Pub Date : 2026-02-09DOI: 10.1016/j.electacta.2026.148386
Pengfa Li, Jie Yang, Xiaoguang Li, Cunjing Wang, Zhihua Ma, Quanzhou Du, Jiao Guo, Xiaowei Guo, Liujie Wang
Lithium-O2 batteries (LOBs) are considered potential energy storage systems, given their very high theoretical energy density. Nevertheless, the sluggish kinetics of the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) may lead to elevated overpotentials and diminished cycle stability. In this research, composite heterostructured Co3O4@CeO2 hollow nanospheres (Co3O4@CeO2 HNs) were prepared using a convenient hydrothermal approach, and then subjected to an annealing step, which exhibited good performance as a bi-functional catalyst for LOBs. The heterostructured hollow nanospheres provided an extensive catalytic surface to facilitate reaction kinetics. In addition, benefitting from the interfacial electron rearrangement of Co3O4@CeO2 heterostructure, the synergistic interaction can be contributed to ameliorate the chemisorption of intermediates and decrease the discharge and charge overpotentials, as validated-by density functional theory (DFT) calculations and experimental tests. Consequently, the assembled LOBs exhibited a narrow voltage gap (1.02 V at a middle capacity of 500 mAh g-1), an enhanced discharge capacity of 8988.8 mAh g-1, and cycling stability over 50 cycles at a controlled capacity of 500 mAh g-1. Notably, the Co3O4@CeO2 HNs exhibited superior electrocatalytic activity than the individual Co3O4 nanospheres (Co3O4 Ns) and CeO2 nanospheres (CeO2 Ns). Overall, this work presents an innovative methodology for designing heterojunctions to improve the electrocatalytic performance of LOBs.
锂- o2电池（lob）被认为是潜在的能量存储系统，因为它们具有非常高的理论能量密度。然而，析氧反应（OER）和氧还原反应（ORR）的缓慢动力学可能导致过电位升高和循环稳定性降低。本研究采用水热法制备了复合异质结构Co3O4@CeO2空心纳米球（Co3O4@CeO2 HNs），并对其进行了退火处理，获得了良好的双功能lob催化剂性能。异质结构的空心纳米球提供了广泛的催化表面，以促进反应动力学。此外，利用Co3O4@CeO2异质结构的界面电子重排，协同作用可以改善中间体的化学吸附，降低放电和充电过电位，密度泛函理论（DFT）计算和实验测试验证了这一点。结果表明，组装的lob具有较窄的电压间隙（中等容量为500 mAh g-1时为1.02 V），增强的放电容量为8988.8 mAh g-1，并且在500 mAh g-1的控制容量下循环超过50次的稳定性。值得注意的是，Co3O4@CeO2纳米微球的电催化活性优于单个Co3O4纳米微球（Co3O4 Ns）和CeO2纳米微球（CeO2 Ns）。总的来说，这项工作提出了一种创新的方法来设计异质结，以提高lob的电催化性能。
{"title":"Composite heterostructured Co3O4@CeO2 hollow nanospheres as an effective cathode catalyst for lithium-O2 battery","authors":"Pengfa Li, Jie Yang, Xiaoguang Li, Cunjing Wang, Zhihua Ma, Quanzhou Du, Jiao Guo, Xiaowei Guo, Liujie Wang","doi":"10.1016/j.electacta.2026.148386","DOIUrl":"https://doi.org/10.1016/j.electacta.2026.148386","url":null,"abstract":"Lithium-O<sub>2</sub> batteries (LOBs) are considered potential energy storage systems, given their very high theoretical energy density. Nevertheless, the sluggish kinetics of the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) may lead to elevated overpotentials and diminished cycle stability. In this research, composite heterostructured Co<sub>3</sub>O<sub>4</sub>@CeO<sub>2</sub> hollow nanospheres (Co<sub>3</sub>O<sub>4</sub>@CeO<sub>2</sub> HNs) were prepared using a convenient hydrothermal approach, and then subjected to an annealing step, which exhibited good performance as a bi-functional catalyst for LOBs. The heterostructured hollow nanospheres provided an extensive catalytic surface to facilitate reaction kinetics. In addition, benefitting from the interfacial electron rearrangement of Co<sub>3</sub>O<sub>4</sub>@CeO<sub>2</sub> heterostructure, the synergistic interaction can be contributed to ameliorate the chemisorption of intermediates and decrease the discharge and charge overpotentials, as validated-by density functional theory (DFT) calculations and experimental tests. Consequently, the assembled LOBs exhibited a narrow voltage gap (1.02 V at a middle capacity of 500 mAh g<sup>-1</sup>), an enhanced discharge capacity of 8988.8 mAh g<sup>-1</sup>, and cycling stability over 50 cycles at a controlled capacity of 500 mAh g<sup>-1</sup>. Notably, the Co<sub>3</sub>O<sub>4</sub>@CeO<sub>2</sub> HNs exhibited superior electrocatalytic activity than the individual Co<sub>3</sub>O<sub>4</sub> nanospheres (Co<sub>3</sub>O<sub>4</sub> Ns) and CeO<sub>2</sub> nanospheres (CeO<sub>2</sub> Ns). Overall, this work presents an innovative methodology for designing heterojunctions to improve the electrocatalytic performance of LOBs.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"313 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146138784","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}
