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Passivation at a spherical cap microelectrode and comparison to a microdisk: Numerical simulation and experiment 球帽微电极的钝化以及与微盘的比较:数值模拟和实验
IF 2.6 4区 化学 Q3 ELECTROCHEMISTRY Pub Date : 2024-08-13 DOI: 10.1007/s10008-024-06038-7
Koolsiriphorn Shiengjen, Chatuporn Phanthong, Werasak Surareungchai, Mithran Somasundrum

As a model of passivation at a micro or nanoparticle, we have modelled a passivating reaction at a microelectrode of hemispherical geometry. The reaction is considered to lead to either the formation of a surface-bound species or diffusion of product into bulk solution. A dimensionless parameter, p, of value 0 to 1.0 can be used to describe the balance between the two processes. We have simulated the first two linear sweep voltammograms (LSV) under different values of p and have simulated the peak width of the first LSV under different values of scan rate and p. These simulations were used to relate the peak width to the value of p. The results were compared to the characteristics of passivation at a microdisk electrode. The equation was used to analyse the oxidation of dopamine at hemispherical Ga electrodes, fabricated by the deposition of liquid phase Ga onto Pt microdisks.

作为微型或纳米粒子的钝化模型,我们模拟了半球形微电极的钝化反应。该反应被认为会导致表面结合物种的形成或产物扩散到大体积溶液中。无量纲参数 p 的值为 0 至 1.0,可用来描述这两个过程之间的平衡。我们模拟了不同 p 值下的前两个线性扫描伏安图 (LSV),并模拟了不同扫描速率和 p 值下第一个 LSV 的峰值宽度。该方程用于分析多巴胺在半球形镓电极上的氧化情况,半球形镓电极是通过在铂微盘上沉积液相镓而制成的。
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引用次数: 0
Low-cost electrochemical sensor for ciprofloxacin antibiotic based on green-synthesized silver nanoparticles and carbon black 基于绿色合成银纳米粒子和炭黑的低成本环丙沙星抗生素电化学传感器
IF 2.5 4区 化学 Q3 ELECTROCHEMISTRY Pub Date : 2024-08-13 DOI: 10.1007/s10008-024-06033-y
Laís Muniz Meireles, Rafael Matias Silva, Renê Chagas da Silva, Leonardo Luiz Okumura, Renata Pereira Lopes Moreira, Tiago Almeida Silva

An unprecedented electrochemical sensor based on low-cost films combining carbon black (CB) and green-synthesized silver nanoparticles (AgNPs) is proposed for the voltammetric determination of ciprofloxacin, an antibiotic widely used in the treatment of infectious diseases. AgNPs were biosynthesized by using an aqueous plant extract of Camellia sinensis (black tea) in which the metabolites worked as reducing and stabilizing agents. The AgNPs and CB nanoparticles were incorporated within a crosslinked chitosan (Ch) film over the surface of a glassy carbon electrode (GCE). The nanomaterials were characterized by scanning electron microscopy (SEM), ultraviolet–visible molecular absorption spectrophotometry (UV–Vis), dynamic light scattering (DLS), zeta potential, and cyclic voltammetry (CV). The sensor modified with both nanomaterials (AgNPs-CB-Ch/GCE) showed a significatively enhanced analytical signal for the ciprofloxacin irreversible oxidation peak. Using square-wave voltammetry (SWV) under the optimized working conditions and the proposed AgNPs-CB-Ch/GCE sensor, the analytical curve displayed two linear concentration ranges of 3.1 to 24.8 µmol L−1 and of 36.9 to 130.3 µmol L−1, with a limit of detection of 0.48 µmol L−1. The proposed electrochemical sensor presented good precision as shown from repeatability tests, as well as it was successfully applied in the quantification of ciprofloxacin in the synthetic urine sample, with recovery results close to 100% for both linear concentration ranges. The presented AgNPs synthetic method and CIP electrochemical detection are found to be simple and efficient compared to the conventional methods commonly reported.

