State-of-health (SOH) of lithium-ion batteries is an important indicator for measuring performance and remaining life. We propose an innovative prediction model that integrates variational mode decomposition (VMD), Dung Beetle optimizer (DBO), and support vector regression (SVR) algorithms. We extracted relevant features from the discharge characteristic curve and incremental capacity curve. We used Pearson and Spearman correlation coefficient methods for correlation analysis on the extracted health factors (HFs), selecting those that significantly impact SOH as input features. A DBO-SVR model was constructed to establish a nonlinear correlation between HFs and SOH, and the DBO algorithm was used to globally search and optimize the hyperparameters of the SVR model to improve its prediction accuracy. To reduce the impact of noise in battery signals on model performance, VMD technology was introduced to decompose battery signals into multiple intrinsic mode components, to extract useful features and remove noise to further improve prediction accuracy. The proposed method was validated using the NASA battery dataset and compared with other algorithm models. Results showed that the prediction model was significantly better than other models, with a maximum RMSE value of 0.84%, a maximum MAE value of 0.71%, and a stable prediction error value within 1%.
{"title":"State of Health Estimation of Lithium-Ion Battery for Electric Vehicle Based on VMD-DBO-SVR Model","authors":"Liang Tong, Minghui Gong, Yong Chen, Rao Kuang, Yonghong Xu, Hongguang Zhang, Baoying Peng, Fubin Yang, Jian Zhang and Yiyang Li","doi":"10.1149/1945-7111/ad6935","DOIUrl":"https://doi.org/10.1149/1945-7111/ad6935","url":null,"abstract":"State-of-health (SOH) of lithium-ion batteries is an important indicator for measuring performance and remaining life. We propose an innovative prediction model that integrates variational mode decomposition (VMD), Dung Beetle optimizer (DBO), and support vector regression (SVR) algorithms. We extracted relevant features from the discharge characteristic curve and incremental capacity curve. We used Pearson and Spearman correlation coefficient methods for correlation analysis on the extracted health factors (HFs), selecting those that significantly impact SOH as input features. A DBO-SVR model was constructed to establish a nonlinear correlation between HFs and SOH, and the DBO algorithm was used to globally search and optimize the hyperparameters of the SVR model to improve its prediction accuracy. To reduce the impact of noise in battery signals on model performance, VMD technology was introduced to decompose battery signals into multiple intrinsic mode components, to extract useful features and remove noise to further improve prediction accuracy. The proposed method was validated using the NASA battery dataset and compared with other algorithm models. Results showed that the prediction model was significantly better than other models, with a maximum RMSE value of 0.84%, a maximum MAE value of 0.71%, and a stable prediction error value within 1%.","PeriodicalId":17364,"journal":{"name":"Journal of The Electrochemical Society","volume":"10 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141942907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nanocomposite electrodes comprising LaSi2 and Si exhibit satisfactory charge–discharge cycling performances but their capacity is degraded after repeated cycles. A metallographic structure, in which the Si phase was finely dispersed in the LaSi2 matrix phase, was formed before cycling. The elastic LaSi2 relieved Si-generated stress and suppressed electrode disintegration. Contrarily, the LaSi2 phase in the metallographic structure was surrounded by the Si matrix phase after cycling. The positional relationship between the two phases was reversed, and LaSi2 could not relieve the stress. For a nanocomposite electrode containing CrSi2, which exhibits stiffness to withstand the Si-generated stress, the structural changes were suppressed after cycling, resulting in good cycling stability. Here, we considered that the addition of stiff silicides as a third phase to the LaSi2/Si composite could improve the cycle life. Thus, this study prepared nanocomposite electrodes containing elastic LaSi2, stiff MSi2 (where M = Cr, Mo, Nb, Ta, Ti, or W), and elemental Si and investigated their electrochemical performances. Reaction behaviors, such as the metallographic structure, electrode thickness, and phase transition, were also clarified. The LaSi2/NbSi2/Si electrode exhibited the best cycle life without changes in its metallographic structure owing to the synergistic effect of stiff and elastic silicides.
