Special Issue "Advances in Electrocatalysis"

A special issue of Catalysts (ISSN 2073-4344).

Deadline for manuscript submissions: 31 October 2017

Special Issue Editor

Guest Editor
Prof. Dr. Luísa Margarida Martins

1. ISEL—Instituto Superior de Engenharia de Lisboa, Rua Conselheiro Emídio Navarro 1, 1959-007 Lisboa, Portugal
2. Coordination Chemistry and Catalysis (CCC), CQE—Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
Website | E-Mail
Interests: coordination and sustainable chemistry; homogeneous and supported catalysis; nanomaterials and nanocatalysis; electrochemistry

Special Issue Information

Dear Colleagues,

Electrocatalysis, a type of catalysis that results in the modification of the rate of an electrochemical reaction occurring on an electrode surface, is an indispensable working resource for electrochemists, chemical engineers, biochemical, surface, and materials scientists.

This special field of Electrochemistry has gained notable growth, mainly driven from the urgent need for advanced catalytic materials in electrochemical energy technologies. Progress in this, and other, areas continues to be of primary relevance for the development of highly-efficient and environmentally-benign industrial electrochemical processes.

This Special Issue is aimed at covering emerging and promising strategies for the development of sustainable electrocatalytic processes, focusing on aspects that drive present and future research. Authors with expertise in this topic are cordially invited to submit their manuscripts to Catalysts. Significant full papers and review articles are welcome.

Professor Luísa Margarida Martins
Guest Editor

Related Meeting:

22nd Meeting of the Portuguese Society of Electrochemistry (XXII SPE MEETING)
19–22 June 2017
Ponta Delgada, Azores
http://www.spe2017.com/

Keywords

  • Electrocatalysis for Energy
  • Electrocatalytic (Nano)Materials
  • Electrocatalytic Techniques and Methodologies
  • Electrooxidation of Small Organic Molecules
  • Hydrogen Evolution Reaction
  • Hydrogen Oxidation Reaction
  • Hydrogen Storage
  • Oxygen Evolution Reaction
  • Oxygen Reduction Reaction
  • Nanotechnology in Electrocatalysis
  • Synthetic Electrocatalysis
  • Water-based Electrochemical Devices
  • Water Management

Published Papers (8 papers)

