The illicit stimulant, β‐keto‐ethylbenzodioxolylbutanamine (βk‐EBDB), has seen widespread abuse in recent years, spurring the need for new on‐site screening tools for accurate and timely identification in forensic investigations. This study sought to develop and evaluate an electrochemical sensing method on screen‐printed carbon electrodes (SPCEs) for the determination of this drug in simulated case samples, human oral fluid and human urine. Analysis was performed under optimised differential pulse voltammetry (DPV) for solid drug material dissolved in 0.10 M borate buffer saline (BBS) at pH 10.0 as the supporting electrolyte. Adsorptive stripping differential pulse voltammetry (AdSDPV) was employed for detection in biological fluids diluted in the same buffer system. βk‐EBDB was profiled in under 4 min with an estimated limit of detection/quantification (LOD/LOQ) of 10 µM and a linear response within the following concentration ranges: 10–100 µM in supporting electrolyte, 10–60 µM in oral fluid and 10–35 µM in urine. Electrochemical signals demonstrated good repeatability in peak potential both within a single day (intraday) and across multiple days (interday), with relative standard deviations for both methods remaining below 1.51% ( N = 36). During the same experiments, peak current relative standard deviations were consistently higher, reaching 24.1% ( N = 36) in some instances. Strong selectivity for βk‐EBDB was observed even in the presence of commonly encountered illicit drugs and cutting agents. This suggests the method's potential for integration into a rapid and cost‐effective drug testing device for forensic science applications.

Herein, Fe 3 O 4 magnetic nanoparticles (Fe 3 O 4 MNPs) were synthesized via a one‐step counter‐coprecipitation method, and Prussian blue (PB) nanoparticles were subsequently modified in situ on the surface of Fe 3 O 4 MNPs. The obtained PB/Fe 3 O 4 composite magnetic nanoparticles were characterized by transmission electron microscopy, Fourier transform infrared spectroscopy, X‐ray diffraction, and X‐ray photoelectron spectroscopy. The results demonstrated that PB/Fe 3 O 4 exhibited excellent peroxidase‐like catalytic activity and followed Michaelis–Menten kinetics in the presence of H 2 O 2 and 3,3′,5,5′‐tetramethylbenzidine. Taking advantage of the intrinsic peroxidase‐like activity of PB, Fe 3 O 4 MNPs, and their synergistic effects, a novel nitrite (NO 2 − ) signal‐enhanced electrochemical sensing platform was developed by first modifying a magnetic glassy carbon electrode (MGCE) with PB and then drop‐casting the PB/ Fe 3 O 4 composite nanoparticles. The resulting PB/ Fe 3 O 4 /PB/MGCE sensor exhibited high sensitivity and selectivity toward NO 2 − detection. Under optimized conditions, the sensor achieved a detection limit of 0.03588 μM (S/N = 3). Furthermore, the proposed peroxidase‐like signal‐enhanced electrochemical sensor was successfully applied to detect NO 2 − in sausage, bacon, and pickled mustard tuber samples. Overall, this novel signal‐enhanced electrochemical sensing strategy offers great potential for applications in food quality control and safety monitoring.

In this study, a bimetallic metal‐organic framework material (ZnNi MOFs) was synthesized via the solvothermal method, which was then calcined at high temperatures to produce a nickel‐doped carbon nanotube material.Scanning Electron Microscope (SEM), X‐ray diffractometer, X‐ray Photoelectron Spectroscopy (XPS), Fourier Transform Infrared Spectroscopy (FT‐IR), and electrochemical techniques were used to characterize the composition, structural characteristics, and performance of the material. Experiments show that the sensor based this proposed material exhibits good electrocatalytic activities to the oxidation of ascorbic acid (AA) and dopamine (DA) and can be employed to simultaneously detect them. Under the optimal conditions, the oxidation currents of AA and DA exhibit a marked linear relationship with their respective concentrations within the domain of 500.00–9500.00 and 0.50–150.00 μM, respectively. The detection limits were 20.18 and 0.04 μM, respectively. And the sensor was effectively used to detect AA and DA in urine sample simultaneously. The sensor possesses excellent stability, reproducibility, resistance to interference, and broader linear ranges with potential applications.