{"title":"Silicon-Based Nanocomposite Anodes with Excellent Cycle Life for Lithium-Ion Batteries Achieved by the Synergistic Effect of Two Silicides","authors":"Yasuhiro Domi, Hiroyuki Usui, Takumi Okasaka, Kei Nishikawa and Hiroki Sakaguchi","doi":"10.1149/1945-7111/ad69c6","DOIUrl":"https://doi.org/10.1149/1945-7111/ad69c6","url":null,"abstract":"Nanocomposite electrodes comprising LaSi2 and Si exhibit satisfactory charge–discharge cycling performances but their capacity is degraded after repeated cycles. A metallographic structure, in which the Si phase was finely dispersed in the LaSi2 matrix phase, was formed before cycling. The elastic LaSi2 relieved Si-generated stress and suppressed electrode disintegration. Contrarily, the LaSi2 phase in the metallographic structure was surrounded by the Si matrix phase after cycling. The positional relationship between the two phases was reversed, and LaSi2 could not relieve the stress. For a nanocomposite electrode containing CrSi2, which exhibits stiffness to withstand the Si-generated stress, the structural changes were suppressed after cycling, resulting in good cycling stability. Here, we considered that the addition of stiff silicides as a third phase to the LaSi2/Si composite could improve the cycle life. Thus, this study prepared nanocomposite electrodes containing elastic LaSi2, stiff MSi2 (where M = Cr, Mo, Nb, Ta, Ti, or W), and elemental Si and investigated their electrochemical performances. Reaction behaviors, such as the metallographic structure, electrode thickness, and phase transition, were also clarified. The LaSi2/NbSi2/Si electrode exhibited the best cycle life without changes in its metallographic structure owing to the synergistic effect of stiff and elastic silicides.","PeriodicalId":17364,"journal":{"name":"Journal of The Electrochemical Society","volume":"41 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141942969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-06DOI: 10.1149/1945-7111/ad69ca
Jean-Luc Fattebert and Lorena Alzate-Vargas
We revisit a theoretical result by Okamoto (2013 Journal of The Electrochemical Society, 160, A404) who calculated the energy barrier for the decomposition of lithium hexafluorophosphate (LiPF6) into LiF + PF5 when solvated in Ethylene carbonate (EC)-based electrolyte. Using different numerical techniques to discretize the Density Functional Theory (DFT) equations, and different continuum solvation models with the same dielectric constant, our results largely confirm the original calculation. However, simulations with a higher dielectric permittivity value, closer to that of EC, show a lower energy barrier. More importantly, First-Principles simulations with an explicit solvent show a substantially lower energy barrier.
我们重温了 Okamoto（2013 Journal of The Electrochemical Society, 160, A404）的一项理论成果，他计算了六氟磷酸锂（LiPF6）在碳酸乙烯酯（EC）基电解质中溶解时分解为 LiF + PF5 的能障。我们使用不同的数值技术对密度泛函理论（DFT）方程进行离散化，并在相同介电常数下使用不同的连续介质溶解模型，结果在很大程度上证实了最初的计算结果。然而，介电常数值更高，更接近于导电率的模拟结果显示能垒更低。更重要的是，使用显式溶剂的第一性原理模拟显示出更低的能障。
{"title":"Communication—First-Principles Simulations of LiPF6 Decomposition in Ethylene Carbonate-Based Electrolytes","authors":"Jean-Luc Fattebert and Lorena Alzate-Vargas","doi":"10.1149/1945-7111/ad69ca","DOIUrl":"https://doi.org/10.1149/1945-7111/ad69ca","url":null,"abstract":"We revisit a theoretical result by Okamoto (2013 Journal of The Electrochemical Society, 160, A404) who calculated the energy barrier for the decomposition of lithium hexafluorophosphate (LiPF6) into LiF + PF5 when solvated in Ethylene carbonate (EC)-based electrolyte. Using different numerical techniques to discretize the Density Functional Theory (DFT) equations, and different continuum solvation models with the same dielectric constant, our results largely confirm the original calculation. However, simulations with a higher dielectric permittivity value, closer to that of EC, show a lower energy barrier. More importantly, First-Principles simulations with an explicit solvent show a substantially lower energy barrier.","PeriodicalId":17364,"journal":{"name":"Journal of The Electrochemical Society","volume":"8 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141942972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-31DOI: 10.1149/1945-7111/ad6483