本文提出了一种前所未有的电化学传感器,该传感器基于碳黑(CB)和绿色合成银纳米粒子(AgNPs)的低成本薄膜,用于伏安法测定环丙沙星,环丙沙星是一种广泛用于治疗传染病的抗生素。AgNPs 是利用茶树(红茶)的水性植物提取物进行生物合成的,其中的代谢产物可作为还原剂和稳定剂。AgNPs和CB纳米颗粒被纳入玻璃碳电极(GCE)表面的交联壳聚糖(Ch)薄膜中。通过扫描电子显微镜(SEM)、紫外可见光分子吸收分光光度法(UV-Vis)、动态光散射(DLS)、ZETA 电位和循环伏安法(CV)对纳米材料进行了表征。用这两种纳米材料修饰的传感器(AgNPs-CB-Ch/GCE)显示出环丙沙星不可逆氧化峰的分析信号明显增强。在优化的工作条件下使用方波伏安法(SWV)和拟议的 AgNPs-CB-Ch/GCE 传感器,分析曲线显示出 3.1 至 24.8 µmol L-1 和 36.9 至 130.3 µmol L-1 两个线性浓度范围,检测限为 0.48 µmol L-1。重复性测试表明,所提出的电化学传感器具有良好的精度,并成功地应用于合成尿样中环丙沙星的定量分析,在两个线性浓度范围内的回收率均接近 100%。与常见的传统方法相比,本文介绍的 AgNPs 合成方法和 CIP 电化学检测方法简单高效。
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引用次数: 0
Investigation of electrolyte parameters on the performance of gadolinium-doped ceria–based solid oxide fuel cell: an analytical study 电解质参数对掺钆铈固体氧化物燃料电池性能的影响:分析研究
IF 2.6 4区 化学 Q3 ELECTROCHEMISTRY Pub Date : 2024-08-13 DOI: 10.1007/s10008-024-06028-9
Akash Patnaik, Pankaj Sharma

An analytical study of the effect of gadolinium-doped ceria (GDC) electrolyte parameters on the output voltage, output power, open circuit no-load voltage, and leakage current is carried out for solid oxide fuel cell (SOFC). Conductivity due to both ions and electrons is considered for GDC electrolytes. The model incorporates various polarization losses such as activation overpotential, concentration overpotential, and ohmic potential losses in order to study the effect of electrolyte parameters on output voltage. The output voltage and, hence, the power density obtained from the model closely match the experimental reports, thus validating the model. Subsequently, the open circuit no-load voltage model and no-load leakage current are used to study the effect of electrolyte thickness and electronic conductivity on it during no-load conditions. During loaded condition, the model relating the electronic current with the ionic current is employed to analyze the effect of various SOFC parameters governing the electronic current density. This study will be instrumental in designing SOFC with low leakage current density and high output power in order to enhance the performance of SOFC.

对固体氧化物燃料电池(SOFC)的掺钆陶瓷(GDC)电解质参数对输出电压、输出功率、开路空载电压和泄漏电流的影响进行了分析研究。GDC 电解质考虑了离子和电子的导电性。该模型纳入了各种极化损失,如活化过电位、浓度过电位和欧姆电位损失,以研究电解质参数对输出电压的影响。从模型中得到的输出电压以及功率密度与实验报告非常吻合,从而验证了模型的有效性。随后,利用开路空载电压模型和空载泄漏电流研究了空载条件下电解质厚度和电子导电率对其的影响。在加载条件下,采用电子电流与离子电流相关模型来分析各种 SOFC 参数对电子电流密度的影响。这项研究将有助于设计具有低漏电流密度和高输出功率的 SOFC,从而提高 SOFC 的性能。
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引用次数: 0
Simultaneous electrochemical determination of carbendazim and thiabendazole pesticides based on UiO-66(Zr)-NH-OC-MWCNT 3D coated glassy carbon electrode 基于 UiO-66(Zr)-NH-OC-MWCNT 3D 涂层玻璃碳电极的多菌灵和噻菌灵农药同时电化学测定方法
IF 2.6 4区 化学 Q3 ELECTROCHEMISTRY Pub Date : 2024-08-13 DOI: 10.1007/s10008-024-06039-6
Ranjit Hazarika, Gullit Deffo, Nayab Hussain, Honore Nogholesso Wamba, Uddipana Saikia, Mwina Basumatary, Mridupavan Dutta, Soumen Dasgupta, Evangéline Njanja, Panchanan Puzari

