Solid State Ionics最新文献

{"title":"The electrochemical performance of electrodeposited nickel foam electrodes coated by nano-confined lithium borohydride-metal oxides composites","authors":"Dilara Kutluer ,&nbsp;Bilge Coşkuner Filiz ,&nbsp;Önder Yargı ,&nbsp;Ali Gelir ,&nbsp;Aysel Kantürk Figen","doi":"10.1016/j.ssi.2024.116657","DOIUrl":"10.1016/j.ssi.2024.116657","url":null,"abstract":"<div><p>In the present study, the electrochemical performance of the nickel (Ni)-foam electrodes (nano-confined-metal oxide composites: nc-SiO₂, nc-Al₂O₃, nc-MgO, nc-CaO) coated by electrodeposition via nano-confined lithium borohydride (nc-LiBH₄)-metal oxide (SiO₂, Al₂O₃, MgO, CaO) composites were investigated. Nano-confinement of LiBH₄ on metal-oxide structure approach was applied by a ball-milling process to prepare composites. The nc-metal oxide composites were electrodeposited on Ni foam using the chronoamperometry (CA) technique. The comparative study by cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) methods at different scan rates and current densities were used for electrochemical characterization of nc-metal oxide composites towards neat LiBH₄ and metal oxide. Cross-sectional analyses of scanning electron microscope elucidated that nc-CaO composite uniformly blankets the inner and outer surfaces of foam. These composites showed superior stability and reduced porosity in their surface structures, predominantly characterized by granular morphology and weak interparticle bonding, in contrast to other composite materials. Among CV curves, nc-CaO electrodeposited Ni foam electrode displayed a reduction of charge storage and lower capacitance values due to reduced porosity of nc-CaO composite towards LiBH₄ advanced in nano-confinement approach. Comparing specific capacitance of the electrodes first increased up to around 130 F/g and then decreased when metal oxides were added, while Ni electrodes prepared without nc-metal oxide composites showed an inverse relation with increasing current. The highest capacitance retention still after 2000 cycles achieved 85% stability.</p></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"415 ","pages":"Article 116657"},"PeriodicalIF":3.0,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141979553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydride prediction during late-stage oxidation of uranium in a water vapour environment","authors":"S.R. Monisha Natchiar ,&nbsp;Richard E. Hewitt ,&nbsp;Phillip D.D. Monks","doi":"10.1016/j.ssi.2024.116651","DOIUrl":"10.1016/j.ssi.2024.116651","url":null,"abstract":"&lt;div&gt;&lt;p&gt;We present a reaction-advection-diffusion (RAD) model for (low temperature) uranium oxidation in a water-vapour environment, where both &lt;span&gt;&lt;math&gt;&lt;msup&gt;&lt;mi&gt;OH&lt;/mi&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;/msup&gt;&lt;/math&gt;&lt;/span&gt; and &lt;span&gt;&lt;math&gt;&lt;msup&gt;&lt;mi&gt;H&lt;/mi&gt;&lt;mo&gt;•&lt;/mo&gt;&lt;/msup&gt;&lt;/math&gt;&lt;/span&gt; are diffusing. In this model an intermediate &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mi&gt;UH&lt;/mi&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; phase sits between the bulk &lt;span&gt;&lt;math&gt;&lt;mi&gt;U&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt; metal and a protective surface &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mi&gt;UO&lt;/mi&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; layer. This surface oxide layer only remains adhered up to a maximum depth &lt;span&gt;&lt;math&gt;&lt;msubsup&gt;&lt;mi&gt;Δ&lt;/mi&gt;&lt;mi&gt;adh&lt;/mi&gt;&lt;mo&gt;∗&lt;/mo&gt;&lt;/msubsup&gt;&lt;/math&gt;&lt;/span&gt; before spallation occurs leading to significantly increased diffusive transport across the spalled layer. Under these conditions, this mechanistic model is shown to support &lt;em&gt;both&lt;/em&gt; a parabolic (&lt;span&gt;&lt;math&gt;&lt;mo&gt;∝&lt;/mo&gt;&lt;msqrt&gt;&lt;mi&gt;t&lt;/mi&gt;&lt;/msqrt&gt;&lt;/math&gt;&lt;/span&gt;) oxide growth up to the point of spallation, before smoothly transitioning to a linear (&lt;span&gt;&lt;math&gt;&lt;mo&gt;∝&lt;/mo&gt;&lt;mi&gt;t&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt;) oxidation solution at later times. In the late-stage linear regime, a &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mi&gt;UO&lt;/mi&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msub&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;msub&gt;&lt;mi&gt;UH&lt;/mi&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; interface