Taylor R. Garrick, Miguel A. Fernandez, Brian J. Koch, Erin Efimoff, Matthew Jones, Rafid Mollah, Hunter Teel, Xiaoniu Du, Sirivatch Shimpalee, Song-Yul Choe, Venkat R. Subramanian, Jason B. Siegel
Automotive manufacturers are working to improve individual cell, module, and overall pack design by increasing the performance, range, and durability, while reducing cost. One key piece to consider during the design process is the active material volume change, its linkage to the particle, electrode, and cell level volume changes, and the interplay with structural components in the rechargeable energy storage system. As the time from initial design to manufacture of electric vehicles decreases, design work needs to move to the virtual domain; therefore, a need for coupled electrochemical-mechanical models that take into account the active material volume change and the rate dependence of this volume change need to be considered. In this study, we illustrated the applicability of a coupled electrochemical-mechanical battery model considering multiple representative particles to capture experimentally measured rate dependent reversible volume change at the cell level through the use of an electrochemical-mechanical battery model that couples the particle, electrode, and cell level volume changes. By employing this coupled approach, the importance of considering multiple active material particle sizes representative of the distribution is demonstrated. The non-uniformity in utilization between two different size particles as well as the significant spatial non-uniformity in the radial direction of the larger particles is the primary driver of the rate dependent characteristics of the volume change at the electrode and cell level.
{"title":"Modeling Rate Dependent Volume Change in Porous Electrodes in Lithium-Ion Batteries","authors":"Taylor R. Garrick, Miguel A. Fernandez, Brian J. Koch, Erin Efimoff, Matthew Jones, Rafid Mollah, Hunter Teel, Xiaoniu Du, Sirivatch Shimpalee, Song-Yul Choe, Venkat R. Subramanian, Jason B. Siegel","doi":"10.1149/1945-7111/ad6483","DOIUrl":"https://doi.org/10.1149/1945-7111/ad6483","url":null,"abstract":"Automotive manufacturers are working to improve individual cell, module, and overall pack design by increasing the performance, range, and durability, while reducing cost. One key piece to consider during the design process is the active material volume change, its linkage to the particle, electrode, and cell level volume changes, and the interplay with structural components in the rechargeable energy storage system. As the time from initial design to manufacture of electric vehicles decreases, design work needs to move to the virtual domain; therefore, a need for coupled electrochemical-mechanical models that take into account the active material volume change and the rate dependence of this volume change need to be considered. In this study, we illustrated the applicability of a coupled electrochemical-mechanical battery model considering multiple representative particles to capture experimentally measured rate dependent reversible volume change at the cell level through the use of an electrochemical-mechanical battery model that couples the particle, electrode, and cell level volume changes. By employing this coupled approach, the importance of considering multiple active material particle sizes representative of the distribution is demonstrated. The non-uniformity in utilization between two different size particles as well as the significant spatial non-uniformity in the radial direction of the larger particles is the primary driver of the rate dependent characteristics of the volume change at the electrode and cell level.","PeriodicalId":17364,"journal":{"name":"Journal of The Electrochemical Society","volume":"292 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141868226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-29DOI: 10.1149/1945-7111/ad650b
