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J. Compos. Sci.
Special Issues
Bimetallic Composites for Oxidation and Reduction Catalysis
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Bimetallic Composites for Oxidation and Reduction Catalysis

A special issue of Journal of Composites Science (ISSN 2504-477X). This special issue belongs to the section "Metal Composites".

Deadline for manuscript submissions: closed (31 October 2021) | Viewed by 8284

Special Issue Editors

Dr. Deshetti Jampaiah

E-Mail Website
Guest Editor
RMIT University, Australia
Interests: bimetallic catalysts; photocatalysis; ceria; CO2 reduction; heterogeneous catalysis
Dr. Vijay Kumar Velisoju

E-Mail Website
Guest Editor
King Abdullah University of Science & Technology (KAUST), Saudi Arabia
Interests: heterogeneous catalysis; hydrogenation; in situ spectroscopy; biomass valorization

Special Issue Information

Dear Colleagues,

In recent years, catalysts containing two or more metals have attracted great attention for different heterogeneous catalytic applications. Of various catalytic applications, oxidation and reduction are the two main processes in converting under-functionalized and over-functionalized starting materials in various fields, such as biomass valorization and fine chemical industry.

In this view, advanced catalytic systems containing dual active composites provide many advantages with enhanced surface properties that offer improved activity and stability of the systems for various catalytic processes that involves redox catalytic processes. Although research on redox catalysis using bimetallic composites has been progressing at a rapid pace, there is still significant room for improvements to investigate structure–activity relationships to further modify catalyst composition and catalytic properties and metal/metal–oxide interactions in order to design more stable and active systems. Hence, processing structure–function relationships is crucial for their future development as innovative bimetallic composite systems.

Therefore, this Special Issue will address the abovementioned points in relation to synthesis, characterization, and catalytic evolution of novel bimetallic nanocomposites that offer new improvements and insights into various oxidation and reduction catalytic processes.

Dr. Deshetti Jampaiah
Dr. Vijay Kumar Velisoju
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. Journal of Composites Science 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 1800 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

  • Bimetallic
  • Reduction
  • Oxidation
  • Catalysts

Published Papers (3 papers)

