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Micromachines
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Nanotechnology for Electrochemistry Applications
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Nanotechnology for Electrochemistry Applications

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "C：Chemistry".

Deadline for manuscript submissions: 10 June 2024 | Viewed by 3224

Special Issue Editors

Dr. Lemma Teshome Tufa

E-Mail Website
Guest Editor
Institute of Materials Chemistry, Department of Chemistry, Chungnam National University, Daejeon 34134, Republic of Korea
Interests: nanoelectrochemistry; energy storage and conversion device; biosensor; magnetoplasmonic; nanomaterials; photocatalysis
Dr. Njemuwa Njoku Nwaji

E-Mail Website
Guest Editor
Institute of Materials Chemistry, Department of Chemistry, Chungnam National University, Daejeon 34134, Republic of Korea
Interests: nanomaterial synthesis; energy storage and conversion; photophysics and photocatalysis; biomedicine

Special Issue Information

Dear Colleagues,

Recent decades have witnessed significant advances in nanotechnology and nanostructured-based materials for electrochemical energy conversion and storage, biosensors, and photocatalysis. These advancements have enabled innovative breakthroughs in many and varied fields, such as energy devices, clinical diagnosis, food analysis, and environmental monitoring. Thus, the scope of this Special Issue on “Nanotechnology for Electrochemistry Applications” is to provide a broad collection of the most recent research and review articles focusing on the synthesis of diverse nanostructured materials with potential applications within energy conversion and storage, biomedical sciences, and photocatalysis.

This Special Issue on “Nanotechnology for Electrochemistry Applications” aims to compile novel advances in nanotechnology in electrochemistry studies, with the primary emphasis  on the synthesis of nanomaterials and their electrochemical- or photoelectrochemical-based applications. Topics include but are not limited to:

  • Nano energy conversion and storage experiments and computational simulations;
  • An experimental and modeling study of renewable energy production;
  • Biosensors;
  • Electrochemistry;
  • Photoelectrochemistry.

Dr. Lemma Teshome Tufa
Dr. Njemuwa Njoku Nwaji
Guest Editors

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. Micromachines 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 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

  • nanomaterials
  • energy storage and conversion device
  • biosensors
  • photocatalysis

Published Papers (3 papers)