Tuyet Nhung Pham, Van Manh Tien, Van Hoang Ong, Nhat Trang Nguyen Le, Thuy Nguyen Linh Ho, Hoang Doan Tan Le, Nguyen Quang Hoa, Hoang Vinh Tran, Dinh Ngo Xuan, Huy Tran Quang, Lam Dinh Vu, Anh-Tuan Le
Silver (Ag) and gold (Au) nanoparticles (NPs) are incorporated into the zeolitic imidazolate framework-8 (ZIF-8) host matrix, which is successfully coated the screen-printed electrodes (SPEs) for the effective detection of chloramphenicol (CAP). The morphological and structural characteristics are examined using scanning electron microscope (SEM) and X-ray diffraction (XRD) analysis. Additionally, the electrochemical characteristics and sensing performance of CAP on the proposed electrodes are investigated in detail using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), chronoamperometry (CA), and differential pulse voltammetry (DPV) measurements, respectively. The results suggest the SPEs modified with Ag@ZIF-8 and Au@ZIF-8 exhibit impressive enhancements in sensitivity, linear concentration range, limits of detection (LODs), and repeatability. Under the optimum conditions, the proposed electrochemical sensors had a linear range of 0.25–50 μM for Ag@ZIF-8/SPE and 5–50 μM for Au@ZIF-8/SPE, corresponding to LODs of 0.16 and 0.404 μM, respectively. Notably, a series of kinetic parameters related to the redox reactions of both standard Fe(CN)63−/4− probe and CAP molecules in phosphate-buffered saline (PBS) buffer are determined. Furthermore, valuable insights into the influence mechanism nature of Ag@ZIF-8 and Au@ZIF-8 nanocomposites on the electrochemical behaviors are proposed, demonstrating the great potential of the developed sensors for CAP detection.
将银（Ag）和金（Au）纳米粒子（NPs）掺入到沸石咪唑啉框架-8（ZIF-8）主基质中，并成功涂覆到丝网印刷电极（SPEs）上，以有效检测氯霉素（CAP）。利用扫描电子显微镜（SEM）和 X 射线衍射（XRD）分析研究了其形态和结构特征。此外，还分别使用循环伏安法 (CV)、电化学阻抗谱 (EIS)、时变法 (CA) 和差分脉冲伏安法 (DPV) 测量方法详细研究了 CAP 在所提电极上的电化学特性和传感性能。结果表明，用 Ag@ZIF-8 和 Au@ZIF-8 修饰的固相萃取剂在灵敏度、线性浓度范围、检出限 (LOD) 和重复性方面都有显著提高。在最佳条件下，Ag@ZIF-8/SPE 的线性范围为 0.25-50 μM，Au@ZIF-8/SPE 的线性范围为 5-50 μM，相应的检测限分别为 0.16 和 0.404 μM。值得注意的是，测定了标准 Fe(CN)63-/4- 探针和 CAP 分子在磷酸盐缓冲盐水（PBS）缓冲液中氧化还原反应的一系列动力学参数。此外，还就 Ag@ZIF-8 和 Au@ZIF-8 纳米复合材料对电化学行为的影响机理性质提出了有价值的见解，证明了所开发的传感器在 CAP 检测方面的巨大潜力。
{"title":"Electrochemical Kinetic Behaviors and Sensing Performance of Au@ZIF-8 and Ag@ZIF-8 Nanocomposites-Based Platforms Towards Ultrasensitive Detection of Chloramphenicol","authors":"Tuyet Nhung Pham, Van Manh Tien, Van Hoang Ong, Nhat Trang Nguyen Le, Thuy Nguyen Linh Ho, Hoang Doan Tan Le, Nguyen Quang Hoa, Hoang Vinh Tran, Dinh Ngo Xuan, Huy Tran Quang, Lam Dinh Vu, Anh-Tuan Le","doi":"10.1149/1945-7111/ad650b","DOIUrl":"https://doi.org/10.1149/1945-7111/ad650b","url":null,"abstract":"Silver (Ag) and gold (Au) nanoparticles (NPs) are incorporated into the zeolitic imidazolate framework-8 (ZIF-8) host matrix, which is successfully coated the screen-printed electrodes (SPEs) for the effective detection of chloramphenicol (CAP). The morphological and structural characteristics are examined using scanning electron microscope (SEM) and X-ray diffraction (XRD) analysis. Additionally, the electrochemical characteristics and sensing performance of CAP on the proposed electrodes are investigated in detail using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), chronoamperometry (CA), and differential pulse voltammetry (DPV) measurements, respectively. The results suggest the SPEs modified with Ag@ZIF-8 and Au@ZIF-8 exhibit impressive enhancements in sensitivity, linear concentration range, limits of detection (LODs), and repeatability. Under the optimum conditions, the proposed electrochemical sensors had a linear range of 0.25–50 <italic toggle=\"yes\">μ</italic>M for Ag@ZIF-8/SPE and 5–50 <italic toggle=\"yes\">μ</italic>M for Au@ZIF-8/SPE, corresponding to LODs of 0.16 and 0.404 <italic toggle=\"yes\">μ</italic>M, respectively. Notably, a series of kinetic parameters related to the redox reactions of both standard Fe(CN)<sub>6</sub>\u0000<sup>3−/4−</sup> probe and CAP molecules in phosphate-buffered saline (PBS) buffer are determined. Furthermore, valuable insights into the influence mechanism nature of Ag@ZIF-8 and Au@ZIF-8 nanocomposites on the electrochemical behaviors are proposed, demonstrating the great potential of the developed sensors for CAP detection.