Electrochemistry Communications最新文献

Alcohol electrooxidation on three-component NiO/La2O3/MWCNTs catalyst for DAFC application

IF 4.7 3区工程技术 Q2 ELECTROCHEMISTRY

Electrochemistry Communications

Pub Date : 2025-04-17 DOI: 10.1016/j.elecom.2025.107936

Ali Ahmadi , Hadi Ebrahimifar , Mohammad Bagher Askari

Alcohol electrooxidation is a crucial reaction in direct alcohol fuel cells (DAFCs), efficiently converting alcohols like methanol and ethanol into electricity with minimal environmental impact, offering a sustainable alternative to fossil fuels. This process is vital for renewable energy technologies, promoting clean energy solutions. Research in this field considers electrocatalyst development, improving reaction kinetics, and reducing fuel cell costs. The wide application of catalyst-based metal oxides led us to synthesize a three-component catalyst, including nickel oxide (NiO)/lanthanum oxide (La₂O₃) catalyst and its hybrid with carbon nanotubes (MWCNT), with the hydrothermal method. The capability of catalysts was investigated in alcohol oxidation reactions (AOR). The successful synthesis of NiO/La₂O₃ and NiO/La₂O₃/MWCNTs catalysts was confirmed. The effect of adding carbon nanotubes to the NiO/La₂O₃ double metal oxide structure on the methanol and ethanol oxidation reaction (MOR and EOR) was investigated. In MOR and EOR by NiO/La₂O₃/MWCNTs catalyst, the maximum current densities of 110.71 and 43.56 mA/cm² were obtained at potentials of 0.66 and 0.62 V, respectively, representing relatively good efficiency as a direct alcohol fuel cell (DAFC) catalyst. Also, the comparison of the Tofel slope of NiO/ La₂O₃ and NiO/La₂O₃/MWCNTs catalysts in MOR and EOR processes shows the faster kinetics of the catalyst containing carbon nanotubes in these processes. So, good performance and high stability of catalysts can be promising for further operational investigations.

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引用次数: 0

Overoxidized electropolymerized poly(pyrrole-1-propionic acid) on screen-printed graphene electrode-based electrochemical sensor for selective detection of dopamine neurotransmitters in the presence of norepinephrine and serotonin

IF 4.7 3区工程技术 Q2 ELECTROCHEMISTRY

Electrochemistry Communications

Pub Date : 2025-04-16 DOI: 10.1016/j.elecom.2025.107934

Jeerakit Thangphatthanarungruang , Wichayaporn Kamsong , Chanchai Charonpongsuntorn , Papan Thaipisuttikul , Pisist Kumnorkaew , Patcharin Chaisuwan , Chanpen Karuwan

The accuracy and reliability of quantitative analysis are critical for the practical application of analytical methods. Hence, this study pioneered the use of overoxidized electropolymerized poly(pyrrole-1-propionic acid) on a screen-printed graphene electrode as an electrochemical sensor for the selective detection of dopamine (DOP) in the presence of norepinephrine (NOR) and serotonin (SER) at physiological levels in urine. These compounds are the primary monoamine neurotransmitters in the brain that are associated with specific symptoms of depression. The developed sensor was fabricated through a facile electropolymerization and overoxidation process of the polymer on the printed electrode via cyclic voltammetry. Previous results of important studies on electrode fabrication and characterization were verified through a field-emission scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and electrochemical impedance spectroscopy. Under optimal conditions, the proposed sensor exhibited a dynamic concentration range of 250–5000 nM and a low detection limit of 16.53 nM for DOP detection. Moreover, the proposed method demonstrated highly selective DOP detection without interference from NOR and SER. To evaluate its biological applicability, we tested the developed method in synthetic urine samples. The proposed sensor can be productively used as an alternative electrochemical sensor with high accuracy and good precision. Therefore, this sensor is well-suited for quantitative analytical applications in the monitoring of DOP neurotransmitter levels in the nervous system, which can affect human health.

