Novel preparation strategy of graphdiyne (CnH2n-2): One-pot conjugation and S-Scheme heterojunctions formed with MoP characterized with in situ XPS for efficiently photocatalytic hydrogen evolution

Applied Catalysis B Environment and Energy, Journal Year: 2023, Volume and Issue: 327, P. 122461 - 122461

Published: Feb. 13, 2023

Language: Английский

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In Situ Formation ZnIn₂S₄/Mo₂TiC₂ Schottky Junction for Accelerating Photocatalytic Hydrogen Evolution Kinetics: Manipulation of Local Coordination and Electronic Structure

Small, Journal Year: 2023, Volume and Issue: 19(24)

Published: March 15, 2023

Regulating electronic structures of the active site by manipulating local coordination is one advantageous means to improve photocatalytic hydrogen evolution (PHE) kinetics. Herein, ZnIn2 S4 /Mo2 TiC2 Schottky junctions are designed be constructed through interfacial In3+ with electronegative O terminal group on Mo2 based different work functions. Kelvin probe force microscopy and charge density difference reveal that an unidirectional transport channel across interface from established formed nucleophilic/electrophilic region. The increased electron inhibits backflow electrons, boosts transfer separation, optimizes adsorption energy. Therefore, photocatalyst exhibits a superior PHE rate 3.12 mmol g-1 h-1 under visible light, reaching 3.03 times pristine . This provides some insights inspiration for preparing MXene-based catalysts accelerate

Language: Английский

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Revealing the Selective Bifunctional Electrocatalytic Sites via In Situ Irradiated X‐Ray Photoelectron Spectroscopy for Lithium–Sulfur Battery

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

Published: Jan. 16, 2023

The electrocatalysts are widely applied in lithium-sulfur (Li-S) batteries to selectively accelerate the redox kinetics behavior of Li2 S, which bifunctional active sites established, thereby improving electrochemical performance battery. Considering that Li-S battery is a complex closed "black box" system, internal reaction routes and cannot be directly observed monitored especially due distribution potential active-site structures their dynamic reconstruction. Empirical evidence demonstrates traditional test methods theoretical calculations only probe net result multi-factors on an average whole scale. Herein, based amorphous TiO2-x @Ni selective model catalyst, these limitations overcome by developing system couples light field situ irradiated X-ray photoelectron spectroscopy synergistically convert into "see-through" for direct observation charge transportation, thus revealing Ni nanoparticle as oxidation reduction promote decomposition nucleation respectively. This work provides universal method achieve deeper mechanistic understanding bidirectional sulfur electrochemistry.

Language: Английский

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Understanding the unique Ohmic-junction for enhancing the photocatalytic activity of CoS2/MgIn2S4 towards hydrogen production

Applied Catalysis B Environment and Energy, Journal Year: 2024, Volume and Issue: 351, P. 123950 - 123950

Published: April 24, 2024

Language: Английский

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Interface engineering of Mn3O4/Co3O4 S-scheme heterojunctions to enhance the photothermal catalytic degradation of toluene

Journal of Hazardous Materials, Journal Year: 2023, Volume and Issue: 452, P. 131249 - 131249

Published: March 22, 2023

Language: Английский

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Optimizing hydrogen production by alkaline water decomposition with transition metal-based electrocatalysts

Environmental Chemistry Letters, Journal Year: 2023, Volume and Issue: 21(5), P. 2583 - 2617

Published: June 3, 2023

Abstract Burning fossil fuels account for over 75% of global greenhouse gas emissions and 90% carbon dioxide emissions, calling alternative such as hydrogen. Since the hydrogen demand could reach 120 million tons in 2024, efficient large-scale production methods are required. Here we review electrocatalytic water splitting with a focus on reaction mechanisms, transition metal catalysts, optimization strategies. We discuss mechanisms decomposition evolution. Transition catalysts include alloys, sulfides, carbides, nitrides, phosphides, selenides, oxides, hydroxides, metal-organic frameworks. The can be optimized by modifying nanostructure or electronic structure. observe that metal-based electrocatalysts excellent due to their abundant sources, low cost, controllable structures. Concerning optimization, fluorine anion doping at 1 mol/L potassium hydroxide yields an overpotential 38 mV current density 10 mA/cm 2 . efficiency also enhanced adding atoms nickel sulfide framework.

Language: Английский

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Defect-Induced Synergetic Effect of Bi-Based Compounds for One-Pot Conversion of Organic Pollutants into CO via Coupling Photodegradation of Carbamazepine with Photoreduction of CO₂

ACS Catalysis, Journal Year: 2024, Volume and Issue: 14(4), P. 2134 - 2143

Published: Jan. 25, 2024

The waste of carbon sources and greenhouse gas production during wastewater treatment have become extremely important environmental issues. Herein, the BiOBr/BiVO4 compounds with defect-induced frustrated Lewis acid–base pairs (DFLPs) internal charge transfer were fabricated to convert organic pollutants into CO nearly 100% selectivity. oxygen vacancy (Ov) induced built-in electric field in create directional from BiOBr BiVO4. Density functional theory (DFT) calculations prove that Ov combines its adjacent hydroxyls form DFLP active sites can additionally capture activate CO2. Meanwhile, reduce formation-free energy COOH* intermediates, which is key rate-limiting step CO2 high This system has achieved selective conversion value-added chemicals pollutant degradation provides a theoretical basis for actual recycling sources.

Language: Английский

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Construction of unique floating Bi2WO6/g-C3N4 S-scheme heterojunction to promote photocatalytic activity

Journal of environmental chemical engineering, Journal Year: 2024, Volume and Issue: 12(3), P. 112939 - 112939

Published: April 30, 2024

Language: Английский

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Rational Design of Three Dimensional Hollow Heterojunctions for Efficient Photocatalytic Hydrogen Evolution Applications

Advanced Science, Journal Year: 2024, Volume and Issue: 11(13)

Published: Jan. 23, 2024

Abstract The efficiency of photocatalytic hydrogen evolution is currently limited by poor light adsorption, rapid recombination photogenerated carriers, and ineffective surface reaction rate. Although heterojunctions with innovative morphologies structures can strengthen built‐in electric fields maximize the separation charges. However, how to rational design novel multidimensional simultaneously improve above three bottleneck problems still a research imperative. Herein, unique Cu 2 O─S@graphene oxide (GO)@Zn 0.67 Cd 0.33 S Three dimensional (3D) hollow heterostructure designed synthesized, which greatly extends carrier lifetime effectively promotes H production rate reached 48.5 mmol g −1 h under visible after loading Ni 2+ on heterojunction surface, 97 times higher than that pure Zn nanospheres. Furthermore, reach 77.3 without cooling, verifying effectiveness photothermal effect. Meanwhile, in situ characterization density flooding theory calculations reveal efficient charge transfer at p‐n 3D interface. This study not only reveals detailed mechanism depth but also rationalizes construction superior heterojunctions, thus providing universal strategy for materials‐by‐design high‐performance heterojunctions.

Language: Английский

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Revealing electron numbers-binding energy relationships in heterojunctions via in-situ irradiated XPS

Applied Catalysis B Environment and Energy, Journal Year: 2024, Volume and Issue: 356, P. 124223 - 124223

Published: May 22, 2024

Language: Английский

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