Electroanalysis最新文献

LiFePO₄ is very promising for application in the field of power batteries due to its high specific capacity (170 mAh⁻¹), stable structure, safety, low price, and environmental friendliness. However, it is well known that the slow electron transport and Li⁺ transport of LiFePO₄ results in a rate performance that is far below the requirements for small batteries, resulting in a low LiFePO₄ energy density. In order to solve this problem, LiMn_1−xFe_xPO₄ (LMFP) cathode material was synthesized by combining Fe and Mn in a certain ratio, and its material properties were improved. Here, we provide a detailed review of LiMn_1−xFe_xPO₄ anode material preparation. In addition, this review focuses on the preparation of LiMn_1−xFe_xPO₄ and several modification methods to compensate for the inherent deficiencies of certain materials, as well as predicting their future trends.

Microbial Fuel Cells (MFCs) represent an innovative approach for transforming biomass energy directly into electricity, which showed great promise in various applications beyond energy generation and wastewater treatment. The use of MFCs as biosensors for in-situ and online monitoring has garnered increasing interest. These biosensors stand out for their compactness, ease of operation, affordability, and portability. They have proven effectively in the detection of various water quality indicators, including organic matter, nitrogen, heavy metals, pH levels, and dissolved oxygen. This comprehensive review aims to provide a critical analysis of the current research landscape and the latest advancements in MFC technology, with special emphasis on the challenges encountered in its application for wastewater and water quality monitoring. Moreover, strategies for performance improvement, such as the adoption of miniaturized structures, the exploration of innovative materials, and the application of mathematical modelling for analysis, are also discussed. The review also explores potential avenues for future research, especially in the realm of detecting mixed pollutants. Thus, it provides insightful perspectives on the evolving field of biosensor technology based on MFCs.

In this study, a labeled electrochemical immunosensor was developed to determine gliadin protein. Herein, the glassy carbon electrode (GCE) surface was modified by the graphene oxide (GO) dispersion followed by electrochemical deposition of silver nanoparticles (AgNPs). Anti-gliadin antibody (Gli-Ab1) was immobilized on this electrode (GCE/GO/AgNPs); subsequently, this platform was incubated with bovine serum albumin (BSA) to prevent non-specific interactions. Gliadin antigen (Gli) followed by horseradish peroxidase-labeled secondary antibody (HRP−Ab2) solutions were added to the GCE/GO/AgNPs/Gli-Ab1/BSA immunosensor surface. Scanning Electron Microscope (SEM) was utilized to investigate the surface properties of the prepared electrodes, and cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and differential pulse voltammetry (DPV) techniques were utilized to investigate their electrochemical properties. The experimental conditions have been optimized to form the appropriate immunosensor structure. The gliadin antigen was determined using DPV after the HRP enzyme substrates (hydroquinone and hydrogen peroxide) were added to the electrochemical cell. The gliadin protein′s linear working range was 0.5–200 μg mL⁻¹. The subjected immunosensor displayed convenient reproducibility and selectivity to the possible interfering substances.

This study introduces a novel photoelectrochemical (PEC) sensor for the highly selective detection of sulfur dioxide (SO₂) using an organic photoactive molecule probe (OPM). OPM is synthesized through a one-step coupling reaction, featuring a typical photosensitizer D-π-A structure. By covalently bonding OPM with a TiO₂ substrate, a PEC sensor is constructed, exhibiting a significant photocurrent response under visible light excitation. The specific addition reaction between SO₂ and OPM disrupts its conjugated structure, reducing the photocurrent response and achieving highly selective detection of SO₂. The sensor demonstrates excellent performance in real water samples, emphasizing its practical applications.

Sunset yellow, a synthetic colorant and used to improve the texture and the appearance of food samples, can adversely affect humans. The development of a sensitive method to analyse food products for the accurate determination of sunset yellow is of importance for the level of risk to human health and thus food safety. The present study aimed to prepare a voltammetric method for the precise detection of sunset yellow content in a commonly consumed powdered beverage and pharmaceutical products. For this purpose, a sensitive method utilizing a voltammetric platform was constructed by modifying a glassy carbon electrode (GCE) with carbon nanotubes (MWCNTs) and aluminium doped zinc oxide (AZO). Cyclic voltammetry (CV) and electrochemical impedance spectroscopic (EIS) measurements indicated that the proposed voltammetric platform (GCE/MWCNTs/AZO) possessed high electro-active surface area and lower value of charge transfer resistance (Rct) and therefore, could serve as a promising sensing material. The GCE/MWCNTs/AZO system improved voltammetric behaviour of sunset yellow at an accumulation time of 210 s and indicated good electrocatalytic activity due to high synergistic effect between MWCNTs and AZO nanoparticles. This method of analysis exhibited a dynamic working range from 4.0×10⁻⁹ to 7.5×10⁻⁶ M with a limit of detection (LOD) of 9.5×10⁻¹⁰ M for sunset yellow. The GCE/MWCNTs/AZO system was successfully utilized for the electroanalysis of beverages and pharmaceuticals for detection of sunset yellow. Voltammetric measurements indicate that the GCE/MWCNTs/AZO system enables good accuracy and high precision for the determination of sunset yellow.

Cover picture provided by Dr. Elena Benito-Peña and Dr. Susana Campuzano. Electroanalysis covers all branches of electroanalytical chemistry, including both fundamental and application papers as well as reviews dealing with analytical voltammetry, potentiometry, new electrochemical sensors and detection schemes, nanoscale electrochemistry, advanced electromaterials, nanobioelectronics, point-of-care diagnostics, wearable sensors, and practical applications.