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Research

Open AccessArticle Electrocarboxylation of Dichlorobenzenes on a Silver Electrode in DMF
Catalysts 2017, 7(9), 274; doi:10.3390/catal7090274
Received: 25 August 2017 / Revised: 12 September 2017 / Accepted: 13 September 2017 / Published: 15 September 2017
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Abstract
Carbon dioxide (CO2) is the largest contributor to the greenhouse effect, and fixing and using this greenhouse gas in a facile manner is crucial. This work investigates the electrocarboxylation of dichlorobenzenes with the atmospheric pressure of CO2 in an undivided
[...] Read more.
Carbon dioxide (CO2) is the largest contributor to the greenhouse effect, and fixing and using this greenhouse gas in a facile manner is crucial. This work investigates the electrocarboxylation of dichlorobenzenes with the atmospheric pressure of CO2 in an undivided cell with an Ag cathode and an Mg sacrificial anode. The corresponding carboxylic acids and their derivatives, which are important industrial and fine chemicals, are obtained. To deeply understand this reaction, we investigate the influence of various reaction conditions, such as supporting electrolyte, current density, electric charge, and reaction temperature, on the electrocarboxylation yield by using 1,4-dichlorobenzene as the model compound. The electrochemical behavior of dichlorobenzenes is studied through cyclic voltammetry. The relation among the distinct electronic effects of dichlorobenzenes, the electrochemical characteristics of their reduction, and the distribution law of target products is also established. Full article
(This article belongs to the Special Issue Advances in Electrocatalysis)
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Open AccessArticle SnSx (x = 1, 2) Nanocrystals as Effective Catalysts for Photoelectrochemical Water Splitting
Catalysts 2017, 7(9), 252; doi:10.3390/catal7090252
Received: 1 August 2017 / Revised: 21 August 2017 / Accepted: 24 August 2017 / Published: 25 August 2017
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Abstract
Two-dimensional SnSx (x = 1, 2) nanocrystals are attractive catalysts for photoelectrochemical water splitting as their components are earth abundant and environmentally friendly. We have fabricated SnS thin-film photoelectrodes by spin coating mixed-phase SnS nanocrystals synthesized via a hot-injection technique on glass/Cr/Au
[...] Read more.
Two-dimensional SnSx (x = 1, 2) nanocrystals are attractive catalysts for photoelectrochemical water splitting as their components are earth abundant and environmentally friendly. We have fabricated SnS thin-film photoelectrodes by spin coating mixed-phase SnS nanocrystals synthesized via a hot-injection technique on glass/Cr/Au substrates. The obtained SnS thin films can be transformed into SnS2 by introducing structural phase changes via a facile low-vacuum annealing protocol in the presence of sulfur. This sulfurization process enables the insertion of sulfur atoms between layers of SnS and results in the generation of shallow donors that alter the mechanism for water splitting. The SnS2 thin films are used as stable photocatalysts to drive the oxygen evolution reaction, and the light-current density of 0.195 mA/cm2 at 0.8 V vs. Ag/AgCl can be achieved due to the high carrier density, lower charge transfer resistance, and a suitable reaction band position. Based on a combination of UV-Vis spectroscopy (ultraviolet and visible spectroscopy), cyclic voltammetry and Mott–Schottky analysis, the band positions and band gaps of SnS and SnS2 relative to the electrolyte are determined and a detailed mechanism for water splitting is presented. Our results demonstrate the potential of layered tin sulfide compounds as promising photocatalysts for efficient and large-scale water splitting. Full article
(This article belongs to the Special Issue Advances in Electrocatalysis)
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Open AccessArticle Ethanol Oxidation Reaction on Tandem Pt/Rh/SnOx Catalyst
Catalysts 2017, 7(9), 246; doi:10.3390/catal7090246
Received: 18 July 2017 / Revised: 12 August 2017 / Accepted: 20 August 2017 / Published: 24 August 2017
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Abstract
To elucidate the atomic arrangement of a Pt-Rh-Sn ternary catalyst with a high catalytic activity for ethanol oxidation reaction (EOR) and high CO2 selectivity, we prepared a tandem Pt/Rh/SnOx, in which a Rh adlayer was deposited on a Pt substrate
[...] Read more.