<inline-formula>\u0000<inline-graphic xlink:href=\"jesad650b-ga.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>","PeriodicalId":17364,"journal":{"name":"Journal of The Electrochemical Society","volume":"25 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141868245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-25DOI: 10.1149/1945-7111/ad6482
Mohd. Sufiyan Khan, Anwesha Mukherjee, Pabitra Ghosh and Kumaresan R.
Ti2CrV alloy shows good hydrogen storage characteristics at room temperature and ambient pressure. The present study investigated the feasibility of direct electrochemical reduction of TiO2-Cr2O3-V3O5 to Ti2CrV in CaCl2 melt at 900 °C by the FFC Cambridge process. The electrolysis was conducted in a two-electrode assembly with the sintered mixed oxide cathode and HD graphite anode at a constant cell voltage of 3.1 V for different time intervals to elucidate the reduction mechanism of the metal oxide mixture. The obtained products were characterized by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy techniques. Cyclic voltammetry studies using metallic cavity electrode containing mixed metal oxide powder were also carried out to determine the electrochemical reduction behavior in CaCl2 melt at 900 °C. It was observed that the presence of pre-formed Cr and V metal in the vicinity of titanium oxide helped in its faster reduction. The complete metallization of the sintered mixed oxide pellet occurred after 15 h of electrolysis. The electrochemical reduction mechanism was observed to proceed through various intermediates such as chromium-rich Cr-V, vanadium-rich V-Cr, CaTiO3, TiO, Ti6O, Ti-V, and C15-TiCr2.
Ti2CrV 合金在室温和环境压力下具有良好的储氢特性。本研究探讨了在 900 °C 的 CaCl2 熔体中通过 FFC 剑桥工艺将 TiO2-Cr2O3-V3O5 直接电化学还原为 Ti2CrV 的可行性。电解在烧结混合氧化物阴极和 HD 石墨阳极的双电极组件中进行，在 3.1 V 恒定电池电压下进行不同时间间隔的电解，以阐明金属氧化物混合物的还原机制。获得的产物通过 X 射线衍射、扫描电子显微镜和能量色散 X 射线光谱技术进行了表征。此外，还使用含有混合金属氧化物粉末的金属空腔电极进行了循环伏安研究，以确定在 900 °C 下 CaCl2 熔体中的电化学还原行为。研究发现，在氧化钛附近存在预成形的铬和钒金属有助于加快其还原速度。烧结的混合氧化物颗粒在电解 15 小时后完全金属化。据观察，电化学还原机制是通过各种中间产物进行的，如富铬 Cr-V、富钒 V-Cr、CaTiO3、TiO、Ti6O、Ti-V 和 C15-TiCr2。
{"title":"Electrochemical Preparation of Ti2CrV Alloy in CaCl2 Melt","authors":"Mohd. Sufiyan Khan, Anwesha Mukherjee, Pabitra Ghosh and Kumaresan R.","doi":"10.1149/1945-7111/ad6482","DOIUrl":"https://doi.org/10.1149/1945-7111/ad6482","url":null,"abstract":"Ti2CrV alloy shows good hydrogen storage characteristics at room temperature and ambient pressure. The present study investigated the feasibility of direct electrochemical reduction of TiO2-Cr2O3-V3O5 to Ti2CrV in CaCl2 melt at 900 °C by the FFC Cambridge process. The electrolysis was conducted in a two-electrode assembly with the sintered mixed oxide cathode and HD graphite anode at a constant cell voltage of 3.1 V for different time intervals to elucidate the reduction mechanism of the metal oxide mixture. The obtained products were characterized by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy techniques. Cyclic voltammetry studies using metallic cavity electrode containing mixed metal oxide powder were also carried out to determine the electrochemical reduction behavior in CaCl2 melt at 900 °C. It was observed that the presence of pre-formed Cr and V metal in the vicinity of titanium oxide helped in its faster reduction. The complete metallization of the sintered mixed oxide pellet occurred after 15 h of electrolysis. The electrochemical reduction mechanism was observed to proceed through various intermediates such as chromium-rich Cr-V, vanadium-rich V-Cr, CaTiO3, TiO, Ti6O, Ti-V, and C15-TiCr2.","PeriodicalId":17364,"journal":{"name":"Journal of The Electrochemical Society","volume":"24 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141776881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-25DOI: 10.1149/1945-7111/ad6508
