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Advancements in Electrochemical Energy Catalysts

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

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 9057

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Special Issue Editor

Prof. Dr. Mohamed Ali Ghanem

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Guest Editor

Electrochemical Sciences Research Chair (ESRC), Chemistry Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
Interests: electrocatalysis; photocatalysis; electrodeposition; biosensors, nanostructured materials; electrochemical energy production and storage

Special Issue Information

Dear Colleagues,

Recently, global energy demands have been increased due to worldwide population and economic growth, and alternative sustainable, clean, and inexpensive energy production and storage sources are urgently required. Therefore, catalysts for photo- and electrochemical energy production and storage reactions have attracted enormous research interest. In particular, nanostructured catalysts have demonstrated significantly enhanced performance for electrochemical energy reactions and applications. This Special Issue invites authors to submit their original research articles, communications, progress work, and review articles focused on advanced catalysts for electrochemical energy production and storage reactions and applications. The catalyst types covered here include (but are not limited to) nanostructured photo- and electrocatalysts with different shapes, sizes, and morphologies; transition-metal-based catalysts; perovskites; and carbon- and modified-carbon-based catalysts. The electrochemical energy reactions covered in this issue include all types of fuel cell reactions involving hydrogen, methanol, urea, hydrogen peroxide, hydrides, and small organic molecule oxidation and oxygen reduction reactions. Moreover, articles that discuss photo- and electrocatalysts for hydrogen production, water-splitting reactions, carbon dioxide reduction, and utilization reactions are welcomed. Finally, submissions considering catalysts for energy storage reactions in batteries and supercapacitors are strongly encouraged.

Prof. Dr. Mohamed Ali Ghanem
Guest Editor

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 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

Transition-metal-based photo- and electrocatalysts
Nanostructured catalysts
Carbon- and modified-carbon-based catalysts
Fuel cell reactions, water photo-electro-splitting
Hydrogen production catalysts
Supercapacitor and battery catalysts

Published Papers (3 papers)

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Research

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15 pages, 4695 KiB

Open AccessArticle

Halide-Doping Effect of Strontium Cobalt Oxide Electrocatalyst and the Induced Activity for Oxygen Evolution in an Alkaline Solution

by Mohamed A. Ghanem, Mabrook S. Amer, Abdullah M. Al-Mayouf, Prabhakarn Arunachalam and Mark T. Weller

Catalysts 2021, 11(11), 1408; https://0-doi-org.brum.beds.ac.uk/10.3390/catal11111408 - 20 Nov 2021

Cited by 7 | Viewed by 2512

Abstract

Perovskites of strontium cobalt oxyhalides having the chemical formulae Sr₂CoO_4-xH_x (H = F, Cl, and Br; x = 0 and 1) were prepared using a solid-phase synthesis approach and comparatively evaluated as electrocatalysts for oxygen evolution in an alkaline solution. The perovskite electrocatalyst crystal phase, surface morphology, and composition were examined by X-ray diffraction, a scanning electron microscope, and energy-dispersive X-ray (EDX) mapping. The electrochemical investigations of the oxyhalides catalysts showed that the doping of F, Cl, or Br into the Sr₂CoO₄ parent oxide enhances the electrocatalytic activity for the oxygen evolution reaction (OER) with the onset potential as well as the potential required to achieve a current density of 10 mA/cm² shifting to lower potential values in the order of Sr₂CoO₄ (1.64, 1.73) > Sr₂CoO₃Br (1.61, 1.65) > Sr₂CoO₃Cl (1.53, 1.60) > Sr₂CoO₃F (1.50, 1.56) V vs. HRE which indicates that Sr₂CoO₃F is the most active electrode among the studied catalysts under static and steady-state conditions. Moreover, Sr₂CoO₃F demonstrates long-term stability and remarkably less charge transfer resistance (R_ct = 36.8 ohm) than the other oxyhalide counterparts during the OER. The doping of the perovskites with halide ions particularly the fluoride-ion enhances the surface oxygen vacancy density due to electron withdrawal away from the Co-atom which improves the ionic and electronic conductivity as well as the electrochemical activity of the oxygen evolution in alkaline solution. Full article

