Electrochimica Acta最新文献_第7页

N, S Co-doped carbon-enhanced FeS2 yolk–shell structure: Overcoming volume expansion and polysulfide shuttle issues in sodium-ion battery anodes

IF 5.5 3区材料科学

Electrochimica Acta Pub Date : 2025-03-26 DOI: 10.1016/j.electacta.2025.146120

Dongming Qi , Yanshuang Meng , Qiang Xiang , Fuliang Zhu

{"title":"N, S Co-doped carbon-enhanced FeS2 yolk–shell structure: Overcoming volume expansion and polysulfide shuttle issues in sodium-ion battery anodes","authors":"Dongming Qi , Yanshuang Meng , Qiang Xiang , Fuliang Zhu","doi":"10.1016/j.electacta.2025.146120","DOIUrl":"10.1016/j.electacta.2025.146120","url":null,"abstract":"<div><div>Pyrite FeS2 has the advantages of high theoretical capacity, environmental friendliness, and low cost as an anode material for sodium-ion batteries, but it suffers from large volume expansion during cycling as well as the problem of polysulfide shuttling, which seriously affects its cycling stability and rate performance. Therefore, in this paper, a yolk–shell FeS2@NSC composite was synthesized by using Prussian blue (PB) as a precursor through dopamine coating and subsequent carbonization and vulcanization processes. The as-prepared FeS2@NSC structure not only has sufficient internal space to mitigate the volume expansion but also effectively blocks the shuttling of polysulfides through the physical barrier and chemical adsorption of the N, S co-doped carbon layer, which effectively improves the cycling stability and rate performance of the electrode. As a result, it exhibits a high specific capacity of 939 mAh g−1 after 200 cycles at 0.5 A g−1 with a superior rate capability of 575.5 mAh g−1 at 10 A g−1. Most impressively, a stable capacity of 592 mAh g−1 can still be retained even after 800 cycles at 5 A g−1. The structure provides an idea for designing high-performance anode materials for sodium-ion batteries.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"525 ","pages":"Article 146120"},"PeriodicalIF":5.5,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143713440","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

2,2,2-Trifluoroethyl nonafluorobutanesulfonate as bifunctional electrolyte additive for high-energy-density 4.5 V LiNi0.8Co0.1Mn0.1O2||Li batteries

IF 5.5 3区材料科学

Electrochimica Acta Pub Date : 2025-03-26 DOI: 10.1016/j.electacta.2025.146118

Zhengping Ding , Ran Song , Yu Shen , Huahui Lin , Peng Wei , Xiangqun Zhuge , Ke Qu , Zhenzhong Yang , Yurong Ren

{"title":"2,2,2-Trifluoroethyl nonafluorobutanesulfonate as bifunctional electrolyte additive for high-energy-density 4.5 V LiNi0.8Co0.1Mn0.1O2||Li batteries","authors":"Zhengping Ding , Ran Song , Yu Shen , Huahui Lin , Peng Wei , Xiangqun Zhuge , Ke Qu , Zhenzhong Yang , Yurong Ren","doi":"10.1016/j.electacta.2025.146118","DOIUrl":"10.1016/j.electacta.2025.146118","url":null,"abstract":"<div><div>Combining a high cut-off voltage cathode with a high specific-capacity lithium metal anode offers a promising path toward ultra-high-energy-density batteries (> 400 Wh kg-1). However, the practical application of LiNi0.8Co0.1Mn0.1O2 (NCM811)||Li batteries with a 4.5 V cut-off voltage is challenged by severe interface deterioration. This study introduces a novel bifunctional electrolyte additive called 2,2,2-Trifluoroethyl Nonafluorobutanesulfonate (TNS), designed to form a thin, robust electrolyte interface layer on both cathode and anode surfaces. Detailed analysis reveals that TNS decomposes and modifies the solid-electrolyte-interface layer. Through the synergistic effects of fluoride and sulfonate functional groups, the resulting cathode-electrolyte-interface (CEI) enhances the structural stability of NCM811 while providing a high-efficiency lithium-ion transport channel to accelerate Li+ insertion and extraction. At a cut-off voltage of 4.5 V, NCM811||Li batteries with 1 % TNS (by weight) exhibit high discharge capacity retention of 74.2 % after 150 cycles at a 1C rate and 60.1 % after 150 cycles at a 2C rate. This study offers valuable insights for designing high-voltage electrolyte additives in ultra-high-energy-density lithium metal batteries.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"525 ","pages":"Article 146118"},"PeriodicalIF":5.5,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143702971","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