To improve surface quality of additive manufactured tantalum, a novel electropolishing (EP) process was established by replacing traditional liquid corrosive acid with an alcohol-salt electrolyte containing inorganic solid sulfamic acid, NaCl, methanol, ethylene glycol and glycerol. The parameter range was preliminarily defined by studying anodic polarization behavior of a rotating disc Ta electrode, and the mechanism was explored. In the developed electrolyte, EP at 0.25 A·cm⁻², 300 rpm and 30 min reduced the roughness (Ra) by 67%. EP enhanced the hydrophobicity and compactness of the passivation film on the tantalum surface, thereby improving its electrochemical corrosion resistance. In the developed alkoxide electrolyte, EP of tantalum proceeds via a mucosal/salt film mechanism; tantalum ions generated by dissolution and chloride ions combine to form a colorless and transparent TaCl₅ sticky film covering the surface. This method achieves high-quality and smooth treatment of the surface of tantalum metal, featuring environmental friendliness and low material loss. It opens up a new path for the manufacturing of high-performance additive manufacturing tantalum components.
{"title":"High-Quality Additive Manufactured Tantalum via Advanced Electropolishing in Chloride-Containing Alcohol-Salt Electrolyte","authors":"Changbin Tang, Yu Yang, Jingang Tang, Jiayi Zhou, Juanqin Xue","doi":"10.1016/j.electacta.2026.148417","DOIUrl":"https://doi.org/10.1016/j.electacta.2026.148417","url":null,"abstract":"To improve surface quality of additive manufactured tantalum, a novel electropolishing (EP) process was established by replacing traditional liquid corrosive acid with an alcohol-salt electrolyte containing inorganic solid sulfamic acid, NaCl, methanol, ethylene glycol and glycerol. The parameter range was preliminarily defined by studying anodic polarization behavior of a rotating disc Ta electrode, and the mechanism was explored. In the developed electrolyte, EP at 0.25 A·cm⁻², 300 rpm and 30 min reduced the roughness (Ra) by 67%. EP enhanced the hydrophobicity and compactness of the passivation film on the tantalum surface, thereby improving its electrochemical corrosion resistance. In the developed alkoxide electrolyte, EP of tantalum proceeds via a mucosal/salt film mechanism; tantalum ions generated by dissolution and chloride ions combine to form a colorless and transparent TaCl₅ sticky film covering the surface. This method achieves high-quality and smooth treatment of the surface of tantalum metal, featuring environmental friendliness and low material loss. It opens up a new path for the manufacturing of high-performance additive manufacturing tantalum components.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"39 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146146616","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 : 2026-02-09DOI: 10.1016/j.electacta.2026.148426
Juliana M.S. de Jesus, Caroline de O. Carrilho, João P.C. Moura, Aline B. Trench, Caroline C. Augusto, Bruno L. Batista, Mauro C. dos Santos
The widespread presence of synthetic progestins, such as levonorgestrel (LNG) and gestodene (GES), in aquatic environments poses significant ecotoxicological risks due to their endocrine-disrupting properties. In this study, nano-octahedral magnetite (Fe3O4-NO) was synthesized via a hydrothermal route and incorporated into gas diffusion electrodes (GDEs) supported on Vulcan XC72 to enhance the in-situ electrogeneration of hydrogen peroxide (H2O2). High-resolution Transmission Electron Microscopy, X-ray diffraction, SEM, X-ray photoelectron spectroscopy, and contact angle measurements thoroughly characterized the physicochemical and morphological properties of the materials. 3% Fe3O4-NO/C provided a 2-fold increase on H2O2 selectivity in comparison with Vulcan XC72. Electrochemical performance was optimized using a 23 factorial design and principal component analysis (PCA), with current density, pH, and Na2SO4 concentration as variables. The optimized GDE (3% Fe3O4-NO/C) achieved a maximum H2O2 production of 0.44 ± 0.02 g L⁻¹ with a current efficiency of 43.1 ± 0.23% and a specific energy consumption of 0.012 ± 0.009 kWh g⁻¹. The electrode was further applied to the degradation of LNG and GES using solar and anodic-assisted electro-Fenton processes. Under optimal conditions, over 70 % removal of both progestins was achieved, with stable performance across three operational cycles. These findings demonstrate the potential of 3% Fe3O4-NO/C-GDEs as efficient, reusable cathodes for sustainable electrochemical advanced oxidation processes (EAOPs) in water treatment.