(This article belongs to the Special Issue Advancements in Electrochemical Energy Catalysts)

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23 pages, 3339 KiB

Open AccessFeature PaperArticle

Simultaneous Galvanic Generation of Fe²⁺ Catalyst and Spontaneous Energy Release in the Galvano-Fenton Technique: A Numerical Investigation of Phenol’s Oxidation and Energy Production and Saving

by Kaouther Kerboua, Oualid Hamdaoui, Naoufel Haddour and Abdulaziz Alghyamah

Catalysts 2021, 11(8), 943; https://0-doi-org.brum.beds.ac.uk/10.3390/catal11080943 - 04 Aug 2021

Cited by 6 | Viewed by 1643

Abstract

The present paper investigates the potential of the Galvano-Fenton process as an advanced technique in terms of the simultaneous oxidation of a model pollutant, phenol, and the energy release and saving as compared to conventional electrochemical techniques, namely, Fenton, Fenton-like, and Electro-Fenton. A numerical model describing the electrochemical, electrolytic, and phenol’s mineralization reactions is presented. Simulations are conducted to predict the kinetics of ferrous and ferric ions, radicals’ formation, and phenol degradation along with released power. Parametric analysis and comparisons are also performed between the basic configuration of the Galvano-Fenton process and its upgraded version integrating a pre-immersion stage of the electrodes in the electrolyte equivalent to 25% of the total experiment’s duration. The ratio of the initial concentration of

H_{2} O_{2}

to the concentration of the released/added

F e^{2 +}

catalyst is varied from 10 to 30. The effect of phenol concentration is inspected over the range of 0.188 to 10 mg/L as well. Compared to conventional Fenton-based techniques, the Galvano-Fenton process demonstrated a higher performance by reaching 1.34% of degradation efficiency per released J. This is associated with the generation of hydroxyl radicals of 0.047 nM/released J with initial concentrations of hydrogen peroxide and phenol of 0.187 mM and 2 µM, respectively. Moreover, the integration of the pre-immersion stage allowed the overcoming the barrier of the null degradation rate at the initial instant. Full article

(This article belongs to the Special Issue Advancements in Electrochemical Energy Catalysts)

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Review

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27 pages, 57319 KiB

Open AccessReview

Pt-Based Intermetallic Nanocrystals in Cathode Catalysts for Proton Exchange Membrane Fuel Cells: From Precise Synthesis to Oxygen Reduction Reaction Strategy

by Peng Gao, Min Pu, Qingjun Chen and Hong Zhu

Catalysts 2021, 11(9), 1050; https://0-doi-org.brum.beds.ac.uk/10.3390/catal11091050 - 30 Aug 2021

Cited by 20 | Viewed by 4156

Abstract

Although oxygen reduction reaction (ORR) catalysts have been extensively investigated and developed, there is a lack of clarity on catalysts that can balance high performance and low cost. Pt-based intermetallic nanocrystals are of special interest in the commercialization of proton exchange membrane fuel cells (PEMFCs) due to their excellent ORR activity and stability. This review summarizes the wide range of applications of Pt-based intermetallic nanocrystals in cathode catalysts for PEMFCs and their unique advantages in the field of ORR. Firstly, we introduce the fundamental understanding of Pt-based intermetallic nanocrystals, and highlight the difficulties and countermeasures in their synthesis. Then, the progress of theoretical and experimental studies related to the ORR activity and stability of Pt-based intermetallic nanocrystals in recent years are reviewed, especially the integrated strategies for enhancing the stability of ORR. Finally, the challenges faced by Pt-based intermetallic nanocrystals are summarized and future research directions are proposed. In addition, numerous design ideas of Pt-based intermetallic nanocrystals as ORR catalysts are summarized, aiming to promote further development of commercialization of PEMFC catalysts while fully understanding Pt-based intermetallic nanocrystals. Full article

(This article belongs to the Special Issue Advancements in Electrochemical Energy Catalysts)

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