Atomic-level partial replacement of Co in cubic Co3O4 with Cu for effective and stable nitrate electroreduction

IF 5.5 3区材料科学

Electrochimica Acta Pub Date : 2025-03-26 DOI: 10.1016/j.electacta.2025.146119

Sha Wang , Xiaohui Yang , Rong Wang , Cheng Song , Ling Fang , Xingzu Wang , Shasha Yu , Jingwei Li , Fengjun Yin , Hong Liu

{"title":"Atomic-level partial replacement of Co in cubic Co3O4 with Cu for effective and stable nitrate electroreduction","authors":"Sha Wang , Xiaohui Yang , Rong Wang , Cheng Song , Ling Fang , Xingzu Wang , Shasha Yu , Jingwei Li , Fengjun Yin , Hong Liu","doi":"10.1016/j.electacta.2025.146119","DOIUrl":"10.1016/j.electacta.2025.146119","url":null,"abstract":"<div><div>Electroreduction of nitrate (NO3−) into ammonia (NH3) has been regarded as a promising strategy to mitigate environmental pollution and obtain value-added product. However, this process is mainly limited by the adsorption and activation of NO3−. How to optimize the binding energy of *NO3 intermediate on electrode interface for facilitating the conversion of NO3− into NH3 is of great importance. Here, we report an effective and stable electrode of Cu0.75Co2.25O4 nanowire arrays grown on nickel foam (Cu0.75Co2.25O4 NAs@NF), where Cu partially replaces Co in Co3O4 at the atomic level with unchanged cubic structure. Compared with that of Co3O4 NAs@NF, Cu0.75Co2.25O4 NAs@NF exhibits high catalytic activity, selectivity, and stability, which enables a completed removal of 50 mg l-1 NO3− in just 50 min. Computational and theoretical analysis confirms that the tri-coordination Co mononuclear site is the active center of Cu0.75Co2.25O4 NAs@NF for NO3− electroreduction. The reason for such high activity is that the introduction of Cu can cause the d-band center upshift of tri-coordination Co mononuclear site, enhancing the adsorption and activation of NO3−, and lowering the reaction barrier. Notably, Cu0.75Co2.25O4 NAs@NF is a promising electrocatalyst that can work in a wide range of initial NO3− concentration and solution pH.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"525 ","pages":"Article 146119"},"PeriodicalIF":5.5,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143713441","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

Uncovering the Microstructure-Performance Interplay of Infiltrated Freeze Tape Cast Electrodes for Solid Oxide Cells by Physics-based Modelling

IF 6.6 3区材料科学

Electrochimica Acta Pub Date : 2025-03-26 DOI: 10.1016/j.electacta.2025.146107

Davide Cademartori, Angel Trivino-Pelaez, Maria Paola Carpanese, Maxime Hubert, Jérome Laurencin

{"title":"Uncovering the Microstructure-Performance Interplay of Infiltrated Freeze Tape Cast Electrodes for Solid Oxide Cells by Physics-based Modelling","authors":"Davide Cademartori, Angel Trivino-Pelaez, Maria Paola Carpanese, Maxime Hubert, Jérome Laurencin","doi":"10.1016/j.electacta.2025.146107","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.146107","url":null,"abstract":"Novel electrode architectures featuring hierarchical porosity and catalyst nanoparticles have been gaining increasing attention to improve the performance of the state-of-the-art solid oxide cells. In this context, a microstructure-resolved electrochemical model is here developed to unravel the properties of freeze tape cast 8YSZ scaffolds, synthetically infiltrated with Nickel nanoparticles of different size. The electrode model was built in 1D and 2D versions, including the impact of the interconnector in its 2D version. It targets the electrode design optimization by elucidating the effect of pores anisotropy on the electrochemical activity, current and gas distribution. The electrochemical properties of infiltrated microstructures are compared to those of a conventional Ni-YSZ composite to assess the potential performance gain of tailored architectures. The most promising infiltrated functional layers showed considerably lower polarization resistance (≈0.028-0.039 Ω∙cm2) than the reference Ni-8YSZ electrode (0.071 Ω∙cm2) in the investigated operating conditions. Sensitivity analyses on the morphology of the support layer are carried out in both 1D and 2D simulations. The potential detrimental impact played by low catalyst loading encourages the manufacturing of composite hierarchical microstructures. The ordered lamellar porosity of the diffusion layer was also found to question the efficacy of conventional interconnector geometries for freeze tape cast electrodes.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"91 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143702964","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

