Electrochemistry Communications最新文献_第2页

Enhancing the performance of supercapacitor electrodes from corncob-derived 3D hierarchical porous carbon: Effects of N concentration 玉米棒子衍生的三维分层多孔碳增强超级电容器电极性能：N浓度的影响

IF 4.7 3区工程技术

Electrochemistry Communications Pub Date : 2025-04-21 DOI: 10.1016/j.elecom.2025.107940

J.C. Martínez-Loyola , M.A. Carrasco-Cordero , I.L. Alonso-Lemus , F.J. Rodríguez-Varela , S. Ravichandran , B. Escobar-Morales , Y.I. Vega-Cantú , F.J. Rodríguez-Macías

{"title":"Enhancing the performance of supercapacitor electrodes from corncob-derived 3D hierarchical porous carbon: Effects of N concentration","authors":"J.C. Martínez-Loyola , M.A. Carrasco-Cordero , I.L. Alonso-Lemus , F.J. Rodríguez-Varela , S. Ravichandran , B. Escobar-Morales , Y.I. Vega-Cantú , F.J. Rodríguez-Macías","doi":"10.1016/j.elecom.2025.107940","DOIUrl":"10.1016/j.elecom.2025.107940","url":null,"abstract":"<div><div>We report supercapacitors from hierarchical porous carbon nanostructures (HPCNs) by simple pyrolysis of corncob (CC), with urea doping providing performance comparable to the more common metal-doped electrodes. Via a systematic study of N doping, we establish for the first time that the types of nitrogen‑carbon species, which vary with the urea‑carbon ratio, affect electrode performance. The 1:3 ratio (CC<sub>3</sub>) gave a higher specific capacitance of 335 F g<sup>−1</sup> at 1 mV s<sup>−1</sup> in a three-electrode system, and 287 F g<sup>−1</sup> at 0.2 A g<sup>−1</sup> in a symmetric device. We achieved solution and transfer resistances lower than reported for other materials: R<sub>s</sub> = 0.20 Ω and R<sub>ct</sub> = 0.78 Ω respectively. We attribute the better performance of CC<sub>3</sub> to its specific N-doping, dominated by graphitic-N plus oxidized nitrogen and C–OH groups; showing also a larger carbon (002) interplanar distance (<em>d</em><sub>(002)</sub> = 0.392) and high specific surface area (1149 m<sup>2</sup> g<sup>−1</sup>). The assembled prototype delivers a good energy density of 9.96 Wh kg<sup>−1</sup> at 403.22 W kg<sup>−1</sup> and retains ca. 76 % capacity after 10,000 cycles. This work shows that studying doping concentrations is essential to design and produce highly efficient biomass-based electrodes for energy storage applications, using simple synthesis methods and readily available reagents.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"177 ","pages":"Article 107940"},"PeriodicalIF":4.7,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908142","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 performance and behavior of nickel pig Iron anodic electrolysis for enhanced sulfuric acid leaching 镍生铁阳极电解强化硫酸浸出的电化学性能及行为

IF 4.7 3区工程技术

Electrochemistry Communications Pub Date : 2025-04-18 DOI: 10.1016/j.elecom.2025.107937

Namhun Kwon , Myungsuk Kim , Soongju Oh , Jae Hong Shin , Kyoung-Tae Park

{"title":"Electrochemical performance and behavior of nickel pig Iron anodic electrolysis for enhanced sulfuric acid leaching","authors":"Namhun Kwon , Myungsuk Kim , Soongju Oh , Jae Hong Shin , Kyoung-Tae Park","doi":"10.1016/j.elecom.2025.107937","DOIUrl":"10.1016/j.elecom.2025.107937","url":null,"abstract":"<div><div>This study presents an innovative electrochemical method for producing ultra-fine Nickel Pig Iron (NPI) powders through anodically induced overpotential electrolysis, achieving a significantly high surface area and exceptional sulfuric acid leaching efficiency. Nickel, a critical material for energy applications, faces increasing supply constraints, leading to greater reliance on intermediates like nickel sulfate. Conventional high-pressure acid leaching (HPAL) processes, while effective, suffer from high operational costs and excessive acid waste generation. To address these challenges, this study employs anodic oxidation of NPI under high-voltage conditions (≥10 V), facilitating particle refinement and enhanced electrochemical reactivity. Electrochemical characterizations, including cyclic voltammetry, chronoamperometry, and Pourbaix diagram analysis, confirm the formation of oxidized Ni-rich phases at optimal voltage ranges with peak current exceeding 10 A. The resulting fine NPI powders exhibit a leaching efficiency surpassing 95 % in 2 mol/L sulfuric acid at ambient temperature and pressure, demonstrating their potential as a cost-effective alternative to HPAL. Further post-process evaluations reveal critical electrolysis parameters influencing oxidation behavior and leaching performance, providing key insights for optimizing nickel extraction via anodic electrolysis.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"177 ","pages":"Article 107937"},"PeriodicalIF":4.7,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143912534","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

