Novel Electrode Materials for Electrochemical Applications

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Materials Processes".

Deadline for manuscript submissions: closed (25 November 2022) | Viewed by 9519

Special Issue Editors

School of Engineering, The University of Edinburgh, Edinburgh EH9 3FB, UK
Interests: electrochemistry; electrochemical engineering; electrocatalysis; photoelectrocatalysis; piezocatalysis; surface engineering; functional materials
Centre for Sustainable Materials Research and Technology (SMaRT), School of Materials Science and Engineering, University of New South Wales (UNSW), Sydney 2052, Australia
Interests: recycling of electronic waste (e-waste); energy storage and energy-harvesting nanomaterials; synthesis of nanomaterials and thin films; electrochemistry; renewable energies
Special Issues, Collections and Topics in MDPI journals
Department of Materials, University of Oxford, Oxford OX1 3PH, UK
Interests: designing and fabrication of the electrode materials such as anode and cathode, and solid-state electrolyte such as composite solid electrolytes for high energy density Li-ion batteries; the interfacial analysis between electrode and electrolyte to find out the battery degradation causes and failure mechanism; dynamic studies of the interface and interphases between the electrode and electrolyte in the lithium-ion batteries

Special Issue Information

Dear Colleagues,

After many years being overlooked by the wider research community, climate change and the rise of renewable energy have finally brought both recognition and attention to electrochemistry. Over the last 30 years, electrochemistry research has been on the rise due to its multidisciplinary nature and the broad range of applications that rely on it: from classic metal electroplating in manufacturing industries to batteries in portable electronic devices. This importance of electrochemistry in recent decades has driven forward the development of new electrode materials with enhanced electrocatalytic performance, as well as other improved properties (e.g. conductivity, chemical stability, robustness, etc.) that are critical to increase their lifespan.

This special issue on “Novel Electrode Materials for Electrochemical Applications” aims to gather outstanding researcher covering of all aspects related to electrode materials for electrochemical applications (from their fabrication and characterisation to their application in at large scale). This special issue will bring together high-quality research on this topic, focus on both state-of-the-art development as well as future prospects and challenges (e.g. sustainability of material, fabrication method and application). Applications include, but are not limited to:

  • Hydrogen economy: water electrolysis and fuel cells
  • Energy storage: batteries (including redox flow batteries) and capacitors
  • CO2 utilisation
  • Photoelectrocatalysis
  • Organic electrosynthesis
  • Electrochemical sensors
  • General electrolysis (e.g. chlor-alkali industry)
  • Water treatment

Dr. Ignacio Tudela-Montes
Dr. Rasoul Khayyam Nekouei
Dr. Pravin N. Didwal
Guest Editors

Manuscript Submission Information

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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

  • electrode materials
  • electrode fabrication
  • electrode processes
  • electrocatalysts
  • electrode support materials
  • electrocatalysis
  • electrochemical applications

Published Papers (4 papers)

