Modulating built-in electric field via Bi-VO4-Fe interfacial bridges to enhance charge separation for efficient photoelectrochemical water splitting

Journal of Colloid and Interface Science, Journal Year: 2024, Volume and Issue: 672, P. 12 - 20

Published: May 31, 2024

Language: Английский

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Enhanced bulk and interfacial charge transfer in Fe:VOPO4 modified Mo:BiVO4 photoanodes for photoelectrochemical water splitting

eScience, Journal Year: 2024, Volume and Issue: unknown, P. 100242 - 100242

Published: Jan. 1, 2024

Bismuth vanadate (BiVO4) is a promising photoanode material for photoelectrochemical (PEC) water oxidation. However, its performance greatly hindered by poor bulk and interfacial charge transfer. Herein, to address this issue, iron doped vanadyl phosphate (Fe:VOPO4) was grafted on molybdenum BiVO4 (Mo:BiVO4) significantly enhancing transfer oxygen evolution kinetics simultaneously. Consequently, the resultant Fe:VOPO4/Mo:BVO4 exhibits remarkable photocurrent density of 6.59 mA cm−2 at 1.23 V versus reversible hydrogen electrode (VRHE) under AM 1.5G illumination, over approximately 5.5 times as high that pristine BiVO4. Systematic studies have demonstrated hopping activation energy small polarons reduced due Mo doping, resulting in accelerated More importantly, deposition Fe:VOPO4 promotes between Mo:BiVO4 via construction V−O−V P−O bonds, addition facilitating splitting kinetics. This work provides general strategy optimizing process, especially interface photoanodes cocatalysts.

Language: Английский

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Converting Undesirable Defects into Activity Sites Enhances the Photoelectrochemical Performance of The ZnIn₂S₄ Photoanode

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(18)

Published: Jan. 31, 2024

Abstract Heteroatom doping can tune the band structure of semiconductors and enhance their carrier transfer capacity for improving performance photoelectrochemical water oxidation. Nevertheless, introduction dopants is not always beneficial. In this study, magnesium (Mg) adopted to dope ZnIn 2 S 4 nanosheet array photoanodes form a type‐II reduce bulk recombination, but concurrently introduced deleterious oxygen (O) defects slow down surface catalytic reaction kinetics. Furthermore, facile heat treatment strategy proposed transform these O into Mg─O bonds. First‐principles calculations electrochemical characterization indicate that presence bonds provides abundant active sites efficiently accelerates evolution by precisely realigning rate‐determining step from OH* O* (step 2) OOH* 4), thereby retarding charge trapping recombination. As result, such photoanode achieves remarkable with photocurrent as high 4.91 mA cm −2 at 1.23 V versus reversible hydrogen electrode, onset potential shifts negatively about 340 mV. This work new defect modulation idea converting detrimental favorable ones, it be expected have wide applications in fields energy, catalysis, optoelectronics, etc.

Language: Английский

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Porphyrins‐Assisted Cocatalyst Engineering with CoOV Bond in BiVO₄ Photoanode for Efficient Oxygen Evolution Reaction

Advanced Science, Journal Year: 2023, Volume and Issue: 10(8)

Published: Jan. 16, 2023

Abstract The application of photoelectrochemical (PEC) water splitting is limited by the sluggish surface oxygen evolution reaction (OER) kinetics. OER kinetics can be effectively improved through cocatalyst engineering. However, tardy transfer process and serious recombination carriers are key factors restricting development. Taking BiVO 4 as an example, a Co‐modified heme film rich in large conjugated ring structures introduced onto photoanode using solvothermal method. This functions efficient cocatalyst. It considerably reduces overpotential, promotes photogenerated holes, boosts specifically affecting formation OOH*. Simultaneously, formed CoOV bonds induce strong interaction at photoanode/cocatalyst interfaces, reducing carriers. Consequently, onset potential optimized decreases from 0.45 to 0.07 V photocurrent density 1.23 versus reversible hydrogen electrode 5.3 mA cm −2 . work demonstrates facile strategy for designing cocatalysts obtain rapid hole capability reduced carrier PEC performance.

Language: Английский

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The Positive Versus Negative Effects of Defect Engineering for Solar Water Splitting: A Review

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(47)

Published: Sept. 3, 2023

Abstract Although defect design is an essential means of improving the performance photocatalytic materials, introduction not always beneficial. Current engineering focuses on avoiding or modifying introduced defects to mitigate their adverse effects solar water splitting performance. This review comprehensively summarizes strategies for and discusses crucial roles in splitting. Focusing dual defects, most basic schemes preparing favorable through pretreatment posttreatment methods are reviewed. In addition, overcoming mitigating detrimental improve photocatalysts. Finally, challenges prospects developing a defect‐based photocatalyst strategy outlined. provides reference photocatalysts conducting more in‐depth research defects. Additionally, it offers ideas utilizing unfavorable converting them into improvement.

