Electrochimica Acta最新文献

Ni-P/NiOOH Heterointerface and Defect-Regulated ZIF-67-Derived Porous Nanosheet Electrodes for Photo-Assisted Supercapacitive Energy Storage 用于光辅助超级电容储能的Ni-P/NiOOH异质界面和缺陷调节的zif -67衍生多孔纳米片电极

IF 6.6 3区材料科学

Electrochimica Acta Pub Date : 2026-10-14 DOI: 10.1016/j.electacta.2026.150197

Haoyu Zhai, Chenghao Man, Qian Rong, Ting Zhu

{"title":"Ni-P/NiOOH Heterointerface and Defect-Regulated ZIF-67-Derived Porous Nanosheet Electrodes for Photo-Assisted Supercapacitive Energy Storage","authors":"Haoyu Zhai, Chenghao Man, Qian Rong, Ting Zhu","doi":"10.1016/j.electacta.2026.150197","DOIUrl":"https://doi.org/10.1016/j.electacta.2026.150197","url":null,"abstract":"Conventional supercapacitors are limited by incomplete active-site utilization and sluggish interfacial charge transfer. Photo-assisted energy storage offers a route to regulate these processes using photogenerated carriers. In this work, a self-supported CC@ZIF-67/Ni/P electrode was prepared by in situ growth of ZIF-67 on carbon cloth, followed by Ni incorporation and phosphorus-source regulation. The central design feature is a Ni-P/NiOOH heterointerface formed within an open porous nanosheet network. HRTEM and XPS provide local structural and surface-chemical evidence for this composite interface. The porous network improves electrolyte accessibility, and defect-related states may assist carrier trapping and migration; however, heterointerfacial coupling is proposed to play the principal role and may facilitate interfacial electron transfer and photogenerated-carrier separation. Under illumination, the electrode reaches an areal capacitance of 1868 mF·cm<ce:sup loc=\"post\">−2</ce:sup> at 10 mA·cm<ce:sup loc=\"post\">−2</ce:sup>, together with a lower apparent interfacial resistance and a reproducible light-on/light-off transient response. The illuminated electrode retains 16.9% of its initial capacitance after 10,000 cycles, identifying long-term durability as a remaining limitation. These results support further investigation of interfacial coupling in MOF-derived photo-assisted electrodes.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"73 1","pages":"150197"},"PeriodicalIF":6.6,"publicationDate":"2026-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149221592","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}

引用次数: 0

Low-potential Electrochemical Sensor based on Hollow Molybdenum Carbide/Carbon Spheres for Detection of Oxytetracycline in Tap Water and Milk 基于空心碳化钼/碳球的低电位电化学传感器检测自来水和牛奶中的土霉素

IF 6.6 3区材料科学

Electrochimica Acta Pub Date : 2026-10-14 DOI: 10.1016/j.electacta.2026.150211

Liyun Shi, Dongyang Wang, Ziyang Wang, Wenwen Wu, Caixia Zhu, Wei Shen, Hian Kee Lee, Sheng Tang