To elucidate the atomic arrangement of a Pt-Rh-Sn ternary catalyst with a high catalytic activity for ethanol oxidation reaction (EOR) and high CO2 selectivity, we prepared a tandem Pt/Rh/SnOx, in which a Rh adlayer was deposited on a Pt substrate (Rh coverage: 0.28), followed by depositing several layers of SnOx only on the Rh surface (Sn coverage: 0.07). For reference, Sn was randomly deposited on the Rh-modified Pt (Pt/Rh) electrode whose Rh and Sn coverages were 0.22 and 0.36 (random Pt/Rh/SnOx). X-ray photoelectron spectroscopy demonstrated that Pt and Rh were metallic, and Sn was largely oxidized. Both Pt/Rh/SnOx electrodes were less positive in onset potential of EOR current density and higher in EOR current density than Pt and Rh/Pt electrodes. In situ infrared reflection-absorption spectroscopy demonstrated that the tandem Pt/Rh/SnOx electrode did not produce acetic acid, but produced CO2 in contrast to the random Pt/Rh/SnOx, suggesting that a tandem arrangement of Pt, Rh and SnOx, in which the Pt and SnOx sites were separated by the Rh sites, was effective for selective CO2 production. In the electrostatic electrolysis at 0.5 V vs. RHE, the tandem Pt/Rh/SnOx electrode exhibited higher EOR current density than the Pt and Pt/Rh electrodes after 1.5 h. Full article
(This article belongs to the Special Issue Advances in Electrocatalysis)
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Open AccessArticle The Differentiating Polarization Curve Technique for the Tafel Parameter Estimation
Catalysts 2017, 7(8), 239; doi:10.3390/catal7080239
Received: 21 July 2017 / Revised: 11 August 2017 / Accepted: 14 August 2017 / Published: 17 August 2017
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Abstract
An experimentally obtained polarization curve for the hydrogen evolution reaction on silver in a 0.5 mol dm−3 solution was investigated using an electrochemical curve technique named the differential polarization method (DPM). The exchange current density estimated by the Tafel extrapolation method (TEM)
[...] Read more.
An experimentally obtained polarization curve for the hydrogen evolution reaction on silver in a 0.5 mol dm−3 solution was investigated using an electrochemical curve technique named the differential polarization method (DPM). The exchange current density estimated by the Tafel extrapolation method (TEM) and the DPM were compared and assessed from points of simple and more accurate handling. It is shown that the DPM has two advantages: (1) proper reading of the Tafel slope region and (2) elimination of the undesirable physical factors such as oxide film and solution resistance. Full article
(This article belongs to the Special Issue Advances in Electrocatalysis)
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Open AccessArticle Electroreduction of CO2 into Ethanol over an Active Catalyst: Copper Supported on Titania
Catalysts 2017, 7(7), 220; doi:10.3390/catal7070220
Received: 15 June 2017 / Revised: 15 July 2017 / Accepted: 18 July 2017 / Published: 20 July 2017
Cited by 1 | PDF Full-text (2722 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
A simple, inexpensive, and novel method was used to prepare electrocatalysts from Cu supported on titanium dioxide (Cu/TiO2). XRD, SEM, and TEM characterizations confirmed different loadings of Cu nanoparticles (NPs) on TiO2. Cyclic voltammetry tests indicated that Cu/TiO2
[...] Read more.
A simple, inexpensive, and novel method was used to prepare electrocatalysts from Cu supported on titanium dioxide (Cu/TiO2). XRD, SEM, and TEM characterizations confirmed different loadings of Cu nanoparticles (NPs) on TiO2. Cyclic voltammetry tests indicated that Cu/TiO2 exhibited lower overpotential for CO2 reduction than that of Cu NPs. Moreover, 40 wt % Cu/TiO2 exhibited the highest faradaic efficiency for ethanol (FEethanol) of 27.4%, which is approximately 10-fold higher than that for Cu NPs (FEethanol = 2.7%). The 40 wt % Cu/TiO2 electrocatalyst exhibits a stable current density of 8.66 mA/cm2 over a 25 h stability test. The high efficiency towards CO2 electroreduction to ethanol may be attributed to the synergistic effect of Cu and TiO2 NPs. This work highlights the importance of compositional effect of NPs on their catalytic activities and provides a strategy for designing efficient catalysts for CO2 electroreduction in the future. Full article
(This article belongs to the Special Issue Advances in Electrocatalysis)
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Open AccessArticle Newly Designed Ternary Metallic PtPdBi Hollow Catalyst with High Performance for Methanol and Ethanol Oxidation
Catalysts 2017, 7(7), 208; doi:10.3390/catal7070208
Received: 13 June 2017 / Revised: 2 July 2017 / Accepted: 6 July 2017 / Published: 10 July 2017
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Abstract
