Samarium and nitrogen co-doped Bi2 WO6 nanosheets were successfully synthesized by using a hydrothermal method. The crystal structures, morphology, elemental compositions, and optical properties of the prepared samples were investigated. The incorporation of samarium and nitrogen ions into Bi2 WO6 was proved by X-ray diffraction, energy dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. UV/Vis diffuse reflectance spectroscopy indicated that the samarium and nitrogen co-doped Bi2 WO6 possessed strong visible-light absorption. Remarkably, the samarium and nitrogen co-doped Bi2 WO6 exhibited higher photocatalytic activity than single-doped and pure Bi2 WO6 under visible-light irradiation. Radical trapping experiments indicated that holes (h(+) ) and superoxide radicals ((.) O2 (-) ) were the main active species. The results of photoluminescence spectroscopy and photocurrent measurements demonstrated that the recombination rate of the photogenerated electrons and holes pairs was greatly depressed. The enhanced activity was attributed to the synergistic effect of the in-built Sm(3+) /Sm(2+) redox pair centers and the N-doped level. The mechanism of the excellent photocatalytic activity of Sm-N-Bi2 WO6 is also discussed.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/chem.201602168 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Enabling N to Ammonia Conversion in Bi WO -Based Materials: A New Avenue in Photocatalytic Applications.
Chemistry
December 2023
Department of Materials Science and Engineering, National Dong Hwa University, Hualien, 97401, Taiwan.
The field of photocatalysis has been evolving since 1972 since Honda and Fujishima's initial push for using light as an energy source to accomplish redox reactions. Since then, many photocatalysts have been studied, semiconductors or otherwise. A new photocatalytic application to convert N gas to ammonia (N fixation or nitrogen reduction reaction; NRR) has emerged.
View Article and Find Full Text PDFExploring a Ni-N Active Site-Based Conjugated Microporous Polymer Z-Scheme Heterojunction Through Covalent Bonding for Visible Light-Driven Photocatalytic CO Conversion in Pure Water.
Small
February 2024
School of Chemistry and Chemical Engineering, University of Jinan, Jinan, 250022, China.
Designing photocatalysts with efficient charge transport and abundant active sites for photocatalytic CO reduction in pure water is considered a potential approach. Herein, a nickel-phthalocyanine containing Ni-N active sites-based conjugated microporous polymer (NiPc-CMP), offering highly dispersed metal active sites, satisfactory CO adsorption capability, and excellent light harvesting properties, is engineered as a photocatalyst. By virtue of the covalently bonded bridge, an atomic-scale interface between the NiPc-CMP/Bi WO Z-scheme heterojunction with strong chemical interactions is obtained.
View Article and Find Full Text PDFCoupling Benzylamine Oxidation with CO Photoconversion to Ethanol over a Black Phosphorus and Bismuth Tungstate S-Scheme Heterojunction.
Angew Chem Int Ed Engl
September 2023
State Key Laboratory of Crystal Materials, Institute of Crystal Materials, Shandong University, Jinan, 250100, China.
Photoconversion of CO and H O into ethanol is an ideal strategy to achieve carbon neutrality. However, the production of ethanol with high activity and selectivity is challenging owing to the less efficient reduction half-reaction involving multi-step proton-coupled electron transfer (PCET), a slow C-C coupling process, and sluggish water oxidation half-reaction. Herein, a two-dimensional/two-dimensional (2D/2D) S-scheme heterojunction consisting of black phosphorus and Bi WO (BP/BWO) was constructed for photocatalytic CO reduction coupling with benzylamine (BA) oxidation.
View Article and Find Full Text PDFGradient Cationic Vacancies Enabling Inner-To-Outer Tandem Homojunctions: Strong Local Internal Electric Field and Reformed Basic Sites Boosting CO Photoreduction.
Adv Mater
August 2023
Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing, 100083, China.
The slow charge dynamics and large activation energy of CO severely hinder the efficiency of CO photoreduction. Defect engineering is a well-established strategy, while the function of common zero-dimensional defects is always restricted to promoting surface adsorption. In this work, a gradient layer of tungsten vacancies with a thickness of 3-4 nm is created across Bi WO nanosheets.
View Article and Find Full Text PDFCharge Modulation at Atomic-Level through Substitutional Sulfur Doping into Atomically Thin Bi WO toward Promoting Photocatalytic CO Reduction.
ChemSusChem
July 2022
Multidisciplinary Platform of Advanced Engineering, Chemical Engineering Discipline, School of Engineering, Monash University Malaysia, Jalan Lagoon Selatan, Bandar Sunway, 47500, Selangor, Malaysia.
Photocatalytic reduction of CO has attracted enormous interest as a sustainable and renewable source of energy. In the past decade, numerous bulk-type semiconductors have been developed, but the existing designs suffer many limitations, namely rapid recombination of charge carriers and weak light absorption ability. Herein, a bottom-up approach was developed to design atomically thin sulfur-doped Bi WO perovskite nanosheets (S-BWO) with improved reduction ability, extended visible light absorption, prolonged lifetime of charge carriers, enhanced adsorption of CO , and reduced work function.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!