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Research

15 pages, 2129 KiB  
Article
ARWLS-AFEKE: SOC Estimation and Capacity Correction of Lithium Batteries Based on a Fusion Algorithm
Processes 2023, 11(3), 800; https://doi.org/10.3390/pr11030800 - 07 Mar 2023
Cited by 3 | Viewed by 1012
Abstract
Accuracy of battery charge status (SOC) estimation plays a significant role in the management of electric vehicle power batteries. However, recently, abrupt changes from SOC data often occurs in the actual operation of electric vehicles and some errors appear in the establishment of [...] Read more.
Accuracy of battery charge status (SOC) estimation plays a significant role in the management of electric vehicle power batteries. However, recently, abrupt changes from SOC data often occurs in the actual operation of electric vehicles and some errors appear in the establishment of battery models and noise models, which give rise to the poorly adaptive and robust performance of traditional algorithms in the process of SOC estimation. The fusion algorithm proposed in this paper can effectively improve the accuracy of models and SOC estimation of lithium-ion batteries. Based on the second-order R-C network model, this method optimizes the accuracy of parameter identification by adopting the adaptive recursive weighted least square algorithm (ARWLS). In addition, the adaptive fading extended Kalman filter algorithm (AFEKF) is applied to estimate the SOC of lithium-ion batteries. Additionally, via introducing a fading factor, the optimal Kalman gain is updated in real-time, which can reduce the impact of data mutation on battery modeling. Compared with the offline AEKF algorithm and the EKF algorithm, the adaptive recursive weighted least square-adaptive fading extended Kalman filter (ARWLS-AFEKF) fusion algorithm had higher accuracy and adaptability, which can be adapted to the variable noise environment. Full article
(This article belongs to the Special Issue Novel Electrode Materials for Electrochemical Applications)
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17 pages, 7599 KiB  
Article
What Is the Optimal Method for Cleaning Screen-Printed Electrodes?
by , , , , , , , , and
Processes 2022, 10(4), 723; https://doi.org/10.3390/pr10040723 - 08 Apr 2022
Cited by 5 | Viewed by 4438
Abstract
Screen-printed electrodes-based sensors can be successfully used to determine all kinds of analytes with great precision and specificity. However, obtaining a high-quality sensor can be difficult due to factors such as lack of reproducibility, surface contamination or other manufacturing challenges. An important step [...] Read more.
Screen-printed electrodes-based sensors can be successfully used to determine all kinds of analytes with great precision and specificity. However, obtaining a high-quality sensor can be difficult due to factors such as lack of reproducibility, surface contamination or other manufacturing challenges. An important step in ensuring reproducible results is the cleaning step. The aim of the current work is to help researchers around the world who struggle with finding the most suitable method for cleaning screen-printed electrodes. We evaluated the cleaning efficiency of different chemical compounds and cleaning methods using cyclic voltammetry and electrochemical impedance spectroscopy. The percentage differences in polarization resistance (Rp) before and after cleaning were as follows: acetone—35.33% for gold and 49.94 for platinum; ethanol—44.50% for gold and 81.68% for platinum; H2O2—47.34% for gold and 92.78% for platinum; electrochemical method—3.70% for gold and 67.96% for platinum. Thus, we concluded that all the evaluated cleaning methods seem to improve the surface of both gold and platinum electrodes; however, the most important reduction in the polarization resistance (Rp) was obtained after treating them with a solution of H2O2 and multiple CV cycles with a low scanning speed (10 mV/s). Full article
(This article belongs to the Special Issue Novel Electrode Materials for Electrochemical Applications)
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14 pages, 4483 KiB  
Article
Autogenous Oxidation/Reduction of Polyaniline in Aqueous Sulfuric Acid
Processes 2022, 10(3), 443; https://doi.org/10.3390/pr10030443 - 22 Feb 2022
Viewed by 1524
Abstract
In this work, we have shown through open circuit potential experiments that in aqueous sulfuric acid solutions, a thick polyaniline film undergoes autogenous oxidation when reduced below a threshold potential and autogenous reduction when oxidized above the threshold potential. This phenomenon is associated [...] Read more.
In this work, we have shown through open circuit potential experiments that in aqueous sulfuric acid solutions, a thick polyaniline film undergoes autogenous oxidation when reduced below a threshold potential and autogenous reduction when oxidized above the threshold potential. This phenomenon is associated with the high resonance stability of polarons in long polyaniline chains present in thicker films. We have determined the rates of these reactions using a linear sweep chronopotentiometry technique. We propose that the oxidation reaction of polyaniline produces polarons with a concomitant reduction of hydrogen ions to hydrogen radicals, which further combine with each other to produce the hydrogen molecule in the absence of dissolved oxygen. On the other hand, at high potentials polarons are reduced with the concomitant oxidation of water to hydroxyl radicals. Both the radicals are stabilized due to the interaction of their unpaired electrons with pi-electrons of the aromatic rings of the polymer backbone. At the equilibrium value of the open circuit potential, both the hydrogen radicals and hydroxyl radicals are generated at equal rates and react with each other to form water. Full article
(This article belongs to the Special Issue Novel Electrode Materials for Electrochemical Applications)
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16 pages, 2504 KiB  
Article
Investigation of Effects of Copper, Zinc, and Strontium Doping on Electrochemical Properties of Titania Nanotube Arrays for Neural Interface Applications
Processes 2021, 9(12), 2099; https://doi.org/10.3390/pr9122099 - 23 Nov 2021
Cited by 1 | Viewed by 1493
Abstract
Direct interaction with the neuronal cells is a prerequisite to deciphering useful information in understanding the underlying causes of diseases and functional abnormalities in the brain. Precisely fabricated nanoelectrodes provide the capability to interact with the brain in its natural habitat without compromising [...] Read more.
Direct interaction with the neuronal cells is a prerequisite to deciphering useful information in understanding the underlying causes of diseases and functional abnormalities in the brain. Precisely fabricated nanoelectrodes provide the capability to interact with the brain in its natural habitat without compromising its functional integrity. Yet, challenges exist in terms of the high cost and complexity of fabrication as well as poor control over the chemical composition and geometries at the nanoscale, all imposed by inherent limitations of current micro/nanofabrication techniques. In this work, we report on electrochemical fabrication and optimization of vertically oriented TiO2 nanotube arrays as nanoelectrodes for neural interface application. The effects of zinc, strontium, and copper doping on the structural, electrochemical, and biocompatibility properties of electrochemically anodized TiO2 nanotube arrays were investigated. It was found that doping can alter the geometric features, i.e., the length, diameter, and wall thickness, of the nanotubes. Among pure and doped samples, the 0.02 M copper-doped TiO2 nanotubes exhibited superior electrochemical properties, with the highest specific storage capacitance of 130 F g−1 and the lowest impedance of 0.295 KΩ. In addition, regeneration of Vero cells and neurons was highly promoted on (0.02 M) Cu-doped TiO2 nanotube arrays, with relatively small tube diameters and more hydrophilicity, compared with the other two types of dopants. Our results suggest that in situ doping is a promising method for the optimization of various structural and compositional properties of electrochemically anodized nanotube arrays and improvement of their functionality as a potential nanoelectrode platform for neural interfacing. Full article
(This article belongs to the Special Issue Novel Electrode Materials for Electrochemical Applications)
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