Solid State Ionics最新文献

{"title":"SiO2 doped halogen-rich argyrodites for high-performance all-solid-state lithium–sulfur batteries","authors":"Jie-Fu Zhuo ,&nbsp;Zhi-Feng Yao","doi":"10.1016/j.ssi.2025.116813","DOIUrl":"10.1016/j.ssi.2025.116813","url":null,"abstract":"<div><div>The argyrodite-type sulfide electrolytes (Li₆PS₅X, X = Cl, Br, I) have demonstrated numerous benefits for high-performance and secure all-solid-state lithium‑sulfur batteries (ASSLSBs). These advantages include their rapid lithium (Li) ion conduction and exceptional compatibility with the anode. Nevertheless, despite these benefits, the key obstacles for their implementation are the need for higher room-temperature ionic conductivity, improved air/moisture compatibility, and enhanced electrochemical stability. In this study, we propose a halogen-rich argyrodite (Li_5.3PS_4.3Cl_1.7-xBr_x) to obtain ultrafast ionic conductivity at ambient temperature. To enhance the ionic transport channel, the anion disorder on the site is optimized and the Li vacancies in the structure are increased by substituting anions with halogens (Cl/Br). The Li_5.3PS_4.3Cl_0.85Br_0.85 is synthesized effectively by a high-energy ball milling process, resulting in a remarkable ionic conductivity of 9.07 mS⋅cm⁻¹ at room temperature. In addition, a SiO₂ dopant is utilized to strengthen the lattice structure of the solid-state electrolyte (Li_5.3+ySi_yP_1-yS_4.3-2yO_2yCl_0.85Br_0.85) in order to improve its resistance to air/moisture and enhance its electrochemical stability within specific voltage ranges. The Li_5.4Si_0.1P_0.9S_4.1O_0.2Cl_0.85Br_0.85 with optimized composition demonstrates an ionic conductivity of 8.2 mS⋅cm⁻¹ at room temperature and exceptional stability in air. The ASSLSBs containing Li_5.4Si_0.1P_0.9S_4.1O_0.2Cl_0.85Br_0.85 exhibit impressive specific capacities of 1191 mAh⋅g⁻¹ (0.1C after the initial cycle) and 989 mAh⋅g⁻¹ (0.1C after 100 cycles) at room temperature. Additionally, they demonstrate significant cyclability (83.04 % after 100 cycles) and excellent Coulombic efficiency (&gt;99.5 %). This study presents a novel strategy to promote the application of sulfide electrolytes in fabricating ASSLSBs.</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"423 ","pages":"Article 116813"},"PeriodicalIF":3.0,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620999","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":"Rational molecular design of partly fluorinated fuel cell membranes with high proton conductivity under low-humidity conditions","authors":"Haiyue Gong,&nbsp;Hannes Nederstedt,&nbsp;Seung-Young Choi,&nbsp;Patric Jannasch","doi":"10.1016/j.ssi.2025.116837","DOIUrl":"10.1016/j.ssi.2025.116837","url":null,"abstract":"<div><div>Research on proton exchange membranes (PEMs) is closely tied to the development of PEM fuel cells, and the need to overcome the shortcomings of perfluorosulfonic acid PEMs. One of the key challenges is to devise efficient molecular designs towards PEMs with sufficient durability and proton conductivity under reduced humidity. Here, we report on a series of partly fluorinated PEMs based on high-molecular weight poly(arylene tetrafluorophenylsulfonic acid)s, synthesized in polyhydroxyalkylations of perfluoroacetophenone and balanced mixtures of bipenyl and <em>p</em>-terphenyl. Sulfonic acid groups were then introduced on the pendant pentafluorophenyl groups of the resulting polymers through an efficient thiolation-oxidation procedure. The fluorine content of these aromatic polymers was approximately 1/6 of the Nafion® benchmark. Foldable flexible PEMs were produced by tape-casting and showed thermal stability up to 260 °C, as well as excellent radical resistance. The proton conductivity increased with the acid content, and the PEM based on merely biphenyl reached 250 mS cm⁻¹ at 120 °C under fully humidified conditions, exceeding Nafion® NR212 by a factor 1.6. Under 30 % relative humidity at 80 °C, the same PEM achieved an outstanding 50 mS cm⁻¹, surpassing Nafion® by a factor 2.3. With a considerably higher acidity and lower ion exchange capacity than typical sulfonated hydrocarbon polyphenylene PEMs such as Pemion®, and significantly lower fluorine content and higher conductivity than Nafion®, the characteristics of the present PEMs may offer distinct advantages for fuel cells operating under reduced humidity.