New Advances in Perovskite and Metal Oxide Photocatalysts and Electrocatalysts

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

Deadline for manuscript submissions: closed (30 April 2024) | Viewed by 3860

Special Issue Editors

Faculty of Chemistry and Biochemistry, Ruhr University Bochum, 44801 Bochum, Germany
Interests: electrocatalysis; functional materials development; water electrolysis; surface characterization; single particle electrochemistry; nano-sensors
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Guest Editor
Department of Chemistry and Earth Sciences, College of Arts and Sciences, Qatar University, 2713 Doha, Qatar
Interests: nanomaterials; perovskite solar cells; functional semiconductors; nanophotonics; automated labs
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Guest Editor
Department of Pharmaceutical Chemistry and Pharmacognosy, College of Pharmacy, Jazan University, Jazan, Saudi Arabia
Interests: electrochemistry; electrophoresis; biosensors; biomolecule-metal ion interaction characterization; electro-nanometal deposition for biosensors; immuno-assay

Special Issue Information

Dear Colleagues,

Metal oxides, particularly perovskite oxides with a general formula ABO3, represent the nexus of sustainable chemistry. These materials have attracted enormous interest as efficient catalysts and  have emerged as a low-cost alternative to platinum-group metals (PGMs) in various modern technological applications due to their versatile properties. In the field of electrocatalysis, perovskite and transition metal oxides have been investigated as catalysts for many reactions, including the oxygen evolution reaction (OER), the oxygen reduction reaction (ORR), hydrogen evolution (HER), and CO2 reduction. In addition, they showed efficient photocatalytic properties.

This Special Issue showcases the recent advances in the development of perovskites and metal oxides materials for electro- and/or photo-catalysis. This includes both experimental and theoretical approches to improve the overall performance of the catalytic reactions by optimizing the physico-chemical properties of reaction components (catalysts, electrolytes, and membranes), operating conditions, and reactor designs. We therefore welcome all original papers and reviews encompassing the above subject line for submission. If you have any questions, please contact the editor, Mr. Ives Liu (ives.liu@mdpi.com).

Dr. Hatem Amin
Dr. Yasser Hassan
Dr. Hassan A. Alhazmi
Guest Editors

Manuscript Submission Information

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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 2700 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

  • perovskite
  • nanoparticles
  • oxygen evolution
  • hydrogen reduction
  • CO2 reduction
  • photocatalysis
  • electrocatalysis
  • electrolyzers
  • fuel cells

Published Papers (3 papers)