Facile preparation of MoS2/few layer graphene composites by plasma-enhanced ball milling for potassium-ion batteries

IF 5.5 3区材料科学

Electrochimica Acta Pub Date : 2025-03-26 DOI: 10.1016/j.electacta.2025.146117

Lei Dong , Jiacheng Qiu , Jingyi Zhang , Yufei wang , Yan Han , Yang Liu , Dejun Li , Jianmin Feng , Huifen Peng

{"title":"Facile preparation of MoS2/few layer graphene composites by plasma-enhanced ball milling for potassium-ion batteries","authors":"Lei Dong , Jiacheng Qiu , Jingyi Zhang , Yufei wang , Yan Han , Yang Liu , Dejun Li , Jianmin Feng , Huifen Peng","doi":"10.1016/j.electacta.2025.146117","DOIUrl":"10.1016/j.electacta.2025.146117","url":null,"abstract":"<div><div>Potassium-ion batteries (PIBs) display significant potential for large-scale energy storage systems, attributed to their high energy density. Molybdenum disulfide (MoS2), with its high theoretical capacity and 2D layered structure, is an ideal anode material for K+ intercalation/deintercalation in PIBs. However, the low electronic conductivity and substantial volume changes during K+ insertion/extraction inherently limit the performance of MoS2. A plasma-enhanced ball milling process has been employed to synthesize MoS2/few-layer graphene (FLG) composites, achieving mechanical exfoliation and MoS2-FLG bonding in a single step. The synthesized MoS2/FLG composite material significantly benefits from the exceptional electrical conductivity and excellent mechanical properties of FLG. This results in outstanding K+ storage performance. Notably, it demonstrates an impressive rate capacity of 184 mAh g-1 at a high current density of 1.6 A g-1. Additionally, the material exhibits outstanding cyclic stability, maintaining a capacity of 323 mAh g-1 over 200 cycles at a current density of 0.1 A g-1. The mechanism of the conversion reaction of MoS₂ during the electrochemical cycling process has been elucidated through ex situ X-ray photoelectron spectroscopy (XPS). More importantly, this research introduces an effective strategy for synthesizing multi-component composites, where plasma facilitates material exfoliation and binding between different components.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"525 ","pages":"Article 146117"},"PeriodicalIF":5.5,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143702963","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

Electrochemical noise analysis of the hot corrosion of TP347H stainless steel: Effect of temperature and coal ash thickness

IF 5.5 3区材料科学

Electrochimica Acta Pub Date : 2025-03-25 DOI: 10.1016/j.electacta.2025.146105

Youyuan Zhang, Shanshan Hu, Yuying Wen, Alexander I. Ikeuba, Xingru Tan, Ting Sun, Xingbo Liu

{"title":"Electrochemical noise analysis of the hot corrosion of TP347H stainless steel: Effect of temperature and coal ash thickness","authors":"Youyuan Zhang, Shanshan Hu, Yuying Wen, Alexander I. Ikeuba, Xingru Tan, Ting Sun, Xingbo Liu","doi":"10.1016/j.electacta.2025.146105","DOIUrl":"10.1016/j.electacta.2025.146105","url":null,"abstract":"<div><div>Hot corrosion detection has long been a challenge, and in-situ analysis of high-temperature electrochemical kinetics and corrosion processes is continuously evolving. Herein, electrochemical noise (EN) was employed as a reliable method to study the hot corrosion of TP347H stainless steel systematically at various temperatures (650 °C, 700 °C, and 750 °C) and coal ash thicknesses (3 mm and 6 mm). Other corrosion detection techniques were also used such as weight loss, open circuit potential (OCP) and potentiodynamic polarization (PDP) in addition to characterization techniques such as scanning electron microscopy (SEM) and X-ray diffraction spectroscopy (XRD). Results revealed that the trend of corrosion rate is 650 °C < 750 °C < 700 °C. The reduction in corrosion rate at 750 °C was attributed to the decomposition of surface iron sulfate and the formation of a new protective iron oxide layer. Additionally, increased thickness of the molten salt layer was found to accelerate the corrosion rate by enhancing the solubility of pyrosulfate salts. Also, the corrosion mechanism was further elucidated with the aid of SEM and XRD characterization. Detailed analysis of electrochemical noise using shot noise theory, and the Hilbert-Huang Transform (HHT) clarified the relationships between corrosion mechanism and electrochemical signals, by evaluating charge transfer, pit initiation rate, growth rate, and the frequency and amplitude of events. These findings also demonstrate the effectiveness of advanced analysis of electrochemical noise data for studying hot corrosion.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"525 ","pages":"Article 146105"},"PeriodicalIF":5.5,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143695327","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