</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"423 ","pages":"Article 116837"},"PeriodicalIF":3.0,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143611339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Construction organic composite gel polymer electrolyte for stable solid-state lithium metal batteries","authors":"Xianli Song ,&nbsp;Lipeng Yang ,&nbsp;Yi Liu ,&nbsp;Gongying Wang","doi":"10.1016/j.ssi.2025.116821","DOIUrl":"10.1016/j.ssi.2025.116821","url":null,"abstract":"<div><div>Gel polymer electrolytes (GPEs) synergizing the advantages of both solid and liquid electrolytes are promising electrolyte candidates for lithium metal batteries (LMBs). However, due to the presence of the liquid medium, mechanical performance and thermal stability are compromised. To address this issue, we designed and prepared an organic composite GPEs by immersing a PVDF-HFP fiber membrane in a polyIL-in-salt ionic solution. This process imparts exceptional high-temperature stability (decomposition temperature of 340 °C) and enhanced mechanical performance (Young's modulus of about 6.7 MPa) to the GPEs. The incorporation of polyIL-in-salt ionic solutions is found to enhance the ionic conductivity of GPEs to 0.69 mS cm⁻¹ at 25 °C, facilitating a homogeneous distribution and accelerating ionic migration. The Li||Li battery utilizing this electrolyte effectively alleviates the concentration polarization and achieves the stable cycle performance over 1200 h at 0.25 mA cm⁻² at 50 °C. Additionally, the lithium metal battery, which incorporates the organic composite gel polymer electrolytes, has exhibited an extraordinary specific capacity of 167.3 mAh g⁻¹, accompanied by a retention rate of 99.1 % at 50 °C, even after 100 cycles. This study asserts that the innovative organic composite GPEs exhibit considerable potential for practical applications in lithium metal batteries (LMBs).</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"423 ","pages":"Article 116821"},"PeriodicalIF":3.0,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143591906","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":"Investigation of the effects of magnetic field on the stability and transport properties of lithium ions","authors":"Guanqiang Ruan ,&nbsp;Yupeng Tian ,&nbsp;Jing Hua ,&nbsp;Zixi Liu ,&nbsp;Kuo Yang ,&nbsp;Xing Hu","doi":"10.1016/j.ssi.2025.116819","DOIUrl":"10.1016/j.ssi.2025.116819","url":null,"abstract":"<div><div>Lithium-ion battery is considered to be the most ideal energy storage material due to its high theoretical specific capacity and low reduction potential. However, the lithium dendrites generated during the charge and discharge cycling hinder its further application. Using density functional theory (DFT) and molecular dynamics methods, the lithium ions transport mechanism on the cathode of LiFePO₄ battery is studied. The influence of magnetic field on the stability and transport properties of lithium-ion battery surface is analyzed. The magnetic field could play a crucial role in enhancing the stability and transport of lithium ions at the interface by promoting a more orderly charge distribution and reinforcing the interfacial bonding. The results show that the magnetic field could effectively enhance the transport of lithium ions. When the magnetic induction intensity is 0.6 T, the surface stability of the electrode material could be effectively promoted, and the electrochemical performance of the battery is the best. In addition, after the introduction of magnetic field, the ion transport properties of the battery are improved. This leads to a reduction in the lithium-ion concentration at the anode, which in turn weakens the driving force and effectively inhibits the formation of lithium dendrites. This study could provide a deeper insight into the effects of magnetic field on lithium-ion battery compared to previous research, filling a gap in the existing knowledge base.