Language: Английский

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Cocatalysts‐Photoanode Interface in Photoelectrochemical Water Splitting: Understanding and Insights

Small, Journal Year: 2023, Volume and Issue: 20(1)

Published: Aug. 31, 2023

Abstract Sluggish oxygen evolution reactions on photoanode surfaces severely limit the application of photoelectrochemical (PEC) water splitting. The loading cocatalysts photoanodes has been recognized as simplest and most efficient optimization scheme, which can reduce surface barrier, provide more active sites, accelerate catalytic reaction kinetics. Nevertheless, introduction inevitably generates interfaces between (Ph/OEC), causes severe interfacial recombination hinders carrier transfer. Recently, many researchers have focused cocatalyst engineering, while few investigated effect Ph/OEC interface. Hence, to maximize advantages cocatalysts, problems for designing are systematically introduced. In this review, interrelationship PEC performance is classified some methods characterizing investigated. Additionally, common strategies summarized. This review details cocatalyst‐design‐based problems, provides ideas offers references solving problems.

Language: Английский

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Exploring progress in binary and ternary nanocomposites for photoelectrochemical water splitting: A comprehensive review

Coordination Chemistry Reviews, Journal Year: 2024, Volume and Issue: 522, P. 216180 - 216180

Published: Sept. 6, 2024

Language: Английский

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NiFe MOF modified BiVO4 photoanode with strong π-π conjugation enhances built-in electric field for boasting photoelectrochemical water oxidation

Journal of Colloid and Interface Science, Journal Year: 2023, Volume and Issue: 654, P. 1492 - 1503

Published: Oct. 30, 2023

Language: Английский

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Precise Lattice‐Strain Modulation of Hematite Enabled by Gradient Doping of Mn for Enhanced Photoelectrocatalytic Oxidative C─C Bond Scission

Small Structures, Journal Year: 2024, Volume and Issue: 5(6)

Published: Feb. 5, 2024

The high‐value utilization of biomass feedstock is fascinating but limited by efficient C─H activation to break C─C bonds. Herein, F‐Fe 2 O 3 ‐Mn photoanodes with modulable compressive strain are fabricated gradient infusion Mn into F‐doped hematite (F‐Fe ), which illustrated be highly for oxidative bond cleavage various bio‐based 1,2‐diols produce benzoic acids or aromatic ketones (94.5–97.2% yields) in photoelectrocatalytic (PEC) device, coupling a high H production 1180 μmol cm −2 (≈96% yield). doping species the photoelectrode bulk results improved photoexcited carriers separation and transfer efficiency (3.41 mA ). On other hand, lattice distortion induced also leads effect on F─Fe ─Mn, can precisely modulate electronic structure. Control experiments, situ characterization, theoretical calculations elaborate that capable adjusting position d ‐band center facilitate activation, remarkably enabling PEC breaking 1,2‐diol desorption oxidized product. This “one‐stone‐two‐bird” strategy presents straightforward protocol efficiently bonds organic transformations via oxidation.

Language: Английский

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Nitrogen-Rich Conjugated Microporous Polymers with Improved Cobalt(II) Density for Highly Efficient Electrocatalytic Oxygen Evolution

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(7), P. 8903 - 8912

Published: Feb. 7, 2024

Developing efficient oxygen evolution catalysts (OECs) made from earth-abundant elements is extremely important since the reaction (OER) with sluggish kinetics hinders development of many energy-related electrochemical devices. Herein, an strategy developed to prepare conjugated microporous polymers (CMPs) abundant and uniform coordination sites by coupling N-rich organic monomer 2,4,6-tris(5-bromopyrimidin-2-yl)-1,3,5-triazine (TBPT) Co(II) porphyrin. The resulting CMP-Py(Co) further metallized Co2+ ions obtain CMP-Py(Co)@Co. Structural characterization results reveal that CMP-Py(Co)@Co has higher content (12.20 wt %) affinity toward water compared CMP-Py(Co). Moreover, exhibits excellent OER activity a low overpotential 285 mV vs RHE at 10 mA cm–2 Tafel slope 80.1 dec–1, which are significantly lower than those (335 96.8 dec–1). More interestingly, outperforms most reported porous polymer-based OECs benchmark RuO2 catalyst (320 87.6 Additionally, Co2+-free CMP-Py(2H) negligible activity. Thereby, enhanced attributed incorporation leading rich active enlarged surface areas. Density functional theory (DFT) calculations Co2+-TBPT have Co2+-porphyrin for OER. These indicate introduction metal in stable conductive CMPs could provide novel guidance designing OECs.

Language: Английский

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