The electrochemical performance of lithium metal batteries hinges on interfacial desolvation and ion transport kinetics, particularly in low‐temperature environments. Herein, we design a fluorinated carboxylate electrolyte that facilitates desolvation and promotes the formation of interfacial films for low‐temperature lithium metal batteries. By employing lithium bis(fluorosulfonyl)imide (LiFSI) as the lithium salt and using methyl trifluoroacetate (MTFA) and fluoroethylene carbonate (FEC) as solvents, an MTFA‐FEC fluorinated carboxylate‐based electrolyte is formulated. MTFA effectively reduces the freezing point of the electrolyte, while FEC enhances the dissociation of LiFSI and improves the film‐forming ability of the electrolyte. The relatively weak binding force between Li + and MTFA is conducive to the desolvation process. By adjusting the ratio of MTFA and FEC solvents, we effectively enhance the stability of the electrode–electrolyte interface. The results demonstrate that when the volume ratio of MTFA to FEC is 8:2, the Li||Cu cell using this electrolyte can stably cycle for 80 cycles at 0°C. At −20°C, the Li||LFP cell can stably cycle for 200 cycles at 0.2 C, with an initial discharge specific capacity of 100.2 mAh g −1 . Notably, even at 1 C, the discharge specific capacity remains at 53.0 mAh g −1 .

Rapid and reliable detection of Escherichia coli ( E. coli ) in water is critical for safeguarding public health. We developed a dual‐mode biosensor that integrates p‐benzoquinone (BQ)‐mediated colorimetric prescreening with antibody‐based electrochemical quantification using screen‐printed gold electrodes (SPGEs). BQ serves a dual role by generating a visible color change through its enzymatic reduction by viable E. coli and by participating in a reversible redox cycle that enhances faradaic response during electrochemical analysis. The biosensing platform was validated using E. coli ATCC 25922 together with broad‐serotype polyclonal anti‐ E. coli O/K antibodies, which enable species‐level recognition. Under optimized conditions (6.0 mM BQ, 25 µg/mL antibody), the sensor achieved a wide linear range from 10 1 to 10 9 CFU/mL with a detection limit of 0.57 CFU/mL. Repeatability was excellent (1.51% RSD), and specificity tests demonstrated clear discrimination between viable E. coli , nontarget bacteria ( S. aureus ), and nonviable cells. This dual‐selectivity strategy, combining metabolic activity with molecular recognition, offers a rapid and portable approach for on‐site microbial water quality monitoring.

Xanthine (XAN), a key indicator of food spoilage and purine metabolism, is crucial for clinical diagnostics and food safety monitoring. In the present research, an enzyme‐free electrochemical biosensor has been developed using bacterial nanowires (BNWs) from Pseudomonas aeruginosa assembled onto glassy carbon electrodes (GCE). Characterization using UV–Visible spectroscopy (UV–vis), scanning electron microscope (SEM), and Fourier transform infrared spectroscopy (FTIR) confirmed that the nanowires possess a high surface area and contain redox‐active components. Electrochemical studies, involving cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), differential pulse voltammetry (DPV), demonstrated that BNW‐modified GCE enables sensitive or selective detection of XAN. Sensor exhibited linear detection range for XAN from 0.01 to 1 µM, with correlation coefficient ( R 2 ) of 0.9972 and sensitivity of 1.87 µA µM −1 . Limit of detection (LOD) has been determined as 1.9 nM, and limit of quantification (LOQ) has been 6.2 nM. Biosensor demonstrated excellent selectivity, showing negligible interference from ascorbic acid (AA), histamine (HIS), uric acid (UA), L‐histidine(L‐HIS), with only minor cross‐reactivity to hypoxanthine (HX). Fabrication reproducibility was high, with an relative standard deviation (RSD) below 2%, and stability has been maintained above 95% after repeated use. Real sample analysis in fish muscle extracts yielded recovery rates from 98.0% to 102.3%, confirming accuracy and minimal matrix effects. These results establish BNW‐modified GCE as effective, reliable platform for trace‐level XAN detection in complex samples.