Immersion and electrochemical deposition of copper on steels in ethaline-based solutions

IF 5.5 3区材料科学

Electrochimica Acta Pub Date : 2025-03-25 DOI: 10.1016/j.electacta.2025.146112

Vadim L. Filippov , Nikolai I. Ponomarev , Alexey V. Shapagin , Galina V. Kostikova , Alexander V. Rudnev

{"title":"Immersion and electrochemical deposition of copper on steels in ethaline-based solutions","authors":"Vadim L. Filippov , Nikolai I. Ponomarev , Alexey V. Shapagin , Galina V. Kostikova , Alexander V. Rudnev","doi":"10.1016/j.electacta.2025.146112","DOIUrl":"10.1016/j.electacta.2025.146112","url":null,"abstract":"<div><div>The galvanic replacement (GR) reaction between Cu ions and electronegative substrates such as Fe and steels can result in poor adhesion of electrochemical Cu coatings. A particular challenge is the Cu plating of stainless steels (SS), which surface is rich of chromium oxides. This study investigates Cu immersion deposition on carbon steel (CS) and SS and its impact on the electrochemical copper plating of these steels in a deep eutectic solvent – ethaline – containing either CuCl or CuCl2 salt. The GR reaction rate was determined using inductively coupled plasma mass spectrometry and surface morphology was monitored using scanning electron microscopy. The findings show that the GR reaction on SS is negligible in the Cu(I) solution in ethaline and proceeds extremely slowly in the Cu(II) solution in ethaline, apparently due to the strong passivation of the SS surface. In contrast, Cu immersion deposition on CS occurs in both Cu(I) and Cu(II) solutions, though at a slower rate than in aqueous solutions or even in the copper chloride solutions in ethaline on pure Fe. This slowdown is attributed to diffusion limitations in ethaline and to gradual saturation of the CS substrate surface with carbon, as Fe dissolves. Cu electrodeposition results in dense and tightly bound Cu deposits on CS, while peeling of the deposit is observed on SS. However, a pulsed potentiostatic deposition mode improves the adhesion of Cu to SS. The obtained results suggest that ethaline is a promising medium for one-step Cu plating of carbon and stainless steels.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"525 ","pages":"Article 146112"},"PeriodicalIF":5.5,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143695761","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

Dynamics Interaction in highly stretchable EGMEA-g-ENR-LiTFSI Systems: Insights from Molecular Interactions via Real Time Raman and DFT Analysis

IF 6.6 3区材料科学

Electrochimica Acta Pub Date : 2025-03-25 DOI: 10.1016/j.electacta.2025.146114

KaiLing Chai, Mohd Sukor Su'ait, Ganes Shukri, Tian Khoon Lee

{"title":"Dynamics Interaction in highly stretchable EGMEA-g-ENR-LiTFSI Systems: Insights from Molecular Interactions via Real Time Raman and DFT Analysis","authors":"KaiLing Chai, Mohd Sukor Su'ait, Ganes Shukri, Tian Khoon Lee","doi":"10.1016/j.electacta.2025.146114","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.146114","url":null,"abstract":"Improving the properties of natural rubber (NR) for advanced applications remains a critical challenge, particularly in achieving enhanced mechanical, thermal and ionic conductivity properties. Here, ethylene glycol methyl ether acrylate-grafted epoxidized natural rubber with lithium bis(trifluoromethanesulfonyl)imide (EGMEA-g-ENR-LiTFSI) was synthesized via a UV-curing process, significantly reducing solvent usage and preparation time. A comprehensive investigation combining experimental and computational approaches was performed to optimize material properties. Analytical techniques, including in situ Raman spectroscopy, FTIR, TGA, DSC, XRD, electrochemical analysis and density functional theory (DFT) simulations were employed to evaluate the material properties. The Raman spectra exhibited significant alterations in molecular structure, offering critical insights into the grafting reactions and facilitating a deeper understanding of the electrochemical behaviour of the system. Furthermore, DFT analysis provide insights into the molecular interactions between lithium salts and rubber-based polymer matrix, complementing experimental findings. The results demonstrated enhanced polymer-salt interactions, suppression of crystallinity, and improved ionic conductivity and thermal stability in the rubber-based polymer. In particular, we demonstrate both the applicability and limitations of the epoxide group in ENR, providing key insights for improving the stability and performance of the material.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"61 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143695323","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 method for estimating lithium-ion battery state of health based on physics-informed hybrid neural network