Raluca-Ioana Stefan-van Staden, Damaris-Cristina Gheorghe and Ruxandra-Maria Ilie-Mihai
VSIG1 is a new biomarker member of the JAM family relevant in gastric cancer diagnostics. Due to its detection and quantification impact for fast and early diagnosis of gastric cancer, two types of intelligent miniplatforms based on stochastic sensors as detection tools, were designed and validated using real samples. A 3D stochastic microsensor based on Nitrogen and Sulfur dopped graphene paste modified with calix[4]arene-25,26,27,28-tetrol, and a 2D disposable screen-printed stochastic sensor based on thin film gold modified with calix[4]arene-25,26,27,28-tetrol were constructed and inserted as working sensors into the miniplatforms. The proposed intelligent miniplatforms shown sensitivities as high as 1.12 × 1010 s−1g−1ml, limits of determination of 1 × 10−23g ml−1, and working concentration ranges between 1 × 10−23 and 1 × 10−8 g ml−1. Recoveries higher than 99.30% with % RSD values lower than 0.05% were obtained when used for screening test of biological samples, for VSIG1.
{"title":"Molecular Recognition of VSIG1 in Biological Samples for Fast Diagnosis of Gastric Cancer","authors":"Raluca-Ioana Stefan-van Staden, Damaris-Cristina Gheorghe and Ruxandra-Maria Ilie-Mihai","doi":"10.1149/1945-7111/ad6508","DOIUrl":"https://doi.org/10.1149/1945-7111/ad6508","url":null,"abstract":"VSIG1 is a new biomarker member of the JAM family relevant in gastric cancer diagnostics. Due to its detection and quantification impact for fast and early diagnosis of gastric cancer, two types of intelligent miniplatforms based on stochastic sensors as detection tools, were designed and validated using real samples. A 3D stochastic microsensor based on Nitrogen and Sulfur dopped graphene paste modified with calix[4]arene-25,26,27,28-tetrol, and a 2D disposable screen-printed stochastic sensor based on thin film gold modified with calix[4]arene-25,26,27,28-tetrol were constructed and inserted as working sensors into the miniplatforms. The proposed intelligent miniplatforms shown sensitivities as high as 1.12 × 1010 s−1g−1ml, limits of determination of 1 × 10−23g ml−1, and working concentration ranges between 1 × 10−23 and 1 × 10−8 g ml−1. Recoveries higher than 99.30% with % RSD values lower than 0.05% were obtained when used for screening test of biological samples, for VSIG1.","PeriodicalId":17364,"journal":{"name":"Journal of The Electrochemical Society","volume":"3 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141776973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-24DOI: 10.1149/1945-7111/ad6480
Hedi Wei, Mei Li, Yixuan Cai, Yabin Wang, Xudong Wang, Xiaohui Lan, Meng Zhang, Rugeng Liu and Wei Han
Mass transfer is an important link in the entire electrode process. To investigate mass transfer process by diffusion of trivalent rare Earth ions in molten LiCl-KCl system, the electroreduction mechanism, mass transfer kinetics and diffusion layer thicknesses of RE(III) (RE = La and Pr) were studied by a series of electrochemical methods. It was found that RE(III) underwent one-step reduction reaction with the exchange of 3-electron and reversible processes. The diffusion coefficients (D) of RE(III) and limiting current densities (jl) for RE(III)/RE pair were measured at different temperatures and concentrations by cyclic voltammetry and chronoamperometry, respectively. Based on the results of D and jl, the diffusion layer thickness (δ) of RE(III) was calculated using the simplified Nernst-Planck formula. Furthermore, the impacts of temperature and concentration on δ were explored. The results indicated that as the temperature declined and ions concentration increased, δ decreased. Meanwhile, the relationships between δ and temperature and concentration were also obtained.