{"title":"Overoxidized electropolymerized poly(pyrrole-1-propionic acid) on screen-printed graphene electrode-based electrochemical sensor for selective detection of dopamine neurotransmitters in the presence of norepinephrine and serotonin","authors":"Jeerakit Thangphatthanarungruang , Wichayaporn Kamsong , Chanchai Charonpongsuntorn , Papan Thaipisuttikul , Pisist Kumnorkaew , Patcharin Chaisuwan , Chanpen Karuwan","doi":"10.1016/j.elecom.2025.107934","DOIUrl":"10.1016/j.elecom.2025.107934","url":null,"abstract":"<div><div>The accuracy and reliability of quantitative analysis are critical for the practical application of analytical methods. Hence, this study pioneered the use of overoxidized electropolymerized poly(pyrrole-1-propionic acid) on a screen-printed graphene electrode as an electrochemical sensor for the selective detection of dopamine (DOP) in the presence of norepinephrine (NOR) and serotonin (SER) at physiological levels in urine. These compounds are the primary monoamine neurotransmitters in the brain that are associated with specific symptoms of depression. The developed sensor was fabricated through a facile electropolymerization and overoxidation process of the polymer on the printed electrode via cyclic voltammetry. Previous results of important studies on electrode fabrication and characterization were verified through a field-emission scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and electrochemical impedance spectroscopy. Under optimal conditions, the proposed sensor exhibited a dynamic concentration range of 250–5000 nM and a low detection limit of 16.53 nM for DOP detection. Moreover, the proposed method demonstrated highly selective DOP detection without interference from NOR and SER. To evaluate its biological applicability, we tested the developed method in synthetic urine samples. The proposed sensor can be productively used as an alternative electrochemical sensor with high accuracy and good precision. Therefore, this sensor is well-suited for quantitative analytical applications in the monitoring of DOP neurotransmitter levels in the nervous system, which can affect human health.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"176 ","pages":"Article 107934"},"PeriodicalIF":4.7,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143842930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Highlighting real capacitor behavior in liquid ammonia of passivated n-InP by thin Polyphosphazene film

IF 4.7 3区工程技术 Q2 ELECTROCHEMISTRY

Electrochemistry Communications

Pub Date : 2025-04-15 DOI: 10.1016/j.elecom.2025.107935

Gianluca Visagli, Arnaud Etcheberry, Anne-Marie Gonçalves

Semiconductor/liquid junctions exhibit distinctive electrochemical behaviors. This study investigates the passivation of lightly doped (10¹⁵ cm⁻³) n-type indium phosphide (n-InP) in liquid ammonia. Under photoanodic conditions, a Polyphosphazene (PPP) film forms on the InP surface. The formation of PPP ultra-thin film was confirmed through X-ray photoelectron spectroscopy. Cyclic voltammetry revealed a progressive positive shift in the onset potential for photocurrent, indicating successful progressive passivation. Capacitance–voltage measurements showed a constant capacitance (≈ 1.3 μF.cm⁻²) over 400 mV after passivation, signifying the formation of a stable capacitor-like structure at the interface in a large potential domain. Cyclic voltammograms acquired at different scan rates demonstrated that the current was proportional to the scan rate, confirming the capacitive nature of the InP/PPP interface. The same interface capacitance was also quantified from the slope of the linear fit between the current and scan rate, showing that the PPP film acts as a dielectric layer with a fixed capacitance. This capacitor-like behavior leads the semiconductor in accumulation configuration from open circuit potential to lower potentials. To balance the electrical charges, the PPP should be positively charged in this range of potentials. The capacitance was used to determine the relative dielectric constant of the PPP film, which was found to be approximately 6.9. This value is consistent with that of polymeric materials exhibiting good insulating properties, further supporting the effective dielectric behavior of the PPP layer. This capacitor-like behavior alters the electrochemical response and stability of the InP/NH₃ Liq. interface, underscoring its potential for innovative electrochemical applications.

