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Catalysts
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Catalytic Properties of Hybrid Catalysts
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Catalytic Properties of Hybrid Catalysts

A special issue of Catalysts (ISSN 2073-4344). This special issue belongs to the section "Catalytic Materials".

Deadline for manuscript submissions: closed (15 January 2025) | Viewed by 2227

Special Issue Editors

Dr. Jana Pisk

E-Mail Website1 Website2
Guest Editor
Department of Chemistry, Faculty of Science, University of Zagreb, Zagreb, Croatia
Interests: coordination chemistry; advanced (bio)materials, polyoxometalates; molecular and supported catalysts; homogenous catalysis; heterogeneous catalysis; (ep)oxidations
Special Issues, Collections and Topics in MDPI journals
Dr. Dominique Agustin

E-Mail Website
Guest Editor
1. LCC Laboratoire de Chimie de Coordination, Toulouse, France
2. Department of Chemistry, IUT Paul Sabatier, Castres, France
Interests: coordination chemistry; green chemistry; catalysis; catalysts grafting; DFT calculations; organic solvent-free processes; polyoxometalates; biomass valorization
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Hybrid catalysts, which integrate the advantages of different catalytic components, have emerged as a versatile and powerful class of materials in the field of catalysis. These catalysts typically combine organic and inorganic constituents, enzymes and synthetic catalysts, or different types of inorganic materials, thereby achieving a synergistic enhancement in catalytic performance. The unique properties of hybrid catalysts arise from the interplay between their distinct components, leading to improved activity, selectivity, and stability in various chemical reactions.

The Special Issue explores the catalytic properties of hybrid catalysts, focusing on their design, synthesis, and application across different domains such as environmental remediation, energy conversion, and chemical production. The integration of multiple catalytic functions within a single framework enables precise control over reaction pathways and enhances the efficiency of complex catalytic processes. Advances in characterization techniques and theoretical modeling have furthered the understanding of the structure-activity relationships in hybrid catalysts, paving the way for the rational design of next-generation catalytic systems. This multidisciplinary approach holds great promise for addressing contemporary challenges in catalysis and for developing sustainable and efficient catalytic processes.

Dr. Jana Pisk
Dr. Dominique Agustin
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Catalysts is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2200 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • hybrid catalysts
  • catalytic processes
  • characterization techniques
  • theoretical modeling

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Published Papers (3 papers)