The work reported herein describes the synthesis of a 3D material UiO-66(Zr)-NH-OC-MWCNT by combining a synthesized metal–organic framework UiO-66(Zr)-NH2 and a carboxy functionalized multi-walled carbon nanotube MWCNT-COOH via an amide linkage and demonstrated its application for simultaneous electrochemical determination of two benzimidazole fungicides-carbendazim and thiabendazole. Different analytical techniques like Fourier transform infrared spectroscopy, X-ray diffraction analysis, Brunauer–Emmett–Teller analysis, and Field emission scanning electron microscopy were employed to characterize all the synthesized materials. The electrochemical characterization of the fabricated electrode was carried out using cyclic voltammetry and electrochemical impedance spectroscopy. Cyclic voltammetry and differential pulse voltammetry techniques have been used for the electroanalysis of carbendazim and thiabendazole. A limit of detection of 0.077 µM and 0.557 µM, respectively, have been obtained in the calibration range of 0.1 to 40 µM for carbendazim and 1 to 40 µM for thiabendazole, after optimization of several parameters which are susceptible to the sensitivity and selectivity of the developed sensor. Furthermore, with satisfactory results from the study of interferences, repeatability, and reproducibility, the proposed electrochemical sensor was successfully applied for analysis of carbendazim and thiabendazole in real samples.

Graphical Abstract

本文报告的工作介绍了通过酰胺连接将合成的金属有机框架 UiO-66(Zr)-NH 与羧基功能化多壁碳纳米管 MWCNT-COOH 结合在一起,合成出一种三维材料 UiO-66(Zr)-NH-OC-MWCNT,并将其应用于同时电化学测定两种苯并咪唑类杀菌剂--烯啶虫胺和噻菌灵。傅立叶变换红外光谱、X 射线衍射分析、布鲁瑙尔-艾美特-泰勒分析和场发射扫描电子显微镜等不同的分析技术被用于表征所有合成材料。使用循环伏安法和电化学阻抗光谱法对制作的电极进行了电化学表征。循环伏安法和差分脉冲伏安法技术被用于多菌灵和噻苯咪唑的电分析。在对影响所开发传感器灵敏度和选择性的几个参数进行优化后,在 0.1 至 40 µM 的校准范围内,多菌灵和噻苯咪唑的检测限分别为 0.077 µM 和 0.557 µM。此外,由于对干扰、重复性和再现性的研究结果令人满意,所开发的电化学传感器被成功地应用于实际样品中多菌灵和噻菌灵的分析。
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引用次数: 0
A high sensitivity adsorptive-electrochemical method for rapid and portable determination of hydroxychloroquine 快速便携测定羟氯喹的高灵敏度吸附电化学方法
IF 2.5 4区 化学 Q3 ELECTROCHEMISTRY Pub Date : 2024-08-12 DOI: 10.1007/s10008-024-06032-z
João Pedro C. Silva, Domingos R. Santos-Neto, Carlos E. C. Lopes, Luiz R. G. Silva, Luiza M. F. Dantas, Iranaldo S. da Silva

