Pub Date : 2025-12-18DOI: 10.1016/j.electacta.2025.148022
Desmond Kai Xiang Teo, Tomas Maul, Michelle Tien Tien Tan
{"title":"Overcoming Small Dataset Issues for Predictive Modelling of Electrochemical Biosensor Data with Synthetic Data Generation","authors":"Desmond Kai Xiang Teo, Tomas Maul, Michelle Tien Tien Tan","doi":"10.1016/j.electacta.2025.148022","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.148022","url":null,"abstract":"","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"35 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145785396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-18DOI: 10.1016/j.electacta.2025.148034
A. Kalaiselvi, N. Durga Sri, T. Maiyalagan
{"title":"Synergistic coupling of Iron doped Co-BTC nanospheres with nitrogen and sulphur co-doped reduced graphene oxide as electrocatalyst for efficient oxygen evolution reaction in alkaline medium","authors":"A. Kalaiselvi, N. Durga Sri, T. Maiyalagan","doi":"10.1016/j.electacta.2025.148034","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.148034","url":null,"abstract":"","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"19 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145785402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-17DOI: 10.1016/j.electacta.2025.148032
Bo Wang, Yizhuo Cui, Siyu Wu, Zhaojin Li, Huilan Sun, Qujiang Sun, Ranran Li, Di Zhang, Qiujun Wang, Fei Yuan
Potassium-selenium (K-Se) batteries have emerged as the most promising alternatives to lithium-ion energy storage technologies due to their high energy density and cost-effectiveness. However, active Se peeling off from the carbon matrix upon repeated cycling will cause rapid capacity attenuation, leading to a poor cycling lifespan. Herein, a three-dimensional interconnected porous Se/C hybrid material (denoted as Se/TDOC) is constructed with the assistance of NaHCO3 template. Various characterizations demonstrate that the use of NaHCO3 can effectively regulate the pore structure of carbon matrix, resulting in numerous Se species confined with pore channels. Moreover, during the pore regulation process caused by NaHCO3, abundant carbonate groups can be introduced, and as a result these carbonate groups can tightly anchor Se species via chemical bonding, namely Se-C/Se-O bonds. As such, a large number of active Se molecules can precipitate electrochemical reaction without peeling off from the carbon matrix. The optimized sample achieves a high capacity of 435.9 mAh·g-1 at 200 mA·g-1 when used as the cathode. Moreover, it demonstrates remarkable long-term stability by enduring over 2000 cycles even at a high current rate of 2 A·g-1.
钾硒(K-Se)电池因其高能量密度和成本效益而成为锂离子储能技术最有前途的替代品。然而,在重复循环时,从碳基体上剥离的活性硒会导致容量迅速衰减,导致循环寿命较差。本文在NaHCO3模板的辅助下,构建了三维互连多孔Se/C杂化材料(记为Se/TDOC)。各种表征表明,使用NaHCO3可以有效地调节碳基体的孔隙结构,导致大量的Se物种被孔隙通道限制。此外,在NaHCO3引起的孔隙调节过程中,可以引入丰富的碳酸盐基团,这些碳酸盐基团可以通过化学键,即Se- c /Se- o键,牢牢地锚定Se种。因此,大量的活性Se分子可以在不脱离碳基体的情况下析出电化学反应。优化后的样品在200 mA·g-1时可获得435.9 mAh·g-1的高容量。此外,即使在2 a·g-1的高电流速率下,它也能持续2000多次循环,表现出显著的长期稳定性。
