Special Issue "Design of Nanocatalysts and Electrodes: Application to Fuel Cell and Water Electrolysis"

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Energy and Catalysis".

Deadline for manuscript submissions: 17 June 2021.

Special Issue Editor

Prof. Dr. Namgee Jung
Website
Guest Editor
Graduate School of Energy Science and Technology (GEST), Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea
Interests: electrocatalysts; hybrid nanomaterials; electrode design; electrochemical analysis; fuel cells; water electrolysis; hydrogen production

Special Issue Information

Dear Colleagues,

As global warming becomes serious due to increased CO2 emissions from the combustion of fossil fuels, the demand for alternative energy resources is continuously growing. Fuel cells such as proton-exchange membrane fuel cells (PEMFCs) and anion-exchange membrane fuel cells (AEMFCs) using H2 as a fuel are one of the promising eco-friendly energy conversion devices since they produce electricity without pollution. Furthermore, strategies for the production and storage of H2 fuel have been extensively studied to accelerate the commercialization of fuel cell systems. In fuel cell applications, to decrease the use of expensive Pt or to replace the Pt-based catalysts by non-Pt- or carbon-based catalysts, scientist have proposed new ideas centered on the modification of catalyst structures. In the field of water electrolysis research, interesting approaches for the design of novel electrode and catalyst structures have been developed.

In this Special Issue, recent advances and novel ideas regarding the design of nanomaterials and electrode structures for fuel cell and water electrolysis systems are presented. This collection also covers the electrochemical analysis of nanomaterials for H2 oxidation/evolution, O2 reduction/evolution, and methanol oxidation reactions in electrochemical energy conversion systems.

This Special Issue is open to original research articles, as well as review papers, that help researchers worldwide understand the latest trend and progress in fuel cell and water electrolysis research.

Prof. Dr. Namgee Jung
Guest Editor

Manuscript Submission Information

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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. Nanomaterials 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

  • fabrication of electrocatalysts
  • new design of electrodes & nanomaterials
  • oxygen reduction reaction
  • hydrogen oxidation reaction
  • methanol oxidation reaction
  • oxygen evolution reaction
  • hydrogen evolution reaction
  • fuel cell
  • water electrolysis
  • hydrogen production & storage

Published Papers (3 papers)

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Research

Open AccessArticle
Black-Si as a Photoelectrode
Nanomaterials 2020, 10(5), 873; https://doi.org/10.3390/nano10050873 - 01 May 2020
Cited by 3
Abstract
The fabrication and characterization of photoanodes based on black-Si (b-Si) are presented using a photoelectrochemical cell in NaOH solution. B-Si was fabricated by maskless dry plasma etching and was conformally coated by tens-of-nm of TiO2 using atomic layer deposition (ALD) with a [...] Read more.
The fabrication and characterization of photoanodes based on black-Si (b-Si) are presented using a photoelectrochemical cell in NaOH solution. B-Si was fabricated by maskless dry plasma etching and was conformally coated by tens-of-nm of TiO2 using atomic layer deposition (ALD) with a top layer of CoO x cocatalyst deposited by pulsed laser deposition (PLD). Low reflectivity R < 5 % of b-Si over the entire visible and near-IR ( λ < 2   μ m) spectral range was favorable for the better absorption of light, while an increased surface area facilitated larger current densities. The photoelectrochemical performance of the heterostructured b-Si photoanode is discussed in terms of the n-n junction between b-Si and TiO2. Full article
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Open AccessArticle
Modulating Catalytic Activity and Durability of PtFe Alloy Catalysts for Oxygen Reduction Reaction Through Controlled Carbon Shell Formation
Nanomaterials 2019, 9(10), 1491; https://doi.org/10.3390/nano9101491 - 19 Oct 2019
Cited by 5
Abstract
Demand on synthetic approaches to high performance electrocatalyst with enhanced durability is increasing for fuel cell applications. In this work, we present a facile synthesis of carbon shell-coated PtFe nanoparticles by using acetylacetonates in metal precursors as carbon sources without an additional polymer [...] Read more.
Demand on synthetic approaches to high performance electrocatalyst with enhanced durability is increasing for fuel cell applications. In this work, we present a facile synthesis of carbon shell-coated PtFe nanoparticles by using acetylacetonates in metal precursors as carbon sources without an additional polymer coating process for the carbon shell formation. The carbon shell structure is systematically controlled by changing the annealing conditions such as the temperature and gas atmosphere. PtFe catalysts annealed at 700 °C under H2-mixed N2 gas show much higher oxygen reduction reaction (ORR) activity and superior durability compared to a Pt catalyst due to the ultrathin and porous carbon shells. In addition, when increasing the annealing temperature, the carbon shells encapsulating the PtFe nanoparticles improves the durability of the catalysts due to the enhanced crystallinity of the carbon shells. Therefore, it is demonstrated that the developed hybrid catalyst structure with the carbon shells not only allows the access of reactant molecules to the active sites for oxygen reduction reaction but also prevents the agglomeration of metal nanoparticles on carbon supports, even under harsh operating conditions. The proposed synthetic approach and catalyst structure are expected to provide more insights into the development of highly active and durable catalysts for practical fuel cell applications. Full article
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Open AccessFeature PaperArticle
Electrochemical Analysis for Demonstrating CO Tolerance of Catalysts in Polymer Electrolyte Membrane Fuel Cells
Nanomaterials 2019, 9(10), 1425; https://doi.org/10.3390/nano9101425 - 08 Oct 2019
Cited by 4
Abstract
Since trace amounts of CO in H2 gas produced by steam reforming of methane causes severe poisoning of Pt-based catalysts in polymer electrolyte membrane fuel cells (PEMFCs), research has been mainly devoted to exploring CO-tolerant catalysts. To test the electrochemical property of [...] Read more.
Since trace amounts of CO in H2 gas produced by steam reforming of methane causes severe poisoning of Pt-based catalysts in polymer electrolyte membrane fuel cells (PEMFCs), research has been mainly devoted to exploring CO-tolerant catalysts. To test the electrochemical property of CO-tolerant catalysts, chronoamperometry is widely used under a CO/H2 mixture gas atmosphere as an essential method. However, in most cases of catalysts with high CO tolerance, the conventional chronoamperometry has difficulty in showing the apparent performance difference. In this study, we propose a facile and precise test protocol to evaluate the CO tolerance via a combination of short-term chronoamperometry and a hydrogen oxidation reaction (HOR) test. The degree of CO poisoning is systematically controlled by changing the CO adsorption time. The HOR polarization curve is then measured and compared with that measured without CO adsorption. When the electrochemical properties of PtRu alloy catalysts with different atomic ratios of Pt to Ru are investigated, contrary to conventional chronoamperometry, these catalysts exhibit significant differences in their CO tolerance at certain CO adsorption times. The present work will facilitate the development of catalysts with extremely high CO tolerance and provide insights into the improvement of electrochemical methods. Full article
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