On March 11, 2020, the World Health Organization declared the coronavirus disease pandemic, caused by the SARS-CoV-2 virus. This declaration propelled the drug hydroxychloroquine into the global spotlight, as it was identified as a potential early treatment for the disease. Consequently, there was a surge in its consumption worldwide, particularly in Brazil. This increased usage has raised concerns about the potential contamination of natural water sources. In response to this concern, the present study proposes an electroanalytical method for detecting hydroxychloroquine in pharmaceutical and drinking water samples. The method aims to study the effects of modifying the sensor with carbon black Super P for HCQ detection, as well as improving the reproducibility and repeatability of the SPCB/GCE. The detection method and sensor modification have been thoroughly optimized for hydroxychloroquine detection. The optimal analysis conditions were established with a concentration of 5.0 mg mL−1 of SPCB, a pH of 7.00, and a preconcentration time of 2 min. The detection and quantification limits were determined to be 0.0093 µmol L−1 and 0.0312 µmol L−1, respectively, with a linear range between 0.10 and 10.0 µmol L−1. Analyses conducted on fortified samples indicated recovery responses of 110% for tap water and 100.5% for drug samples, demonstrating the method’s high accuracy, particularly for pharmaceutical samples.

2020 年 3 月 11 日,世界卫生组织宣布由 SARS-CoV-2 病毒引起的冠状病毒疾病大流行。这一宣布将羟氯喹药物推向了全球的聚光灯下,因为它被认为是一种潜在的疾病早期治疗药物。因此,羟氯喹在全球的消费量激增,尤其是在巴西。使用量的增加引起了人们对天然水源可能受到污染的担忧。针对这种担忧,本研究提出了一种电分析方法,用于检测药品和饮用水样本中的羟氯喹。该方法旨在研究用超级 P 炭黑改性传感器对检测 HCQ 的影响,以及提高 SPCB/GCE 的重现性和重复性。针对羟氯喹的检测,对检测方法和传感器改性进行了全面优化。最佳分析条件为 SPCB 浓度为 5.0 mg mL-1、pH 值为 7.00、预浓缩时间为 2 分钟。检测限和定量限分别为 0.0093 µmol L-1 和 0.0312 µmol L-1,线性范围在 0.10 至 10.0 µmol L-1 之间。对强化样品进行的分析表明,自来水的回收率为 110%,药物样品的回收率为 100.5%,这表明该方法的准确度很高,尤其适用于药物样品。
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引用次数: 0
A short review on fast charging of Ni-rich layered oxide cathodes 富镍层状氧化物阴极快速充电简评
IF 2.5 4区 化学 Q3 ELECTROCHEMISTRY Pub Date : 2024-08-11 DOI: 10.1007/s10008-024-06031-0
Jyotirekha Dutta, Shuvajit Ghosh, Surendra K. Martha

Fast charging (~ 6 C rate) of Li-ion batteries (LIBs) is a key requirement to practically realize the growth of the electric vehicles (EVs) market. According to the US Department of Energy (DOE), the fast charge goal is an average of 20 mi min−1 (miles added per minute) or more. However, current state-of-art battery technologies are still far away from the requirements. Ni-rich layered oxide materials are promising cathode materials for the long run due to their high practically achievable capacity of 200 mAh g−1 at an average voltage of 3.8 V vs. Li+ /Li. Under fast charging, Ni-rich cathodes undergo anisotropic volume change followed by microcracks formation. As the Ni content increases, the particle crack formation becomes more severe under fast charging. This review article presents a mechanistic insight into the degradation of Ni-rich cathode materials during fast charging, bulk and surface structural evolution during delithiation-lithiation, lithium-ion diffusion kinetics, an overview of the mitigation strategy, and the practical reality of Ni-rich layered oxide cathode materials for fast charging applications.