{"title":"Highlighting real capacitor behavior in liquid ammonia of passivated n-InP by thin Polyphosphazene film","authors":"Gianluca Visagli, Arnaud Etcheberry, Anne-Marie Gonçalves","doi":"10.1016/j.elecom.2025.107935","DOIUrl":"10.1016/j.elecom.2025.107935","url":null,"abstract":"<div><div>Semiconductor/liquid junctions exhibit distinctive electrochemical behaviors. This study investigates the passivation of lightly doped (10<sup>15</sup> cm<sup>−3</sup>) n-type indium phosphide (n-InP) in liquid ammonia. Under photoanodic conditions, a Polyphosphazene (PPP) film forms on the InP surface. The formation of PPP ultra-thin film was confirmed through X-ray photoelectron spectroscopy. Cyclic voltammetry revealed a progressive positive shift in the onset potential for photocurrent, indicating successful progressive passivation. Capacitance–voltage measurements showed a constant capacitance (≈ 1.3 μF.cm<sup>−2</sup>) over 400 mV after passivation, signifying the formation of a stable capacitor-like structure at the interface in a large potential domain. Cyclic voltammograms acquired at different scan rates demonstrated that the current was proportional to the scan rate, confirming the capacitive nature of the InP/PPP interface. The same interface capacitance was also quantified from the slope of the linear fit between the current and scan rate, showing that the PPP film acts as a dielectric layer with a fixed capacitance. This capacitor-like behavior leads the semiconductor in accumulation configuration from open circuit potential to lower potentials. To balance the electrical charges, the PPP should be positively charged in this range of potentials. The capacitance was used to determine the relative dielectric constant of the PPP film, which was found to be approximately 6.9. This value is consistent with that of polymeric materials exhibiting good insulating properties, further supporting the effective dielectric behavior of the PPP layer. This capacitor-like behavior alters the electrochemical response and stability of the InP/NH₃ Liq. interface, underscoring its potential for innovative electrochemical applications.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"176 ","pages":"Article 107935"},"PeriodicalIF":4.7,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143842928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Carbon black on ordered scaffold of titania nanotubes as smart nanoengineered material for the next generation of highly sensitive electrode

IF 4.7 3区工程技术 Q2 ELECTROCHEMISTRY

Electrochemistry Communications

Pub Date : 2025-04-14 DOI: 10.1016/j.elecom.2025.107932

Wiktoria Lipińska , Christian Gosti , Luca Fiore , Jakub Karczewski , Katarzyna Siuzdak , Fabiana Arduini

This study presents the first three-electrode system, which combines the extensive nanostructured surface of hydrogenated TiO₂ nanotubes and the electrochemical properties of carbon black to develop an electrochemical sensor with a nanoengineered surface. The use of TiO₂ nanotubes as a substrate allowed for the deposition of a high amount of carbon black up to 120 μg per cm² on the electrode surface without observing an undesired aggregation encountered in the case of other sensors. Electrochemical measurements revealed that the increase of carbon black amount improved electrode performance, showing the lowest peak-to-peak separation (240 mV) and the highest current density (1.63 mA cm⁻²). Electrochemical impedance spectroscopy demonstrated that the carbon black-modified hydrogenated TiO₂ nanotube electrode exhibited lower charge transfer resistance (52.88 Ω) than the unmodified electrode (12,290 Ω). The performance of both the hydrogenated TiO₂ nanotube electrode and the optimized carbon black modified-electrode was evaluated for the detection of model analytes namely epinephrine, norepinephrine, benzoquinone, catechol, ascorbic acid, and caffeic acid. The results demonstrated an improved electrochemical response, emphasizing the enhanced detection capabilities achieved by integrating carbon black on the TiO₂ nanotube structure. This modification opens new possibilities for the development of highly sensitive electrochemical sensors by engineering the electrochemical surface before the modification of the working electrode surface with carbon black.

