Special Issue "Electro-Catalysts for Energy Conversion and Storage Devices"

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

Deadline for manuscript submissions: 29 February 2020.

Special Issue Editor

Guest Editor
Dr. Vincenzo Baglio Website E-Mail
CNR-ITAE Institute for Advanced Energy Technologies "N. Giordano", Via Salita S. Lucia sopra Contesse 5, Messina 98126, Italy
Phone: +39 090624401
Interests: direct alcohol fuel cells; electrocatalysis; polymer electrolyte fuel cells; water electrolysis; metal–air batteries; dye-sensitized solar cells; photo-electrolysis; carbon dioxide electro-reduction

Special Issue Information

Dear Colleagues,

Today, with the threatening energy crisis and global warming, electrochemistry faces a great challenge as a discipline interfacing chemistry and electrical engineering. The efficient conversion and storage of energy are closely correlated to the development of electrochemical energy technologies, such as fuel cells, batteries and electrolyzers. Such devices are claimed to dominate the power supply market in a future sustainable energy economy. The practical efficiencies must be yet boosted before many of the aforementioned technologies become viable for large-scale use. In particular, more active, stable, and economically viable catalysts must be developed for the electrocatalytic processes occurring at practical electrodes of the cells. In this context, the research and development of efficient catalysts are key points to reach this target. This Special Issue is intended to present and discuss the most recent advances and developments in heterogeneous catalysis for application in electrochemical energy conversion and storage devices.

Dr. Vincenzo Baglio
Guest Editor

Manuscript Submission Information

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Keywords

  • Polymer Electrolyte Fuel Cells (PEFC)
  • Direct Alcohol Fuel Cells (DAFC)
  • Solid Oxide Fuel Cells (SOFC)
  • Polymer electrolyte and solid oxide electrolysers
  • Metal-air batteries
  • Advances in the design and synthesis of electrocatalysts
  • Advanced carbonaceous, non-carbonaceous, and hybrid support for electrocatalysts
  • Oxygen reduction and/or evolution reactions
  • Electro-oxidation of alcohols and other organic fuels (formic acid, glycols, etc.)
  • Hydrogen oxidation and/or evolution reactions

Published Papers (4 papers)