Graphical abstract

锂离子电池 (LIB) 的快速充电(约 6 C 速率)是切实实现电动汽车 (EV) 市场增长的关键要求。根据美国能源部(DOE)的规定,快速充电的目标是平均每分钟增加 20 mi-1(英里)或更多。然而,目前最先进的电池技术离这一要求还很遥远。富含镍的层状氧化物材料在平均电压为 3.8 V 时与 Li+ /Li 相比可达到 200 mAh g-1 的高实际容量,因此从长远来看,富含镍的层状氧化物材料是一种前景广阔的阴极材料。在快速充电时,富镍阴极会发生各向异性的体积变化,随后形成微裂缝。随着镍含量的增加,颗粒裂纹的形成在快速充电下变得更加严重。这篇综述文章从机理角度阐述了快速充电过程中富镍正极材料的降解、脱锂-锂化过程中的体积和表面结构演变、锂离子扩散动力学、缓解策略概述以及快速充电应用中富镍层状氧化物正极材料的实际情况。
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引用次数: 0
Bimetallic Bi-In nanoparticles for efficient production of formate via electrocatalytic conversion of CO2 通过二氧化碳的电催化转化高效生产甲酸盐的双金属 Bi-In 纳米粒子
IF 2.6 4区 化学 Q3 ELECTROCHEMISTRY Pub Date : 2024-08-10 DOI: 10.1007/s10008-024-06042-x
Chenyang Mo, Chan Yang, Yarong Hu, Juan Peng
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引用次数: 0
Synthesis, characterization, and mechanistic study involved in the self-doping of TiO2 nanotubes simultaneously to the impedimetric detection of methylene blue 与亚甲基蓝阻抗检测同时进行的二氧化钛纳米管自掺杂的合成、表征和机理研究
IF 2.6 4区 化学 Q3 ELECTROCHEMISTRY Pub Date : 2024-08-10 DOI: 10.1007/s10008-024-06027-w
Pablo C. Soto, João V. Martins, Gabrielle Sarto, Maiara M. Slonski, Helder S. Anizelli, Elivelton A. Ferreira, T. N. Cervantes, Lucio C. Almeida
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引用次数: 0
Bimetallic Bi-In nanoparticles for efficient production of formate via electrocatalytic conversion of CO2 通过二氧化碳的电催化转化高效生产甲酸盐的双金属 Bi-In 纳米粒子
IF 2.6 4区 化学 Q3 ELECTROCHEMISTRY Pub Date : 2024-08-10 DOI: 10.1007/s10008-024-06042-x
Chenyang Mo, Chan Yang, Yarong Hu, Juan Peng

Electrocatalytic reduction of CO2 to valuable chemicals can alleviate the energy crisis and reduce the greenhouse effect. Herein, bimetallic BixIny (x, y is percentage composition) nanoparticles (NPs) were successfully prepared and utilized as electrocatalysts for electrochemical conversion of CO2 to formate. By changing the Bi/In atom ratio and varying the amount of surfactant PVP and solvent DMF, the surface morphology of and the electronic structure of BixIny catalysts can be optimized. The optimized Bi88.77In11.23 NPs were the most favorable for formate formation and the FE (Faradaic efficiency) of formate reached 94.29% at a potential of − 1.0 V (vs. RHE). The DFT calculations confirmed that the synergistic effect of bimetallic and dense nanoparticle structures promotes the adsorption of CO2 molecules and major *OCHO intermediates at active sites, thus accelerating the reaction rate. The Bi88.77In11.23 NPs were further employed as cathode coupling oxygen evolution reaction to construct a two-electrode electrolysis system (CO2RR‖OER). The whole electrolysis needed a low cell voltage of 3.4 V to deliver 10 mA/cm2. This study will provide an efficient approach to enhance the activity and selectivity for CO2RR by the synergistic effect of bimetal.

