers, inducing significant increase in density reinforced built-in electric field drives Interestingly, coating with NiFeOx improves, especially, separation V-modified BiVO4. Results suggest altered energetics BiVO4, leading improved band alignment across interface. Overall, these results provide platform modulate thin films shedding light mechanisms by governs

Language: Английский

---

Surface-controlled oxygen vacancy-rich Bi/BiVO4 Schottky junction for highly selective and active photocatalytic nitrogen fixation

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 498, P. 155849 - 155849

Published: Sept. 16, 2024

Language: Английский

---

High-efficiency Photocatalytic Hydrogen and Oxygen Evolution Properties by Z-scheme Electron Transfer in BiVO4/C3N5 Heterostructure

Applied Catalysis B Environment and Energy, Journal Year: 2024, Volume and Issue: 362, P. 124766 - 124766

Published: Oct. 30, 2024

Language: Английский

---

Oxygen vacancy-suppression strengthened the internal electric field in ZnIn2S4/BiVO4 S-scheme heterojunction to boost photocatalytic removal of aqueous pollutants

Journal of environmental chemical engineering, Journal Year: 2024, Volume and Issue: 12(5), P. 113473 - 113473

Published: July 1, 2024

Language: Английский

---

Tailoring Carrier Dynamics of BiVO₄ Photoanode via Dual Incorporation of Au and Co(OH)_x Cooperative Modification for Photoelectrochemical Water Splitting

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 30, 2024

Abstract Photoelectrochemical solar to hydrogen production is a promising way achieve carbon neutrality, but severe charge recombination in photoanodes limits the conversion efficiency. Herein, Au nanoparticles and Co(OH) x co‐sensitized bismuth vanadate (BiVO 4 ) construct AuCo(OH) /BiVO photoanode for significantly enhancing performance of photoelectrochemical water splitting. This process improves bulk carrier separation efficiency, surface kinetics oxidation, electron density BiVO through plasmon resonance (SPR) oxygen evolution catalysts effect. Additionally, enhancement *O *OOH generation accelerate reaction kinetics. Consequently, constructed demonstrates an excellent photocurrent 6.2 mA cm −2 at 1.23 V versus reversible electrode stable continuous output within 42 h. work contributes developing high‐efficiency high‐stability H 2 SPR effect catalysts.

Language: Английский

---

Toward Efficient Utilization of Photogenerated Charge Carriers in Photoelectrochemical Systems: Engineering Strategies from the Atomic Level to Configuration

Chemical Reviews, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 21, 2024

Photoelectrochemical (PEC) systems are essential for solar energy conversion, addressing critical and environmental issues. However, the low efficiency in utilizing photogenerated charge carriers significantly limits overall conversion. Consequently, there is a growing focus on developing strategies to enhance photoelectrode performance. This review systematically explores recent advancements PEC system modifications, spanning from atomic nanoscopic levels configuration engineering. We delve into relationships between structures, intrinsic properties, kinetics of carriers, their utilization. Additionally, we propose future directions perspectives more efficient systems, offering valuable insights potential innovations field.

Language: Английский

---

Unequal {110} Facets: The Potential Role of Intraparticle Heterogeneity and Facet Termination in Photoelectrochemical Activity of Single BiVO₄ Particles

ACS Nano, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 3, 2025

BiVO4 photoanodes are promising for solar water splitting, with photogenerated electrons and holes preferentially reacting at top {010} lateral {110} facets, respectively. However, the mechanisms driving this facet-dependent reactivity remain unclear. Here, we investigate photocurrent material heterogeneity using correlative scanning photoelectrochemical microscopy (SPCM), electron beam induced current (EBIC) mapping, mid-IR scattering near-field optical (s-SNOM). SPCM measurements of 62 particles confirmed higher photocurrents facets compared to but unexpectedly revealed variations in among within same particle. Variations facet surface termination could explain intraparticle-level heterogeneity, consistent theoretical predictions. Nano-FTIR spectroscopy Raman microspectroscopy indicated significant materials chemistry individual that be attributed lattice vibration distortions enhance overlap between Bi 6s O 2p orbitals. The increased orbital is as it potentially increases hole mobility valence band explains charge separation efficiency observed maps. Facet-dependent electrical EBIC showed no space regions interfacet junctions or metal-BiVO4 contacts under vacuum, suggesting beneath unlikely transport drive water/sulfite oxidation. These findings indicate potential influence distinct bulk properties chemistries across different highlighting importance carefully controlling defects during sample growth optimize photocatalytic performance.

Language: Английский

---

Achieving photocatalytic water reduction and oxidation over narrow bandgap FeVO₄

Chemical Synthesis, Journal Year: 2025, Volume and Issue: 5(2)

Published: March 10, 2025

The exploration of novel oxide photocatalysts with narrow bandgaps is highly desirable for efficient photocatalytic water splitting. However, this rather challenging as reducing the bandgap generally leads to severe charge recombination in photocatalysts. To address these issues, present work demonstrates, first time, synthesis and application triclinic FeVO4 an absorption edge 575 nm visible-light-driven reduction oxidation. Based on it, Cr doping strategy implemented photocatalyst further promote separation splitting performance, achieving apparent quantum efficiency (AQE) 0.26% at 420 (± 15 nm) O2 evolution reaction. Detailed analysis shows that impurity level below conduction band minimum originating from 3d orbital formed after doping, facilitating prolonged enhanced separation. This inaugurates field particulate splitting, validates can be promoted by both which are promising developed solar energy conversion.

Language: Английский

---