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Nanomaterials
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Nanocatalysts for Electro-Oxidation
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Nanocatalysts for Electro-Oxidation

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

Deadline for manuscript submissions: closed (15 October 2021) | Viewed by 7662

Special Issue Editor

Dr. Palaniappan Subramanian

E-Mail Website
Guest Editor
New Technologies-Research Center, University of West Bohemia, 30100 Plzen, Czech Republic
Interests: electrochemistry; nanocatalyst; nanomaterials for electrochemical energy devices; bifunctional electrochemical devices; power to chemicals and fuels; biosensors; chemosensors
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Electrochemical oxidation is an important process being a critical part of several technologically relevant devices such as fuel cells, electrolyzers, and electrochemical sensors and biosensors. Electro-oxidation involves the removal of electrons from chemical substance under  electric potential. The advent of nanotechnology has heralded a new era in developing catalytic electrode materials for several important electrochemical reactions, such as water oxidation and oxidation of small molecules like hydrogen, ammonia, urea, and methanol. It is imperative to emphasize the electronic structure and high surface area attribute to the nanosize are the main enhancing factors of the anodic reactions.  The nanostructured electrode materials for electro-oxidation reactions are designed,  synthesized, and characterized using advanced in-situ and ex-situ spectroscopic and microscopic techniques. Having said that, the activity and selectivity of electrochemical oxidation reactions is governed by many factors, including electrolyte pH, nature of the electrolyte,  catalyst support, the electrochemically active surface area of nanocatalyst and support, the density of catalytic sites present in the electrodes. Apart from activity and selectivity, stability of nanosize catalyst is a crucial factor in industrial-scale fuel cells or  electrolyzers.

All synthetic methods and approaches to prepare nanocatalyst for electrochemical oxidation processes, in-situ/ex-situ spectroscopic and microscopic methods to probe the structure of the nanocatalysts, articles on the investigation of the stability of nanocatalysts, novel methods to improve the dispersion of nanocatalyst on supports are welcome.

We particularly welcome articles that present the study of structure-electrochemical activity relationships and those that contribute toward the understanding of nanocatalyst design principles. We invite submissions of original research articles or comprehensive reviews.


Dr. Palaniappan Subramanian
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. Nanomaterials 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 2400 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

  • Nanostructures
  • Novel catalyst supports
  • Nanocomposites
  • Electrochemical oxidation of small organic molecules
  • Electrochemical water splitting
  • Hydrogen anodes in acidic /alkaline electrolytes
  • Small organic molecules oxidation
  • Ammonia anodic oxidation
  • New synthetic approaches for fabrication of nano catalysts
  • Structure, property, and electro-oxidation relationships of nanocatalyst
  • Stability aspects of nanocatalyst electrodes
  • In-operando/in-situ spectroscopic diagnostic methods
  • Electrode anodic kinetics and mechanistic invetigations
  • Nanocatalyst application in industrial-scale devices

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Published Papers (2 papers)

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Research

13 pages, 2282 KiB  
Article
Optimization of Oxygen Evolution Reaction with Electroless Deposited Ni–P Catalytic Nanocoating
by Sergio Battiato, Mario Urso, Salvatore Cosentino, Anna Lucia Pellegrino, Salvo Mirabella and Antonio Terrasi
Nanomaterials 2021, 11(11), 3010; https://doi.org/10.3390/nano11113010 - 9 Nov 2021
Cited by 21 | Viewed by 3415
Abstract
The low efficiency of water electrolysis mostly arises from the thermodynamic uphill oxygen evolution reaction. The efficiency can be greatly improved by rationally designing low-cost and efficient oxygen evolution anode materials. Herein, we report the synthesis of Ni–P alloys adopting a facile electroless [...] Read more.
The low efficiency of water electrolysis mostly arises from the thermodynamic uphill oxygen evolution reaction. The efficiency can be greatly improved by rationally designing low-cost and efficient oxygen evolution anode materials. Herein, we report the synthesis of Ni–P alloys adopting a facile electroless plating method under mild conditions on nickel substrates. The relationship between the Ni–P properties and catalytic activity allowed us to define the best conditions for the electroless synthesis of highperformance Ni–P catalysts. Indeed, the electrochemical investigations indicated an increased catalytic response by reducing the thickness and Ni/P ratio in the alloy. Furthermore, the Ni–P catalysts with optimized size and composition deposited on Ni foam exposed more active sites for the oxygen evolution reaction, yielding a current density of 10 mA cm−2 at an overpotential as low as 335 mV, exhibiting charge transfer resistances of only a few ohms and a remarkable turnover frequency (TOF) value of 0.62 s−1 at 350 mV. The present study provides an advancement in the control of the electroless synthetic approach for the design and large-scale application of high-performance metal phosphide catalysts for electrochemical water splitting. Full article
(This article belongs to the Special Issue Nanocatalysts for Electro-Oxidation)
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14 pages, 4031 KiB  
Article
Co Nanoparticle-Encapsulated Nitrogen-Doped Carbon Nanotubes as an Efficient and Robust Catalyst for Electro-Oxidation of Hydrazine
by Hui Wang, Qing Dong, Lu Lei, Shan Ji, Palanisamy Kannan, Palaniappan Subramanian and Amar Prasad Yadav
Nanomaterials 2021, 11(11), 2857; https://doi.org/10.3390/nano11112857 - 26 Oct 2021
Cited by 5 | Viewed by 3374
Abstract
Structural engineering is an effective methodology for the tailoring of the quantities of active sites in nanostructured materials for fuel cell applications. In the present study, Co nanoparticles were incorporated into the network of 3D nitrogen-doped carbon tubes (Co@NCNTs) that were obtained via [...] Read more.
Structural engineering is an effective methodology for the tailoring of the quantities of active sites in nanostructured materials for fuel cell applications. In the present study, Co nanoparticles were incorporated into the network of 3D nitrogen-doped carbon tubes (Co@NCNTs) that were obtained via the molten-salt synthetic approach at 800 °C. Morphological representation reveals that the Co@NCNTs are encompassed with Co nanoparticles on the surface of the mesoporous walls of the carbon nanotubes, which offers a significant active surface area for electrochemical reactions. The CoNPs/NCNTs-1 (treated with CaCl2) nanomaterial was used as a potential candidate for the electro-oxidation of hydrazine, which improved the response of hydrazine (~8.5 mA) in 1.0 M NaOH, as compared with CoNPs/NCNTs-2 (treated without CaCl2), NCNTs, and the unmodified GCE. Furthermore, the integration of Co helps to improve the conductivity and promote the lower onset electro-oxidation potential (−0.58 V) toward the hydrazine electro-oxidation reaction. In particular, the CoNPs/NCNTs-1 catalysts showed significant catalytic activity and stability performances i.e., the i-t curves showed notable stability when compared with their initial current responses, even after 10 days, which indicates the significant durability of the catalyst materials. This work could present a new approach for the design of efficient electrode materials, which can be used as a favorable candidate for the electro-oxidation of liquid fuels in fuel cell applications. Full article
(This article belongs to the Special Issue Nanocatalysts for Electro-Oxidation)
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