A highly enhanced photoelectrochemical performance of BiVO<sub>4</sub> photoanodes modified with CoPi groups by increasing energy band bending, accelerating hole separation and improving water oxidation kinetics

Fang, Wanqing; Ai, Qin; Lin, Yongbiao; Xv, Rongzi; Fu, Li

doi:10.1039/d1se01856f

Cited by 12 publications

(13 citation statements)

References 46 publications

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“…Thus, the CoPi can act as a hole scavenger and a redox mediator. 29 The gathered electrons on the SnS 2 surface can easily transfer to the metallic Ni 2 P surface. 46 Because Ni 2 P shows a low overpotential for hydrogen evolution due to the low Gibbs free energy of adsorption, the hydrogen evolution on Ni 2 P can be more easily triggered by photogenerated electrons than that on the SnS 2 surface.…”

Section: Improved Charge Separation and Catalytic Active Centersmentioning

confidence: 99%

Rational Synthesis of S-Scheme CdS/SnS₂ Photocatalysts with Isolated Redox Cocatalysts for Enhanced H₂ Production

Reddy,

Han,

Kim

et al. 2024

ACS Sustainable Chem. Eng.

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A novel quaternary composite (10-NT 6 /CC 8 ) comprising a heterostructure 1D CdS and 2D SnS 2 embedded with spatially separated redox cocatalysts (cobalt phosphate (CoPi) and nickel phosphide (Ni 2 P)) was prepared by successive hydrothermal steps. The structural and elemental characteristics have been investigated by transmission electron microscopy, X-ray/ultraviolet photoelectron spectroscopy, UV−vis diffuse reflectance spectra, and N 2 adsorption−desorption isotherms. The charge transfer at the interfaces resulted in reduced recombination and decay lifetimes, leading to a high charge carrier density, low charge transfer resistance, and better photocurrent density as evidenced by the photocurrent and photoluminescence studies. The in situ ESR measurements confirmed the production of highly capable redox charge carriers in the composite photocatalysts and confirmed the holemediated oxidation of lactic acid to produce hydrogen. Gibbs free energy from density functional theory calculations suggested that CoPi and Ni 2 P acted as favorable adsorption sites, which ultimately reduced the activation energy for the OER and HER reactions, respectively. 10-NT 6 /CC 8 showed commendable hydrogen (H 2 ) production activity (360.75 μL h −1 ) that was 30 times to that of the bare CdS (12.25 μL h −1 ). The 10-NT 6 /CC 8 photocatalyst even produced 44.81 μL h −1 H 2 from pure water (in the absence of a lactic acid scavenger) under solar light irradiation. The continuous time-on-stream hydrogen production experiments suggested the photostability of 10-NT 6 /CC 8 even after 7 days of continuous photoactivity. The data obtained by Mott−Schottky and UPS analysis displayed an S-scheme charge transfer mechanism between the CdS and SnS 2 heterojunction. The present work contributes to the design and development of various novel combinations of composite heterostructures and redox catalysts for improved photocatalytic hydrogen production.

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Section: Improved Charge Separation and Catalytic Active Centersmentioning

confidence: 99%

Rational Synthesis of S-Scheme CdS/SnS₂ Photocatalysts with Isolated Redox Cocatalysts for Enhanced H₂ Production

Reddy,

Han,

Kim

et al. 2024

ACS Sustainable Chem. Eng.

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“…In recent studies, transition metal phosphides (MeP) have proven to be excellent electrochemical oxygen evolution cocatalysts (OECs), 10 which possess higher electron transport properties than transition metal oxides. For example, CoPi, 11 NiP x , 12 FeNiP 13 and NiCoP. 14 The loading of a cocatalyst can increase the surface injection efficiency of photogenerated holes at the photoanode/electrolyte interface and accelerate the kinetic process of the surface water oxidation reaction, but it should be noted that a new interface of photoanode semiconductor/cocatalyst is introduced.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In situ integration of a cocatalyst and heterojunction to a WO₃ photoanode with enhanced photoelectrochemical performance via phosphatization

et al. 2023

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“…Once the solar light is illuminated on the TiO 2 photoanode, the electrons from the conduction band of TiO 2 and the electrons transferred from the heterojunction could be transported to the other electrode by the external circuit to participate in the hydrogen evolution reaction. In numerous narrow band gap semiconductors, BiVO 4 has been greatly researched as a narrow band gap semiconductor in recent years due to its attractive band structure and suitable band gap energy. − Inspired by these studies, we would like to combine an n-n heterojunction consisting of BiVO 4 and N-doped TiO 2 photoanode for simultaneously enhanced visible light absorption, charge separation, and transfer. Furthermore, the reaction mechanism is explored to understand the oxygen evolution reaction on the photoanode with inner doping and heterojunction combination during solar water splitting.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Charge Separation and Transfer by BiVO₄ Heterojunction and N-Doped for TiO₂ Nanotubes during Photoelectrochemical Water Splitting

Fu,

Lian,

Lin

et al. 2023

ACS Appl. Energy Mater.

