Journal of Electroanalytical Chemistry最新文献

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Heteroatoms-doped porous carbon microspheres derived from cyclotriphosphazene based materials for high performance supercapacitors

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-02-10 DOI: 10.1016/j.jelechem.2025.119006

Muhammad Waqar Hameed , Abdul Majid Khan , Zahid Ali , Sahrish Majeed , Yasir Abbas , Wei Liu , Guang-Xin Chen , Teng Zhang , Zhanpeng Wu

Poly-phosphazenes have emerged as a significant category of organic and inorganic composite materials, that can produce efficient co-doped carbons materials for supercapacitors electrode. In this study, the nitrogen and phosphorus rich cyclotriphosphazene-co-1,5-naphthalene diamine microspheres (CTPND-MS) with tailored properties were synthesized by carbonization of carbon precursor. Micro and mesoporous mixed carbon microspheres (CMS) with high specific surface areas were obtained by varying the heating rates during carbonization: 2 °C min⁻¹ (CTPND-MS2), 5 °C min⁻¹ (CTPND-MS5) and 10 °C min⁻¹ (CTPND-MS10). Among these, CTPND-MS2 demonstrated the highest specific surface area of 749.12 m²/g, with approximately 4.64–5.19 % heteroatom content. This high specific surface area and intrinsically N, P dual doped activated carbon microspheres exhibited a specific gravimetric capacitance of 232.0 F g⁻¹ at current density of 0.1 A/g in a 1 M H₂SO₄ electrolyte in symmetric dual electrode capacitor. CTPND-MS2 demonstrated 98 % cycling stability after 10,000th galvanostatic charge–discharge (GCD) cycles at current density of 5 A/g. Additionally, co-doped microspheres achieved energy density of 8.06 Wh kg⁻¹, at a power density of 24.99 Wh kg⁻¹, at 0.1 A/g. The results establish that phosphazene based materials exhibits an excellent potential for the development of high-performance supercapacitors electrode materials.

{"title":"Heteroatoms-doped porous carbon microspheres derived from cyclotriphosphazene based materials for high performance supercapacitors","authors":"Muhammad Waqar Hameed , Abdul Majid Khan , Zahid Ali , Sahrish Majeed , Yasir Abbas , Wei Liu , Guang-Xin Chen , Teng Zhang , Zhanpeng Wu","doi":"10.1016/j.jelechem.2025.119006","DOIUrl":"10.1016/j.jelechem.2025.119006","url":null,"abstract":"<div><div>Poly-phosphazenes have emerged as a significant category of organic and inorganic composite materials, that can produce efficient co-doped carbons materials for supercapacitors electrode. In this study, the nitrogen and phosphorus rich cyclotriphosphazene-<em>co</em>-1,5-naphthalene diamine microspheres (CTPND-MS) with tailored properties were synthesized by carbonization of carbon precursor. Micro and mesoporous mixed carbon microspheres (CMS) with high specific surface areas were obtained by varying the heating rates during carbonization: 2 °C min<sup>−1</sup> (CTPND-MS2), 5 °C min<sup>−1</sup> (CTPND-MS5) and 10 °C min<sup>−1</sup> (CTPND-MS10). Among these, CTPND-MS2 demonstrated the highest specific surface area of 749.12 m<sup>2</sup>/g, with approximately 4.64–5.19 % heteroatom content. This high specific surface area and intrinsically N, P dual doped activated carbon microspheres exhibited a specific gravimetric capacitance of 232.0 F g<sup>−1</sup> at current density of 0.1 A/g in a 1 M H<sub>2</sub>SO<sub>4</sub> electrolyte in symmetric dual electrode capacitor. CTPND-MS2 demonstrated 98 % cycling stability after 10,000th galvanostatic charge–discharge (GCD) cycles at current density of 5 A/g. Additionally, co-doped microspheres achieved energy density of 8.06 Wh kg<sup>−1</sup>, at a power density of 24.99 Wh kg<sup>−1</sup>, at 0.1 A/g. The results establish that phosphazene based materials exhibits an excellent potential for the development of high-performance supercapacitors electrode materials.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"981 ","pages":"Article 119006"},"PeriodicalIF":4.1,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143396020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of single-atom palladium on the anti-toxicity of electrocatalytic reduction removal of nitrate-nitrogen

