فهرست مطالب

Analytical & Bioanalytical Electrochemistry - Volume:16 Issue: 5, May 2024

Analytical & Bioanalytical Electrochemistry
Volume:16 Issue: 5, May 2024

  • تاریخ انتشار: 1403/03/11
  • تعداد عناوین: 6
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  • Megersa Gudisa Gudisa, Ebisa Mirete Deresa, Gebru Gebretsadik, Guta Gonfa, Shimeles Addisu Kitte * Pages 389-404
    In this work, CuO nanoparticles (NPs), ZnO NPs, and CuO-ZnO nanocomposites (NCs) were synthesized using Citrus sinensis fruit peel extract. Then, carbon paste electrodes modified with each nanomaterial (CuO-CPE, ZnO-CPE, and CuO-ZnO-CPE) was fabricated for the electrochemical detection of hydrogen peroxide (H2O2). The prepared metal oxide nanomaterials were characterized using Ultraviolet-Visible (UV-Vis) spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), and scanning electron microscopy (SEM). The average crystallite sizes for nanomaterials composed of CuO and ZnO NPs and CuO-ZnO NCs were 32.2 nm, 31.7 nm, and 35.38 nm, respectively. A carbon paste electrode modified with CuO-ZnO NCs (CuO-ZnO-CPE) was used to detect H2O2. At CuO-ZnO-CPE, a cathodic peak for H2O2 was seen at about 0.0 V. Under optimum experimental conditions, the developed electrode showed a wide linear range from 0.5 μM to 200.0 μM with a limit of detection (LOD) of about 0.32 μM. The synthesized electrode also showed increased stability, adequate selectivity, and repeatability.
    Keywords: Citrus Sinensis, Cuo Nanoparticles, Zno Nanoparticles, Cuo-Zno Nanocomposite, Electrochemical Detection, Hydrogen Peroxide
  • Mahdie Azizi, Ali Babaei *, Akbar Yousefi Pages 405-422
    The present work reports a novel green synthesis of CuO nanoparticles (CuONPs) exerting an extract of the Hymenocrater Platystegius plant as a mild and non-toxic stabilizing agent. In order to obtain its applicability, a carbon paste electrode (CPE) was modified with the CuONPs and graphene oxide (GO) (CuONPs/GO/CPE) for trace determination of histamine (HIS) and uric acid (UA). The electrochemical investigations on HIS and UA were accomplished by the application of differential pulse voltammetry (DPV), cyclic voltammetry (CV), and chronoamprometry (CA) methods. The results showed the modified electrode expedites the electron transfer reactions of HIS and UA. The modified electrode exhibited some advantages such as good stability, convenient preparation, and high sensitivity toward HIS and UA determination. Under the optimum conditions, the electrode provides a linear response versus HIS and UA concentrations in the range of 1-300 and 0.5-500 µM, with a detection limit of 0.94 µM and 0.25 µM (S/N=3), respectively. The electrochemical results recommended that the CuONPs/GO/CPE is a promising sensor to determine HIS and UA in real samples with a significant recovery.
    Keywords: Green Synthesized Copper Oxide Nanoparticles, Histamine, Uric Acid, Graphene Oxide, Modified Carbon Paste Electrode
  • Tahere Mollaei, Ahmad Rouhollahi *, Mojtaba Hadi, Fatemeh Rasouli Pages 423-437
    The ZnO nanorods, ZnO nanotubes, and Cu-doped ZnO nanotube photoanodes were electro-synthesized to improve the photoelectrochemical water-splitting performance. The structural, optical, morphologic, and photoelectrocatalytic properties of the prepared samples were investigated. UV-visible results show Cu-doped ZnO nanotube photoanode extends the visible light absorption and reduces the band gap. Mott-Schottky analysis displays that the Cu-doped ZnO nanotube sample has higher electron density than other samples. Nyquist plots indicate that Cu doping reduces the charge transfer resistance and improves charge transfer. By comparing the LSV voltammograms, it was found that Cu-doped ZnO nanotube photoelectrode has a maximum photocurrent density of 78.3 µA/cm2 at 1.6 V vs. RHE. While the value of photocurrent density obtained for pure ZnO nanorods sample is 9.6µA/cm2 at 1.6 V vs. RHE. Due to the role of Cu in reducing the band gap and reducing the charge recombination rate, Cu doping enhances the photoelectrochemical efficiency of the ZnO nanotube.
    Keywords: Band Gap, Cu Doping, Zno Nanotubes, Water Splitting, Photoanode
  • Hamed Pourfarzad *, Mohammad Peirow Asfia Pages 438-458
    The evaluation of the Aluminum alloy 1050 as an anode in an Al/AgO battery in an aerated 6.0 M KOH solution involves studying its corrosion behavior and battery performance. Various techniques, including potentiodynamic polarization, electrochemical impedance spectroscopy, electrochemical noise analysis, field-emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, and galvanostatic discharge, are employed to assess these aspects. The polarization results reveal that the addition of various concentrations of thiourea to ZnO as the best-mixed inhibitor reduces the corrosion rate of aluminum during the initial stages from 4638.9 mpy to 1634.6 mpy. Also, this type of inhibitor leads to an increase in polarization resistance from 3.10 Ω.cm2 to 8.36 Ω.cm2, which are in good agreement with the results of impedance spectroscopy studies. Furthermore, based on the findings of EIS studies this type of inhibitor with an inhibition efficiency of more than 90.47%, facilitates the formation of a protective layer on the surface, effectively controlling the initiation and propagation of pits. As the immersion time increases, the inhibitor creates conditions where the aluminum anode corrodes uniformly, providing the necessary electrons and capacity for the battery to perform better. The SEM results also demonstrate that the corrosion of aluminum becomes more uniform, resulting in an impressive anode efficiency of 90.19% in the galvanostatic discharge test.
    Keywords: Citrus Sinensis, Cuo Nanoparticles, Zno Nanoparticles, Cuo-Zno Nanocomposite, Electrochemical Detection, Hydrogen Peroxide
  • Dedy Firmansyah * Pages 459-472