合成孕激素，如左炔诺孕酮（LNG）和孕酮（GES），由于其内分泌干扰特性，在水生环境中广泛存在，造成了重大的生态毒理学风险。本研究采用水热法合成纳米八面体磁铁矿（Fe3O4-NO），并将其掺入支撑在Vulcan XC72上的气体扩散电极（GDEs）中，以增强过氧化氢（H2O2）的原位发电能力。高分辨率透射电子显微镜、x射线衍射、扫描电镜、x射线光电子能谱和接触角测量彻底表征了材料的物理化学和形态特性。与Vulcan XC72相比，3% Fe3O4-NO/C的H2O2选择性提高了2倍。以电流密度、pH和Na2SO4浓度为变量，采用23因子设计和主成分分析（PCA）对电化学性能进行优化。优化后的GDE （3% Fe3O4-NO/C）的最大H2O2产量为0.44±0.02 g L -⁻，电流效率为43.1±0.23%，比能量消耗为0.012±0.009 kWh g -⁻。该电极进一步应用于太阳能和阳极辅助电fenton法降解LNG和GES。在最佳条件下，两种黄体酮的去除率均超过70%，并且在三个操作周期内性能稳定。这些发现证明了3% Fe3O4-NO/C-GDEs作为可持续电化学高级氧化过程（EAOPs）中高效、可重复使用的阴极在水处理中的潜力。
{"title":"Fe3O4 Nano-octahedra/Vulcan XC72: Optimization and Combination with Solar-Based Electro-Fenton for Progestins Degradation","authors":"Juliana M.S. de Jesus, Caroline de O. Carrilho, João P.C. Moura, Aline B. Trench, Caroline C. Augusto, Bruno L. Batista, Mauro C. dos Santos","doi":"10.1016/j.electacta.2026.148426","DOIUrl":"https://doi.org/10.1016/j.electacta.2026.148426","url":null,"abstract":"The widespread presence of synthetic progestins, such as levonorgestrel (LNG) and gestodene (GES), in aquatic environments poses significant ecotoxicological risks due to their endocrine-disrupting properties. In this study, nano-octahedral magnetite (Fe<ce:inf loc=\"post\">3</ce:inf>O<ce:inf loc=\"post\">4</ce:inf>-NO) was synthesized via a hydrothermal route and incorporated into gas diffusion electrodes (GDEs) supported on Vulcan XC72 to enhance the <ce:italic>in-situ</ce:italic> electrogeneration of hydrogen peroxide (H<ce:inf loc=\"post\">2</ce:inf>O<ce:inf loc=\"post\">2</ce:inf>). High-resolution Transmission Electron Microscopy, X-ray diffraction, SEM, X-ray photoelectron spectroscopy, and contact angle measurements thoroughly characterized the physicochemical and morphological properties of the materials. 3% Fe<ce:inf loc=\"post\">3</ce:inf>O<ce:inf loc=\"post\">4</ce:inf>-NO/C provided a 2-fold increase on H<ce:inf loc=\"post\">2</ce:inf>O<ce:inf loc=\"post\">2</ce:inf> selectivity in comparison with Vulcan XC72. Electrochemical performance was optimized using a 2<ce:sup loc=\"post\">3</ce:sup> factorial design and principal component analysis (PCA), with current density, pH, and Na<ce:inf loc=\"post\">2</ce:inf>SO<ce:inf loc=\"post\">4</ce:inf> concentration as variables. The optimized GDE (3% Fe<ce:inf loc=\"post\">3</ce:inf>O<ce:inf loc=\"post\">4</ce:inf>-NO/C) achieved a maximum H<ce:inf loc=\"post\">2</ce:inf>O<ce:inf loc=\"post\">2</ce:inf> production of 0.44 ± 0.02 g L⁻¹ with a current efficiency of 43.1 ± 0.23% and a specific energy consumption of 0.012 ± 0.009 kWh g⁻¹. The electrode was further applied to the degradation of LNG and GES using solar and anodic-assisted electro-Fenton processes. Under optimal conditions, over 70 % removal of both progestins was achieved, with stable performance across three operational cycles. These findings demonstrate the potential of 3% Fe<ce:inf loc=\"post\">3</ce:inf>O<ce:inf loc=\"post\">4</ce:inf>-NO/C-GDEs as efficient, reusable cathodes for sustainable electrochemical advanced oxidation processes (EAOPs) in water treatment.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"59 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146146611","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 : 2026-02-09DOI: 10.1016/j.electacta.2026.148410