propagates into the bulk metal at a constant velocity of&lt;span&gt;&lt;span&gt;&lt;span&gt;&lt;math&gt;&lt;mfrac&gt;&lt;mrow&gt;&lt;msubsup&gt;&lt;mi&gt;D&lt;/mi&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;mrow&gt;&lt;mfenced&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/mfenced&gt;&lt;mo&gt;∗&lt;/mo&gt;&lt;/mrow&gt;&lt;/msubsup&gt;&lt;msup&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;mo&gt;∗&lt;/mo&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;msubsup&gt;&lt;mi&gt;Δ&lt;/mi&gt;&lt;mi&gt;adh&lt;/mi&gt;&lt;mo&gt;∗&lt;/mo&gt;&lt;/msubsup&gt;&lt;msubsup&gt;&lt;mi&gt;N&lt;/mi&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;mo&gt;∗&lt;/mo&gt;&lt;/msubsup&gt;&lt;/mrow&gt;&lt;/mfrac&gt;&lt;mo&gt;;&lt;/mo&gt;&lt;/math&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;&lt;p&gt;&lt;span&gt;&lt;math&gt;&lt;msubsup&gt;&lt;mi&gt;D&lt;/mi&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;mrow&gt;&lt;mfenced&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/mfenced&gt;&lt;mo&gt;∗&lt;/mo&gt;&lt;/mrow&gt;&lt;/msubsup&gt;&lt;/math&gt;&lt;/span&gt; being the diffusion coefficient of &lt;span&gt;&lt;math&gt;&lt;msup&gt;&lt;mi&gt;OH&lt;/mi&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;/msup&gt;&lt;/math&gt;&lt;/span&gt; in &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mi&gt;UO&lt;/mi&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; and &lt;span&gt;&lt;math&gt;&lt;msup&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;mo&gt;∗&lt;/mo&gt;&lt;/msup&gt;&lt;mo&gt;/&lt;/mo&gt;&lt;msubsup&gt;&lt;mi&gt;N&lt;/mi&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;mo&gt;∗&lt;/mo&gt;&lt;/msubsup&gt;&lt;/math&gt;&lt;/span&gt; the peak relative concentration of &lt;span&gt;&lt;math&gt;&lt;msup&gt;&lt;mi&gt;OH&lt;/mi&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;/msup&gt;&lt;/math&gt;&lt;/span&gt; to &lt;span&gt;&lt;math&gt;&lt;mi&gt;U&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt;. This model predicts that the intermediate hydride layer approaches a constant thickness in the linear regime, with a &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mi&gt;UH&lt;/mi&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/msub&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;mi&gt;U&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt; interface propagating into the bulk metal at the same velocity. The length scale of this emergent hydride layer is shown to be most sensitive to the diffusivity of &lt;span&gt;&lt;math&gt;&lt;msup&gt;&lt;mi&gt;OH&lt;/mi&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;/msup&gt;&lt;/math&gt;&lt;/span&gt; in &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mi&gt;UH&lt;/mi&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; and the corresponding reaction rate constant. Plausible parameter values are shown to lead to hydride layers &lt;span&gt;&lt;math&gt;&lt;mo&gt;&lt;&lt;/mo&gt;&lt;mn&gt;10&lt;/mn&gt;&lt;/math&gt;&lt;/span&gt; nm for room temperature oxidation in a vapour pressure of 20 Torr (&lt;span&gt;&lt;math&gt;&lt;msubsup&gt;&lt;mi&gt;Δ&lt;/mi&gt;&lt;mi&gt;adh&lt;/mi&gt;&lt;mo&gt;∗&lt;/mo&gt;&lt;/msubsup&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;50&lt;","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"415 ","pages":"Article 116651"},"PeriodicalIF":3.0,"publicationDate":"2024-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141948931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modifications to the spreading resistance equation when using micro-contact impedance spectroscopy to measure resistive surface layers.","authors":"Hong Ma ,&nbsp;Derek C. Sinclair ,&nbsp;Julian S. Dean","doi":"10.1016/j.ssi.2024.116652","DOIUrl":"10.1016/j.ssi.2024.116652","url":null,"abstract":"<div><p>Micro-contact impedance spectroscopy (mcIS) is a powerful tool that can allow local features such as grain boundaries and surfaces in electro-ceramics to be directly interrogated. Typical macroscopic electrodes fully cover the specimen surfaces and data are converted from resistance into conductivity using a geometric correction factor based on the surface area of the electrodes and thickness of the sample. For mcIS measurements this requires a different approach. The conversion factor required in this case is that for a spreading resistance and the correction factor depends on the radius (r) and separation of the micro-contacts. When dealing with conversions for samples with a resistive surface layer, two extreme scenarios exist depending on the thickness of the surface layer (T) and the arrangement and size of the contacts. When the resistive layer is thin (T/<em>r</em> &lt; 10) the geometric correction factor provides accurate conductivities but for thick layers (T/<em>r</em> &gt; 10) the spreading resistance correction equation is required. When the surface layer is an intermediate thickness however neither provides a good estimate for conductivity.