{"title":"Mass Transfer Process by Diffusion of RE(III) (RE=La, Pr) in Eutectic LiCl-KCl Salt","authors":"Hedi Wei, Mei Li, Yixuan Cai, Yabin Wang, Xudong Wang, Xiaohui Lan, Meng Zhang, Rugeng Liu and Wei Han","doi":"10.1149/1945-7111/ad6480","DOIUrl":"https://doi.org/10.1149/1945-7111/ad6480","url":null,"abstract":"Mass transfer is an important link in the entire electrode process. To investigate mass transfer process by diffusion of trivalent rare Earth ions in molten LiCl-KCl system, the electroreduction mechanism, mass transfer kinetics and diffusion layer thicknesses of RE(III) (RE = La and Pr) were studied by a series of electrochemical methods. It was found that RE(III) underwent one-step reduction reaction with the exchange of 3-electron and reversible processes. The diffusion coefficients (D) of RE(III) and limiting current densities (jl) for RE(III)/RE pair were measured at different temperatures and concentrations by cyclic voltammetry and chronoamperometry, respectively. Based on the results of D and jl, the diffusion layer thickness (δ) of RE(III) was calculated using the simplified Nernst-Planck formula. Furthermore, the impacts of temperature and concentration on δ were explored. The results indicated that as the temperature declined and ions concentration increased, δ decreased. Meanwhile, the relationships between δ and temperature and concentration were also obtained.","PeriodicalId":17364,"journal":{"name":"Journal of The Electrochemical Society","volume":"23 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141777045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-16DOI: 10.1149/1945-7111/ad5cc5
Akira Nagaoka, Hiroshi Yakuwa, Ryotaro Yamamoto and Kenji Amaya
The potential, current density, pH, and crevice profile distribution within the crevice structure of stainless steel in seawater were numerically analyzed. The crevice corrosion phenomena were mathematically modeled with the initial boundary value problem of diffusion and static electrical field, respectively. This initial boundary value problem was discretized using a finite difference method. The predicts of the crevice corrosion behaviors, set for various external potentials and initial crevice gaps, were classified into three categories: the pitting type, the active type, and no corrosion. The pitting type crevice corrosion was predicted to occur in conditions where the external potentials were noble and the initial crevice gaps were narrow. The active type crevice corrosion was predicted to occur in conditions where the external potentials were less noble and the initial crevice gaps were narrow. The range of external potential conditions where crevice corrosion was predicted not to occur increased in conditions with wide initial crevice gaps. Crevice corrosion was predicted to occur at all external potentials in conditions where the initial crevice gaps were 2 μm or less.
