Article
Chemistry, Analytical
Samuel Frutos-Puerto, Conrado Miro, Eduardo Pinilla-Gil
Summary: The methodology utilizes passive sampling of gaseous elemental mercury on screen-printed gold electrodes, followed by the measurement of amalgamated mercury. Through detailed exploration of the electrode surface behavior, signal stability, and inter-electrode reproducibility, acceptable results were obtained. The study also demonstrated good correlation coefficients between two GEM calibration protocols within a certain concentration range.
ANALYTICAL CHEMISTRY
(2021)
Article
Electrochemistry
William B. Veloso, Thiago R. L. C. Paixao, Gabriel N. Meloni
Summary: The limitations in the voltammetric response of 3D printed electrodes are studied using numerical simulations and new electrode designs. Severe diffusion limitations are found in a commonly used 3D printed electrode and electrochemical cell design, hindering the investigation of electron transfer kinetics. A new non-recessed electrode design is used to study the voltammetric response without mass transport limitations, revealing that the response is limited by contact resistance. By considering contact resistance and finite electron transfer kinetics, the peak potentials and currents of voltammograms recorded with 3D printed electrodes can be predicted before printing, allowing for optimized electrode designs in the virtual space.
ELECTROCHIMICA ACTA
(2023)
Article
Chemistry, Analytical
Elena Alberto, Julio Bastos-Arrieta, Clara Perez-Rafols, Nuria Serrano, M. Silvia Diaz-Cruz, Jose Manuel Diaz-Cruz
Summary: A DPV method using SPCEs was developed for the determination of SMX, showing a good detection limit (15 μg/L) and a wide linear range (50-600 μg/L) with good repeatability and reproducibility. The method was successfully applied to the analysis of a spiked tap water sample, demonstrating high reproducibility and good trueness. Additional considerations were made on the pH-dependent electrochemical oxidation of SMX and the role of the free terminal amino group in oxidation.
MICROCHEMICAL JOURNAL
(2023)
Article
Chemistry, Analytical
Colm McKeever, Sarah Callan, Susan Warren, Eithne Dempsey
Summary: This study focused on advancing electrochemical devices for analyzing forensically relevant residues using rapid electrochemical sensor technology. The electrochemical detection of propellant stabilizer DPA was achieved through voltammetry, with signal enhancement from iron oxide nanoparticle modification. These innovative methods aimed to improve the selectivity and sensitivity of reliable detection.
Article
Chemistry, Analytical
Hilal Torul, Ece Yarali, Ece Eksin, Abhijit Ganguly, John Benson, Ugur Tamer, Pagona Papakonstantinou, Arzum Erdem
Summary: Paper-based electrochemical biosensors were developed for rapid and sensitive detection of microRNAs related to early diagnosis of lung cancer. The biosensors showed high selectivity and sensitivity for target miRNAs in the presence of mismatched or noncomplementary sequences.
Article
Electrochemistry
Mohamed M. Elnagar, Ludwig A. Kibler, Timo Jacob
Summary: The cathodic corrosion of Au wires in highly concentrated NaOH was studied to investigate the structural transformation as a function of applied electrode potential, polarization time, and electrolyte concentration. The study revealed that polarizing the Au surfaces at negative potentials leads to the growth of nanosized octahedral and triangular crystallites that can be controlled by varying NaOH concentrations. The initial stages of cathodic corrosion were dominated by Au dissolution, and the number of nanocrystals increased with more negative potentials. This research not only advances our understanding of nanocrystal formation but also provides a method for controlling the shape and size of metal nanocrystals through rational design of cathodic corrosion.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Review
Electrochemistry
Gul S. Ustabasi, Mustafa Ozcan, Ismail Yilmaz
Summary: Determining heavy metals remains important due to contamination and industrial activities. Spectrometric methods are accurate but costly and time-consuming. Recent advancements in electrochemistry, especially voltammetric methods, have made trace-level heavy metal analysis easier, faster, and cheaper. Carbon-based electrodes, like the four most common ones examined in this review, show promise in improving performance for heavy metal determination.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Chemistry, Analytical
Szymon Wojcik, Filip Ciepiela, Boguslaw Bas, Malgorzata Jakubowska
Summary: The work introduces innovative quadruple disk voltammetric electrodes made of iridium, platinum, and iridium-platinum, which are specifically designed for analyzing samples with complex organic compositions. The electrodes utilize noble metal wires tightly wrapped in a silver rod, allowing each wire to function as an individual sensor. By combining the electrode responses from the different metals, the iridium-platinum sensor can expand its application range and be used as an electronic tongue. Experimental results demonstrate the successful profiling of seasonal variations in honey samples collected from a beekeeping facility in Poland using these single and combined noble metal electrodes. By employing differential pulse voltammetry without any reagents, the obtained data were analyzed using principal component analysis and an optimized variable selection procedure. The best classification results for the 12 honeys were achieved using a multimetallic electrode. A deep convolutional neural network model achieved 100% accuracy in correctly classifying the honeys in the training and validation sets. This study highlights the potential of quadruple disk noble metal electrodes as a valuable tool for voltammetric profiling and suggests that the strategy involving deep learning can be further developed.