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Research

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13 pages, 3646 KiB  
Article
Electric-Field-Assisted Synthesis of Cu/MoS2 Nanostructures for Efficient Hydrogen Evolution Reaction
by Surra Yonas, Birhanu Bayissa Gicha, Samir Adhikari, Fedlu Kedir Sabir, Van Tan Tran, Njemuwa Nwaji, Bedasa Abdisa Gonfa and Lemma Teshome Tufa
Micromachines 2024, 15(4), 495; https://doi.org/10.3390/mi15040495 - 03 Apr 2024
Viewed by 587
Abstract
Molybdenum sulfide–oxide (MoS2, MS) emerges as the prime electrocatalyst candidate demonstrating hydrogen evolution reaction (HER) activity comparable to platinum (Pt). This study presents a facile electrochemical approach for fabricating a hybrid copper (Cu)/MoS2 (CMS) nanostructure thin-film electrocatalyst directly onto nickel [...] Read more.
Molybdenum sulfide–oxide (MoS2, MS) emerges as the prime electrocatalyst candidate demonstrating hydrogen evolution reaction (HER) activity comparable to platinum (Pt). This study presents a facile electrochemical approach for fabricating a hybrid copper (Cu)/MoS2 (CMS) nanostructure thin-film electrocatalyst directly onto nickel foam (NF) without a binder or template. The synthesized CMS nanostructures were characterized utilizing energy-dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM), X-ray diffraction (XRD), and electrochemical methods. The XRD result revealed that the Cu metal coating on MS results in the creation of an extremely crystalline CMS nanostructure with a well-defined interface. The hybrid nanostructures demonstrated higher hydrogen production, attributed to the synergistic interplay of morphology and electron distribution at the interface. The nanostructures displayed a significantly low overpotential of −149 mV at 10 mA cm−2 and a Tafel slope of 117 mV dec−1, indicating enhanced catalytic activity compared to pristine MoS2.This research underscores the significant enhancement of the HER performance and conductivity achieved by CMS, showcasing its potential applications in renewable energy. Full article
(This article belongs to the Special Issue Nanotechnology for Electrochemistry Applications)
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23 pages, 11153 KiB  
Article
One-Step Dry Coating of Hybrid ZnO–WO3 Nanosheet Photoanodes for Photoelectrochemical Water Splitting with Composition-Dependent Performance
by Muhammad Shehroze Malik, Deepto Roy, Doo-Man Chun and A. G. Abd-Elrahim
Micromachines 2023, 14(12), 2189; https://doi.org/10.3390/mi14122189 - 30 Nov 2023
Viewed by 857
Abstract
In this study, the potential of zinc oxide (ZnO), tungsten oxide (WO3), and their composites (ZnO–WO3) as photoanodes for photoelectrochemical (PEC) water splitting was investigated. ZnO–WO3 nanocomposites (NCs) were deposited on fluorine-doped tin oxide substrates at room temperature [...] Read more.
In this study, the potential of zinc oxide (ZnO), tungsten oxide (WO3), and their composites (ZnO–WO3) as photoanodes for photoelectrochemical (PEC) water splitting was investigated. ZnO–WO3 nanocomposites (NCs) were deposited on fluorine-doped tin oxide substrates at room temperature using a one-step dry coating process, the nanoparticle deposition system, with no post-processes. Different compositions of ZnO–WO3 NCs were optimized to enhance the kinetics of the PEC water-splitting reaction. Surface morphology analysis revealed the transformation of microsized particle nanosheets (NS) powder into nanosized particle nanosheets (NS) across all photoanodes. The optical characteristics of ZnO–WO3 photoanodes were scrutinized using diffuse reflectance and photoluminescence emission spectroscopy. Of all the hybrid photoanodes tested, the photoanode containing 10 wt.% WO3 exhibited the lowest bandgap of 3.20 eV and the lowest emission intensity, indicating an enhanced separation of photogenerated carriers and solar energy capture. The photoelectrochemical results showed a 10% increase in the photocurrent with increasing WO3 content in ZnO–WO3 NCs, which is attributed to improved charge transfer kinetics and carrier segregation. The maximum photocurrent for a NC, i.e., 10 wt.% WO3, was recorded at 0.133 mA·cm−2 at 1.23V vs. a reversible hydrogen electrode (RHE). The observed improvement in photocurrent was nearly 22 times higher than pure WO3 nanosheets and 7.3 times more than that of pure ZnO nanosheets, indicating the composition-dependence of PEC performance, where the synergy requirement strongly relies on utilizing the optimal ZnO–WO3 ratio in the hybrid NCs. Full article
(This article belongs to the Special Issue Nanotechnology for Electrochemistry Applications)
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Review

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19 pages, 1534 KiB  
Review
Exploring Copper Oxide and Copper Sulfide for Non-Enzymatic Glucose Sensors: Current Progress and Future Directions
by Nonkululeko Miya, Lerato F. Eugeni Machogo-Phao and Bulelwa Ntsendwana
Micromachines 2023, 14(10), 1849; https://doi.org/10.3390/mi14101849 - 27 Sep 2023
Viewed by 1250
Abstract
Millions of people worldwide are affected by diabetes, a chronic disease that continuously grows due to abnormal glucose concentration levels present in the blood. Monitoring blood glucose concentrations is therefore an essential diabetes indicator to aid in the management of the disease. Enzymatic [...] Read more.
Millions of people worldwide are affected by diabetes, a chronic disease that continuously grows due to abnormal glucose concentration levels present in the blood. Monitoring blood glucose concentrations is therefore an essential diabetes indicator to aid in the management of the disease. Enzymatic electrochemical glucose sensors presently account for the bulk of glucose sensors on the market. However, their disadvantages are that they are expensive and dependent on environmental conditions, hence affecting their performance and sensitivity. To meet the increasing demand, non-enzymatic glucose sensors based on chemically modified electrodes for the direct electrocatalytic oxidation of glucose are a good alternative to the costly enzymatic-based sensors currently on the market, and the research thereof continues to grow. Nanotechnology-based biosensors have been explored for their electronic and mechanical properties, resulting in enhanced biological signaling through the direct oxidation of glucose. Copper oxide and copper sulfide exhibit attractive attributes for sensor applications, due to their non-toxic nature, abundance, and unique properties. Thus, in this review, copper oxide and copper sulfide-based materials are evaluated based on their chemical structure, morphology, and fast electron mobility as suitable electrode materials for non-enzymatic glucose sensors. The review highlights the present challenges of non-enzymatic glucose sensors that have limited their deployment into the market. Full article
(This article belongs to the Special Issue Nanotechnology for Electrochemistry Applications)
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