</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"423 ","pages":"Article 116819"},"PeriodicalIF":3.0,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143577565","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 of two-dimensional Sc2N monolayer as an anode material for Na, K, Mg, and Ca ion batteries","authors":"Cheng-Wei Lv,&nbsp;Ming-Liang Qin,&nbsp;Yu-Pu He,&nbsp;Meng-Qian Wu,&nbsp;Qin-Sheng Zhu,&nbsp;Shao-Yi Wu","doi":"10.1016/j.ssi.2025.116820","DOIUrl":"10.1016/j.ssi.2025.116820","url":null,"abstract":"<div><div>With the continuous growth in global energy demand and the challenges posed by the intermittent nature of renewable energy, the development of efficient energy storage systems has become increasingly critical. This has spurred significant interest in non‑lithium metal-ion batteries and their high-performance anode materials. Based on first-principles calculations, this study systematically investigates the potential of Sc₂N monolayers as anode materials for Na, K, Mg, and Ca ion batteries. The results demonstrate that Sc₂N monolayers exhibit excellent mechanical, thermodynamic, and kinetic stability, along with outstanding electrical conductivity, making them good candidates for the next-generation anode materials. The theoretical capacities and open-circuit voltages of Sc₂N monolayers for metal ions are as follows: Na (1547.4 mAh/g, 0.321 V), K (343.9 mAh/g, 0.401 V), Mg (2063.2 mAh/g, 0.211 V), and Ca (458.5 mAh/g, 0.292 V). Sc₂N monolayers also exhibit low ion diffusion barriers of 10.1, 9.7, 32.3, and 38.3 meV for Na, K, Mg, and Ca, respectively. <em>Ab Initio</em> molecular dynamics (AIMD) simulations conducted at 300, 500, and 700 K under fully loaded Na and Mg conditions further confirm the excellent thermal stability of Sc₂N monolayers. Therefore, Sc₂N monolayers demonstrate high theoretical capacities, low diffusion barriers, and ideal open-circuit voltages for Na and Mg ion batteries, with superior safety features, underscoring their significant potential for applications in energy storage technologies.</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"423 ","pages":"Article 116820"},"PeriodicalIF":3.0,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143563078","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":"Ca1−xSrxMnO3−δ granules, pellets, foams: Influence of fabrication conditions and microstructure on oxidation kinetics","authors":"Lena Klaas ,&nbsp;Asmaa Eltayeb ,&nbsp;Dorottya Kriechbaumer ,&nbsp;Martin Roeb ,&nbsp;Christian Sattler","doi":"10.1016/j.ssi.2025.116803","DOIUrl":"10.1016/j.ssi.2025.116803","url":null,"abstract":"<div><div>Microstructure and oxidation kinetics are closely intertwined factors that significantly influence the behavior of materials in oxidative environments. This relationship is of particular importance for redox materials such as <span><math><msub><mi>Ca</mi><mrow><mn>1</mn><mo>−</mo><mi>x</mi></mrow></msub><msub><mi>Sr</mi><mi>x</mi></msub><msub><mi>MnO</mi><mrow><mn>3</mn><mo>−</mo><mi>δ</mi></mrow></msub></math></span>, where reversible oxygen ions exchange and oxidation state shifts are key to their functionality. In the first study, scanning electron microscope (SEM) was used to examine how varying Sr content affects the morphology and microstructure of <span><math><msub><mi>Ca</mi><mrow><mn>1</mn><mo>−</mo><mi>x</mi></mrow></msub><msub><mi>Sr</mi><mi>x</mi></msub><msub><mi>MnO</mi><mrow><mn>3</mn><mo>−</mo><mi>δ</mi></mrow></msub></math></span> powder compositions. The results indicate that increasing Sr content leads to smaller particle sizes and improved particle size homogeneity. Granules with Sr concentrations ranging from 0 % to 40 % exhibit notable changes in morphology. However, the microporosity and d50 vary slightly across the samples in a non-monotonic manner, with no clear trend emerging with respect to Sr concentration. The second study investigates how macrostructural