{"title":"Multiple functional groups anchored Se species prolong long cycling stability for K-Se batteries","authors":"Bo Wang, Yizhuo Cui, Siyu Wu, Zhaojin Li, Huilan Sun, Qujiang Sun, Ranran Li, Di Zhang, Qiujun Wang, Fei Yuan","doi":"10.1016/j.electacta.2025.148032","DOIUrl":"10.1016/j.electacta.2025.148032","url":null,"abstract":"<div><div>Potassium-selenium (K-Se) batteries have emerged as the most promising alternatives to lithium-ion energy storage technologies due to their high energy density and cost-effectiveness. However, active Se peeling off from the carbon matrix upon repeated cycling will cause rapid capacity attenuation, leading to a poor cycling lifespan. Herein, a three-dimensional interconnected porous Se/C hybrid material (denoted as Se/TDOC) is constructed with the assistance of NaHCO<sub>3</sub> template. Various characterizations demonstrate that the use of NaHCO<sub>3</sub> can effectively regulate the pore structure of carbon matrix, resulting in numerous Se species confined with pore channels. Moreover, during the pore regulation process caused by NaHCO<sub>3</sub>, abundant carbonate groups can be introduced, and as a result these carbonate groups can tightly anchor Se species via chemical bonding, namely Se-C/Se-O bonds. As such, a large number of active Se molecules can precipitate electrochemical reaction without peeling off from the carbon matrix. The optimized sample achieves a high capacity of 435.9 mAh·g<sup>-1</sup> at 200 mA·g<sup>-1</sup> when used as the cathode. Moreover, it demonstrates remarkable long-term stability by enduring over 2000 cycles even at a high current rate of 2 A·g<sup>-1</sup>.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"549 ","pages":"Article 148032"},"PeriodicalIF":5.6,"publicationDate":"2025-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145789047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-17DOI: 10.1016/j.electacta.2025.148020
Amir Abbas Nazari, Mahdi Khatibi, Seyed Nezameddin Ashrafizadeh
Global water scarcity continues to drive the development of high-efficiency desalination technologies, yet many existing approaches remain energy-intensive and environmentally burdensome. These challenges motivate the exploration of nanoscale ion-selective systems capable of achieving strong ion rejection with minimal resource consumption. Here, we employ coupled Poisson–Nernst–Planck and Navier–Stokes simulations to investigate the desalination behavior of cylindrical (Type 1) and hourglass (Type 2) nanochannels coated with bipolar pH-responsive weak polyelectrolyte layers (PEL). The system is evaluated under three driving-force scenarios—pressure-driven, voltage-driven, and combined pressure–voltage operation—using monovalent electrolytes (KCl, NaCl, and KNO₃). The combined mode yields the highest salt rejection by enhancing electroosmotic transport while suppressing backflow. The hourglass geometry consistently outperforms the cylindrical channel, delivering at least 10 % higher rejection and reaching nearly 100 % removal under optimal conditions. Increasing the salt concentration from 1 to 10 mM decreases rejection (from 88.0 % to 61.0 % in Type 1 and from 96.2 % to 82.2 % in Type 2) and reduces water flux, with stronger effects for ions with larger hydration radii. Enhancing pH (from 5 to 9) and increasing PEL charge density (from 0 to 100 mol·m⁻³) significantly improve rejection—exceeding 90 % at optimal pH and reaching 96 % at the highest charge density—while altering water flux by <0.2 LMH. Applied pressure substantially increases pure water flux (from 1 to 3 LMH) but has minimal influence on rejection in the cylindrical channel. Conductivity–selectivity analysis confirms that the hourglass nanochannel achieves a more favorable transport trade-off, demonstrating the importance of geometry–charge coupling in designing highly efficient nanofluidic desalination systems.