{"title":"Low-potential Electrochemical Sensor based on Hollow Molybdenum Carbide/Carbon Spheres for Detection of Oxytetracycline in Tap Water and Milk","authors":"Liyun Shi, Dongyang Wang, Ziyang Wang, Wenwen Wu, Caixia Zhu, Wei Shen, Hian Kee Lee, Sheng Tang","doi":"10.1016/j.electacta.2026.150211","DOIUrl":"https://doi.org/10.1016/j.electacta.2026.150211","url":null,"abstract":"Accurate and rapid detection of oxytetracycline (OTC) in real samples, which is one of the most used and typical tetracycline antibiotics, is of crucial importance for protecting ecological health and supporting effective environmental monitoring. However, achieving free-interference and detection of OTC is a formidable challenge. Herein, a high-performance and low potential electrochemical sensor (Mo<ce:inf loc=\"post\">2</ce:inf>C/GCE) based on hollow molybdenum carbide (Mo<ce:inf loc=\"post\">2</ce:inf>C)/carbon spheres modified glassy carbon electrode (GCE) is reported to achieve free-interference, accurate for detection of OTC. The hollow Mo<ce:inf loc=\"post\">2</ce:inf>C/carbon spheres not only exhibited enzyme like activity, along with a significantly higher specific surface area and a greater density of accessible active sites compared to conventional two-dimensional carbon-based materials. In addition, Mo<ce:inf loc=\"post\">2</ce:inf>C was subjected to high potential oxidation during electrocatalysis, resulting in the formation of numerous surface defects and carbonyl functional groups on its carbon material surface. These defects and carboxyl groups provide more electrochemical active sites and reduce the oxidation overpotential of OTC, facilitating the interface electron transfer. Thus, the electrochemical oxidation potential of OTC on Mo<ce:inf loc=\"post\">2</ce:inf>C/GCE decreased from 0.78 V to 0.64 V compared with the GCE. Mo<ce:inf loc=\"post\">2</ce:inf>C/GCE for the detection of OTC using amperometry analysis exhibited a wide linear range of 0.01∼2000 μM as well as a low limit of detection (LOD) of 0.01 μM. Ultimately, the developed sensor was demonstrated for measurement of OTC in tap water and milk at low potential. Considering the excellent analytical performance and of the prepared electrochemical sensor, its potential for detection of OTC in environmental monitoring and public health, is demonstrated.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"22 1","pages":"150211"},"PeriodicalIF":6.6,"publicationDate":"2026-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149221612","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}

引用次数: 0

A Three-Dimensional Multiscale Simulation Framework for Nickel-Tungsten Electrodeposition in Porous Electrodes 多孔电极中镍钨电沉积的三维多尺度模拟框架

IF 5.8 3区材料科学

Electrochimica Acta Pub Date : 2026-10-14 DOI: 10.1016/j.electacta.2026.150213

Parisa Molaeipourashka, Bart van den Bossche, Koen Delaere, Peter Meuris, Aliona Nicolenco, Uxua Huizi, Francisco Alcaide, Eva García-Lecina, Mats Meeusen, Annick Hubin, Mesfin Haile Mamme

{"title":"A Three-Dimensional Multiscale Simulation Framework for Nickel-Tungsten Electrodeposition in Porous Electrodes","authors":"Parisa Molaeipourashka, Bart van den Bossche, Koen Delaere, Peter Meuris, Aliona Nicolenco, Uxua Huizi, Francisco Alcaide, Eva García-Lecina, Mats Meeusen, Annick Hubin, Mesfin Haile Mamme","doi":"10.1016/j.electacta.2026.150213","DOIUrl":"10.1016/j.electacta.2026.150213","url":null,"abstract":"<div><div>Alloy electrodeposition within porous electrodes is governed by strongly coupled transport, kinetics, and geometry, yet these interactions remain poorly understood beyond simplified planar or two-dimensional descriptions. This study presents a three-dimensional multiscale simulation framework, combined with targeted experiments, to resolve the spatial distribution of current density, deposit thickness, and alloy composition during nickel-tungsten electrodeposition in porous carbon cloth. The simulation connects a macro-scale potential description of the electroplating cell to a micro-scale multi-ion transport and reaction formulation that explicitly captures competitive metal deposition within the fiber network. The simulations reveal how macroscopic current partitioning and local transport limitations jointly give rise to pronounced thickness and tungsten composition gradients throughout the porous architecture. Experimental electron microscopy and compositional analysis support these predicted spatial trends across length scales. By directly linking current distribution to local alloy formation in three dimensions, this work provides general insight into the fundamental mechanisms governing induced alloy co-deposition in porous electrodes, extending beyond the specific nickel-tungsten system.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"581 ","pages":"Article 150213"},"PeriodicalIF":5.8,"publicationDate":"2026-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149203323","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}