Jiahao Sun, Xu Wang, Yang Li, Jinping Yuan, Yun Zou
The effects of homogenization treatment on the mechanical properties and corrosion behavior of an LA126 (Mg-12.31Li-5.62Al-0.14Y, wt.%) alloy were systematically investigated. The as-cast alloy was homogenized at 250 and 400°C for 1, 4, and 7 h, and its mechanical properties and corrosion behavior in 3.5 wt.% NaCl solution were evaluated. Homogenization at 400°C increased strength but reduced ductility, a trade-off primarily attributed to the precipitation of MgLiAl₂ within the β-Li matrix. While this intermetallic phase contributes to strengthening, its coarser morphology tends to induce local stress concentration, thereby compromising plasticity. In contrast, treatment at 250°C enhanced ductility with only a slight reduction in strength, mainly by alleviating casting-induced elemental segregation. Notably, the specimen homogenized at 400°C for 7 h exhibited superior corrosion resistance, characterized by a more noble corrosion potential (-1.571 V), a lower corrosion current density (5.11 × 10⁻⁵ A·cm⁻²), and the lowest mass-loss rate (0.67 mg·cm⁻²·d⁻¹). This enhancement is ascribed to the dissolution of anodic AlLi phases and improved microstructural uniformity, which effectively suppresses micro-galvanic coupling and localized corrosion.
{"title":"Homogenization-Induced Improvements in Mechanical and Corrosion Properties of Mg-12.31Li-5.62Al-0.14Y Alloy","authors":"Jiahao Sun, Xu Wang, Yang Li, Jinping Yuan, Yun Zou","doi":"10.1016/j.electacta.2026.148410","DOIUrl":"https://doi.org/10.1016/j.electacta.2026.148410","url":null,"abstract":"The effects of homogenization treatment on the mechanical properties and corrosion behavior of an LA126 (Mg-12.31Li-5.62Al-0.14Y, wt.%) alloy were systematically investigated. The as-cast alloy was homogenized at 250 and 400°C for 1, 4, and 7 h, and its mechanical properties and corrosion behavior in 3.5 wt.% NaCl solution were evaluated. Homogenization at 400°C increased strength but reduced ductility, a trade-off primarily attributed to the precipitation of MgLiAl₂ within the β-Li matrix. While this intermetallic phase contributes to strengthening, its coarser morphology tends to induce local stress concentration, thereby compromising plasticity. In contrast, treatment at 250°C enhanced ductility with only a slight reduction in strength, mainly by alleviating casting-induced elemental segregation. Notably, the specimen homogenized at 400°C for 7 h exhibited superior corrosion resistance, characterized by a more noble corrosion potential (-1.571 V), a lower corrosion current density (5.11 × 10⁻⁵ A·cm⁻²), and the lowest mass-loss rate (0.67 mg·cm⁻²·d⁻¹). This enhancement is ascribed to the dissolution of anodic AlLi phases and improved microstructural uniformity, which effectively suppresses micro-galvanic coupling and localized corrosion.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"93 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146146565","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 : 2026-02-09DOI: 10.1016/j.electacta.2026.148423