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Research

18 pages, 5908 KiB  
Article
Microemulsion-Based Synthesis of Highly Efficient Ag-Doped Fibrous SiO2-TiO2 Photoanodes for Photoelectrochemical Water Splitting
by Samia Arain, Muhammad Usman, Faiq Saeed, Shouzhong Feng, Waheed Rehman, Xianhua Liu and Haitao Dai
Catalysts 2025, 15(1), 66; https://doi.org/10.3390/catal15010066 - 13 Jan 2025
Viewed by 474
Abstract
Fibrous SiO2-TiO2 (FST) is one of the most promising materials for advancing photoelectrochemical water-splitting technology due to its cost-effectiveness and environmental friendliness. However, FST faces intrinsic limitations, including its low conductivity and wide bandgap. In this study, significant progress was [...] Read more.
Fibrous SiO2-TiO2 (FST) is one of the most promising materials for advancing photoelectrochemical water-splitting technology due to its cost-effectiveness and environmental friendliness. However, FST faces intrinsic limitations, including its low conductivity and wide bandgap. In this study, significant progress was made in modifying FST to overcome some of these limitations. This work involved synthesizing a new photoanode made of Ag-doped FST utilizing the microemulsion process. The Ag-doped FST was characterized using XRD, FTIR, UV–Vis, DRS, N2 adsorption–desorption, FESEM, TEM, and XPS. The results confirmed the formation of a continuous concentric lamellar structure with a large surface area. The addition of Ag species into the FST matrix caused interactions that reduced the bandgap. The Ag-doped FST photoanode exhibited an impressive photocurrent density of 13.98 mA/cm2 at 1.2 V (vs. RHE). This photocurrent density was notably higher than that of FST photoanodes, which was 11.65 mA/cm2 at 1.2 V (vs. RHE). Furthermore, the conduction band of Ag-doped FST is positioned closer to the reduction potential of hydrogen compared to that of FST, SiO2, and TiO2, facilitating rapid charge transfer and enabling the spontaneous generation of H2. The fabrication of Ag-doped FST provides valuable insights into the development of high-performance photoanodes for PEC water splitting. Full article
(This article belongs to the Special Issue Catalytic Properties of Hybrid Catalysts)
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10 pages, 1708 KiB  
Communication
N Simultaneously Doped TiO2@Carbon Hollow Spheres with Enhanced Photocatalytic CO2 Reduction Activity
by Weiwei Fu, Ziyun Wang, Xinjie Liu and Tianjiao Li
Catalysts 2025, 15(1), 39; https://doi.org/10.3390/catal15010039 - 4 Jan 2025
Viewed by 599
Abstract
Converting carbon dioxide (CO2) into solar fuels through photocatalysis represents an appealing approach to tackling the escalating energy crisis and mitigating the greenhouse effect. In this study, using melamine–formaldehyde (MF) nanospheres as a nitrogen source, a N element was simultaneously doped [...] Read more.
Converting carbon dioxide (CO2) into solar fuels through photocatalysis represents an appealing approach to tackling the escalating energy crisis and mitigating the greenhouse effect. In this study, using melamine–formaldehyde (MF) nanospheres as a nitrogen source, a N element was simultaneously doped into the TiO2 nanoparticle structure supported by carbon hollow spheres using a one-step carbonization method to form a heterojunction N-CHS@N-TiO2 (marked as (N-(CHS@TiO2)). The composite showed superior photocatalytic activity in reducing CO2 compared with TiO2 and N-CHS: after 6 h of visible light irradiation, the CO yield was 4.3 times that of N-CHS and TiO2; 6 h of UV irradiation later, the CO yield reached 2.6 times that of TiO2 and 7 times that of N-CHS. The substantial enhancement in photocatalytic activity was attributed to the nitrogen simultaneously doped carbon hollow spheres and TiO2, mesoporous structure, small average TiO2 crystal size, large surface areas, and the heterostructure formed by N-CHS and N-TiO2. The UV-vis diffuse reflectance spectra (DRS) exhibit a significant improvement in light absorption, attributed to the visible-light-active carbon hollow sphere and the N element doping, thereby enhancing solar energy utilization. Full article
(This article belongs to the Special Issue Catalytic Properties of Hybrid Catalysts)
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22 pages, 7192 KiB  
Article
Boosted Photoelectrochemical Water Oxidation Performance with a Quaternary Heterostructure: CoFe2O4/MWCNT-Doped MIL-100(Fe)/TiO2
by Waheed Rehman, Faiq Saeed, Yong Zhao, Bushra Maryam, Samia Arain, Muhammad Ayaz, Asad Jamil and Xianhua Liu
Catalysts 2024, 14(12), 901; https://doi.org/10.3390/catal14120901 - 9 Dec 2024
Viewed by 805
Abstract
Cobalt ferrite (CoFe2O4) combined with multi-walled carbon nanotubes (MWCNTs) is an outstanding material regarding photoelectrochemical water oxidation (PEC-WO) because of its excellent catalytic properties and stability. On the other hand, surface imperfections in CoFe2O4 can cause [...] Read more.
Cobalt ferrite (CoFe2O4) combined with multi-walled carbon nanotubes (MWCNTs) is an outstanding material regarding photoelectrochemical water oxidation (PEC-WO) because of its excellent catalytic properties and stability. On the other hand, surface imperfections in CoFe2O4 can cause band bending and surface Fermi level pinning, significantly reducing its PEC conversion efficiency. Heterostructure engineering is essential for achieving increased light-gathering capacity and charge separation efficiency for PEC-WO. In this study, a quaternary heterostructure of CoFe2O4/MWCNT-doped Metal–Organic Framework-100 (Iron), MIL-100(Fe)/Titanium Oxide (TiO2) was synthesized by using a combination of hydrothermal, solvothermal, and “dip and dry” techniques. Characterization results confirmed the formation of a structural network of MIL-100(Fe) on TiO2 surfaces, enhanced by the incorporation of MWCNTs during the hydrothermal reaction. Under 1 sun irradiation, the resultant quaternary heterostructure displayed a photocurrent density (Jph) of 3.70 mA cm−2 under free bias voltage, which is around 3.08 times more than that of pristine TiO2 photoanodes (Jph = 1.20 mA cm−2). This investigation highlights the advantages of the MIL-100(Fe) network in improving the solar PEC-WO performance of TiO2 photoanodes. Full article
(This article belongs to the Special Issue Catalytic Properties of Hybrid Catalysts)
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