{"title":"Carbon black on ordered scaffold of titania nanotubes as smart nanoengineered material for the next generation of highly sensitive electrode","authors":"Wiktoria Lipińska , Christian Gosti , Luca Fiore , Jakub Karczewski , Katarzyna Siuzdak , Fabiana Arduini","doi":"10.1016/j.elecom.2025.107932","DOIUrl":"10.1016/j.elecom.2025.107932","url":null,"abstract":"<div><div>This study presents the first three-electrode system, which combines the extensive nanostructured surface of hydrogenated TiO₂ nanotubes and the electrochemical properties of carbon black to develop an electrochemical sensor with a nanoengineered surface. The use of TiO₂ nanotubes as a substrate allowed for the deposition of a high amount of carbon black up to 120 μg per cm<sup>2</sup> on the electrode surface without observing an undesired aggregation encountered in the case of other sensors. Electrochemical measurements revealed that the increase of carbon black amount improved electrode performance, showing the lowest peak-to-peak separation (240 mV) and the highest current density (1.63 mA cm<sup>−2</sup>). Electrochemical impedance spectroscopy demonstrated that the carbon black-modified hydrogenated TiO<sub>2</sub> nanotube electrode exhibited lower charge transfer resistance (52.88 Ω) than the unmodified electrode (12,290 Ω). The performance of both the hydrogenated TiO₂ nanotube electrode and the optimized carbon black modified-electrode was evaluated for the detection of model analytes namely epinephrine, norepinephrine, benzoquinone, catechol, ascorbic acid, and caffeic acid. The results demonstrated an improved electrochemical response, emphasizing the enhanced detection capabilities achieved by integrating carbon black on the TiO₂ nanotube structure. This modification opens new possibilities for the development of highly sensitive electrochemical sensors by engineering the electrochemical surface before the modification of the working electrode surface with carbon black.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"176 ","pages":"Article 107932"},"PeriodicalIF":4.7,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143851758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A simple and effective catalyst recovery protocol for H2-PEMFCs 简单有效的 H2-PEMFC 催化剂回收方案

IF 4.7 3区工程技术 Q2 ELECTROCHEMISTRY

Electrochemistry Communications

Pub Date : 2025-04-10 DOI: 10.1016/j.elecom.2025.107929

Marc Ayoub , Rohit Rajendran Menon , Simon Thiele , Matthew Brodt

Catalyst degradation in the cathode electrode for H₂-PEM (hydrogen proton-exchange membrane) fuel cells is a crucial topic to tackle to achieve high durability and efficiency. Despite ongoing research, a concurrently fast, easy-to-adapt, and effective recovery protocol is still missing. In this study, we report a fast and easy-to-adapt recovery protocol that significantly mitigates the negative effects associated with catalyst degradation for the cathode electrode in H₂-PEMFCs. Following accelerated stress tests (AST) of 30,000-cycles, membrane-electrode assemblies (MEAs) using our new recovery protocol exhibit remarkable higher end-of-life performance compared to similar MEAs subjected to the same AST but utilizing the DOE-defined recovery protocol. The end-of-life differences for the new recovery protocol are over 100 % increase in power density at 0.6 V and around 26 % increase at peak power density. By analyzing performance, the Tafel slope, the electrochemical surface area (ECSA), and impedance data, the improvements are traced back to better catalyst recovery and thus improved performance at end-of-life.

{"title":"A simple and effective catalyst recovery protocol for H2-PEMFCs","authors":"Marc Ayoub , Rohit Rajendran Menon , Simon Thiele , Matthew Brodt","doi":"10.1016/j.elecom.2025.107929","DOIUrl":"10.1016/j.elecom.2025.107929","url":null,"abstract":"<div><div>Catalyst degradation in the cathode electrode for H<sub>2</sub>-PEM (hydrogen proton-exchange membrane) fuel cells is a crucial topic to tackle to achieve high durability and efficiency. Despite ongoing research, a concurrently fast, easy-to-adapt, and effective recovery protocol is still missing. In this study, we report a fast and easy-to-adapt recovery protocol that significantly mitigates the negative effects associated with catalyst degradation for the cathode electrode in H<sub>2</sub>-PEMFCs. Following accelerated stress tests (AST) of 30,000-cycles, membrane-electrode assemblies (MEAs) using our new recovery protocol exhibit remarkable higher end-of-life performance compared to similar MEAs subjected to the same AST but utilizing the DOE-defined recovery protocol. The end-of-life differences for the new recovery protocol are over 100 % increase in power density at 0.6 V and around 26 % increase at peak power density. By analyzing performance, the Tafel slope, the electrochemical surface area (ECSA), and impedance data, the improvements are traced back to better catalyst recovery and thus improved performance at end-of-life.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"176 ","pages":"Article 107929"},"PeriodicalIF":4.7,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143829948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synergistic effects of magnetic fields and flow velocity on hydrogen bubble dynamics in water electrolysis

