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Advances in Electrochemistry of Nanomaterials
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Advances in Electrochemistry of Nanomaterials

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

Deadline for manuscript submissions: closed (30 November 2021) | Viewed by 8694

Special Issue Editor

Prof. Anna Ignaszak

E-Mail Website
Guest Editor
University of New Brunswick, Fredericton, Canada
Interests: electrocatalysis; nanostructured materials for energy storage and conversion; electrochemical sensors

Special Issue Information

Dear Colleagues,

Welcome to this Special Issue on “Advances in Electrochemistry of Nanomaterials”. Research associated with electrochemistry of nanomaterials has widely dispersed into important applications, including electrochemical energy storage/conversion such as batteries, capacitors, fuel cells, various aspects of clean energy, electrochemical sensors and biosensors, electrocatalysis, and electrosynthesis. Thus, this Topical Collection focuses on electrochemical approaches used for the design and testing of nanostructured materials as components of electrodes and electrolytes. Our motivation is to review electrochemical concepts of charge and mass transfer and better understand materials’ performances, resulting in effective electrochemical devices. This collection of articles illustrates the diversity and versality of electrochemical strategies that exploit nanoengineered materials as well as the fundamental principles of electrochemistry governing the effects of nanostructure on electrodes, electrolytes, and entire electrochemical systems. I hope this Special Issue will appeal to your research, and that you will enjoy reading about the works of your colleagues in the field.

Prof. Anna Ignaszak
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. 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 2600 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

  • Nanostructured electrocatalysts
  • Electrochemistry of a single particle: metal clusters, Janus objects, nanocarbons
  • Electrochemistry of a molecule: organic, inorganic, polymer, composite, hybrid
  • Electrochemistry on nanoscale thin films
  • Electrochemistry of nanostructured electrodes and electrolytes for energy systems, electrochemical sensors and biosensors
  • Theoretical concepts of nanoelectrochemistry

Published Papers (3 papers)

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Research

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19 pages, 7084 KiB  
Article
Surface Modification of Nanoporous Anodic Alumina during Self-Catalytic Atomic Layer Deposition of Silicon Dioxide from (3-Aminopropyl)Triethoxysilane
by Ana Silvia González, Víctor Vega, Ana Laura Cuevas, María del Valle Martínez de Yuso, Víctor M. Prida and Juana Benavente
Materials 2021, 14(17), 5052; https://0-doi-org.brum.beds.ac.uk/10.3390/ma14175052 - 03 Sep 2021
Cited by 11 | Viewed by 2208
Abstract
Changes associated to atomic layer deposition (ALD) of SiO2 from 3-aminopropyl triethoxysilane (APTES) and O3, on a nanoporous alumina structure, obtained by two-step electrochemical anodization in oxalic acid electrolyte (Ox sample) are analysed. A reduction of 16% in pore size [...] Read more.
Changes associated to atomic layer deposition (ALD) of SiO2 from 3-aminopropyl triethoxysilane (APTES) and O3, on a nanoporous alumina structure, obtained by two-step electrochemical anodization in oxalic acid electrolyte (Ox sample) are analysed. A reduction of 16% in pore size for the Ox sample, used as support, was determined by SEM analysis after its coverage by a SiO2 layer (Ox+SiO2 sample), independently of APTES or O3 modification (Ox+SiO2/APTES and Ox+SiO2/APTES/O3 samples). Chemical surface modification was determined by X-ray photoelectron spectroscopy (XPS) technique during the different stages of the ALD process, and differences induced at the surface level on the Ox nanoporous alumina substrate seem to affect interfacial effects of both samples when they are in contact with an electrolyte solution according to electrochemical impedance spectroscopy (EIS) measurements, or their refraction index as determined by spectroscopic ellipsometry (SE) technique. However, no substantial differences in properties related to the nanoporous structure of anodic alumina (photoluminescent (PL) character or geometrical parameters) were observed between Ox+SiO2/APTES and Ox+SiO2/APTES/O3 samples. Full article
(This article belongs to the Special Issue Advances in Electrochemistry of Nanomaterials)
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19 pages, 9578 KiB  
Article
Insights in the Ionic Conduction inside Nanoporous Metal-Organic Frameworks by Using an Appropriate Equivalent Circuit
by Abhinav Chandresh, Zejun Zhang and Lars Heinke
Materials 2021, 14(16), 4352; https://0-doi-org.brum.beds.ac.uk/10.3390/ma14164352 - 04 Aug 2021
Cited by 2 | Viewed by 2091
Abstract
The conduction of protons and other ions in nanoporous materials, such as metal-organic frameworks (MOFs), is intensively explored with the aim of enhancing the performance of energy-related electrochemical systems. The ionic conductivity, as a key property of the material, is typically determined by [...] Read more.
The conduction of protons and other ions in nanoporous materials, such as metal-organic frameworks (MOFs), is intensively explored with the aim of enhancing the performance of energy-related electrochemical systems. The ionic conductivity, as a key property of the material, is typically determined by using electrochemical impedance spectroscopy (EIS) in connection with a suitable equivalent circuit. Often, equivalent circuits are used where the physical meaning of each component is debatable. Here, we present an equivalent circuit for the ionic conduction of electrolytes in nanoporous, nonconducting materials between inert and impermeable electrodes without faradaic electrode reactions. We show the equivalent circuit perfectly describes the impedance spectra measured for the ion conduction in MOFs in the form of powders pressed into pellets as well as for MOF thin films. This is demonstrated for the ionic conduction of an aprotic ionic liquid, and of various protic solvents in different MOF structures. Due to the clear physical meaning of each element of the equivalent circuit, further insights into the electrical double layer forming at the MOF-electrode interface can be obtained. As a result, EIS combined with the appropriate reference circuit allows us to make statements of the quality of the MOF-substrate interface of different MOF-film samples. Full article
(This article belongs to the Special Issue Advances in Electrochemistry of Nanomaterials)
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Review