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Research

Open AccessArticle
In-situ Quantification of Nanoparticles Oxidation: A Fixed Energy X-ray Absorption Approach
Catalysts 2019, 9(8), 659; https://doi.org/10.3390/catal9080659 - 31 Jul 2019
Abstract
The oxidation of palladium nanoparticles causes the performance degradation of alkaline direct ethanol fuel cells. Quantifying this oxidation is a task of tremendous importance to design mitigation strategies that extend the service life of catalysts and devices. Here, we show that the Fixed [...] Read more.
The oxidation of palladium nanoparticles causes the performance degradation of alkaline direct ethanol fuel cells. Quantifying this oxidation is a task of tremendous importance to design mitigation strategies that extend the service life of catalysts and devices. Here, we show that the Fixed Energy X-ray Absorption Voltammetry (FEXRAV) can provide this information with an in-situ approach. To do so, we have developed a quantification method that assumes the linear response at fixed energy. With this method, we have investigated the oxidation of carbon black-supported palladium electrocatalysts during cyclic voltammetry in the same solution employed as a fuel in the direct ethanol fuel cells. We have shown that up to 38% of the palladium is oxidised at 1.2 V vs. RHE and that such oxidation also happens at lower potentials that the catalyst can experience in real direct ethanol fuel cells. The result of this study is a proof of concept of quantitative FEXRAV. Full article
(This article belongs to the Special Issue Electro-Catalysts for Energy Conversion and Storage Devices)
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Open AccessArticle
Point-Defect-Rich Carbon Sheets as the High-Activity Catalyst Toward Oxygen Reduction and Hydrogen Evolution
Catalysts 2019, 9(4), 386; https://doi.org/10.3390/catal9040386 - 25 Apr 2019
Cited by 1
Abstract
Exploring a novel approach for the synthesis of oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) catalysts with inexpensive and high-activity is desirable. Herein, we report a bubble templating method to synthesize the graphene-like mesoporous carbon sheets with point defects as ORR/HER [...] Read more.
Exploring a novel approach for the synthesis of oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) catalysts with inexpensive and high-activity is desirable. Herein, we report a bubble templating method to synthesize the graphene-like mesoporous carbon sheets with point defects as ORR/HER bifunctional electrocatalysts. The typical product shows excellent ORR performance including the positive onset potential (740 mV) and high diffusion-limiting current density (4.07 mA cm−2). Along with small Tafel slopes, the overpotential is determined to be about −453 and −378 mV at 10 mA cm−2 in both alkaline and acidic media, which suggests a good candidate for HER reaction as well. The superior catalytic activities are derived from the abundant point defects on the mesoporous carbon sheets surface, especially the existence of pyridinic and pyrrolic nitrogen species. This study may be an alternative route to prepare the novel functional materials for the applications of ORR and HER. Full article
(This article belongs to the Special Issue Electro-Catalysts for Energy Conversion and Storage Devices)
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Open AccessArticle
Pt/C and Pt/SnOx/C Catalysts for Ethanol Electrooxidation: Rotating Disk Electrode Study
Catalysts 2019, 9(3), 271; https://doi.org/10.3390/catal9030271 - 16 Mar 2019
Cited by 1
Abstract
Pt/C and Pt/SnOx/C catalysts were synthesized using the polyol method. Their structure, morphology and chemical composition were studied using a scanning electron microscope equipped with an energy dispersive X-ray spectrometer, transition electron microscope and X-ray photoelectron spectroscope. Electrochemical measurements were based [...] Read more.
Pt/C and Pt/SnOx/C catalysts were synthesized using the polyol method. Their structure, morphology and chemical composition were studied using a scanning electron microscope equipped with an energy dispersive X-ray spectrometer, transition electron microscope and X-ray photoelectron spectroscope. Electrochemical measurements were based on the results of rotating disk electrode (RDE) experiments applied to ethanol electrooxidation. The quick evaluation of catalyst activity, electrochemical behavior, and an average number of transferred electrons were made using the RDE technique. The usage of SnOx (through the carbon support modification) in a binary system together with Pt causes a significant increase of the catalyst activity in ethanol oxidation reaction and the utilization of ethanol. Full article
(This article belongs to the Special Issue Electro-Catalysts for Energy Conversion and Storage Devices)
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Open AccessArticle
Comparative Study between Pristine Ag and Ag Foam for Electrochemical Synthesis of Syngas with Carbon Dioxide and Water
Catalysts 2019, 9(1), 57; https://doi.org/10.3390/catal9010057 - 08 Jan 2019
Cited by 1
Abstract
The electrosynthesis of syngas (H2 + CO) from CO2 and H2O can reduce greenhouse gas emissions and address the energy crisis. In the present work, silver (Ag) foam was employed as a catalytic electrode for the electrochemical reduction of [...] Read more.
The electrosynthesis of syngas (H2 + CO) from CO2 and H2O can reduce greenhouse gas emissions and address the energy crisis. In the present work, silver (Ag) foam was employed as a catalytic electrode for the electrochemical reduction of CO2 in aqueous solution to design different syngas ratios (H2:CO). In addition to H2 and CO, a small amount of formic acid was found in the liquid phase. By contrast, the planar polycrystalline Ag yields CO, formic acid, methane and methanol as the carbon-containing products. During the potential-controlled electrolysis, the Ag foam displayed a relatively higher activity and selectivity in the electroreduction of aqueous CO2 to CO compared with its smooth surface counterpart, as evidenced by the lower onset potential, higher partial current density and Faradic efficiency at the same bias voltage. Moreover, the electrode remained stable after three successive cycles. Based on the characterization using X-ray diffraction, field-emission scanning electron microscopy, high-resolution transmission electron microscopy, potential step determination and density functional theory calculations, superior performance was credited to the three-dimensional structure of Ag foam constructed with coral-like Ag particles, in which the numerous edge sites are beneficial for the stabilization of the surface adsorbed COOH species and the exposed {111} facets favor the desorption of adsorbed CO species. Full article
(This article belongs to the Special Issue Electro-Catalysts for Energy Conversion and Storage Devices)
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