引用次数: 0

Metal-catalyzed Electrocatalytic Acetylene Semi-hydrogenation: from Mechanistic Insights to Performance Opportunities 金属催化的电催化乙炔半加氢：从机理洞察到性能机会

IF 6.6 3区材料科学

Electrochimica Acta Pub Date : 2026-10-13 DOI: 10.1016/j.electacta.2026.150205

Yulia V. Gyrdymova, Jian Zhang, Konstantin S. Rodygin

引用次数: 0

Calixarene-Regulated Ionomer Microenvironments for Enhanced Oxygen Transport in AEMFC Cathodes 杯芳烃调控的离子微环境增强了AEMFC阴极中的氧传输

IF 6.6 3区材料科学

Electrochimica Acta Pub Date : 2026-10-13 DOI: 10.1016/j.electacta.2026.150207

Xuanming Tai, Ning Wang, Wenqi Liu, Bo Pang, Xuemei Wu, Wanting Chen, Gaohong He

{"title":"Calixarene-Regulated Ionomer Microenvironments for Enhanced Oxygen Transport in AEMFC Cathodes","authors":"Xuanming Tai, Ning Wang, Wenqi Liu, Bo Pang, Xuemei Wu, Wanting Chen, Gaohong He","doi":"10.1016/j.electacta.2026.150207","DOIUrl":"https://doi.org/10.1016/j.electacta.2026.150207","url":null,"abstract":"Oxygen transport in cathode catalyst layers remains a critical limitation for anion exchange membrane fuel cells (AEMFCs), particularly under low Pt loading. Herein, we propose a molecular cavity engineering strategy by incorporating hydroxyl-rich calixarenes with different cavity sizes (PTBCX, X = 4, 6, and 8) into a polynorbornene-based anion exchange ionomer (QHP). PTBCX facilitates O<ce:inf loc=\"post\">2</ce:inf> transport through the hydrophobic cavity, while its lower-rim phenolic hydroxyl groups promote interconnected OH⁻ transport pathways, enabling synergistic regulation of O<ce:inf loc=\"post\">2</ce:inf> transport and OH⁻ conduction. PTBC6, with a moderate cavity size of 0.76 nm, attains the optimal balance between structural modulation and transport performance. At a loading of 15 wt%, PTBC6 increases the ionomer fractional free volume and O<ce:inf loc=\"post\">2</ce:inf> diffusion coefficient by 65% and 93%, respectively, and delivers a limiting current density of 5.63 mA cm<ce:sup loc=\"post\">-2</ce:sup>, achieving state-of-the-art performance among reported alkaline ORR systems. Furthermore, under a low cathode Pt loading of 0.1 mg<ce:inf loc=\"post\">Pt</ce:inf> cm<ce:sup loc=\"post\">-2</ce:sup>, the H<ce:inf loc=\"post\">2</ce:inf>/O<ce:inf loc=\"post\">2</ce:inf> single cell delivers a peak power density of 561.3 mW cm<ce:sup loc=\"post\">-2</ce:sup>, which is 75% higher than that of pristine QHP. These results demonstrate that calixarene-based molecular cavity engineering provides an effective strategy for enhancing mass transport in low-Pt AEMFC cathodes.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"50 1","pages":"150207"},"PeriodicalIF":6.6,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149221595","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}

引用次数: 0

Thermodynamic–kinetic–multiphysics theory of carbon steel corrosion accelerated by seawater microdroplets: Quantitative dissection from electrochemical potential gradient to radical depassivation 海水微滴加速碳钢腐蚀的热力学-动力学-多物理场理论：从电化学电位梯度到自由基脱钝化的定量剖析