IF 4.7 3区工程技术 Q2 ELECTROCHEMISTRY

Electrochemistry Communications

Pub Date : 2025-04-10 DOI: 10.1016/j.elecom.2025.107918

Jindong Sun , Caizhu Wang , Haoyu Wen , Qian Yin , Jiaci Fan

By systematically regulating the magnetic field intensity and electrolyte flow rate, this study investigates the coupling effects of magnetic fields and flow velocity on hydrogen bubble dynamics during water electrolysis. A model of hydrogen bubble dynamics was used to analyze nucleation, growth, and detachment mechanisms under magnetic-flow coupling, determining key parameters such as growth radius and detachment speed. The dynamic evolution of hydrogen bubbles was comprehensively analyzed under both static and dynamic flow conditions. Electrochemical measurements revealed that increasing the magnetic field intensity from 0 T to 0.3 T enhanced the current density by 9.61 % at 0 cm/s and 6.67 % at 1 cm/s flow rates. These results suggest that magnetic-flow coupling reduces concentration polarization and overpotential. However, the enhancement effect gradually diminished with increasing flow velocity. Visualization experiments further confirmed that the coupling between magnetic field and flow velocity significantly promoted bubble oscillation, coalescence, and detachment, thereby improving electrolysis performance.

{"title":"Synergistic effects of magnetic fields and flow velocity on hydrogen bubble dynamics in water electrolysis","authors":"Jindong Sun , Caizhu Wang , Haoyu Wen , Qian Yin , Jiaci Fan","doi":"10.1016/j.elecom.2025.107918","DOIUrl":"10.1016/j.elecom.2025.107918","url":null,"abstract":"<div><div>By systematically regulating the magnetic field intensity and electrolyte flow rate, this study investigates the coupling effects of magnetic fields and flow velocity on hydrogen bubble dynamics during water electrolysis. A model of hydrogen bubble dynamics was used to analyze nucleation, growth, and detachment mechanisms under magnetic-flow coupling, determining key parameters such as growth radius and detachment speed. The dynamic evolution of hydrogen bubbles was comprehensively analyzed under both static and dynamic flow conditions. Electrochemical measurements revealed that increasing the magnetic field intensity from 0 T to 0.3 T enhanced the current density by 9.61 % at 0 cm/s and 6.67 % at 1 cm/s flow rates. These results suggest that magnetic-flow coupling reduces concentration polarization and overpotential. However, the enhancement effect gradually diminished with increasing flow velocity. Visualization experiments further confirmed that the coupling between magnetic field and flow velocity significantly promoted bubble oscillation, coalescence, and detachment, thereby improving electrolysis performance.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"176 ","pages":"Article 107918"},"PeriodicalIF":4.7,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143838811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Insight into structural, Opto-electronic and elastic properties of lead-free double perovskites Cs2TlInX6 (X = Cl, Br and I) for optoelectronic applications: A first principles calculations 深入研究用于光电应用的无铅双包晶石 Cs2TlInX6（X = Cl、Br 和 I）的结构、光电和弹性特性：第一原理计算

IF 4.7 3区工程技术 Q2 ELECTROCHEMISTRY

Electrochemistry Communications

Pub Date : 2025-04-10 DOI: 10.1016/j.elecom.2025.107930

Nimra Ehsan , Tasawer Shahzad Ahmad , Mian HR Mahmood , Salhah Hamed Alrefaee , Naseem Akhter , Tatyana Orlova , Vineet Tirth , Ali Algahtani , Amnah Mohammed Alsuhaibani , Moamen S. Refat , Abid Zaman

In recent years, lead-free double perovskites have gained attention due to their potential in optoelectronics. This study investigates the structural, electronic, mechanical and optical properties of Cs₂TlInX₆ (X = Cl, Br, I) using first-principles calculations. Structural optimizations reveal increasing lattice constants (11.05 Å −12.28 Å) with larger anions, while band structure analysis indicates indirect band gaps of 3.52 eV, 2.49 eV and 1.45 eV for Cl, Br, and I variants suitable for visible to ultra-visible applications. Mechanical analysis confirms structural stability with Cs₂TlInCl₆ exhibiting the highest bulk modulus (28.3 GPa) and Cs₂TlInI₆ demonstrating enhanced flexibility. Optical assessments show significant light absorption with Cs₂TlInI₆ possessing the highest dielectric constant (4.05). These findings highlight the potential of Cs₂TlInX₆ as stable, tunable, and highly absorptive materials, making them promising candidates for next-generation photovoltaic and optoelectronic applications.