</p><p>Using finite element modelling we simulate resistive surface layer systems using a top-top micro-contact arrangement and show that instead of using either of the two separate correction equations, a single modified spreading resistance equation can be used on the resulting impedance data to provide greater accuracy and simplicity in the extraction of conductivity. With this modified correction factor, when the ratio of bulk material conductivity <em>versus</em> surface layer conductivity (σ_b/σ_s) is ≥100, σ_s can be calculated for any surface layer thickness. When the ratio is &lt;100, only when (T/r) is &gt;3 can σ_s be accurately estimated.</p></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"414 ","pages":"Article 116652"},"PeriodicalIF":3.0,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141949055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing electrochemical performance of alginate–PVA solid blend electrolytes via H+ ion doping for supercapacitor applications","authors":"N.M. Ghazali ,&nbsp;N.F. Mazuki ,&nbsp;M.H. Sulaiman ,&nbsp;K. Aoki ,&nbsp;Y. Nagao ,&nbsp;A.S. Samsudin","doi":"10.1016/j.ssi.2024.116650","DOIUrl":"10.1016/j.ssi.2024.116650","url":null,"abstract":"<div><p>This study investigates the enhancement of electrochemical performance in alginate–polyvinyl alcohol (PVA) solid blend electrolytes through H⁺ ion doping for supercapacitor applications. Employing the solution casting method, we tailored electrolyte systems doped with nitric acid (HNO₃). Impedance studies reveal a substantial increase in ionic conductivity (2.71 × 10⁻⁴ S cm⁻¹ at room temperature) with 3 M HNO₃ doping. Fourier-transform infrared spectroscopy and transference number measurements confirm the effective protonation of the polymer matrix. Temperature-dependent behavior analysis demonstrates robust performance across various thermal conditions. Linear sweep voltammetry studies showcase excellent electrochemical stability, while galvanostatic charge-discharge profiles exhibit reliable cyclic performance, with an average specific capacitance of approximately 6.76 F/g. This research underscores the potential of tailored solid blend electrolytes doped with H⁺ ions to elevate supercapacitor technology.</p></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"414 ","pages":"Article 116650"},"PeriodicalIF":3.0,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141948932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ceria‑iron electrocatalysts for ammonia electrosynthesis using protonic ceramic electrolysis cells","authors":"Moe Okazaki ,&nbsp;Junichiro Otomo","doi":"10.1016/j.ssi.2024.116649","DOIUrl":"10.1016/j.ssi.2024.116649","url":null,"abstract":"<div><p>Iron has proven to be a simple yet high-performing electrode for ammonia electrosynthesis, particularly when used with protonic ceramic electrolysis cells. On a proton-conducting BaCe_0.9Y_0.1O_3−δ (BCY) electrolyte, iron oxide forms an interfacial layer during sintering due to solid-state cation diffusion. In this work, we found that the ceria‑iron layer that is formed in-situ both enables electrode adhesion and is active for ammonia electrosynthesis. Cells with electrodes fabricated from CeO₂-Fe₂O₃ at a weight ratio of 1:1 (CeFe11) and 6:1 (CeFe61), designed to replicate the composition of the interfacial layer, resulted in ammonia formation rates similar to those of cells with pure Fe electrodes, reaching 1.1–1.2 × 10⁻⁸ mol s⁻¹ cm⁻² at an applied voltage of −1 V at 600 °C. The ceria‑iron catalysts exhibited higher catalytic activity and a moderate electrochemical activity. A comparison of these electrodes suggests that the regions where ceria and iron are in proximity are the most active for ammonia electrosynthesis. Furthermore, CeFe11 demonstrates similar ammonia formation rates on BaZr_0.1Ce_0.7Y_0.1Yb_0.1O_3−δ (BZCYYb1711) as on BCY; as BZCYYb is more stable than BCY in the presence of water vapor, the development of ceria‑iron electrodes could widen the application of iron-based electrodes to ammonia electrosynthesis combined with water electrolysis.