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15 pages, 3886 KiB  
Review
Van der Waals Heterostructures—Recent Progress in Electrode Materials for Clean Energy Applications
by Chance Blackstone and Anna Ignaszak
Materials 2021, 14(13), 3754; https://0-doi-org.brum.beds.ac.uk/10.3390/ma14133754 - 05 Jul 2021
Cited by 10 | Viewed by 3660
Abstract
The unique layered morphology of van der Waals (vdW) heterostructures give rise to a blended set of electrochemical properties from the 2D sheet components. Herein an overview of their potential in energy storage systems in place of precious metals is conducted. The most [...] Read more.
The unique layered morphology of van der Waals (vdW) heterostructures give rise to a blended set of electrochemical properties from the 2D sheet components. Herein an overview of their potential in energy storage systems in place of precious metals is conducted. The most recent progress on vdW electrocatalysis covering the last three years of research is evaluated, with an emphasis on their catalytic activity towards the oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and hydrogen evolution reaction (HER). This analysis is conducted in pair with the most active Pt-based commercial catalyst currently utilized in energy systems that rely on the above-listed electrochemistry (metal–air battery, fuel cells, and water electrolyzers). Based on current progress in HER catalysis that employs vdW materials, several recommendations can be stated. First, stacking of the two types vdW materials, with one being graphene or its doped derivatives, results in significantly improved HER activity. The second important recommendation is to take advantage of an electronic coupling when stacking 2D materials with the metallic surface. This significantly reduces the face-to-face contact resistance and thus improves the electron transfer from the metallic surface to the vdW catalytic plane. A dual advantage can be achieved from combining the vdW heterostructure with metals containing an excess of d electrons (e.g., gold). Despite these recent and promising discoveries, more studies are needed to solve the complexity of the mechanism of HER reaction, in particular with respect to the electron coupling effects (metal/vdW combinations). In addition, more affordable synthetic pathways allowing for a well-controlled confined HER catalysis are emerging areas. Full article
(This article belongs to the Special Issue Advances in Electrochemistry of Nanomaterials)
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