{"title":"Insight into structural, Opto-electronic and elastic properties of lead-free double perovskites Cs2TlInX6 (X = Cl, Br and I) for optoelectronic applications: A first principles calculations","authors":"Nimra Ehsan , Tasawer Shahzad Ahmad , Mian HR Mahmood , Salhah Hamed Alrefaee , Naseem Akhter , Tatyana Orlova , Vineet Tirth , Ali Algahtani , Amnah Mohammed Alsuhaibani , Moamen S. Refat , Abid Zaman","doi":"10.1016/j.elecom.2025.107930","DOIUrl":"10.1016/j.elecom.2025.107930","url":null,"abstract":"<div><div>In recent years, lead-free double perovskites have gained attention due to their potential in optoelectronics. This study investigates the structural, electronic, mechanical and optical properties of Cs<sub>2</sub>TlInX<sub>6</sub> (X = Cl, Br, I) using first-principles calculations. Structural optimizations reveal increasing lattice constants (11.05 Å −12.28 Å) with larger anions, while band structure analysis indicates indirect band gaps of 3.52 eV, 2.49 eV and 1.45 eV for Cl, Br, and I variants suitable for visible to ultra-visible applications. Mechanical analysis confirms structural stability with Cs<sub>2</sub>TlInCl<sub>6</sub> exhibiting the highest bulk modulus (28.3 GPa) and Cs<sub>2</sub>TlInI<sub>6</sub> demonstrating enhanced flexibility. Optical assessments show significant light absorption with Cs<sub>2</sub>TlInI<sub>6</sub> possessing the highest dielectric constant (4.05). These findings highlight the potential of Cs<sub>2</sub>TlInX<sub>6</sub> as stable, tunable, and highly absorptive materials, making them promising candidates for next-generation photovoltaic and optoelectronic applications.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"176 ","pages":"Article 107930"},"PeriodicalIF":4.7,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143829949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Vanadium disulfide-modified lithium aluminum titanium phosphate/polymethyl methacrylate composite separator with hierarchical interface architecture for advanced lithium-sulfur batteries: A synergistic strategy for enhanced electrochemical performance and interfacial stability

IF 4.7 3区工程技术 Q2 ELECTROCHEMISTRY

Electrochemistry Communications

Pub Date : 2025-04-08 DOI: 10.1016/j.elecom.2025.107926

PeiHua Wang , Wendong Chen , Kai Qu

Lithium‑sulfur batteries have attracted significant attention as next-generation energy storage solutions due to their exceptional theoretical energy density (2600 Wh/kg) and economic viability. However, two fundamental challenges have hindered their practical application: the formation of lithium dendrites at the anode interface, which compromises safety and longevity, and the “shuttle effect” of polysulfide intermediates at the cathode, resulting in capacity deterioration and compromised cycling performance.

This study presents an innovative bifunctional separator design that simultaneously addresses these critical limitations through interface engineering. The separator architecture features a rationally designed vanadium disulfide (VS₂) composite layer functionalized with boron nitride nanosheets at the anode interface, which effectively suppresses dendrite nucleation and growth. Concurrently, at the cathode interface, a lithium aluminum titanium phosphate/polymethyl methacrylate/polyvinylidene fluoride (LATP/PMMA/PVDF) composite structure has been engineered to enable effective polysulfide confinement and enhance electrochemical reaction kinetics.

This bifunctional separator demonstrates excellent electrochemical performance, achieving a specific capacity of 677.8 mAh g⁻¹ at 2C rate while maintaining exceptional cycling stability over 800 cycles. These results represent a significant advancement toward the commercial realization of high-performance lithium‑sulfur batteries.