</p></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"414 ","pages":"Article 116649"},"PeriodicalIF":3.0,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141949056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A first-principles research on the properties of two-dimensional penta-BP2 as an anode material for both Na and K ion batteries","authors":"Tian-Hao Guo ,&nbsp;Shao-Yi Wu ,&nbsp;Qi-Hang Qiu ,&nbsp;Xiao-Xu Yang ,&nbsp;Jie Su ,&nbsp;Hui-Ning Dong ,&nbsp;Qin-Sheng Zhu","doi":"10.1016/j.ssi.2024.116647","DOIUrl":"10.1016/j.ssi.2024.116647","url":null,"abstract":"<div><p>The escalating demand for large-scale energy storage solutions has sparked significant interest in metal-ion batteries, particularly in the realm of high-performance anode materials. This work explores the potential of penta-BP₂ as an anode material for sodium and potassium-ion batteries through first-principles calculations. The two-dimensional metallic structure of penta-BP₂ exhibits favorable electrical conductivity, making it an ideal candidate for anode materials. Theoretical analysis reveals that penta-BP₂ can adsorb two layers of Na and three layers of K, resulting in high storage capacities of 1105 and 1473 mAh/g, along with low open-circuit voltages of 0.40 and 0.30 V, respectively. These characteristics enable the production of high energy density in sodium and potassium-ion batteries. Additionally, the material's small Young's modulus and low diffusion energy barriers further establish penta-BP₂ as a flexible anode material capable of rapid charge/discharge processes.</p></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"414 ","pages":"Article 116647"},"PeriodicalIF":3.0,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141948933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multidoped CeO2 single-phase as electrolyte for IT-SOFC","authors":"Marija Stojmenović ,&nbsp;Neda Nišić ,&nbsp;Milan Kragović ,&nbsp;Jelena Gulicovski ,&nbsp;Francesco Basoli ,&nbsp;Danica Bajuk-Bogdanović ,&nbsp;Milan Žunić","doi":"10.1016/j.ssi.2024.116645","DOIUrl":"10.1016/j.ssi.2024.116645","url":null,"abstract":"<div><p>This paper explores the application of nanosized, sintered, non-stoichiometric CeO₂ with six dopants Ce_0.8Nd_0.0025Sm_0.0025Gd_0.005Dy_0.095Y_0.095O_2-δ (CNSGDY), synthesized via modified glycine-nitrate procedure (MGNP) and room temperature self-propagating reaction (SPRT) for fuel cells. The composition, microstructure, and morphology of CNSGDY samples were analyzed using XRD, Raman spectroscopy, SEM, and EDS. The concentration of O²⁻ vacancies, enabling the improvement of ionic conduction, was measured by the deconvolution procedure of additional Raman modes (250 cm⁻¹ (2TA), 560 cm⁻¹ (2LA) and 610 cm⁻¹ (2TO)) and total values for MGNP and SPRT CNSGDY were 15.89% and 16.06%, respectively. Electrochemical performance assessed through EIS ((Electrochemical Impedance Spectroscopy) in the 550–700 °C range revealed a maximum power density of 55 mWcm⁻² at 700 °C with SPRT electrolyte. Additionally, the ionic conductivity of the samples was calculated, with the SPRT sample showing superior performance due to higher ionic conductivity values. Differences in power densities between Pt/SPRT/Pt and Pt/MGNP/Pt cells suggest electrode-electrolyte interface and film thickness impacts, guiding future research.</p></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"414 ","pages":"Article 116645"},"PeriodicalIF":3.0,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141948934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of polypyrrole coating on the electrochemical properties of Li1.04Fe0.3Mn0.7PO4 cathode materials","authors":"Rui He ,&nbsp;Xue Bai ,&nbsp;Aijia Wei ,&nbsp;Lijing Sun ,&nbsp;Lihui Zhang ,&nbsp;Guanyu Zhao ,&nbsp;Qinglong Yuan ,&nbsp;Jinping Mu ,&nbsp;Xi Zhang ,&nbsp;Zhenfa Liu","doi":"10.1016/j.ssi.2024.116648","DOIUrl":"10.1016/j.ssi.2024.116648","url":null,"abstract":"<div><p>In this work, polypyrrole (PPy) was used to modify Li_1.04Fe_0.3Mn_0.7PO₄ cathode materials and improve their conductivity. This study found that PPy could form a coating layer and conductive network on the material surface and effectively enhance the conductivity of the material as well as stability of the electrolyte interface. When the amount of PPy addition was 2%, the capacity retention rate at 0.2C and 20 °C was 98.6% after 500 cycles, and the capacity retention rate at −15 °C was 89.0% after 200 cycles. The capacity retention rate of the 2% PPy coated Li_1.04Fe_0.3Mn_0.7PO₄ sample was 20.4% higher than that of the pure Li_1.04Fe_0.3Mn_0.7PO₄ sample after 200 cycles at −15 °C.