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Catalysts
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Advancements in Electrochemical Energy Catalysts
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Advancements in Electrochemical Energy Catalysts

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 12360

Special Issue Editor

Prof. Dr. Mohamed Ali Ghanem

E-Mail Website
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 Issues, Collections and Topics in MDPI journals

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 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

  • 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

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Published Papers (3 papers)

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Research

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15 pages, 4695 KiB  
Article
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://doi.org/10.3390/catal11111408 - 20 Nov 2021
Cited by 10 | Viewed by 3378
Abstract
Perovskites of strontium cobalt oxyhalides having the chemical formulae Sr2CoO4-xHx (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 [...] Read more.
Perovskites of strontium cobalt oxyhalides having the chemical formulae Sr2CoO4-xHx (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 (Rct = 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  
Article
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://doi.org/10.3390/catal11080943 - 4 Aug 2021
Cited by 9 | Viewed by 2337
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 [...] Read more.
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 H2O2 to the concentration of the released/added Fe2+ 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  
Review
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://doi.org/10.3390/catal11091050 - 30 Aug 2021
Cited by 25 | Viewed by 5730
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 [...] Read more.
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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