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-02-09 DOI: 10.1016/j.jelechem.2025.119003

Wenqian Li , Huiling Jiang , Jing Liang , Zongqiang Zhu , Yinming Fan

The enhancement of palladium-based catalysts’ resistance to sulfide toxicity was pursued through the synthesis of six catalysts, namely PdCu MOF₁₀₀₀, Pd MOF₁₀₀₀, Cu MOF₁₀₀₀, PdCu MOF₅₀₀, Pd MOF₅₀₀, and Cu MOF₅₀₀, employing a hydrothermal method. The study delved into the catalytic reduction capabilities of these six catalysts with respect to nitrate (NO₃-N), alongside exploring the impact of sodium sulfite on the catalytic activities of PdCu MOF₁₀₀₀, Pd MOF₁₀₀₀, and Cu MOF₁₀₀₀. Notably, at a NO₃-N concentration of 50 mg/L, significant removal efficacy was observed for PdCu MOF₁₀₀₀, Pd MOF₁₀₀₀, and Cu MOF₁₀₀₀, with PdCu MOF₁₀₀₀ exhibiting a high nitrate removal rate of 97.8 %. Upon the addition of 200 μM sodium sulfite to the system, the removal efficiency of PdCu MOF₁₀₀₀ was still high at 93.3 %, while a reduction in the removal rate of NO₃-N by Pd MOF₁₀₀₀ was observed. Quenching experiments confirmed the presence of hydrogen radicals (H*) in the reaction system, thereby facilitating the indirect-electrocatalytic reduction of nitrate. This observation suggests that catalysts containing Pd single atoms show promise in enhancing their resilience to sulfide toxicity.

{"title":"Effect of single-atom palladium on the anti-toxicity of electrocatalytic reduction removal of nitrate-nitrogen","authors":"Wenqian Li , Huiling Jiang , Jing Liang , Zongqiang Zhu , Yinming Fan","doi":"10.1016/j.jelechem.2025.119003","DOIUrl":"10.1016/j.jelechem.2025.119003","url":null,"abstract":"<div><div>The enhancement of palladium-based catalysts’ resistance to sulfide toxicity was pursued through the synthesis of six catalysts, namely PdCu MOF<sub>1000</sub>, Pd MOF<sub>1000</sub>, Cu MOF<sub>1000</sub>, PdCu MOF<sub>500</sub>, Pd MOF<sub>500</sub>, and Cu MOF<sub>500</sub>, employing a hydrothermal method. The study delved into the catalytic reduction capabilities of these six catalysts with respect to nitrate (NO<sub>3</sub>-N), alongside exploring the impact of sodium sulfite on the catalytic activities of PdCu MOF<sub>1000</sub>, Pd MOF<sub>1000</sub>, and Cu MOF<sub>1000</sub>. Notably, at a NO<sub>3</sub>-N concentration of 50 mg/L, significant removal efficacy was observed for PdCu MOF<sub>1000</sub>, Pd MOF<sub>1000</sub>, and Cu MOF<sub>1000</sub>, with PdCu MOF<sub>1000</sub> exhibiting a high nitrate removal rate of 97.8 %. Upon the addition of 200 μM sodium sulfite to the system, the removal efficiency of PdCu MOF<sub>1000</sub> was still high at 93.3 %, while a reduction in the removal rate of NO<sub>3</sub>-N by Pd MOF<sub>1000</sub> was observed. Quenching experiments confirmed the presence of hydrogen radicals (H*) in the reaction system, thereby facilitating the indirect-electrocatalytic reduction of nitrate. This observation suggests that catalysts containing Pd single atoms show promise in enhancing their resilience to sulfide toxicity.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"983 ","pages":"Article 119003"},"PeriodicalIF":4.1,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reduction of uranium (VI) in water with additive manufactured electrode