    Supercapacitors, also known as electric double-layer capacitors, have gained substantial attention for their remarkable energy storage capabilities, making them vital for numerous applications, including portable electronics, electric vehicles, and renewable energy systems. This review delves into the intricate world of carbon electrodes in supercapacitors, highlighting the diverse carbon materials used, such as activated carbons, carbon blacks, zeolite-template carbons, and graphene meso-sponges, and their significant impact on supercapacitor performance. Some research explores the synthesis of carbon electrodes using zeolite templates, which provide precise control over structural properties for enhancing performance in high-rate applications. The review also provides a comprehensive understanding of the fundamental principles of electrochemical cells, emphasizing the critical factors affecting carbon electrode performance, including surface functional groups, electrolyte composition, voltage range and stability, cycle life, operating temperature, current density, and rate capability. Recognizing the interconnected nature of these factors is essential for optimizing supercapacitor technology. This knowledge forms the foundation for ongoing research and innovation needed to advance supercapacitors, providing sustainable and efficient solutions to pressing energy challenges.

    Keywords: Capacitance, Electrochemical Cell, Electrolyte, Energy Storage, Functional Group
  • Rushan Mansuri, Falguni Hirpara, Kiran Dudhat * Pages 473-506

    A significant metabolic illness known as diabetes mellitus is characterized by a lack of insulin or the pancreas failure to produce enough insulin. The blood glucose levels rise as a result of this condition in the human body. Nowadays management of diabetes is very easy by using various technologies such as biosensors. These types of devices are mainly used in the medical field for the advancement in cure and management of disease or disorder accurately.The main aim of advanced diabetes technology is to treat or control diabetes properly by using continuous glucose monitoring devices (CGM), insulin pens, insulin pumps, smartwatches, and some mobile applications. Above mention devices continuously give information to patients by Bluetooth in the patient’s smartphone or smartwatch and according to data patients have control blood glucose levels and manage diabetes mellitus. While these technologies have demonstrated improvement in health outcomes. For achieving rational control over elevated blood glucose levels, frequent monitoring with invasive blood glucose monitoring techniques is mandatory for diabetic patients. We can easily manage blood glucose levels by using various diabetes technologies. The development of noninvasive glucose biosensor methods will be painless and reduce the complexity of invasive techniques. The main challenge of the biosensor is to recognize biological signals and these signals are transduced into electrical signals after being detected by specified detectors which are made up of semiconductors.

    Keywords: Biosensors, Diabetes Mellitus, Glucose Monitoring Devices, Insulin Pump Technology, Telehealth