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Catalysts
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Hybrid Materials for Oxygen Electrocatalysis
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Hybrid Materials for Oxygen Electrocatalysis

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

Deadline for manuscript submissions: closed (31 January 2021) | Viewed by 3650

Special Issue Editor

Dr. Ana Jorge Sobrido

E-Mail Website
Guest Editor
Materials Research Institute, School of Engineering and Materials Science, Queen Mary University of London, London, UK
Interests: flow batteries; electrocatalysis; oxygen reduction reaction; oxygen evolution reaction; supercapacitors; electrospinning
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The increase concern in climate change resulting from the use of fossil fuels, has led to researchers over the world to search for sustainable energy conversion and storage technologies, such as metal-air batteries, polymer electrolyte water electrolyzers and polymer electrolyte fuel cells, is of great importance. The oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are the key processes that drive these technologies. However, both suffer from complex multielectron transfer steps. Currently, expensive noble metals such as Ir, Ru (for OER) and Pt (for ORR) are applied as electrocatalysts, making their large-scale implementation extremely challenging. In this context, designing advanced nanostructured materials based on low-cost abundant compounds, that exhibit high electrocatalytic activity towards oxygen reduction and / or evolution reactions, is among the hottest research topics in the current energy landscape.

This Special Issue of Catalysts on “Hybrid Materials for Oxygen Electrocatalysis” is devoted to new materials for oxygen electrocatalysis, with a special focus on hybrid materials and advanced new methods, including in situ and operando techniques, which can lead to a better understanding of structure–performance relationships. It is therefore my pleasure to invite you to contribute to this Special Issue with your research article, communication, or review.

Dr. Ana Jorge Sobrido
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

  • oxygen electrocatalysis
  • oxygen evolution reaction
  • oxygen reduction reaction
  • bifunctional electrocatalysts
  • hybrid materials
  • energy conversion
  • energy storage

Published Papers (1 paper)

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Research

20 pages, 3246 KiB  
Article
Bifunctional Electrocatalyst of Low-Symmetry Mesoporous Titanium Dioxide Modified with Cobalt Oxide for Oxygen Evolution and Reduction Reactions
by Mabrook S. Amer, Mohamed A. Ghanem, Prabhakarn Arunachalam, Abdullah M. Al-Mayouf and Sultan M. Hadadi
Catalysts 2019, 9(10), 836; https://doi.org/10.3390/catal9100836 - 08 Oct 2019
Cited by 21 | Viewed by 3173
Abstract
Hybrids of low-symmetry (disordered) mesoporous titanium dioxide modified with different weight ratios of cobalt oxide nanoparticles (Co3O4(x)/lsm-TiO2) are prepared using a one-pot self-assembly surfactant template. The physicochemical characterization of Co3O4 [...] Read more.
Hybrids of low-symmetry (disordered) mesoporous titanium dioxide modified with different weight ratios of cobalt oxide nanoparticles (Co3O4(x)/lsm-TiO2) are prepared using a one-pot self-assembly surfactant template. The physicochemical characterization of Co3O4(x)/lsm-TiO2 hybrids by scanning and transmission electron microscopy, X-ray diffraction, N2 adsorption–desorption isotherms, and X-ray photoelectron spectroscopy confirm the successful incorporation of cobalt oxide nanoparticles (2–3 nm in diameter) with preservation of the highly mesoporous structure of titanium dioxide substrate. Among these mesoporous hybrids, the ~3.0 wt.% Co3O4/lsm-TiO2 exhibits the best performance toward both the oxygen evolution (OER) and reduction (ORR) reactions in alkaline solution. For the OER, the hybrid shows oxidation overpotential of 348 mV at 10 mA cm−2, a turnover frequency (TOF) of 0.034 s−1, a Tafel slope of 54 mV dec−1, and mass activity of 42.0 A g−1 at 370 mV. While for ORR, an onset potential of 0.84 V vs. RHE and OER/ORR overpotential gap (ΔE) of 0.92 V are achieved which is significantly lower than that of commercial Pt/C, hexagonal mesoporous, and bulk titanium dioxide analogous. The Co3O4/lsm-TiO2 hybrid demonstrates significantly higher long-term durability than IrO2. Apparently, such catalytic activity performance originates from the synergetic effect between Co3O4 and TiO2 substrate, in addition to higher charge carrier density and the presence of disordered mesopores which provide short ions diffusion path during the electrocatalytic process. Full article
(This article belongs to the Special Issue Hybrid Materials for Oxygen Electrocatalysis)
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