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-02-09 DOI: 10.1016/j.jelechem.2025.119005

Florent Belnou , Michel L. Schlegel , Thomas Proslier , Julie Mayounove , Hicham Maskrot

Nuclear energy has a promising future, but conventional uranium resources are expected to be depleted within a century. Electrochemical extraction could overcome this roadblock by quantitatively recovering uranium dissolved in natural waters using high surface-area electrodes. In this paper, 3D-architected electrodes were manufactured and studied in an electrochemical cell for element extraction. First, untreated flat electrodes made by Laser Powder Bed Fusion (LPBF) and studied by Cyclic Voltammetry (CV) with a custom electrochemical flow cell in a solution of 1 mM Fe(III)(CN)₆³⁻, 0.1 M KCl have exhibited a shift in redox waves because of an oxidized surface. After electro-etching of the electrode surface with oxalic acid, CV exhibited wave positions closer to literature values with higher amplitudes. However, with a solution of 10⁻³ M uranium, 0.1 M NaCl with a pH of 2.3, no electrochemical signals were detected. In contrast, uranium electrochemically reacted with, and was quantitatively retained by an electrode coated with 10 nm of TiO₂ by Atomic Layer Deposition (ALD), and the electrode surface was able to retain uranium by chronoamperometry (CA) (about 0.5 mg for a surface of 3.0 cm²). To increase the reacting surface, 3D-architected electrodes were manufactured, electro-etched and TiO₂-coated. These electrodes showed a tenfold increase in uranium retention (up to 5.7 mg for a surface of 111.1 cm²) that could be partially re-dissolved in a new solution with a yield of 70 %. This work shows the interest of both surface functionalization and architected electrodes for elemental retention.

{"title":"Reduction of uranium (VI) in water with additive manufactured electrode","authors":"Florent Belnou , Michel L. Schlegel , Thomas Proslier , Julie Mayounove , Hicham Maskrot","doi":"10.1016/j.jelechem.2025.119005","DOIUrl":"10.1016/j.jelechem.2025.119005","url":null,"abstract":"<div><div>Nuclear energy has a promising future, but conventional uranium resources are expected to be depleted within a century. Electrochemical extraction could overcome this roadblock by quantitatively recovering uranium dissolved in natural waters using high surface-area electrodes. In this paper, 3D-architected electrodes were manufactured and studied in an electrochemical cell for element extraction. First, untreated flat electrodes made by Laser Powder Bed Fusion (LPBF) and studied by Cyclic Voltammetry (CV) with a custom electrochemical flow cell in a solution of 1 mM Fe(III)(CN)<sub>6</sub><sup>3−</sup>, 0.1 M KCl have exhibited a shift in redox waves because of an oxidized surface. After electro-etching of the electrode surface with oxalic acid, CV exhibited wave positions closer to literature values with higher amplitudes. However, with a solution of 10<sup>−3</sup> M uranium, 0.1 M NaCl with a pH of 2.3, no electrochemical signals were detected. In contrast, uranium electrochemically reacted with, and was quantitatively retained by an electrode coated with 10 nm of TiO<sub>2</sub> by Atomic Layer Deposition (ALD), and the electrode surface was able to retain uranium by chronoamperometry (CA) (about 0.5 mg for a surface of 3.0 cm<sup>2</sup>). To increase the reacting surface, 3D-architected electrodes were manufactured, electro-etched and TiO<sub>2</sub>-coated. These electrodes showed a tenfold increase in uranium retention (up to 5.7 mg for a surface of 111.1 cm<sup>2</sup>) that could be partially re-dissolved in a new solution with a yield of 70 %. This work shows the interest of both surface functionalization and architected electrodes for elemental retention.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"981 ","pages":"Article 119005"},"PeriodicalIF":4.1,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143396000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study of thermodynamic and kinetic behaviours of tin anode and its variation with state of charge, state of health and operating current rates of the battery

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-02-08 DOI: 10.1016/j.jelechem.2025.119001

