Effective photocatalytic hydrogen evolution by Ti3C2-modified CdS synergized with N-doped C-coated Cu2O in S-scheme heterojunctions

Huang, Kaihui; Feng, Boning; Wen, Xinghua; Hao, Lei; Xu, Difa; Liang, Guijie; Shen, Rongchen; Li, Xin

doi:10.1016/j.cjsc.2023.100204

Cited by 12 publications

(2 citation statements)

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“…In particular, the simultaneous addition of redox cocatalysts can indeed enhance the photo reduction and oxidation reactions by the coherent consumption of electrons and holes, respectively. Depending on the relative band positions, various combinations of CdS are reported in the literature with different charge transfer mechanisms including S-scheme, Z-scheme, Type-II, etc. − However, in most cases, the redox cocatalyst was not employed or the cocatalyst employed was expensive noble metals, and their upscaling application is extremely restricted owing to their high price and rarity. Therefore, replacing the noble metals with naturally abundant, cheaply available materials to fabricate dual redox cocatalysts containing composite photocatalysts is extremely desirable.…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…Assembling two semiconductors to construct heterostructures is considered to be an efficient method to accelerate charge transfer. − The matched band positions and the formed interfacial built-in electric field endow the photoinduced electrons transfer from one semiconductor to the other, achieving the spatial separation of electrons and holes for respective reduction and oxidation half-reactions . Although a large number of heterostructures such as inorganic heterostructures, − inorganic–organic heterostructures, , and MOF-based heterostructures , have been widely investigated for photocatalysis, the poor structural compatibility and adjustability of them hinder their further exploration in photocatalytic water splitting. In contrast, the structural flexibility of COFs makes them promising candidates for constructing organic heterostructure photocatalysts with spatially separated redox sites for water splitting.…”

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confidence: 99%

Spatially Separated Photoredox in a Covalent Organic Frameworks Heterostructure Boosting Overall Water Splitting

Niu,

Chen,

Pan

et al. 2024

ACS Materials Lett.

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Covalent organic frameworks (COFs) with excellent structural tunability have emerged as fascinating photocatalysts to fulfill future energy demands. Here, we developed a COFs heterostructure by assembling two COFs for photocatalytic overall water splitting. The resulting heterostructure exhibited an effective spatial separation of photoredox sites originating from the efficient separation of photoinduced charge carriers through an orientated interfacial electron transfer pathway. Accordingly, the heterostructure of the COFs displays excellent activity for stoichiometric water splitting into H 2 and O 2 under 5 W white LED light irradiation. Our efficiencies of H 2 and O 2 evolution rates up to 120 and 58 μmol g −1 h −1 are significantly higher than those reported previously. The combination of experiments and theoretical calculations shows that water oxidation proceeds by a metal-free hydrationmediated pathway. This work sheds light on a rational design of the COF heterostructure with spatially separated photoredox for water splitting.

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Fluorenone‐Based Covalent Triazine Frameworks/Twinned Zn_0.5Cd_0.5S S‐scheme Heterojunction for Efficient Photocatalytic H₂ Evolution

Ding,

Shen,

Huang

et al. 2024

Adv Funct Materials

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Photocatalytic hydrogen evolution reaction (HER) is a very promising and sustainable technology, yet precisely exploring effective HER photocatalysts remains a critical challenge due to the rapid charge recombination. In this work, a brand‐new S‐scheme heterojunction is successfully designed and constructed by in situ growth of twinned Zn0.5Cd0.5S Solid Solution (CZS) on a novel fluorenone‐based covalent triazine framework (FOCTF). The S‐scheme heterojunctions is identified via in situ irradiation XPS, and electron spin resonance, which can greatly improve the photocatalytic HER rate and stability. Under illumination, the highest photocatalytic HER rate of well‐designed CZS‐FOCTF is 247.62 mmolg−1h−1, 3.83 times as high as that of pure CZS. Experimental and theoretical investigations corroborate that the new FOCTF has a well‐matched staggered band alignment and work function difference with CZS. The as‐fabricated CZS‐FOCTF S‐scheme heterojunction can establish a favorable internal electric field, which accelerates the directional S‐scheme charge migration, thereby enhancing the separation and utilization efficiency of carriers. This finding precisely achieves the spatially oriented powerful electron transport and separation at the interfaces of inorganic–organic hybrid heterojunctions. It is thus desirable that this work can furnish an alternative strategy to rationally design new CZS‐based S‐scheme heterojunction photocatalysts based on novel organic oxidation semiconductors for diversified photocatalytic reactions.

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Effective photocatalytic hydrogen evolution by Ti3C2-modified CdS synergized with N-doped C-coated Cu2O in S-scheme heterojunctions

Cited by 12 publications

References 41 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

Spatially Separated Photoredox in a Covalent Organic Frameworks Heterostructure Boosting Overall Water Splitting

Fluorenone‐Based Covalent Triazine Frameworks/Twinned Zn_0.5Cd_0.5S S‐scheme Heterojunction for Efficient Photocatalytic H₂ Evolution

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Effective photocatalytic hydrogen evolution by Ti3C2-modified CdS synergized with N-doped C-coated Cu2O in S-scheme heterojunctions

Cited by 12 publications

References 41 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

Spatially Separated Photoredox in a Covalent Organic Frameworks Heterostructure Boosting Overall Water Splitting

Fluorenone‐Based Covalent Triazine Frameworks/Twinned Zn0.5Cd0.5S S‐scheme Heterojunction for Efficient Photocatalytic H2 Evolution

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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

Fluorenone‐Based Covalent Triazine Frameworks/Twinned Zn_0.5Cd_0.5S S‐scheme Heterojunction for Efficient Photocatalytic H₂ Evolution