</p></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"414 ","pages":"Article 116648"},"PeriodicalIF":3.0,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141778153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Surrogate modeling for transient electrochemical potential analysis for SOFC using proper orthogonal decomposition","authors":"Masami Sato ,&nbsp;Mayu Muramatsu ,&nbsp;Kenta Tozato ,&nbsp;Shuji Moriguchi ,&nbsp;Tatsuya Kawada ,&nbsp;Kenjiro Terada","doi":"10.1016/j.ssi.2024.116642","DOIUrl":"10.1016/j.ssi.2024.116642","url":null,"abstract":"<div><p>This study presents a procedure for creating a surrogate model for the transient electrochemical potential analysis of solid oxide fuel cells (SOFCs) by applying proper orthogonal decomposition (POD), which takes into account the characteristics of the spatial distribution of oxygen potential. In the proposed procedure, the time-variation of oxygen potential distributions in an SOFC are determined by numerical simulations under various analytical conditions with different explanatory variables or, equivalently, input parameters, and the results are stored in a separate data matrix for each component in accordance with certain rules. Then, POD is applied to each data matrix to create an individual surrogate model for the corresponding component using the dominant modes on the basis of contribution rates and/or mean square errors. The created models are used separately to obtain the oxygen potential distribution in the entire domain of the SOFC for an arbitrary set of input parameters at a low computational cost. A notable aspect of the proposed approach is that the positions and values of oxygen potential in two electrodes and interconnectors are data points and responses, respectively, but play opposite roles in the electrolyte region where the oxygen potential changes abruptly. Therefore, before combining the responses from the individual surrogate models, the oxygen potential values must be calculated backward from the coordinate values in the electrolyte. Representative numerical examples are presented to validate the appropriateness of the analysis procedure by applying the surrogate models with input parameters other than those used in the training process in comparison with the results obtained using the transient electrochemical potential.</p></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"414 ","pages":"Article 116642"},"PeriodicalIF":3.0,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141778154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dependence of electrical properties on the concentration of tantalum in ceramics Li0.12Na0.88TayNb1-yO3 (y = 0.15, 0.2, 0.25) obtained at high pressure","authors":"Vadim Efremov,&nbsp;Mikhail Palatnikov,&nbsp;Olga Shcherbina,&nbsp;Diana Manukovskaya","doi":"10.1016/j.ssi.2024.116646","DOIUrl":"10.1016/j.ssi.2024.116646","url":null,"abstract":"<div><p>We have obtained for the first time ferroelectric solid solutions (i.e. ceramic) Li_0.12Na_0.88Ta_yNb_1-yO₃ (y = 0.15, 0.2, 0.25) with the perovskite structure under conditions of high pressures and temperatures. Their electrophysical characteristics have been studied. It has been established that the solid solutions ceramic samples have an orderly distorted crystal structure. The values of static specific conductivities have been determined as functions of temperature, the activation energy of charge carriers, and the real part of the permittivity. It has been established that the samples experience a number of successive phase transitions. For example, P → R → S(T₂). It has been found that the electrical conductivity increases when the content of tantalum increases. The Li_0.12Na_0.88Ta_0.25Nb_0.75O₃ ceramic sample has atypically high electrical conductivity values (close to high ionic conductivity) for this class of solid solutions over the entire studied temperature range. At the same time, the phase is metastable, and heating above the Curie temperature leads to its gradual destruction.</p></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"414 ","pages":"Article 116646"},"PeriodicalIF":3.0,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141729344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}