Arghyadeep Sau, Karabi Das, Siddhartha Das

Rechargeable lithium ion battery is strengthening its hold day by day on market of large range of products requiring different power usages together with other electrochemical properties. Open circuit potential (OCP), which is strongly related to thermodynamics, is one of the parameters which dictates the state of health of the battery. Apart from this, the diffusion coefficient of Li⁺ ions in the electrode material reveals a good picture of kinetics during charge–discharge process. Moreover, ohmic potential drop, electrode overpotential and ohmic resistance associated with various internal resistances, are crucial parameters, which need to be taken care of during the battery operation. Tin (Sn) has the potential to be used as an anode in lithium ion batteries (LIBs) due its high enough theoretical capacity (992mAh g⁻¹) and a suitable operating voltage. In this work, we have applied galvanostatic intermittent titration technique (GITT) to study the variations of diffusivity, thermodynamic factor, OCP, ohmic resistance and overpotential for Sn electrode with different states of charge (SoCs) and analysed the effect of ageing on those parameters. The effects of current rates on these parameters have also been analysed to check the performance and limitation of the battery at higher current rates. Few particular lithiated phases like LiSn, Li₇Sn₃ and Li₇Sn₂ hold the key for major alteration in the kinetic behaviour in terms of diffusivity. This is, in a way, related to the structural modifications and the extent of volume changes of the different lithiated phases formed during operation of the LIB.

{"title":"Study of thermodynamic and kinetic behaviours of tin anode and its variation with state of charge, state of health and operating current rates of the battery","authors":"Arghyadeep Sau, Karabi Das, Siddhartha Das","doi":"10.1016/j.jelechem.2025.119001","DOIUrl":"10.1016/j.jelechem.2025.119001","url":null,"abstract":"<div><div>Rechargeable lithium ion battery is strengthening its hold day by day on market of large range of products requiring different power usages together with other electrochemical properties. Open circuit potential (OCP), which is strongly related to thermodynamics, is one of the parameters which dictates the state of health of the battery. Apart from this, the diffusion coefficient of Li<sup>+</sup> ions in the electrode material reveals a good picture of kinetics during charge–discharge process. Moreover, ohmic potential drop, electrode overpotential and ohmic resistance associated with various internal resistances, are crucial parameters, which need to be taken care of during the battery operation. Tin (Sn) has the potential to be used as an anode in lithium ion batteries (LIBs) due its high enough theoretical capacity (992mAh g<sup>−1</sup>) and a suitable operating voltage. In this work, we have applied galvanostatic intermittent titration technique (GITT) to study the variations of diffusivity, thermodynamic factor, OCP, ohmic resistance and overpotential for Sn electrode with different states of charge (SoCs) and analysed the effect of ageing on those parameters. The effects of current rates on these parameters have also been analysed to check the performance and limitation of the battery at higher current rates. Few particular lithiated phases like LiSn, Li<sub>7</sub>Sn<sub>3</sub> and Li<sub>7</sub>Sn<sub>2</sub> hold the key for major alteration in the kinetic behaviour in terms of diffusivity. This is, in a way, related to the structural modifications and the extent of volume changes of the different lithiated phases formed during operation of the LIB.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"981 ","pages":"Article 119001"},"PeriodicalIF":4.1,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143395934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanism of current amplification based on cyclodextrin-supported supramolecular interaction between catechol and ferrocene

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-02-07 DOI: 10.1016/j.jelechem.2025.118994

Kai Sato , Hiroshi Kimoto , Takeshi Hashimoto

We propose a current amplification mechanism for the rapid and sensitive detection in aqueous solutions, which is based on the supramolecular interaction between catechol and ferrocene in an inclusion complex composed of catechol-modified cyclodextrin and ferrocene. An amplified oxidation current was observed in the cyclic voltammogram of the inclusion complex in phosphate buffer aqueous solution under basic conditions. From the results of electrochemical measurements, we estimated that this oxidation current amplification is due to the concerted oxidation of catechol and ferrocene brought into close proximity via cyclodextrin and the inclusion exchange. Because catechol interacts with boric acid and arsenic acid, this current amplification mechanism shows promising applications in the detection of these chemical species.