This paper reported the fabrication of ternary metallic PtPdBi hollow nanocatalyst through a facile, one-pot, wet-chemical method by adopting sodium borohydride and polyvinylpyrrolidone as reducing agent and surfactant directing agent, respectively. The hollow structure offers novel morphology and large surface areas, which are
[...] Read more.
This paper reported the fabrication of ternary metallic PtPdBi hollow nanocatalyst through a facile, one-pot, wet-chemical method by adopting sodium borohydride and polyvinylpyrrolidone as reducing agent and surfactant directing agent, respectively. The hollow structure offers novel morphology and large surface areas, which are conducive to enhancing the electrocatalytic activity. The electrocatalytic properties of hollow PtPdBi nanocatalyst were investigated systematically in alkaline media through cyclic voltammetry and the as-prepared PtPdBi nanocatalyst displays greatly enhanced electrocatalytic activities towards methanol and ethanol oxidation. The calculated mass activities of PtPdBi electrocatalyst are 2.133 A mgPtPd−1 for methanol oxidation reaction and 5.256 A mgPtPd−1 for ethanol oxidation reaction, which are much better than that of commercial Pt/C and commercial Pd/C. The as-prepared hollow nanocatalyst may be a potential promising electrocatalyst in fuel cells and also may be extended to the applications of other desirable functions. Full article
(This article belongs to the Special Issue Advances in Electrocatalysis)
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Open AccessArticle Ordered PtSn/C Electrocatalyst: A High Performance Material for the Borohydride Electrooxidation Reaction
Catalysts 2017, 7(7), 198; doi:10.3390/catal7070198
Received: 13 March 2017 / Revised: 2 June 2017 / Accepted: 4 June 2017 / Published: 29 June 2017
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Abstract
This work used a rotating disc electrode and quasi-steady state polarization curves to investigate the sodium borohydride electrooxidation of ordered intermetallic PtSn/C in alkaline solution. Under similar experimental conditions, PtSn/C proved to be a better electrocatalyst than Pt in an overall process that
[...] Read more.
This work used a rotating disc electrode and quasi-steady state polarization curves to investigate the sodium borohydride electrooxidation of ordered intermetallic PtSn/C in alkaline solution. Under similar experimental conditions, PtSn/C proved to be a better electrocatalyst than Pt in an overall process that involved eight electrons. Assays performed in the presence of thiourea and S2− species evidenced that a chemical hydrolysis step took place, followed by electrochemical oxidation of the generated H2. The results presented herein suggest that PtSn/C constitutes a promising electrode material for application in alkaline borohydride fuel cell. Full article
(This article belongs to the Special Issue Advances in Electrocatalysis)
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Open AccessArticle The Effects of CeO2 Nanorods and CeO2 Nanoflakes on Ni–S Alloys in Hydrogen Evolution Reactions in Alkaline Solutions
Catalysts 2017, 7(7), 197; doi:10.3390/catal7070197
Received: 8 May 2017 / Revised: 15 June 2017 / Accepted: 16 June 2017 / Published: 27 June 2017
PDF Full-text (3334 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Composite coatings synthesized by different morphologies of CeO2 in supergravity devices are highly active in hydrogen evolution reactions (HERs). By adding CeO2 nanoflakes (CeO2 Nf) or CeO2 nanorods (CeO2 Nr), the change in the microstructures of composites becomes quite distinct. Moreover, most Ni–S
[...] Read more.
Composite coatings synthesized by different morphologies of CeO2 in supergravity devices are highly active in hydrogen evolution reactions (HERs). By adding CeO2 nanoflakes (CeO2 Nf) or CeO2 nanorods (CeO2 Nr), the change in the microstructures of composites becomes quite distinct. Moreover, most Ni–S alloys are attached on the surface of CeO2 and roughen it compare with pure CeO2. In order to make the expression more concise, this paper uses M instead of Ni–S. At a current density of 10 mA/cm2, overpotentials of Ni–S/CeO2 Nr (M–CeO2 Nr) and Ni–S/CeO2 Nf (M–CeO2 Nf) are 200 mV and 180 mV respectively, which is lower than that of Ni–S (M-0) coating (240 mV). The exchange current density (j0) values of M–CeO2 Nf and M–CeO2 Nr are 7.48 mA/cm2 and 7.40 mA/cm2, respectively, which are higher than that of M-0 (6.39 mA/cm2). Meanwhile, double-layer capacitances (Cdl) values of M–CeO2 Nf (6.4 mF/cm2) and M–CeO2 Nr (6 mF/cm2) are 21.3 times and 20 times of M-0 (0.3 mF/cm2), respectively Full article
(This article belongs to the Special Issue Advances in Electrocatalysis)
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