Alcohol electrooxidation on three-component NiO/La2O3/MWCNTs catalyst for DAFC application 三组分NiO/La2O3/MWCNTs催化剂上醇电氧化DAFC的应用

IF 4.7 3区工程技术

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

Ali Ahmadi , Hadi Ebrahimifar , Mohammad Bagher Askari

{"title":"Alcohol electrooxidation on three-component NiO/La2O3/MWCNTs catalyst for DAFC application","authors":"Ali Ahmadi , Hadi Ebrahimifar , Mohammad Bagher Askari","doi":"10.1016/j.elecom.2025.107936","DOIUrl":"10.1016/j.elecom.2025.107936","url":null,"abstract":"<div><div>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 (La<sub>2</sub>O<sub>3</sub>) 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/La<sub>2</sub>O<sub>3</sub> and NiO/La<sub>2</sub>O<sub>3</sub>/MWCNTs catalysts was confirmed. The effect of adding carbon nanotubes to the NiO/La<sub>2</sub>O<sub>3</sub> double metal oxide structure on the methanol and ethanol oxidation reaction (MOR and EOR) was investigated. In MOR and EOR by NiO/La<sub>2</sub>O<sub>3</sub>/MWCNTs catalyst, the maximum current densities of 110.71 and 43.56 mA/cm<sup>2</sup> 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/ La<sub>2</sub>O<sub>3</sub> and NiO/La<sub>2</sub>O<sub>3</sub>/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.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"176 ","pages":"Article 107936"},"PeriodicalIF":4.7,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143842929","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

Ultrathin CoPt alloy films with fcc (111) orientation and perpendicular magnetic anisotropy fabricated by electrodeposition 采用电沉积法制备fcc（111）取向和垂直磁各向异性超薄CoPt合金薄膜

IF 4.7 3区工程技术

Electrochemistry Communications Pub Date : 2025-04-17 DOI: 10.1016/j.elecom.2025.107938

Daiki Araki , Yoshiaki Sonobe , Yukiko K. Takahashi , Takayuki Homma

{"title":"Ultrathin CoPt alloy films with fcc (111) orientation and perpendicular magnetic anisotropy fabricated by electrodeposition","authors":"Daiki Araki , Yoshiaki Sonobe , Yukiko K. Takahashi , Takayuki Homma","doi":"10.1016/j.elecom.2025.107938","DOIUrl":"10.1016/j.elecom.2025.107938","url":null,"abstract":"<div><div>In this study, ultrathin CoPt alloy films oriented along face-centered cubic (fcc) (111) with perpendicular magnetic anisotropy (PMA) are fabricated by electrodeposition at room temperature and normal pressure without annealing. By increasing the concentration of Pt ions in the electrolytes, initial nucleation of CoPt becomes fine, forming epitaxial CoPt alloy films oriented along fcc (111) to the film planes with very smooth surfaces (Arithmetic average roughness Ra ∼ 0.43 nm). The deposited CoPt films show the lower saturation magnetization (<em>M</em><sub>S</sub> ∼ 620 emu･cm<sup>−3</sup>) compared to conventional CoPt films with hexagonal close-packed (hcp) structures. The CoPt film with a thickness of 5 nm exhibits large PMA (anisotropy constant <em>K</em><sub>u</sub> ∼ 4.3 Merg･cm<sup>−3</sup>), coercivity (<em>H</em><sub>C</sub> ∼ 2.4 kOe), and nucleation field (<em>H</em><sub>n</sub> ∼ 2.0 kOe). The fabricated CoPt films contribute to the development of magnetic tunnel junctions with enhanced tunnel magnetoresistance effects and a next-generation magnetic memory with ultrahigh recording density.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"176 ","pages":"Article 107938"},"PeriodicalIF":4.7,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143863533","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

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 过度氧化电聚合聚（吡咯-1-丙酸）在丝网印刷石墨烯电极电化学传感器选择性检测多巴胺神经递质在去甲肾上腺素和血清素的存在

IF 4.7 3区工程技术

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

{"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 用聚磷酰胺薄膜钝化n-InP在液氨中的真实电容行为

IF 4.7 3区工程技术

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

Gianluca Visagli, Arnaud Etcheberry, Anne-Marie Gonçalves

{"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 炭黑在有序钛纳米管支架上作为下一代高敏感电极的智能纳米工程材料

IF 4.7 3区工程技术

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

{"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

Synergistic effects of magnetic fields and flow velocity on hydrogen bubble dynamics in water electrolysis 磁场和流速对电解氢泡动力学的协同效应

IF 4.7 3区工程技术

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

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

{"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

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

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

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

{"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

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

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

{"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