引用次数: 0

Scale-up of a BTX electrochemically assisted reactive absorption 扩大 BTX 电化学辅助反应吸收的规模

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-02-07 DOI: 10.1016/j.jelechem.2025.118998

Bryan A. Tiban-Anrango, Andrea N. Arias-Sánchez, Justo Lobato, Manuel A. Rodrigo

Electrochemical technologies have proven highly efficient in remediating polluted gas with benzene, toluene, and xylene (BTX). However, their scalability has yet to be explored to determine the best configurations to maintain optimal removals and energetic efficiencies. Here, we report a straightforward scale-up of an electro-absorption process that combines the absorption of BTX in 0.05 M H₂SO₄ (electrolyte) and their electrochemical oxidation in the electrolyte. The electrochemical cell was upsized by stacking eight single-compartment cells, permitting the circulation of the absorbent in series. The results showed the successful removal of BTX from a synthetic gas stream, which increased at high current densities and low gas flow rates. Average removals over 60 % were achieved in the electro-absorption with 50 mA cm⁻². Analysis of the contaminants in the electrolyte confirmed the absorption of BTXs and their electrochemical oxidation by mineralisation, which was enhanced at larger gas flows and current densities. Nevertheless, a comparison of equivalent scaled and baseline systems indicated an inferior current efficiency on the larger scale due to mass transfer inefficiencies, which are affected by circulating the absorbent in series. These findings suggest that the replication of single electrochemical cells (parallel) can optimise the performance of the electro-absorption degradation of BTX at larger scales.

{"title":"Scale-up of a BTX electrochemically assisted reactive absorption","authors":"Bryan A. Tiban-Anrango, Andrea N. Arias-Sánchez, Justo Lobato, Manuel A. Rodrigo","doi":"10.1016/j.jelechem.2025.118998","DOIUrl":"10.1016/j.jelechem.2025.118998","url":null,"abstract":"<div><div>Electrochemical technologies have proven highly efficient in remediating polluted gas with benzene, toluene, and xylene (BTX). However, their scalability has yet to be explored to determine the best configurations to maintain optimal removals and energetic efficiencies. Here, we report a straightforward scale-up of an electro-absorption process that combines the absorption of BTX in 0.05 M H<sub>2</sub>SO<sub>4</sub> (electrolyte) and their electrochemical oxidation in the electrolyte. The electrochemical cell was upsized by stacking eight single-compartment cells, permitting the circulation of the absorbent in series. The results showed the successful removal of BTX from a synthetic gas stream, which increased at high current densities and low gas flow rates. Average removals over 60 % were achieved in the electro-absorption with 50 mA cm<sup>−2</sup>. Analysis of the contaminants in the electrolyte confirmed the absorption of BTXs and their electrochemical oxidation by mineralisation, which was enhanced at larger gas flows and current densities. Nevertheless, a comparison of equivalent scaled and baseline systems indicated an inferior current efficiency on the larger scale due to mass transfer inefficiencies, which are affected by circulating the absorbent in series. These findings suggest that the replication of single electrochemical cells (parallel) can optimise the performance of the electro-absorption degradation of BTX at larger scales.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"981 ","pages":"Article 118998"},"PeriodicalIF":4.1,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Determination of membrane PD-L1 by SECM technique based on aptamer identification

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-02-07 DOI: 10.1016/j.jelechem.2025.118999

Yuying Du, Ziqi Wang, Jiening Wu, Liping Lu

Membrane proteins play crucial roles in cellular activities and are the major actors of bio-membrane functions. Programmed death ligand receptor 1 (PD-L1) is a type of transmembrane protein that is overexpressed on certain tumor cells, leading to the immune escape of cancer cells. Here, a detection method was developed using scanning electrochemical microscopy (SECM) through aptamer-specific recognition and enzyme-catalyzed reaction, which converts the PD-L1 expression into an electrical signal. The aptamer (MJ5C) modified alkaline phosphatase (ALP) can specifically capture PD-L1, and ALP catalyzes the reduction of 4-aminophenyl phosphate (PAPP) to p-aminophenol (PAP), the current response of PAP at SECM tip is positively correlated with the expression of PD-L1 on NCI-H1975 cell. The results showed that this method could real-time detect the expression of PD-L1 on a single cell stimulated by drugs and dibenzothiophene (DBT). Overall, this method provides a new feasible method for the real-time nondestructive detection of single-cell membrane protein expression and a new avenue for studying the effect of pollutants on membrane protein.

