Related Experiment Video
Updated: May 15, 2025
10:21
Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
Published on: October 5, 2019
8.3K
Utilizing Photothermal Effect Enhances Photocatalytic Water Splitting Coupled with Selective Benzyl Alcohol Oxidation
Bojing Sun1,2,3, Mengjia Ye1, Yachao Xu4
1College of Materials and Chemical Engineering, Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, China Three Gorges University, Yichang, Hubei, 443002, P. R. China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|April 11, 2025
Summary
Defective ZnIn2S4 nanosheets decorated with WC quantum dots (DZIS/WCQDs) offer efficient solar-driven hydrogen production and benzyl alcohol oxidation. This dual-functional photocatalyst overcomes low carrier utilization and resource consumption issues without sacrificial agents.
Area of Science:
- Materials Science
- Photocatalysis
- Renewable Energy
Background:
- Solar-driven photocatalytic water splitting faces challenges like low photogenerated hole utilization and sacrificial agent dependency.
- Efficient hydrogen production requires advanced photocatalysts that can overcome these limitations.
Purpose of the Study:
- To fabricate a dual-functional photocatalyst for enhanced solar-driven water splitting and selective benzyl alcohol oxidation.
- To investigate the synergistic effects of Schottky junctions and photothermal properties on photocatalytic performance.
Main Methods:
- Synthesis of WC quantum dots decorated defective ZnIn2S4 nanosheets (DZIS/WCQDs).
- Characterization of photocatalyst structure and properties.
- Evaluation of photocatalytic activity for hydrogen evolution and benzyl alcohol oxidation.
Main Results:
- DZIS/WCQDs composites demonstrated efficient separation and transport of photogenerated carriers due to unique Schottky junctions and photothermal effects.
- Achieved high conversion rate (85.34%) and selectivity (96.53%) for benzaldehyde production.
- Exhibited outstanding H2 and benzaldehyde evolution rates of 12.58 and 10.53 mmol g-1 h-1, respectively, without sacrificial agents or co-catalysts.
Conclusions:
- The DZIS/WCQDs photocatalyst offers a green, carbon-free pathway for efficient hydrogen production and selective organic oxidation.
- The developed material represents a significant advancement in addressing the efficiency and cost issues in photocatalytic hydrogen generation.
Keywords:
Schottky junctionsdefective ZnIn2S4photocatalytic BA oxidationphotocatalytic water splittingphotothermal effectMore Related Videos
Related Concept Videos
02:44Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
9.7K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
9.7K
01:28Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation
4.2K
Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
4.2K
00:59Reactions at the Benzylic Position: Oxidation and Reduction
3.3K
The benzylic position describes the position of a carbon atom attached directly to a benzene ring. Benzene by itself does not undergo oxidation. In contrast, the benzylic carbon is quite reactive in the presence of strong oxidizing agents such as KMnO4 or H2CrO4. Therefore, alkylbenzenes are readily oxidized to benzoic acid, irrespective of the type of alkyl groups.
3.3K
01:10Hydrolysis of Chlorobenzene to Phenol: Dow Process
2.5K
Simple aryl halides do not react with nucleophiles under normal conditions. However, the reaction can proceed under drastic conditions involving high temperatures and high pressure to give the substituted products. For example, chlorobenzene is converted to phenol using aqueous sodium hydroxide at 350 °C under high pressure by the Dow process. The reaction follows an elimination-addition mechanism involving a benzyne intermediate. Here, the chloride ion is...
2.5K
01:26Photochemical Electrocyclic Reactions: Stereochemistry
1.8K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
1.8K
02:15Preparation of Alcohols via Addition Reactions
6.1K
Overview
The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
6.1K