{"title":"Numerical Analysis of Stainless Steel of Crevice Corrosion Initiation Behavior with Varying External Potentials and Initial Crevice Gaps","authors":"Akira Nagaoka, Hiroshi Yakuwa, Ryotaro Yamamoto and Kenji Amaya","doi":"10.1149/1945-7111/ad5cc5","DOIUrl":"https://doi.org/10.1149/1945-7111/ad5cc5","url":null,"abstract":"The potential, current density, pH, and crevice profile distribution within the crevice structure of stainless steel in seawater were numerically analyzed. The crevice corrosion phenomena were mathematically modeled with the initial boundary value problem of diffusion and static electrical field, respectively. This initial boundary value problem was discretized using a finite difference method. The predicts of the crevice corrosion behaviors, set for various external potentials and initial crevice gaps, were classified into three categories: the pitting type, the active type, and no corrosion. The pitting type crevice corrosion was predicted to occur in conditions where the external potentials were noble and the initial crevice gaps were narrow. The active type crevice corrosion was predicted to occur in conditions where the external potentials were less noble and the initial crevice gaps were narrow. The range of external potential conditions where crevice corrosion was predicted not to occur increased in conditions with wide initial crevice gaps. Crevice corrosion was predicted to occur at all external potentials in conditions where the initial crevice gaps were 2 μm or less.","PeriodicalId":17364,"journal":{"name":"Journal of The Electrochemical Society","volume":"45 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141740409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-14DOI: 10.1149/1945-7111/ad5976
Snehal Kolhekar, Michael Nyce and Sanjoy Banerjee
Achieving high cycle life rechargeable γ-MnO2 cathodes in alkaline batteries face many challenges. Chief among these is the inability of the γ-MnO2 polymorph to retain its structural integrity when cycled to high utilization of its theoretical capacity ∼300 mAh g−1. In this paper, we investigate the root cause of failure of MnO2 cathodes under deep cycling in the one-electron discharge range and establish a strong link between capacity fade and the amount of birnessite formed. We uncover the underlying cause of failure by cycling industrial scale γ-MnO2 cathodes at various levels of theoretical capacity utilization (100%, 50%, and 30%) and in different KOH concentrations (37, 25, and 10 wt%). To determine materials evolution the cycled cathodes were dissected, characterized and analyzed using SEM, XRD, FIB/SEM, EIS, and XPS. Based on our findings, we propose that one major cause of failure of MnO2 cathodes stems from the solubility of Mn+3 formed during discharge which effectively results in destruction of the γ-MnO2 phase and amorphization of the cathode. The results show that the bulk of the γ-MnO2 phase is preserved only in ∼10 wt% KOH, which indicates the attractive range of KOH concentration for cycling of rechargeable γ-MnO2 cathodes.
{"title":"The Dominant Effect of Electrolyte Concentration on Rechargeability of γ-MnO2 Cathodes in Alkaline Batteries","authors":"Snehal Kolhekar, Michael Nyce and Sanjoy Banerjee","doi":"10.1149/1945-7111/ad5976","DOIUrl":"https://doi.org/10.1149/1945-7111/ad5976","url":null,"abstract":"Achieving high cycle life rechargeable γ-MnO2 cathodes in alkaline batteries face many challenges. Chief among these is the inability of the γ-MnO2 polymorph to retain its structural integrity when cycled to high utilization of its theoretical capacity ∼300 mAh g−1. In this paper, we investigate the root cause of failure of MnO2 cathodes under deep cycling in the one-electron discharge range and establish a strong link between capacity fade and the amount of birnessite formed. We uncover the underlying cause of failure by cycling industrial scale γ-MnO2 cathodes at various levels of theoretical capacity utilization (100%, 50%, and 30%) and in different KOH concentrations (37, 25, and 10 wt%). To determine materials evolution the cycled cathodes were dissected, characterized and analyzed using SEM, XRD, FIB/SEM, EIS, and XPS. Based on our findings, we propose that one major cause of failure of MnO2 cathodes stems from the solubility of Mn+3 formed during discharge which effectively results in destruction of the γ-MnO2 phase and amorphization of the cathode. The results show that the bulk of the γ-MnO2 phase is preserved only in ∼10 wt% KOH, which indicates the attractive range of KOH concentration for cycling of rechargeable γ-MnO2 cathodes.","PeriodicalId":17364,"journal":{"name":"Journal of The Electrochemical Society","volume":"40 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141720522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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