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Research

13 pages, 4458 KiB  
Article
Investigation of the Effect of Molybdenum Silicide Addition on the Oxidation Behavior of Hafnium Carbonitride
by Veronika Suvorova, Andrey Nepapushev, Dmitrii Suvorov, Kirill Kuskov, Pavel Loginov and Dmitry Moskovskikh
J. Compos. Sci. 2023, 7(1), 25; https://doi.org/10.3390/jcs7010025 - 10 Jan 2023
Cited by 1 | Viewed by 1555
Abstract
In this study, the oxidation stability up to 1000 °C in air of the Hf(C,N)-MoSi2 composites was explored under non-isothermal and isothermal conditions. Composites with 1, 5, 10, and 20% volume fractions were produced by low-energy ball milling and subsequent spark plasma [...] Read more.
In this study, the oxidation stability up to 1000 °C in air of the Hf(C,N)-MoSi2 composites was explored under non-isothermal and isothermal conditions. Composites with 1, 5, 10, and 20% volume fractions were produced by low-energy ball milling and subsequent spark plasma sintering. Differential scanning calorimetry (DSC) and thermogravimetric (TG) coupled with mass spectrometry were used to reveal the staging of the oxidation process depending on the additive content. It was found that samples containing 1 and 5 vol% MoSi2 had the lowest weight gain and the best oxidation behavior. The results of this study were supported by microstructural and phase analyses of the samples after isothermal treatment in a furnace. The samples with the lowest molybdenum disilicide content had a dense and thin protective oxide film on the surface, consisting of hafnium orthosilicate and monoclinic HfO2. The increase in the amount of MoSi2 contributed to the formation of a loose and porous oxide layer due to the increase in the concentration of volatile MoO3. However, all samples exhibited higher oxidation resistance compared to the pure Hf(C,N). Full article
(This article belongs to the Special Issue Bimetallic Composites for Oxidation and Reduction Catalysis)
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12 pages, 3217 KiB  
Article
Fast and Facile Synthesis of Pt Nanoparticles Supported on Ketjen Black by Solution Plasma Sputtering as Bifunctional HER/ORR Catalysts
by Chitlada Mani-Lata, Chadapat Hussakan and Gasidit Panomsuwan
J. Compos. Sci. 2020, 4(3), 121; https://doi.org/10.3390/jcs4030121 - 19 Aug 2020
Cited by 10 | Viewed by 4269
Abstract
Hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR) are two core electrochemical processes involved in hydrogen fuel cell (HFC) technology. ORR is a cathodic reaction occurring in HFC, whereas HER can convert the H2O byproduct from HFCs into H2 [...] Read more.
Hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR) are two core electrochemical processes involved in hydrogen fuel cell (HFC) technology. ORR is a cathodic reaction occurring in HFC, whereas HER can convert the H2O byproduct from HFCs into H2 gas via water splitting. Platinum (Pt)-based catalysts are the most effective catalysts for both reactions. In this work, we used a fast, facile, and chemical-free method, called solution plasma sputtering (SPS), to synthesize Pt nanoparticles supported on Ketjen Black (KB). The discharge time was varied (5, 10, and 20 min) to alter the Pt loading. Characterization results revealed that the plasma did not affect the morphology of KB, and the Pt loading on KB increased with increasing discharge time (5.5–17.9 wt%). Well-crystallized Pt nanoparticles, ~2–5 nm in diameter, were obtained. Electrochemical measurements revealed that Pt/KB exhibited bifunctional catalytic activity toward HER and ORR in 0.5 M H2SO4 solution. Both HER and ORR activities enhanced as the loading of Pt nanoparticles increased with a longer discharge time. Moreover, Pt/KB exhibited better HER and ORR stability than a commercial Pt-based catalyst, which was attributed to the stronger adhesion between Pt nanoparticles and KB support. Thus, SPS can be applied as an alternative synthesis method for preparing Pt/KB catalysts for HER and ORR. Full article
(This article belongs to the Special Issue Bimetallic Composites for Oxidation and Reduction Catalysis)
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12 pages, 2865 KiB  
Article
TiO2@lipophilic Porphyrin Composites: New Insights into Tuning the Photoreduction of Cr(VI) to Cr(III) in Aqueous Phase
by Antonio Pennetta, Sabrina Di Masi, Federica Piras, Xiangfei Lü, Jun Li, Giuseppe Edigio De Benedetto and Giuseppe Mele
J. Compos. Sci. 2020, 4(2), 82; https://doi.org/10.3390/jcs4020082 - 26 Jun 2020
Cited by 5 | Viewed by 1986
Abstract
Metal-free and Cu(II)-lipophilic porphyrins [H2Pp and Cu(II)Pp] loaded on titanium dioxide in the anatase phase (TiO2) were prepared and used as a heterogeneous catalyst for the photoreduction of Cr(VI) to Cr(III) in aqueous suspensions under UV–Vis light irradiation. TiO [...] Read more.
Metal-free and Cu(II)-lipophilic porphyrins [H2Pp and Cu(II)Pp] loaded on titanium dioxide in the anatase phase (TiO2) were prepared and used as a heterogeneous catalyst for the photoreduction of Cr(VI) to Cr(III) in aqueous suspensions under UV–Vis light irradiation. TiO2 impregnated with copper(II) porphyrin [TiO2@Cu(II)Pp] was the most effective in photocatalyst reduction of toxic chromate Cr(VI) to non-toxic chromium Cr(III). We further evaluated an experimental design with the scope of fast optimization of the process conditions related to the use of TiO2 or TiO2-porphyrin based photocatalysts. A full factorial design as a chemometric tool was successfully employed for screening the affecting factors involved in photoconversion catalysis, with the modification of TiO2 both with porphyrin H2Pp and Cu(II)Pp. The studied experimental factors were the catalyst amount, the concentration of Cr(VI) ions, and the pH of the medium. The performed multivariate approach was successfully used for fast fitting and better evaluation of significant factors affecting the experimental responses, with the advantage of reducing the number of available experiments. Thus, the stability of the optimized TiO2 embedded Cu(II)Pp was investigated, confirming the high reproducibility and suitability for environmental purposes. Full article
(This article belongs to the Special Issue Bimetallic Composites for Oxidation and Reduction Catalysis)
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