Special Issue "Advances in ORR & OER Electrocatalysts"

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Energy Materials".

Deadline for manuscript submissions: 31 July 2020.

Special Issue Editor

Dr. Diana M. Fernandes
Website1 Website2 Website3
Guest Editor
REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Porto, Portugal
Interests: electrocatalysis; energy-related reactions; nanochemistry and nanotechnology; materials chemistry; CO2 valorization
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Special Issue Information

Dear Colleagues,

The current global energy crisis and the negative environmental impacts resulting from the incessant use of fossil fuels have driven scientists to develop novel renewable energy storage and conversion technologies, such as fuel cells, water splitting devices, and metal–air batteries. Electrocatalysis plays a key role in these clean energy devices, enabling the development of several sustainable processes for future technologies. However, the design of highly efficient and cost-effective materials is one of the current major challenges in this field. The commonly employed technologies are expensive due to the use of noble metal-based electrocatalysts, but from the tremendous research efforts, several highly active and stable new materials have emerged.

This Special Issue aims to cover the latest advances on emerging oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) electrocatalysts, including their synthesis and characterization, evaluation of their electrocatalytic performances, as well as a theoretical understanding of ORR and OER that affords rational design strategies for high performance ORR/OER electrocatalysts.

It is my pleasure to invite you to submit a full paper, detailed review, mini-review or significant preliminary communication related to ORR/OER electrocatalysts.

Dr. Diana M. Fernandes
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 papers will be 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. Materials is an international peer-reviewed open access semimonthly 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 2000 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

  • oxygen reduction reaction (ORR)
  • oxygen evolution reaction (OER)
  • electrocatalysts
  • electrode materials
  • fuel cells
  • energy conversion
  • energy storage

Published Papers (2 papers)

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Research

Open AccessArticle
Metal Oxide (Co3O4 and Mn3O4) Impregnation into S, N-doped Graphene for Oxygen Reduction Reaction (ORR)
Materials 2020, 13(7), 1562; https://doi.org/10.3390/ma13071562 - 28 Mar 2020
Abstract
To address aggravating environmental and energy problems, active, efficient, low-cost, and robust electrocatalysts (ECs) are actively pursued as substitutes for the current noble metal ECs. Therefore, in this study, we report the preparation of graphene flakes (GF) doped with S and N using [...] Read more.
To address aggravating environmental and energy problems, active, efficient, low-cost, and robust electrocatalysts (ECs) are actively pursued as substitutes for the current noble metal ECs. Therefore, in this study, we report the preparation of graphene flakes (GF) doped with S and N using 2-5-dimercapto-1,3,4-thiadiazole (S3N2) as precursor followed by the immobilization of cobalt spinel oxide (Co3O4) or manganese spinel oxide (Mn3O4) nanoparticles through a one-step co-precipitation procedure (Co/S3N2–GF and Mn/S3N2–GF). Characterization by different physicochemical techniques (Fourier Transform Infrared (FTIR), Raman spectroscopy, Transmission Electron Microscopy (TEM) and X-ray Diffraction (XRD)) of both composites shows the preservation of the metal oxide spinel structure and further confirms the successful preparation of the envisaged electrocatalysts. Co/S3N2–GF composite exhibits the best ORR performance with an onset potential of 0.91 V vs. RHE, a diffusion-limiting current density of −4.50 mA cm−2 and selectivity for the direct four-electron pathway, matching the results obtained for commercial Pt/C. Moreover, both Co/S3N2–GF and Mn/S3N2–GF showed excellent tolerance to methanol poisoning and good stability. Full article
(This article belongs to the Special Issue Advances in ORR & OER Electrocatalysts)
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Open AccessArticle
FeS2/C Nanowires as an Effective Catalyst for Oxygen Evolution Reaction by Electrolytic Water Splitting
Materials 2019, 12(20), 3364; https://doi.org/10.3390/ma12203364 - 15 Oct 2019
Abstract
Electrolytic water splitting with evolution of both hydrogen (HER) and oxygen (OER) is an attractive way to produce clean energy hydrogen. It is critical to explore effective, but low-cost electrocatalysts for the evolution of oxygen (OER) owing to its sluggish kinetics for practical [...] Read more.
Electrolytic water splitting with evolution of both hydrogen (HER) and oxygen (OER) is an attractive way to produce clean energy hydrogen. It is critical to explore effective, but low-cost electrocatalysts for the evolution of oxygen (OER) owing to its sluggish kinetics for practical applications. Fe-based catalysts have advantages over Ni- and Co-based materials because of low costs, abundance of raw materials, and environmental issues. However, their inefficiency as OER catalysts has caused them to receive little attention. Herein, the FeS2/C catalyst with porous nanostructure was synthesized with rational design via the in situ electrochemical activation method, which serves as a good catalytic reaction in the OER process. The FeS2/C catalyst delivers overpotential values of only 291 mV and 338 mV current densities of 10 mA/cm2 and 50 mA/cm2, respectively, after electrochemical activation, and exhibits staying power for 15 h. Full article
(This article belongs to the Special Issue Advances in ORR & OER Electrocatalysts)
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