IF 6.6 3区材料科学

Electrochimica Acta Pub Date : 2026-10-13 DOI: 10.1016/j.electacta.2026.150202

Xin Yuan, Zizhen Cui, Shuai Su, Hengyu Zhao

{"title":"Thermodynamic–kinetic–multiphysics theory of carbon steel corrosion accelerated by seawater microdroplets: Quantitative dissection from electrochemical potential gradient to radical depassivation","authors":"Xin Yuan, Zizhen Cui, Shuai Su, Hengyu Zhao","doi":"10.1016/j.electacta.2026.150202","DOIUrl":"https://doi.org/10.1016/j.electacta.2026.150202","url":null,"abstract":"Seawater microdroplets (10–40 μm) in the marine splash zone accelerate carbon-steel corrosion to about five times the bulk-immersion rate, with local enhancement up to 12.45-fold at the three-phase boundary, accompanied by reactive oxygen species (·OH, H₂O₂). A coupled thermodynamic–electrokinetic–homogeneous kinetic and two-dimensional transport theory is developed. The OH⁻ self-oxidation route is thermodynamically forbidden (ΔG=+221.9 kJ/mol), whereas the Fe-driven stepwise O₂ reduction chain is spontaneous (ΔG=−164.8 kJ/mol), identifying ROS as corrosion-chain intermediates. nM-level ·OH cannot sustain an electrode current and acts chemically through FeOOH depassivation. Mechanism decomposition assigns 70.3% of the 5.16-fold enhancement to classical thin-film transport and 29.7% to radical depassivation; a dimensionally closed six-species model and leave-one-out cross-validation (LOOCV, MAPE=7.3%, R²=0.98) and a parameter-free 2D thin-film simulation (contact-line/center=2.85×) agree with independent experiments.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"1 1","pages":"150202"},"PeriodicalIF":6.6,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149221596","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}

引用次数: 0

Understanding Temperature, Transient-Current, and Historical-State Effects in Dynamic Electrochemical Impedance Spectroscopy of Lithium-Ion Batteries 了解锂离子电池动态电化学阻抗谱中的温度、瞬变电流和历史状态效应

IF 6.6 3区材料科学

Electrochimica Acta Pub Date : 2026-10-13 DOI: 10.1016/j.electacta.2026.150208

Chaofei Lan, Shanpeng Pei, Yi Zhang, Jin Zhao, Xiaoyu An, Ziqi Zhang, Wei Huang, Songyan Chen

{"title":"Understanding Temperature, Transient-Current, and Historical-State Effects in Dynamic Electrochemical Impedance Spectroscopy of Lithium-Ion Batteries","authors":"Chaofei Lan, Shanpeng Pei, Yi Zhang, Jin Zhao, Xiaoyu An, Ziqi Zhang, Wei Huang, Songyan Chen","doi":"10.1016/j.electacta.2026.150208","DOIUrl":"https://doi.org/10.1016/j.electacta.2026.150208","url":null,"abstract":"Dynamic electrochemical impedance spectroscopy (DEIS) shows strong potential for online state estimation of lithium-ion batteries (LIBs), yet its practical application remains limited by the interplay among relaxation, temperature, transient operating conditions, and historical cell states. In this work, the differences between stationary electrochemical impedance spectroscopy (SEIS) and DEIS are systematically investigated using a single commercial 18650 cell. First, DEIS measured shortly after discharge is analyzed. Within the investigated post-discharge period and experimental resolution, temperature variation accounts for most of the observable impedance evolution, whereas an independent relaxation contribution is not resolved. The coupled effects of transient current and temperature on operando DEIS are then examined using a simplified characteristic-feature framework intended to approximately separate their contributions. In addition, SEIS hysteresis is observed, indicating that the impedance measured after a long rest depends not only on the present state of charge (SOC) but also on the preceding operating history. Accordingly, a normalization strategy based on the ratio of the dynamic impedance feature to its corresponding local SEIS reference is evaluated and produces more consistent qualitative trends across the tested historical conditions and SOC levels. These results provide a novel perspective on the effects of temperature, transient current, and historical state on DEIS, offer useful guidance for developing DEIS-based online state-estimation methods for LIBs, and establish a basis for further quantitative validation using additional cells and operating conditions.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"12 1","pages":"150208"},"PeriodicalIF":6.6,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149221597","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}