{"title":"Vanadium disulfide-modified lithium aluminum titanium phosphate/polymethyl methacrylate composite separator with hierarchical interface architecture for advanced lithium-sulfur batteries: A synergistic strategy for enhanced electrochemical performance and interfacial stability","authors":"PeiHua Wang , Wendong Chen , Kai Qu","doi":"10.1016/j.elecom.2025.107926","DOIUrl":"10.1016/j.elecom.2025.107926","url":null,"abstract":"<div><div>Lithium‑sulfur batteries have attracted significant attention as next-generation energy storage solutions due to their exceptional theoretical energy density (2600 Wh/kg) and economic viability. However, two fundamental challenges have hindered their practical application: the formation of lithium dendrites at the anode interface, which compromises safety and longevity, and the “shuttle effect” of polysulfide intermediates at the cathode, resulting in capacity deterioration and compromised cycling performance.</div><div>This study presents an innovative bifunctional separator design that simultaneously addresses these critical limitations through interface engineering. The separator architecture features a rationally designed vanadium disulfide (VS₂) composite layer functionalized with boron nitride nanosheets at the anode interface, which effectively suppresses dendrite nucleation and growth. Concurrently, at the cathode interface, a lithium aluminum titanium phosphate/polymethyl methacrylate/polyvinylidene fluoride (LATP/PMMA/PVDF) composite structure has been engineered to enable effective polysulfide confinement and enhance electrochemical reaction kinetics.</div><div>This bifunctional separator demonstrates excellent electrochemical performance, achieving a specific capacity of 677.8 mAh g<sup>−1</sup> at 2C rate while maintaining exceptional cycling stability over 800 cycles. These results represent a significant advancement toward the commercial realization of high-performance lithium‑sulfur batteries.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"175 ","pages":"Article 107926"},"PeriodicalIF":4.7,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143807009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electrochemical sensing platform based on the synergistic effects of MWCNTs and ZIF-L (Zn, Co) for voltammetric determination of dopamine in the presence of uric acid

IF 4.7 3区工程技术 Q2 ELECTROCHEMISTRY

Electrochemistry Communications

Pub Date : 2025-04-06 DOI: 10.1016/j.elecom.2025.107928

Ahlam Bazrafkan , Fariba Garkani Nejad , Reza Zaimbashi , Hadi Beitollahi

A facile, sensitive, and low-cost electrochemical sensing platform was designed by combining multi-walled carbon nanotubes (MWCNTs) with two-dimensional bimetallic zeolitic imidazolate framework with leaf-like morphology (ZIF-L (Zn, Co)) for voltammetric determination of dopamine and uric acid. The nanostructure of MWCNTs interwoven ZIF-L (Zn, Co) was prepared. The characterization methods such as FE-SEM, XRD, and EDX indicated the successful preparation of this nanostructure. Then, the application of prepared MWCNTs/ZIF-L (Zn, Co) nanocomposite in the modification of carbon paste electrode (CPE) for dopamine determination was investigated. The synergistic effects of ZIF-L (Zn, Co) and MWCNTs in MWCNTs/ZIF-L (Zn, Co)-modified CPE improved the effective surface area and electrical conductivity of the modified CPE, which enhanced the current responses at lower over-potentials towards dopamine determination compared to other CPEs, based on cyclic voltammetry (CV) studies. Under the optimal conditions, the MWCNTs/ZIF-L (Zn, Co)-based electrochemical sensor displayed a favorable response for dopamine determination with a broad linear detection range (0.001 to 900.0 μM) and limit of detection (LOD) (0.7 nM). Additionally, the MWCNTs/ZIF-L (Zn, Co)-modified CPE enabled determination of dopamine in the presence of uric acid with differentiable oxidation peak potentials. Finally, the MWCNTs/ZIF-L (Zn, Co)/CPE was applied for measuring the amounts of these species in urine sample and dopamine injection, and then the known concentrations of them were spiked into the samples, which findings showed good recoveries ranging from 97.1 % to 104.3 %.