IF 5.5 3区材料科学

Electrochimica Acta Pub Date : 2025-03-25 DOI: 10.1016/j.electacta.2025.146110

Yufu Luo, Shaoxiao Ju, Peichao Li, Hengyun Zhang

{"title":"A method for estimating lithium-ion battery state of health based on physics-informed hybrid neural network","authors":"Yufu Luo, Shaoxiao Ju, Peichao Li, Hengyun Zhang","doi":"10.1016/j.electacta.2025.146110","DOIUrl":"10.1016/j.electacta.2025.146110","url":null,"abstract":"<div><div>Lithium-ion batteries (LIBs) are widely used in portable electronic devices and electric vehicles due to their high energy density and long cycle life. However, aging is inevitable during battery cycling, leading to capacity degradation and performance deterioration, which in turn affects the accuracy of state of health (SOH) estimation. To address these issues, this paper proposes a physics-information hybrid neural network (PIHNN). By integrating the electrochemical-thermal-mechanical-side reaction coupling (ETMS) aging model with data-driven methods, the proposed framework achieves accurate capacity loss prediction. The PIHNN framework innovatively introduces membrane resistance as a key health indicator. A physical constraint term, based on the monotonic relationship between membrane resistance and capacity loss, is embedded to enhance physical consistency and prediction accuracy. Additionally, Bayesian optimization algorithm (BOA) is employed for efficient hyperparameter tuning, further improving model performance and computational efficiency. The results demonstrate that under different operating conditions (1C, 0.5C, and 2C), the PIHNN significantly outperforms traditional models in terms of mean absolute error (MAE) and root mean square error (RMSE). The model exhibits superior predictive performance and robustness. In addition, validation on a publicly available dataset from Oxford University reduces MAE and RMSE to below 0.5 %.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"525 ","pages":"Article 146110"},"PeriodicalIF":5.5,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143703025","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

Passivation of aluminium A1050 in MKPC matrices: effect of MgO type and chemical retarder composition

IF 5.5 3区材料科学

Electrochimica Acta Pub Date : 2025-03-25 DOI: 10.1016/j.electacta.2025.146104

Carla Fernández-García , Kim-Khanh Le , María Cruz Alonso , Céline Cannes , Sylvie Delpech

{"title":"Passivation of aluminium A1050 in MKPC matrices: effect of MgO type and chemical retarder composition","authors":"Carla Fernández-García , Kim-Khanh Le , María Cruz Alonso , Céline Cannes , Sylvie Delpech","doi":"10.1016/j.electacta.2025.146104","DOIUrl":"10.1016/j.electacta.2025.146104","url":null,"abstract":"<div><div>Magnesium potassium phosphate cement (MKPC) is a promising material for encapsulating low- to intermediate-level radioactive metallic wastes, including aluminium. This study investigates the influence of magnesium oxide (MgO) type and chemical retarders—boric acid and sodium thiosulfate—on the passivation of aluminium A1050 alloy. Corrosion behaviour and hydrogen evolution were monitored over 25 days in aqueous solutions and 230 days in mortars using electrochemical impedance spectroscopy and linear polarisation resistance. In aqueous solutions, boric acid improved passivation by shifting the corrosion potential to more anodic values, while thiosulfate promoted rapid passivation through adsorption, leading to slightly lower anodic potentials. In mortars, the near-neutral pH facilitated passivation, though variations were observed depending on the MgO type and retarder composition. Soft-burnt MgO combined with thiosulfate accelerated the formation of the alumina layer, enhancing passivation and reducing corrosion kinetics due to its higher reactivity and refined pore structure. In contrast, hard-burnt MgO with boric acid resulted in slower passivation and more cathodic potentials, likely due to its lower reactivity and heterogeneous pore network. When both retarders were used together, a competitive effect was observed, reducing passivation efficiency and increasing hydrogen evolution despite anodic potential shifts. These findings underscore the critical role of MgO type and retarder selection in optimising aluminium passivation within MKPC systems.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"525 ","pages":"Article 146104"},"PeriodicalIF":5.5,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143695324","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