{"title":"Synergistic role of geometry and surface charge in bipolar nanochannels for efficient desalination","authors":"Amir Abbas Nazari, Mahdi Khatibi, Seyed Nezameddin Ashrafizadeh","doi":"10.1016/j.electacta.2025.148020","DOIUrl":"10.1016/j.electacta.2025.148020","url":null,"abstract":"<div><div>Global water scarcity continues to drive the development of high-efficiency desalination technologies, yet many existing approaches remain energy-intensive and environmentally burdensome. These challenges motivate the exploration of nanoscale ion-selective systems capable of achieving strong ion rejection with minimal resource consumption. Here, we employ coupled Poisson–Nernst–Planck and Navier–Stokes simulations to investigate the desalination behavior of cylindrical (Type 1) and hourglass (Type 2) nanochannels coated with bipolar pH-responsive weak polyelectrolyte layers (PEL). The system is evaluated under three driving-force scenarios—pressure-driven, voltage-driven, and combined pressure–voltage operation—using monovalent electrolytes (KCl, NaCl, and KNO₃). The combined mode yields the highest salt rejection by enhancing electroosmotic transport while suppressing backflow. The hourglass geometry consistently outperforms the cylindrical channel, delivering at least 10 % higher rejection and reaching nearly 100 % removal under optimal conditions. Increasing the salt concentration from 1 to 10 mM decreases rejection (from 88.0 % to 61.0 % in Type 1 and from 96.2 % to 82.2 % in Type 2) and reduces water flux, with stronger effects for ions with larger hydration radii. Enhancing pH (from 5 to 9) and increasing PEL charge density (from 0 to 100 mol·m⁻³) significantly improve rejection—exceeding 90 % at optimal pH and reaching 96 % at the highest charge density—while altering water flux by <0.2 LMH. Applied pressure substantially increases pure water flux (from 1 to 3 LMH) but has minimal influence on rejection in the cylindrical channel. Conductivity–selectivity analysis confirms that the hourglass nanochannel achieves a more favorable transport trade-off, demonstrating the importance of geometry–charge coupling in designing highly efficient nanofluidic desalination systems.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"549 ","pages":"Article 148020"},"PeriodicalIF":5.6,"publicationDate":"2025-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145789049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-16DOI: 10.1016/j.electacta.2025.148026
Miha Hren, Tadeja Kosec, Andraž Legat
The aim of this study was to investigate the interaction between macrocell and microcell corrosion processes in a concrete column exposed to tidal conditions simulated by sinusoidal water-level changes. Macrocell corrosion currents were continuously measured for 19 weeks along the column height using coupled multi-electrodes (CMEs). Cumulative corrosion damage and the morphology of corrosion products were analysed using X-ray microCT, SEM, and Raman spectroscopy. The results showed complex patterns of anodic and cathodic activity, including sinusoidal and switch-like current behaviour, which depended on the water level position and exposure time. Corrosion typically initiated in the upper tidal zone, but the most corroded individual electrode was located near mid-tide. Damage distribution was influenced by both microcell and macrocell corrosion, where microcell corrosion was most prevalent in the high-tide area, whereas macrocell activity contributed to corrosion damage in several exposure zones. SEM and Raman analyses confirmed a correlation between corrosion type and corrosion product morphology. An attempt was made to explain the recognised corrosion patterns along the vertical position and the ratios between microcell and macrocell corrosion on individual electrodes were estimated. Additionally, new questions were raised that highlight the complexity of corrosion processes under tidal cycling and emphasise the need for further research into these phenomena.
{"title":"Evolution of macrocell and microcell corrosion in concrete subjected to simulated tiding","authors":"Miha Hren, Tadeja Kosec, Andraž Legat","doi":"10.1016/j.electacta.2025.148026","DOIUrl":"10.1016/j.electacta.2025.148026","url":null,"abstract":"<div><div>The aim of this study was to investigate the interaction between macrocell and microcell corrosion processes in a concrete column exposed to tidal conditions simulated by sinusoidal water-level changes. Macrocell corrosion currents were continuously measured for 19 weeks along the column height using coupled multi-electrodes (CMEs). Cumulative corrosion damage and the morphology of corrosion products were analysed using X-ray microCT, SEM, and Raman spectroscopy. The results showed complex patterns of anodic and cathodic activity, including sinusoidal and switch-like current behaviour, which depended on the