引用次数: 0

Surfactant-Mediated Regulation of Interlayer Spacing and Hierarchical Architecture in NiMn-LDH Nanoflowers for High-Performance Flexible Supercapacitors 表面活性剂介导的用于高性能柔性超级电容器的NiMn-LDH纳米花的层间距和层次结构调控

IF 6.6 3区材料科学

Electrochimica Acta Pub Date : 2026-10-12 DOI: 10.1016/j.electacta.2026.150189

Ziyun Zhang, Mingru Sun, Zichuan Liu, Lingli Cheng, Zheng Jiao

{"title":"Surfactant-Mediated Regulation of Interlayer Spacing and Hierarchical Architecture in NiMn-LDH Nanoflowers for High-Performance Flexible Supercapacitors","authors":"Ziyun Zhang, Mingru Sun, Zichuan Liu, Lingli Cheng, Zheng Jiao","doi":"10.1016/j.electacta.2026.150189","DOIUrl":"https://doi.org/10.1016/j.electacta.2026.150189","url":null,"abstract":"Multiscale structural regulation is critical for improving ion accessibility and redox utilization in layered double hydroxide (LDH) electrodes. Here, cetyltrimethylammonium bromide (CTAB) was introduced into a one-step hydrothermal process to simultaneously regulate the particle size and interlayer spacing of NiMn-LDH nanoflowers. Increasing the CTAB dosage reduced the particle diameter from approximately 1.5 µm to 266 nm while enlarging the interlayer spacing from 9.45 to 9.68 Å. The optimized NML-2C exhibited a core-shell nanoflower architecture, a BET surface area of 143.4 m<ce:sup loc=\"post\">2</ce:sup> g<ce:sup loc=\"post\">−1</ce:sup>, and an interlayer spacing of 9.60 Å, providing abundant accessible sites and shortened ion-transport pathways. Consequently, NML-2C delivered a specific capacity of 946.5 C g<ce:sup loc=\"post\">−1</ce:sup> at 1 A g<ce:sup loc=\"post\">−1</ce:sup> and retained 677.0 C g<ce:sup loc=\"post\">−1</ce:sup> at 20 A g<ce:sup loc=\"post\">−1</ce:sup>, with 87.5% capacity retention after 5500 cycles. Density functional theory calculations indicated that the enlarged interlayer spacing strengthens OH⁻ adsorption and facilitates interfacial Faradaic reactions. Moreover, the flexible asymmetric hybrid supercapacitor achieved an energy density of 51.0 Wh kg<ce:sup loc=\"post\">−1</ce:sup> at a power density of 800.2 W kg<ce:sup loc=\"post\">−1</ce:sup> and retained 88.4% capacitance after 12,000 cycles. These results demonstrate that surfactant-assisted simultaneous regulation of particle architecture and interlayer spacing provides an effective strategy for developing high-performance NiMn-LDH electrodes for flexible electrochemical energy-storage devices.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"44 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149221463","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}

引用次数: 0

Influence of bis(3-sulfopropyl) disulfide on the electrodeposition behavior and microstructure of Ni coatings from a sulfamate bath 双（3-磺基丙基）二硫化物对氨基磺酸盐镀液中镍镀层电沉积行为和微观结构的影响