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Research

16 pages, 2855 KiB  
Article
Plasmonic-Assisted Water–Gas Shift Reaction of Gold Particles on TiO2
by Ahmed Khaja Wahab, Kumudu Mudiyanselage and Hicham Idriss
Catalysts 2023, 13(11), 1444; https://doi.org/10.3390/catal13111444 - 15 Nov 2023
Viewed by 1001
Abstract
The Localized Surface Plasmon (LSP) effect of 5 nm mean size Au particles deposited on TiO2 P25 was investigated during the photo-thermal water gas shift reaction (WGSR). The effects of CO concentration, excitation light flux and energy, and molecular oxygen addition during [...] Read more.
The Localized Surface Plasmon (LSP) effect of 5 nm mean size Au particles deposited on TiO2 P25 was investigated during the photo-thermal water gas shift reaction (WGSR). The effects of CO concentration, excitation light flux and energy, and molecular oxygen addition during the reaction were investigated. The photocatalytic WGSR rate under light excitation with wavelengths extending from 320 to 1100 nm was found to be higher than the thermal reaction alone at the same temperature (85 °C). A H2/CO2 ratio of near unity was found at high concentrations of CO. The addition of molecular oxygen during the reaction resulted in a slight decrease in molecular hydrogen production, while the rates of CO2 formation and CO consumption changed by one order of magnitude. More importantly, it was found that the WGSR rates were still high under only visible light excitation (600–700 nm). The results prove that Au LSP alone triggers this chemical reaction without requiring the excitation of the semiconductor on which they are deposited. Full article
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16 pages, 4135 KiB  
Article
ZnO-Bi2O3 Heterostructured Composite for the Photocatalytic Degradation of Orange 16 Reactive Dye: Synergistic Effect of UV Irradiation and Hydrogen Peroxide
by Roeel Shahzad, Majid Muneer, Rimsha Khalid and Hatem M. A. Amin
Catalysts 2023, 13(10), 1328; https://doi.org/10.3390/catal13101328 - 28 Sep 2023
Cited by 3 | Viewed by 1097
Abstract
The development of semiconductor photocatalysts has recently witnessed notable momentum in the photocatalytic degradation of organic pollutants. ZnO is one of the most widely used photocatalysts; however, its activity is limited by the inefficient absorption of visible light and the fast electron–hole recombination. [...] Read more.
The development of semiconductor photocatalysts has recently witnessed notable momentum in the photocatalytic degradation of organic pollutants. ZnO is one of the most widely used photocatalysts; however, its activity is limited by the inefficient absorption of visible light and the fast electron–hole recombination. The incorporation of another metal or semiconductor with ZnO boosts its performance. In this present study, a heterostructured ZnO-Bi2O3 composite was synthesized via a simple co-precipitation method and was investigated for the UV-driven photocatalytic degradation of the Reactive Orange 16 (RO16), a model textile dye. The successful fabrication of ZnO-Bi2O3 microstructures with crystalline nature was characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and energy-dispersive X-ray (EDX). The discoloration of the dye solution was quantified using UV–Vis spectroscopy to determine the photocatalytic efficiency. The photocatalytic activity results demonstrated that the photodegradation at ZnO-Bi2O3 heterojunction was more efficient and 300 and 33% faster than individual Bi2O3 and ZnO catalysts, respectively, an effect that is indicative of a synergistic effect. In the presence of ZnO-Bi2O3 particles, the UV light-driven activity for RO16 degradation was twice as high as in its absence. The influence of adding the oxidant H2O2 on the UV-induced photocatalytic degradation was investigated and the results revealed a two-time increase in the photocatalytic activity of ZnO-Bi2O3 compared to UV irradiation alone, which could be ascribed to a summative degradative effect between UV and H2O2. Hence, this approach holds the potential for environmentally friendly wastewater treatment. Full article
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25 pages, 9721 KiB  
Article
Perovskite-Like Strontium Bismuth Oxyhalides: Synthesis, Characterisation, Photocatalytic Activity and Degradation Mechanism
by Yu-Yun Lin, Pei-Hsuan Lu, Fu-Yu Liu, Chung-Shin Lu and Chiing-Chang Chen
Catalysts 2023, 13(5), 812; https://doi.org/10.3390/catal13050812 - 27 Apr 2023
Cited by 7 | Viewed by 1376
Abstract
Recent studies have demonstrated that bismuth oxyhalides with a 2D structure inhibit the recombination of electron–hole pairs. Further, perovskite-like strontium bismuth-based compounds with a special layered Sillen X1 structure have shown potential for use as effective visible-light photocatalysts. Here, a series of strontium [...] Read more.
Recent studies have demonstrated that bismuth oxyhalides with a 2D structure inhibit the recombination of electron–hole pairs. Further, perovskite-like strontium bismuth-based compounds with a special layered Sillen X1 structure have shown potential for use as effective visible-light photocatalysts. Here, a series of strontium bismuth oxyhalide composites were prepared under different calcination conditions. The sample compositions were controlled by modulating the calcination temperature and the secondary calcination time. The synthesised catalysts were characterised by various techniques to identify the product compositions. Under visible-light irradiation, the degradation efficiencies and photocatalytic activities of the different catalysts towards rhodamine B (RhB) and 2-hydroxybenzoic acid (2-HBA) were measured via UV–Vis PDA and electron paramagnetic resonance analyses. To explore the degradation mechanism, scavengers were utilised to detect the radicals produced in the photodegradation test. SrBiO2Cl exhibited the best RhB degradation efficiency, of 0.0685 h−1, and SrBiO2Br exhibited a rate of 0.0984 h−1. At 25 °C and 1 atm, the CO2–CH4 photocatalytic conversion efficiencies of the optimised SrBiO2Cl and SrBiO2Br samples increased to 0.037 and 0.053 μmol g−1 h−1, respectively. The findings confirm that the catalysts are highly recyclable and effective for environmental remediation, achieving the objectives of green chemistry. Full article
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