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Photoelectrochemical water splitting for hydrogen and oxygen evolution by a TiO 2 photoanode is a promising strategy for clean energy generation. The BiVO 4 decorated N-Doped TiO 2 nanotubes (BiVO 4 /TiO 2 −N) were synthesized by the anodization and hydrothermal procedure. The physical and chemical characterization indicates that the BiVO 4 nanoparticles are successfully decorated on the surface of the TiO 2 −N nanotubes (∼600 nm) to form the heterojunction structure. After the nitrogen doping and BiVO 4 modification of TiO 2 , the UV−visible light absorption ability is broadened, the band gap energy shifts from 3.2 to around 2.82 eV, and the injection and separation efficiency of charge carriers is increased. Nitrogen doping and BiVO 4 modification have little effect on TiO 2 crystallization. The optimal photocurrent density of BiVO 4 /TiO 2 −N reached 1.02 mA/cm 2 at 1.23 V RHE , which is about 1.76-fold more than that of the TiO 2 photoanodes. The mechanism studies for BiVO 4 /TiO 2 −N indicate that the key factors for boosting PEC performance are the light absorption and the charge separation enhancement by the N-doping and the n−n heterojunction by BiVO 4 with the TiO 2 photoanode. The mechanism for the BiVO 4 /TiO 2 −N photoanode during the PEC water splitting process is proposed for further understanding and designation.

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A highly enhanced photoelectrochemical performance of BiVO₄ photoanodes modified with CoPi groups by increasing energy band bending, accelerating hole separation and improving water oxidation kinetics

Abstract: BiVO4 is one of the most attractive photoanode materials for photoelectrochemical water splitting. Herein, cobalt phosphate (CoPi) modified BiVO4 (BiVO4/CoPi) photoanode is prepared by electrodeposition. The physical and chemical characterization...

Cited by 12 publications

References 46 publications

Rational Synthesis of S-Scheme CdS/SnS₂ Photocatalysts with Isolated Redox Cocatalysts for Enhanced H₂ Production

Rational Synthesis of S-Scheme CdS/SnS₂ Photocatalysts with Isolated Redox Cocatalysts for Enhanced H₂ Production

In situ integration of a cocatalyst and heterojunction to a WO₃ photoanode with enhanced photoelectrochemical performance via phosphatization

Enhanced Charge Separation and Transfer by BiVO₄ Heterojunction and N-Doped for TiO₂ Nanotubes during Photoelectrochemical Water Splitting

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A highly enhanced photoelectrochemical performance of BiVO4 photoanodes modified with CoPi groups by increasing energy band bending, accelerating hole separation and improving water oxidation kinetics

Abstract: BiVO4 is one of the most attractive photoanode materials for photoelectrochemical water splitting. Herein, cobalt phosphate (CoPi) modified BiVO4 (BiVO4/CoPi) photoanode is prepared by electrodeposition. The physical and chemical characterization...

Cited by 12 publications

References 46 publications

Rational Synthesis of S-Scheme CdS/SnS2 Photocatalysts with Isolated Redox Cocatalysts for Enhanced H2 Production

Rational Synthesis of S-Scheme CdS/SnS2 Photocatalysts with Isolated Redox Cocatalysts for Enhanced H2 Production

In situ integration of a cocatalyst and heterojunction to a WO3 photoanode with enhanced photoelectrochemical performance via phosphatization

Enhanced Charge Separation and Transfer by BiVO4 Heterojunction and N-Doped for TiO2 Nanotubes during Photoelectrochemical Water Splitting

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A highly enhanced photoelectrochemical performance of BiVO₄ photoanodes modified with CoPi groups by increasing energy band bending, accelerating hole separation and improving water oxidation kinetics

Rational Synthesis of S-Scheme CdS/SnS₂ Photocatalysts with Isolated Redox Cocatalysts for Enhanced H₂ Production

Rational Synthesis of S-Scheme CdS/SnS₂ Photocatalysts with Isolated Redox Cocatalysts for Enhanced H₂ Production

In situ integration of a cocatalyst and heterojunction to a WO₃ photoanode with enhanced photoelectrochemical performance via phosphatization

Enhanced Charge Separation and Transfer by BiVO₄ Heterojunction and N-Doped for TiO₂ Nanotubes during Photoelectrochemical Water Splitting