{"title":"Determination of membrane PD-L1 by SECM technique based on aptamer identification","authors":"Yuying Du, Ziqi Wang, Jiening Wu, Liping Lu","doi":"10.1016/j.jelechem.2025.118999","DOIUrl":"10.1016/j.jelechem.2025.118999","url":null,"abstract":"<div><div>Membrane proteins play crucial roles in cellular activities and are the major actors of bio-membrane functions. Programmed death ligand receptor 1 (PD-L1) is a type of transmembrane protein that is overexpressed on certain tumor cells, leading to the immune escape of cancer cells. Here, a detection method was developed using scanning electrochemical microscopy (SECM) through aptamer-specific recognition and enzyme-catalyzed reaction, which converts the PD-L1 expression into an electrical signal. The aptamer (MJ5C) modified alkaline phosphatase (ALP) can specifically capture PD-L1, and ALP catalyzes the reduction of 4-aminophenyl phosphate (PAPP) to p-aminophenol (PAP), the current response of PAP at SECM tip is positively correlated with the expression of PD-L1 on NCI-H1975 cell. The results showed that this method could real-time detect the expression of PD-L1 on a single cell stimulated by drugs and dibenzothiophene (DBT). Overall, this method provides a new feasible method for the real-time nondestructive detection of single-cell membrane protein expression and a new avenue for studying the effect of pollutants on membrane protein.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"980 ","pages":"Article 118999"},"PeriodicalIF":4.1,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143372303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rapid and sensitive determination of sildenafil citrate by adsorption stripping voltammetry using a solid lead microelectrode

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-02-07 DOI: 10.1016/j.jelechem.2025.119000

Mateusz Ochab

A solid state lead microelectrode (PbµE), was used for the rapid and sensitive determination of sildenafil citrate (SC) in pharmaceutical formulations by the stripping method. The method involves the accumulation of SC on a solid lead microelectrode with diameter of 25 µm, by an adsorption process. In the stripping step, two well-formed reduction peaks at −1.22 (P₁) and −1.31 V (P₂) were obtained during SC reduction. The calibration curve of SC for 180 s accumulation time was linear in the range from 5 × 10⁻¹⁰ to 2 × 10⁻⁸ mol/L for P₁ and P₂, while the detection limit was 1.8 × 10⁻¹⁰ and 2.4 × 10⁻¹⁰ mol/L, respectively. The solid lead microelectrode demonstrated good repeatability (RSD 4,2% for n = 10), durability for a long period of time and its more eco-friendly as compared to lead film electrodes. The procedure was successfully applied to the determination of SC in a pharmaceutical formulations.

引用次数: 0

Simultaneous determination of serotonin, dopamine, and ascorbic acid at a glassy carbon electrode modified with chitosan-alginate hydrogel and reduced graphene oxide

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-02-06 DOI: 10.1016/j.jelechem.2025.118992