Clécia Andrade dos Santos, Matteo Miceli, Luciane Pimenta Cruz Romão, Maria V. Boldrin Zanoni, Siglinda Perathoner, Gabriele Centi, Claudio Ampelli
Finding a sustainable alternative to the energy-intensive Haber-Bosh process for ammonia (NH3) production remains a key challenge. In this paper, we explore the influence of GDL porosity on the NH3 formation rate, finding 38.4 µg h-1 cm-2 NH3 in the least porous and 282 µg h-1 cm-2 NH3 in the most porous. Furthermore, we report a photoelectrocatalytic (PEC) approach that achieves up to 90% Faradaic efficiency using MnFe2O4-based semiconductors. A graphene-MnFe2O4 photoelectrode achieves 292 µg h-1 cm-2 NH3 at low overpotential, -0.2 V vs Ag/AgCl/Cl-1 (3.0 M KCl). In contrast, an electrode without graphene achieves 48.8 µg h-1 cm-2 NH3, highlighting the key role of graphene. Furthermore, PEC technology demonstrates superior performance compared to photocatalytic and electrocatalytic modes using the same electrodes, highlighting the importance of rational device and electrode design. These results reinforce that high-efficiency N2 fixation depends on the interconnection between catalyst properties, electrode structure, and the type of photo/electrocatalytic technology, offering new perspectives for the development of scalable, solar-powered PEC systems for sustainable NH3 production.
寻找一种可持续的氨（NH3）生产的能源密集型Haber-Bosh工艺的替代品仍然是一个关键的挑战。在本文中，我们探索了GDL孔隙度对NH3生成速率的影响，发现最小孔隙度为38.4µg h-1 cm-2 NH3，最大孔隙度为282µg h-1 cm-2 NH3。此外，我们报告了一种光电催化（PEC）方法，该方法使用基于mnfe2o4的半导体实现了高达90%的法拉第效率。石墨烯- mnfe2o4光电极在低过电位，-0.2 V vs Ag/AgCl/Cl-1 （3.0 M KCl）下达到292µg h-1 cm-2 NH3。相比之下，没有石墨烯的电极可以达到48.8µg h-1 cm-2 NH3，突出了石墨烯的关键作用。此外，与使用相同电极的光催化和电催化模式相比，PEC技术表现出优越的性能，突出了合理的装置和电极设计的重要性。这些结果强调，高效的氮气固定取决于催化剂性质、电极结构和光/电催化技术之间的相互联系，为可扩展的太阳能PEC系统的发展提供了新的视角，以实现可持续的NH3生产。
{"title":"Discovery of the role of GDL porosity in direct N2 fixation to NH3 using enhanced MnFe2O4/graphene-based photoelectrocatalytic devices","authors":"Clécia Andrade dos Santos, Matteo Miceli, Luciane Pimenta Cruz Romão, Maria V. Boldrin Zanoni, Siglinda Perathoner, Gabriele Centi, Claudio Ampelli","doi":"10.1016/j.electacta.2026.148423","DOIUrl":"https://doi.org/10.1016/j.electacta.2026.148423","url":null,"abstract":"Finding a sustainable alternative to the energy-intensive Haber-Bosh process for ammonia (NH<ce:inf loc=\"post\">3</ce:inf>) production remains a key challenge. In this paper, we explore the influence of GDL porosity on the NH<ce:inf loc=\"post\">3</ce:inf> formation rate, finding 38.4 µg h<ce:sup loc=\"post\">-1</ce:sup> cm<ce:sup loc=\"post\">-2</ce:sup> NH<ce:inf loc=\"post\">3</ce:inf> in the least porous and 282 µg h<ce:sup loc=\"post\">-1</ce:sup> cm<ce:sup loc=\"post\">-2</ce:sup> NH<ce:inf loc=\"post\">3</ce:inf> in the most porous. Furthermore, we report a photoelectrocatalytic (PEC) approach that achieves up to 90% Faradaic efficiency using MnFe<ce:inf loc=\"post\">2</ce:inf>O<ce:inf loc=\"post\">4</ce:inf>-based semiconductors. A graphene-MnFe<ce:inf loc=\"post\">2</ce:inf>O<ce:inf loc=\"post\">4</ce:inf> photoelectrode achieves 292 µg h<ce:sup loc=\"post\">-1</ce:sup> cm<ce:sup loc=\"post\">-2</ce:sup> NH<ce:inf loc=\"post\">3</ce:inf> at low overpotential, -0.2 V vs Ag/AgCl/Cl<ce:sup loc=\"post\">-1</ce:sup> (3.0 M KCl). In contrast, an electrode without graphene achieves 48.8 µg h<ce:sup loc=\"post\">-1</ce:sup> cm<ce:sup loc=\"post\">-2</ce:sup> NH<ce:inf loc=\"post\">3</ce:inf>, highlighting the key role of graphene. Furthermore, PEC technology demonstrates superior performance compared to photocatalytic and electrocatalytic modes using the same electrodes, highlighting the importance of rational device and electrode design. These results reinforce that high-efficiency N<ce:inf loc=\"post\">2</ce:inf> fixation depends on the interconnection between catalyst properties, electrode structure, and the type of photo/electrocatalytic technology, offering new perspectives for the development of scalable, solar-powered PEC systems for sustainable NH<ce:inf loc=\"post\">3</ce:inf> production.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"100 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146146614","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 : 2026-02-08DOI: 10.1016/j.electacta.2026.148409
Detao Liu, Yanhai Cheng, Wang Liu, Yunfei Wang, Hao Chen, Jiali Zhou, Jinwen Deng, Jiaye Geng, Kun Ma, Jinyong Yang, Korzhyk Volodymyr, Stykhliak Petro
This study investigated the dynamic corrosion behavior of 27SiMn hydraulic support steel in the mine water using electrochemical noise monitoring (EN) combined with potentiodynamic polarization curves (PPCs) and Mott–Schottky (M–S) analysis. To correlate EN signals with corrosion mechanisms, the electrochemical current noise (ECN) data were processed by Hilbert–Huang transform, shot noise analysis, and recurrence quantification analysis (RQA). The results show that the corrosion process of 27SiMn steel exhibits three distinct stages during the spraying experiments. From the 1st to 4th cycle, the Hilbert spectrum displays dense, high–frequency, and aperiodic transient signals corresponding to metastable pitting. Concurrently, the steel exhibits increasing pitting susceptibility and p-type semiconductor behavior with high defect density. By the 5th cycle, the ECN transient signal significantly decreases, while RQA parameters increase markedly, indicating that the corrosion signal stabilizes and exhibits periodic characteristics. Meanwhile, the semiconductor behavior of 27SiM steel from p–type to n–p–type, due to the formation of complete corrosion product layers composed of Fe₂O₃, Fe₃O₄, and Mn₃O₄. During the 6th and 7th cycles, the Hilbert spectrum again shows clusters of high-density random transient signals, accompanied by a sharp decline in RQA parameters and a reversion to a p-type semiconductor state with high defect density.