IF 6.6 3区材料科学

Electrochimica Acta Pub Date : 2026-10-12 DOI: 10.1016/j.electacta.2026.150198

Wenchao Li, Hu Tian, Ying Jin, Boyuan Ran, Shilong Chen, Feifei Huang

{"title":"Influence of bis(3-sulfopropyl) disulfide on the electrodeposition behavior and microstructure of Ni coatings from a sulfamate bath","authors":"Wenchao Li, Hu Tian, Ying Jin, Boyuan Ran, Shilong Chen, Feifei Huang","doi":"10.1016/j.electacta.2026.150198","DOIUrl":"https://doi.org/10.1016/j.electacta.2026.150198","url":null,"abstract":"The effects of sodium bis(3-sulfopropyl) disulfide, disodium salt (SPS) on nickel coatings electrodeposited from a nickel-sulfamate bath were investigated by microstructural characterization and electrochemical measurements. The addition of 0.10 g·L⁻¹ SPS transformed the coating surface from a relatively flat morphology to a cauliflower-like structure and increased the surface roughness, while reducing the average grain size from 4.0 to 0.4 μm. Meanwhile, the compressive residual stress was relaxed from approximately −160 to −60 MPa. X-ray diffraction results showed that SPS suppressed the pronounced (200) texture of the additive-free coating and increased the relative contributions of the (111) and (220) orientations, resulting in a more balanced crystallographic orientation distribution. Electrochemically, SPS shifted the onset potential for Ni²⁺ reduction by approximately 0.10 V toward less-negative values and increased the cathodic current density by up to 2.8-fold at −0.80 V, while the current efficiency remained close to 100%. Analysis of the normalized chronoamperometric transients suggested that SPS shifted nickel deposition toward predominantly instantaneous nucleation at relatively low overpotentials. Anodic polarization and surface analyses further indicated that SPS increased the anodic current in the nominal passive-potential region and reduced the relative contribution of oxidized nickel species on the anode surface. These results suggest that SPS modifies both cathodic nucleation behavior and anodic surface oxidation, while rapid nucleation coupled with mass-transport-influenced growth contributes to grain refinement and residual-stress relaxation.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"44 1","pages":"150198"},"PeriodicalIF":6.6,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149221611","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}

引用次数: 0

Throat-gated ionic current rectification in soft-layer hourglass nanochannels 软层沙漏纳米通道喉门控离子电流整流

IF 6.6 3区材料科学

Electrochimica Acta Pub Date : 2026-10-03 DOI: 10.1016/j.electacta.2026.150146

Hooman Hadidi

{"title":"Throat-gated ionic current rectification in soft-layer hourglass nanochannels","authors":"Hooman Hadidi","doi":"10.1016/j.electacta.2026.150146","DOIUrl":"https://doi.org/10.1016/j.electacta.2026.150146","url":null,"abstract":"Hourglass nanochannels provide a confined throat where geometric focusing and soft fixed charge can interact strongly. However, the role of spatially patterned polyelectrolyte layers (PELs) in controlling transport through this junction remains insufficiently resolved. Here, ionic current rectification is investigated using coupled Poisson–Nernst–Planck and Stokes–Brinkman/Navier–Stokes simulations for uniform, convergent-only, and bipolar PEL architectures. The results show that the hourglass throat acts as a localized electrostatic–hydrodynamic gate. In the bipolar configuration, oppositely charged PEL domains form an internal soft junction that switches with voltage polarity between a strongly depleted, low-conductance state and an enriched, high-conductance state. This switching is traced to the coupled effects of concentration polarization, electrostatic selectivity, electric-field localization, and throat-focused electrohydrodynamic flow. The PEL fixed-charge density exhibits an optimum rather than a monotonic effect, yielding a peak rectification factor of approximately 1120 within the charge-density sweep at a bulk electrolyte concentration of 0.3 mol/m³ for the reference geometry with a convergent angle of 4.57°. The geometry provides an additional control mechanism: changing the convergent-section length can reverse the preferred transport direction. In a separate convergent-angle sweep conducted at a bulk electrolyte concentration of 10 mol/m³, decreasing the convergent angle from 20° to 4.57° increases the rectification factor from approximately 470 to 1630. These results establish the hourglass throat as a tunable soft junction for controlling both the magnitude and polarity of ionic current rectification.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"52 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2026-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149123858","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}

引用次数: 0