High‐nickel cathodes attract increasing attention owing to their high specific capacity, yet exhibit structural instability and inferior cycling performance. Surface coating is an effective strategy to enhance their electrochemical behavior. This study introduces a nitrogen‐doped zirconia‐carbon composite (NC@ZrO 2 ) as a coating for LiNi 0.8 Mn 0.1 Co 0.1 O 2 (NCM811), with the composite prepared using the metal–organic framework material UiO‐66‐NH 2 as a precursor. As a coating layer, NC@ZrO 2 prevents direct contact between cathode and electrolyte to suppress side reactions and reduce interfacial resistance. Its porous structure facilitates lithium‐ion diffusion. Consequently, the modified NCM811 presents remarkable rate capability and cycling stability. The 10 wt% coated NCM811 cathode demonstrates 78.3% capacity retention at 5 C, exceeding that of the unmodified NCM811 by 36.4%. After 500 cycles at 1 C, the modified material retains 82.4% capacity retention. This work presents a promising approach for optimizing high‐nickel cathode materials using MOF‐based composites.

Considering the environmental and health issues caused by glyphosate, a controversial nonselective herbicide widely used, the development of reliable quantification methods to monitor the concentration of this compound in natural environments is of critical importance. In this work, a carbon paste electrode modified by functionalized saponite clay mineral was applied for the first time for the direct quantification of glyphosate. The grafting of the organophilic cationic silane (dimethyloctadecyl[3‐(trimethoxysilyl)propyl]ammonium chloride) was promoted by the highly charged synthetic saponite layers. The characterizations of the organohybrid saponite by Fourier transformed IR (FTIR) and solid state 29 Si NMR spectroscopies confirmed the grafting of the silane while X‐ray diffraction (XRD) analysis revealed the non‐intercalation of the silane in the interlayer space. This surface functionalization resulted in minor modification of the morphology of the saponite particles as observed on the scanning electron microscope (SEM) images. When the functionalized saponite was used as the electrode modifier, the presence of silane increased the glyphosate signal intensity while decreasing the peak potential, certainly through favorable organophilic and electrostatic interactions between the functionalized clay mineral and the negatively charged pesticide. Under optimal experimental conditions (7 %wt in carbon paste and pH of the solution of 8) and for glyphosate concentrations in the range 5 to 60 µM, a detection limit of 0.12 µM was obtained. Excepted for Cu 2+ , which strongly interferes with the glyphosate signal, the other chemical species investigated (Al 3+ , Ca 2+ , Mg 2+ , and paraquat) poorly affect the pesticide detection. Furthermore, this sensor was successfully applied for the quantification of glyphosate in well water, with a recovery higher than 95%.

Hydrogen peroxide (H 2 O 2 ) plays a crucial role in both biological and industrial applications; hence, there is a growing need to develop methods that enable reliable and efficient detection. While traditional techniques such as spectrophotometry and fluorescence provide high sensitivity, electrochemical methods offer rapid, cost‐effective, and real‐time monitoring capabilities. This study explores the role of polyelectrolytes as supporting electrolytes in enhancing electrochemical detection of hydrogen peroxide using copper(II)‐mediated electrocatalysis. Building upon our previous research utilizing polyacrylic acid (PAA), alternative polyelectrolytes, including poly(2‐acrylamido‐2‐methyl‐1‐propanesulfonic acid) (pAMPS) and poly(acrylamide‐co‐acrylic acid) (pAAmAA), were investigated. Cyclic and square‐wave voltammetry were employed to assess the impact of these polymers on the electrochemical performance. Results indicated that pAMPS strongly complexed Cu 2+ , reducing catalytic efficiency, whereas neutralized pAMPS improved Cu 2+ availability, enhancing H 2 O 2 reduction. Among all tested electrolytes, 1% pAAmAA demonstrated the highest sensitivity for direct H 2 O 2 reduction and was subsequently selected for the gas‐phase studies. Further optimization involved modifying pAMPS’ pH, revealing that pAMPS at pH 2 significantly enhanced overall catalytic activity. The combination of pAMPS and pAAmAA with Prussian blue‐modified screen‐printed electrodes enabled H 2 O 2 gas‐phase detection down to 1.8 × 10 −10 mol L −1 . These findings highlight the potential of polyelectrolyte‐based electrolytes for improving the sensitivity and selectivity of electrochemical hydrogen peroxide detection, particularly in gas‐phase applications.