{"title":"Electrochemical sensing platform based on the synergistic effects of MWCNTs and ZIF-L (Zn, Co) for voltammetric determination of dopamine in the presence of uric acid","authors":"Ahlam Bazrafkan , Fariba Garkani Nejad , Reza Zaimbashi , Hadi Beitollahi","doi":"10.1016/j.elecom.2025.107928","DOIUrl":"10.1016/j.elecom.2025.107928","url":null,"abstract":"<div><div>A facile, sensitive, and low-cost electrochemical sensing platform was designed by combining multi-walled carbon nanotubes (MWCNTs) with two-dimensional bimetallic zeolitic imidazolate framework with leaf-like morphology (ZIF-L (Zn, Co)) for voltammetric determination of dopamine and uric acid. The nanostructure of MWCNTs interwoven ZIF-L (Zn, Co) was prepared. The characterization methods such as FE-SEM, XRD, and EDX indicated the successful preparation of this nanostructure. Then, the application of prepared MWCNTs/ZIF-L (Zn, Co) nanocomposite in the modification of carbon paste electrode (CPE) for dopamine determination was investigated. The synergistic effects of ZIF-L (Zn, Co) and MWCNTs in MWCNTs/ZIF-L (Zn, Co)-modified CPE improved the effective surface area and electrical conductivity of the modified CPE, which enhanced the current responses at lower over-potentials towards dopamine determination compared to other CPEs, based on cyclic voltammetry (CV) studies. Under the optimal conditions, the MWCNTs/ZIF-L (Zn, Co)-based electrochemical sensor displayed a favorable response for dopamine determination with a broad linear detection range (0.001 to 900.0 μM) and limit of detection (LOD) (0.7 nM). Additionally, the MWCNTs/ZIF-L (Zn, Co)-modified CPE enabled determination of dopamine in the presence of uric acid with differentiable oxidation peak potentials. Finally, the MWCNTs/ZIF-L (Zn, Co)/CPE was applied for measuring the amounts of these species in urine sample and dopamine injection, and then the known concentrations of them were spiked into the samples, which findings showed good recoveries ranging from 97.1 % to 104.3 %.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"176 ","pages":"Article 107928"},"PeriodicalIF":4.7,"publicationDate":"2025-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143834066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Copper (II) anchored on guanidine-functionalized graphene oxide as a high-performance supercapacitor electrode: An experimental and theoretical investigation

IF 4.7 3区工程技术 Q2 ELECTROCHEMISTRY

Electrochemistry Communications

Pub Date : 2025-04-05 DOI: 10.1016/j.elecom.2025.107927

Samira Mohammadi , Seyed Morteza Mousavi-Khoshdel , Mohammad Ali Hedayati

This study investigates a low-cost and effective supercapacitor (SC) electrode material that represents an important step toward sustainable development. For this purpose, copper (II) anchored on guanidine-functionalized graphene oxide (GGO/Cu) was synthesized via a facile two-step route. Various analytical techniques, such as Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and elemental mapping, were utilized for phase and morphology investigation of the GGO/Cu. The electrochemical performance was assessed through cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge/discharge (GCD) in the 6 M KOH electrolyte. The GGO/Cu electrode demonstrated a high specific capacitance of 1224 F g⁻¹ in the potential window of 0 to 0.45 V at the current density of 2 A g⁻¹. The as-prepared electrode exhibited excellent cyclic stability and good capacitance retention of 68 % after 5500 cycles at the high current density of 20 A g⁻¹. Furthermore, for theoretical studies of GGO/Cu electrode, density functional theory (DFT) calculations were employed and the results suggested the improvement of the quantum capacitance (C_Q) and confirmed the experimental findings.

{"title":"Copper (II) anchored on guanidine-functionalized graphene oxide as a high-performance supercapacitor electrode: An experimental and theoretical investigation","authors":"Samira Mohammadi , Seyed Morteza Mousavi-Khoshdel , Mohammad Ali Hedayati","doi":"10.1016/j.elecom.2025.107927","DOIUrl":"10.1016/j.elecom.2025.107927","url":null,"abstract":"<div><div>This study investigates a low-cost and effective supercapacitor (SC) electrode material that represents an important step toward sustainable development. For this purpose, copper (II) anchored on guanidine-functionalized graphene oxide (GGO/Cu) was synthesized via a facile two-step route. Various analytical techniques, such as Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and elemental mapping, were utilized for phase and morphology investigation of the GGO/Cu. The electrochemical performance was assessed through cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge/discharge (GCD) in the 6 M KOH electrolyte. The GGO/Cu electrode demonstrated a high specific capacitance of 1224 F g<sup>−1</sup> in the potential window of 0 to 0.45 V at the current density of 2 A g<sup>−1</sup>. The as-prepared electrode exhibited excellent cyclic stability and good capacitance retention of 68 % after 5500 cycles at the high current density of 20 A g<sup>−1</sup>. Furthermore, for theoretical studies of GGO/Cu electrode, density functional theory (DFT) calculations were employed and the results suggested the improvement of the quantum capacitance (C<sub>Q</sub>) and confirmed the experimental findings.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"175 ","pages":"Article 107927"},"PeriodicalIF":4.7,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143807035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0