Article
Chemistry, Analytical
Ivet Jimenez, Clara Perez-Rafols, Nuria Serrano, Manel del Valle, Jose Manuel Diaz-Cuzc
Summary: A voltammetric sensor based on the modification of a screen-printed carbon electrode with reduced graphene oxide (rGO-SPCE) was developed for the determination of capsaicin. The sensor showed improved sensitivity and repeatability compared to other modified electrodes. It achieved a low limit of detection and provided accurate results for the determination of capsaicin in various samples.
MICROCHEMICAL JOURNAL
(2023)
Review
Chemistry, Physical
Kamonwad Ngamchuea
Summary: Copper is an important electrocatalyst used in various applications, and understanding its electrochemical behavior is crucial for optimizing its catalytic performance. However, the interpretation of electrochemical reactions at copper electrodes is challenging due to the inconsistency of experimental results. This review emphasizes the significance of investigating the voltammetry of copper electrodes and summarizes the factors that influence the observed voltammetric peaks.
CURRENT OPINION IN ELECTROCHEMISTRY
(2023)
Article
Chemistry, Analytical
Paula Clares, Clara Perez-Rafols, Nuria Serrano, Jose Manuel Diaz-Cruz
Summary: In this work, a simple, fast, sensitive, and low-cost method using a screen-printed carbon electrode (SPCE) was developed for the simultaneous determination of AA, PA, DX, and CF in both pharmaceutical formulations and environmental samples. The method exhibited linear dependence between the oxidative peak current and concentration, with low detection limits and good recoveries.
Article
Materials Science, Multidisciplinary
V. S. Haritha, Athira Vijayan, S. R. Sarath Kumar, R. B. Rakhi
Summary: The facile synthesis of MoS2 microspheres and the construction of MoS2/glassy carbon electrodes for precise detection of hydrogen peroxide were reported. The MoS2-modified GCE displayed superior electrocatalytic reduction of H2O2 due to its high surface area and good electrical conductivity. The MoS2/GCE sensor exhibited high sensitivity, linearity in detection, and low detection and quantification limits.
Article
Chemistry, Multidisciplinary
E. I. Maksyutova, A. V. Sidelnikov, A. G. Mustafin, E. V. Govorov
Summary: Electrochemical methods of analysis are increasingly being used in various industries to improve product quality. This study focuses on sugar and sugar color, proposing a method to differentiate sugars and colors from different manufacturers. This method can be applied in the food industry for rapid analysis of the origin of sugar and other soluble products.
NEW JOURNAL OF CHEMISTRY
(2021)
Review
Chemistry, Analytical
Shashanka Rajendrachari, Nagaraj Basavegowda, Vinayak M. Adimule, Baris Avar, Prathap Somu, Saravana R. M. Kumar, Kwang-Hyun Baek
Summary: The global financial loss and health effects caused by food quality adulteration and contamination have become a major concern, leading to the urgent need for developing reliable methods to determine food quality. In recent years, electrochemical methods, particularly voltammetric methods using carbon-based electrodes, have gained popularity due to their simplicity, ease of use, specificity, and sensitivity in detecting common food contaminants such as pesticides, additives, and animal drug residues. This review article discusses the electrochemical detection of food contaminants using different carbon nanomaterials and highlights the advantages of carbon-based electrodes in sensing food contaminants.
Article
Engineering, Chemical
Iulia Gabriela David, Mihaela Buleandra, Dana Elena Popa, Mihaela Carmen Cheregi, Vasile David, Emilia Elena Iorgulescu, Georgiana Oana Tartareanu
Summary: With the ever-growing production of pharmaceutical compounds, there is a need for facile and reliable analysis methods. Electrochemical techniques are among the simplest and fastest instrumental techniques with good performance characteristics. The pencil graphite electrode (PGE) has gained increasing interest in recent years due to its inherent electrochemical and economic advantages. This paper reviews scientific reports published in the last 10 years on the electroanalysis of pharmaceutical compounds using disposable eco- and user-friendly PGEs in different matrices, discussing their characteristics, designs, applications, and performance parameters, emphasizing their advantages and limitations.