通过电催化将二氧化碳还原成有价值的化学物质可以缓解能源危机和减少温室效应。本文成功制备了双金属 BixIny(x、y 为百分比组成)纳米粒子(NPs),并将其用作电化学将 CO2 转化为甲酸盐的电催化剂。通过改变 Bi/In 原子比例、表面活性剂 PVP 和溶剂 DMF 的用量,可以优化 BixIny 催化剂的表面形貌和电子结构。优化后的Bi88.77In11.23 NPs最有利于甲酸盐的形成,在电位为-1.0 V(相对于RHE)时,甲酸盐的FE(法拉第效率)达到94.29%。DFT 计算证实,双金属和致密纳米粒子结构的协同效应促进了活性位点对 CO2 分子和主要 *OCHO 中间产物的吸附,从而加快了反应速率。Bi88.77In11.23 纳米粒子被进一步用作耦合氧进化反应的阴极,从而构建了双电极电解系统(CO2RR‖OER)。整个电解过程只需要 3.4 V 的低电池电压就能提供 10 mA/cm2 的电流。这项研究将为利用双金属的协同效应提高 CO2RR 的活性和选择性提供一种有效的方法。
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引用次数: 0
Simple and rapid electrochemical determination of endosulfan in vegetables by polyaniline/Fe-ZnO nanocomposite-modified glassy carbon electrode 聚苯胺/铁-氧化锌纳米复合材料修饰的玻璃碳电极简单快速地电化学测定蔬菜中的硫丹含量
IF 2.6 4区 化学 Q3 ELECTROCHEMISTRY Pub Date : 2024-08-09 DOI: 10.1007/s10008-024-06041-y
Toleshi Teshome, Abera Gure, Shimeles Addisu Kitte, Guta Gonfa

Endosulfan is an organochlorine pesticide widely used in agriculture to protect crops such as cotton, soybeans, coffee, tea, cereals, fruits, vegetables, and grains from pests. However, exposure to low concentrations of endosulfan causes harmful effects on humans’ health. Therefore, the determination of endosulfan in food samples by a fast, simple, and cost-effective method is pivotal. In this study, an electrochemical sensor based on a polyaniline/Fe-ZnO-modified glassy carbon electrode (PANI/Fe-ZnO/GCE) was developed for the determination of endosulfan in vegetables. The synthesized nanomaterials were characterized by Fourier transform infrared (FT-IR), X-ray diffraction (XRD), and scanning electron microscopy (SEM). PANI/Fe-ZnO/GCE showed remarkable electrocatalytic activity for the determination of endosulfan in vegetables. It also exhibited a good linear response to endosulfan concentrations ranging from 1 to 400 µM. The method displayed a low detection limit (LOD) of 0.003 µM. The sensor showed good selectivity, long-term stability, good repeatability, and within-lab reproducibility. It was also applied for the determination of endosulfan in tomatoes and potatoes, with acceptable recoveries ranging from 87.00 to 96.80%.

Graphical abstract

Graphical illustration of PANI/Fe-ZnO modified glassy carbon electrode for endosulfan determination in vegetables

硫丹是一种有机氯杀虫剂,广泛用于农业领域,以保护棉花、大豆、咖啡、茶叶、谷物、水果、蔬菜和谷物等农作物免受害虫侵害。然而,接触低浓度的硫丹会对人体健康造成危害。因此,采用快速、简单、经济有效的方法测定食品样品中的硫丹含量至关重要。本研究开发了一种基于聚苯胺/Fe-ZnO修饰的玻璃碳电极(PANI/Fe-ZnO/GCE)的电化学传感器,用于测定蔬菜中的硫丹。傅立叶变换红外(FT-IR)、X 射线衍射(XRD)和扫描电子显微镜(SEM)对合成的纳米材料进行了表征。在测定蔬菜中硫丹含量时,PANI/Fe-ZnO/GCE表现出了显著的电催化活性。此外,它还对 1 至 400 µM 的硫丹浓度表现出良好的线性响应。该方法的检测限(LOD)低至 0.003 µM。该传感器具有良好的选择性、长期稳定性、重复性和实验室内重现性。该方法还被用于测定番茄和马铃薯中的硫丹,回收率在 87.00% 至 96.80% 之间。
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引用次数: 0
期刊
Journal of Solid State Electrochemistry
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