{"title":"Monitoring the corrosion behavior of hydraulic support columns in mine water via electrochemical noise measurement","authors":"Detao Liu, Yanhai Cheng, Wang Liu, Yunfei Wang, Hao Chen, Jiali Zhou, Jinwen Deng, Jiaye Geng, Kun Ma, Jinyong Yang, Korzhyk Volodymyr, Stykhliak Petro","doi":"10.1016/j.electacta.2026.148409","DOIUrl":"https://doi.org/10.1016/j.electacta.2026.148409","url":null,"abstract":"This study investigated the dynamic corrosion behavior of 27SiMn hydraulic support steel in the mine water using electrochemical noise monitoring (EN) combined with potentiodynamic polarization curves (PPCs) and Mott–Schottky (M–S) analysis. To correlate EN signals with corrosion mechanisms, the electrochemical current noise (ECN) data were processed by Hilbert–Huang transform, shot noise analysis, and recurrence quantification analysis (RQA). The results show that the corrosion process of 27SiMn steel exhibits three distinct stages during the spraying experiments. From the 1st to 4th cycle, the Hilbert spectrum displays dense, high–frequency, and aperiodic transient signals corresponding to metastable pitting. Concurrently, the steel exhibits increasing pitting susceptibility and p-type semiconductor behavior with high defect density. By the 5th cycle, the ECN transient signal significantly decreases, while RQA parameters increase markedly, indicating that the corrosion signal stabilizes and exhibits periodic characteristics. Meanwhile, the semiconductor behavior of 27SiM steel from p–type to n–p–type, due to the formation of complete corrosion product layers composed of Fe₂O₃, Fe₃O₄, and Mn₃O₄. During the 6th and 7th cycles, the Hilbert spectrum again shows clusters of high-density random transient signals, accompanied by a sharp decline in RQA parameters and a reversion to a p-type semiconductor state with high defect density.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"109 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2026-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146135485","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}
Mg anodes undergo severe corrosion in chloride-containing electrolytes, limiting their stability and utilization in Mg-air batteries. Herein, the effect of molecular chain length on the inhibition performance of carboxylates is systematically investigated by comparing propionic acid (PA) with polyacrylic acid (PAA) of two different molecular weights (PAA-2000 and PAA-100000) under rigorously controlled carboxylate group concentration. Electrochemical tests and hydrogen evolution measurements show that PAA-2000 yields the lowest hydrogen evolution rate and the highest polarization resistance among the tested systems. Surface analyses reveal that PAA-2000 forms a compact adsorption layer that reduces the exposure of bare Mg surface and suppresses corrosion product formation. Molecular dynamics simulations rationalize these observations: while all carboxylates adsorb via carboxylate-Mg coordination, PA provides insufficient surface coverage, and PAA-100000 exhibits inefficient adsorption due to chain curling and tail extension. In contrast, the moderate chain length of PAA-2000 enables optimal surface coverage and dense interfacial packing, thereby regulating interfacial transport and corrosion kinetics. This work establishes molecular-level design principles for carboxylate-based polymeric corrosion inhibitors on Mg in chloride-containing electrolytes, based on the balance between chain flexibility and surface anchoring.
{"title":"Chain-Length-Driven Differences in Carboxylate Adsorption Layers Governing Corrosion Protection of Mg Anodes in Mg-Air Batteries","authors":"Hui Miao, Yi-Nuo Ding, Yuan Gao, Yuan-Xi Liu, Fen Zhang, Chen-Bao Liu, Lan-Yue Cui, Shuo-Qi Li","doi":"10.1016/j.electacta.2026.148419","DOIUrl":"https://doi.org/10.1016/j.electacta.2026.148419","url":null,"abstract":"Mg anodes undergo severe corrosion in chloride-containing electrolytes, limiting their stability and utilization in Mg-air batteries. Herein, the effect of molecular chain length on the inhibition performance of carboxylates is systematically investigated by comparing propionic acid (PA) with polyacrylic acid (PAA) of two different molecular weights (PAA-2000 and PAA-100000) under rigorously controlled carboxylate group concentration. Electrochemical tests and hydrogen evolution measurements show that PAA-2000 yields the lowest hydrogen evolution rate and the highest polarization resistance among the tested systems. Surface analyses reveal that PAA-2000 forms a compact adsorption layer that reduces the exposure of bare Mg surface and suppresses corrosion product formation. Molecular dynamics simulations rationalize these observations: while all carboxylates adsorb via carboxylate-Mg coordination, PA provides insufficient surface coverage, and PAA-100000 exhibits inefficient adsorption due to chain curling and tail extension. In contrast, the moderate chain length of PAA-2000 enables optimal surface coverage and dense interfacial packing, thereby regulating interfacial transport and corrosion kinetics. This work establishes molecular-level design principles for carboxylate-based polymeric corrosion inhibitors on Mg in chloride-containing electrolytes, based on the balance between chain flexibility and surface anchoring.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"48 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2026-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146135579","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 : 2026-02-07DOI: 10.1016/j.electacta.2026.148396
Ghulam Hussain, Asma Gilane, Manzar Sohail, Debbie S. Silvester
{"title":"Effect of Kinetic Reversibility on the Voltammetric Response in Room Temperature Ionic Liquids","authors":"Ghulam Hussain, Asma Gilane, Manzar Sohail, Debbie S. Silvester","doi":"10.1016/j.electacta.2026.148396","DOIUrl":"https://doi.org/10.1016/j.electacta.2026.148396","url":null,"abstract":"","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"311 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2026-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146135100","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}
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