water level position and exposure time. Corrosion typically initiated in the upper tidal zone, but the most corroded individual electrode was located near mid-tide. Damage distribution was influenced by both microcell and macrocell corrosion, where microcell corrosion was most prevalent in the high-tide area, whereas macrocell activity contributed to corrosion damage in several exposure zones. SEM and Raman analyses confirmed a correlation between corrosion type and corrosion product morphology. An attempt was made to explain the recognised corrosion patterns along the vertical position and the ratios between microcell and macrocell corrosion on individual electrodes were estimated. Additionally, new questions were raised that highlight the complexity of corrosion processes under tidal cycling and emphasise the need for further research into these phenomena.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"549 ","pages":"Article 148026"},"PeriodicalIF":5.6,"publicationDate":"2025-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145789103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-16DOI: 10.1016/j.electacta.2025.148027
Ehsan Khajavian , Yasaman Khoshraftaryazdi , Mohammad Hassan Farshidi , Ehsan Mohammadi Zahrani , Ali Davoodi
This study investigates the potential of high-speed friction stir processing (HS-FSP) to enhance the corrosion resistance and electrochemical stability of commercially pure titanium (CP-Ti) for biomedical applications. Unlike Ti-6Al-4 V alloys, which release toxic aluminum and vanadium ions, CP-Ti offers superior biocompatibility but suffers from lower mechanical and corrosion performance. To overcome these limitations, CP-Ti surfaces were modified using HS-FSP with varying pass numbers, and their microstructural, mechanical, and electrochemical properties were evaluated in Hank’s solution at 37 °C. HS-FSP induced severe grain refinement, reducing grain size from 52 µm² to 0.32 µm² after three passes, while microhardness increased from 241 Hv to 537 Hv. Electrochemical tests revealed a significant improvement in corrosion resistance; corrosion current density decreased from 0.25 µA·cm⁻² to 0.02 µA·cm⁻², and impedance rose from 317.81 kΩ·cm² to 811.27 kΩ·cm². Mott–Schottky analysis confirmed a reduction in donor density and an increase in passive film thickness, indicating fewer defects and enhanced barrier properties. These findings demonstrate that HS-FSP not only strengthens CP-Ti but also forms a dense, protective oxide layer, making it a viable, safer alternative to Ti-6Al-4 V for long-term implants. Beyond biomedical applications, this approach offers opportunities in aerospace, marine, and chemical industries where corrosion resistance and mechanical integrity are critical.
{"title":"Enhancing corrosion resistance of commercially pure titanium by high-speed friction stir processing for biomedical applications","authors":"Ehsan Khajavian , Yasaman Khoshraftaryazdi , Mohammad Hassan Farshidi , Ehsan Mohammadi Zahrani , Ali Davoodi","doi":"10.1016/j.electacta.2025.148027","DOIUrl":"10.1016/j.electacta.2025.148027","url":null,"abstract":"<div><div>This study investigates the potential of high-speed friction stir processing (HS-FSP) to enhance the corrosion resistance and electrochemical stability of commercially pure titanium (CP-Ti) for biomedical applications. Unlike Ti-6Al-4 V alloys, which release toxic aluminum and vanadium ions, CP-Ti offers superior biocompatibility but suffers from lower mechanical and corrosion performance. To overcome these limitations, CP-Ti surfaces were modified using HS-FSP with varying pass numbers, and their microstructural, mechanical, and electrochemical properties were evaluated in Hank’s solution at 37 °C. HS-FSP induced severe grain refinement, reducing grain size from 52 µm² to 0.32 µm² after three passes, while microhardness increased from 241 Hv to 537 Hv. Electrochemical tests revealed a significant improvement in corrosion resistance; corrosion current density decreased from 0.25 µA·cm⁻² to 0.02 µA·cm⁻², and impedance rose from 317.81 kΩ·cm² to 811.27 kΩ·cm². Mott–Schottky analysis confirmed a reduction in donor density and an increase in passive film thickness, indicating fewer defects and enhanced barrier properties. These findings demonstrate that HS-FSP not only strengthens CP-Ti but also forms a dense, protective oxide layer, making it a viable, safer alternative to Ti-6Al-4 V for long-term implants. Beyond biomedical applications, this approach offers opportunities in aerospace, marine, and chemical industries where corrosion resistance and mechanical integrity are critical.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"549 ","pages":"Article 148027"},"PeriodicalIF":5.6,"publicationDate":"2025-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145760269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}