Katarina S. Postolović , Milan B. Radovanović , Zorka D. Stanić

Detection of biologically active components, such as ascorbic acid, dopamine, and serotonin, is significant from the perspective of biomedicine, particularly in the process of disease diagnosis and in the quality control of commercial pharmaceutical products. In this work, a novel electrochemical sensor was developed by modifying a glassy carbon electrode with a hydrogel composed of a polyelectrolyte complex of alginate and chitosan, along with the addition of electrochemically reduced graphene oxide. This biocompatible sensor was applied for the simultaneous determination of ascorbic acid, dopamine, and serotonin using adsorptive square wave voltammetry. The modified GCE demonstrated an excellent electrochemical response towards the target analytes, thanks to the enhanced adsorption of the analytes on the surface of the electrode, facilitated by favorable interactions between analytes and the modifiers. This approach increased the electrode’s active surface area and ensured excellent electrode response. The sensor exhibited a broad linear range of the anodic current relative to analyte concentration, achieving low detection limits of 0.094 μM, 4.18 nM and 3.23 nM for ascorbic acid, dopamine and serotonin, respectively. Additionally, the proposed sensor exhibited good stability, reproducibility of results, selectivity, as well as effectiveness, in the determination of target biological compounds in real sample matrices.

{"title":"Simultaneous determination of serotonin, dopamine, and ascorbic acid at a glassy carbon electrode modified with chitosan-alginate hydrogel and reduced graphene oxide","authors":"Katarina S. Postolović , Milan B. Radovanović , Zorka D. Stanić","doi":"10.1016/j.jelechem.2025.118992","DOIUrl":"10.1016/j.jelechem.2025.118992","url":null,"abstract":"<div><div>Detection of biologically active components, such as ascorbic acid, dopamine, and serotonin, is significant from the perspective of biomedicine, particularly in the process of disease diagnosis and in the quality control of commercial pharmaceutical products. In this work, a novel electrochemical sensor was developed by modifying a glassy carbon electrode with a hydrogel composed of a polyelectrolyte complex of alginate and chitosan, along with the addition of electrochemically reduced graphene oxide. This biocompatible sensor was applied for the simultaneous determination of ascorbic acid, dopamine, and serotonin using adsorptive square wave voltammetry. The modified GCE demonstrated an excellent electrochemical response towards the target analytes, thanks to the enhanced adsorption of the analytes on the surface of the electrode, facilitated by favorable interactions between analytes and the modifiers. This approach increased the electrode’s active surface area and ensured excellent electrode response. The sensor exhibited a broad linear range of the anodic current relative to analyte concentration, achieving low detection limits of 0.094 μM, 4.18 nM and 3.23 nM for ascorbic acid, dopamine and serotonin, respectively. Additionally, the proposed sensor exhibited good stability, reproducibility of results, selectivity, as well as effectiveness, in the determination of target biological compounds in real sample matrices.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"980 ","pages":"Article 118992"},"PeriodicalIF":4.1,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143377218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Imidazolyl ionic liquid-derived nitrogen-doped carbon layer coated Fe3O4 loaded on graphene as an advanced host for long life lithium sulfur batteries

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-02-06 DOI: 10.1016/j.jelechem.2025.118997

Yonghui Li , Guihong Gao , Tian Han , Jingjing Ruan , Shenshen Li , Hailin Fan , Ziqiang Niu , Tongfei Wang , Shengjie Liang , Feng Huo

Lithium-sulfur batteries are regarded as promising alternatives for next-generation energy storage systems. Developing high-performance lithium-sulfur battery cathode materials requires the efficient synthesis of electrocatalysts that can both anchor LiPS and catalyze their conversion. Herein, we synthesized a composite of ionic liquid-derived nitrogen-doped carbon-coated Fe₃O₄ loaded on graphene (Fe₃O₄@NC/G) by utlizing the π-π interaction between [Bmim][FeCl₄] and graphene. Fe³⁺ ions were uniformly dispersed, effectively preventing particle aggregation during the carbonization process and producing Fe₃O₄ nanoparticles averaging 20.64 nm in size. This structure provides plentiful active sites for adsorbing and catalyzing LiPS, thereby accelerating the redox reaction. Additionally, the nitrogen-doped carbon coating not only stabilizes the Fe₃O₄ nanoparticles and firmly anchors them to the graphene nanosheets, significantly enhancing structural integrity, but also increases the adsorption of LiPS due to the introduction of the heteroatom nitrogen. The assembled LSBs demonstrated excellent cyclic stability with a capacity fade rate of 0.35 % per cycle over 1200 cycles at 1C.

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