forms, such as foams and pellets, impact oxidation kinetics in <span><math><msub><mi>Ca</mi><mn>0.8</mn></msub><msub><mi>Sr</mi><mn>0.2</mn></msub><msub><mi>MnO</mi><mrow><mn>3</mn><mo>−</mo><mi>δ</mi></mrow></msub></math></span>. Parameters including particle size distribution of the raw material, overall microporosity, and structural characteristics of these macrostructures were analyzed for their effect on oxidation rates. Findings reveal that macrostructural configuration, alongside microstructural features like microporosity, significantly impacts oxidation kinetics. These studies collectively underscore the critical relationship between dopant concentration, microstructural characteristics, and structural morphology in determining the oxidative behavior of <span><math><msub><mi>Ca</mi><mrow><mn>1</mn><mo>−</mo><mi>x</mi></mrow></msub><msub><mi>Sr</mi><mi>x</mi></msub><msub><mi>MnO</mi><mrow><mn>3</mn><mo>−</mo><mi>δ</mi></mrow></msub></math></span>, providing key insights into optimizing material performance in redox environments.</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"422 ","pages":"Article 116803"},"PeriodicalIF":3.0,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143561905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advanced battery cathode microstructure analysis through operando synchrotron X-ray tomography and super-resolution deep learning","authors":"Mohammad Javad Shojaei ,&nbsp;Abeiram Sivarajah ,&nbsp;Tayeba Safdar ,&nbsp;Oxana V. Magdysyuke ,&nbsp;Chu Lun Alex Leung ,&nbsp;Chun Huang","doi":"10.1016/j.ssi.2025.116818","DOIUrl":"10.1016/j.ssi.2025.116818","url":null,"abstract":"<div><div>Lithium ion batteries are pivotal for clean energy storage and mitigating climate change. In this study, we employ <em>operando</em> synchrotron X-ray computed tomography to investigate the dynamic evolution of battery cathode microstructure. We focus on tracking changes in porosity and pore size distribution at the microscale and cathode thickness at the macroscale during the lithiation and delithiation processes within a commercially configured battery. Image quality was enhanced using both conventional image processing methods and a Super-Resolution Convolutional Neural Network (SRCNN) model. Our findings revealed a slight increase in the cathode solid volume fraction and specific surface area as the battery transitioned from its pristine state to fully lithiated, followed by a reduction during delithiation. This behavior was attributed to the expansion of the cathode material and phase transitions during lithiation, which split larger pores into smaller ones, as evidenced by the increase in surface area. Cathode thickness also exhibited expansion during lithiation and contraction during delithiation. These results offer valuable insights into the structural changes that contribute to battery aging, helping researchers better understand how these different parameters change over time. This understanding is crucial for designing more durable and sustainable batteries in the future, both in terms of specific design and material selection, to enhance resistance during charge and discharge cycles to improve performance and longevity.</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"422 ","pages":"Article 116818"},"PeriodicalIF":3.0,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143549204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mixed-potential NH3 sensor with Fe2(MoO4)3 as the sensing electrode: Performance and mechanistic insights","authors":"Jingxin Wang,&nbsp;Hongming Liu,&nbsp;Hai Xiong,&nbsp;Jianzhong Xiao","doi":"10.1016/j.ssi.2025.116814","DOIUrl":"10.1016/j.ssi.2025.116814","url":null,"abstract":"<div><div>Ammonia (NH₃) is recognized as an important exhaled gas in patients with renal and hepatic diseases, with its concentration closely correlated to disease progression. Thus, detecting NH₃ in exhaled breath is crucial for self-diagnosis, disease monitoring, and large-scale screening of specific populations. In this study, we synthesized the sensing material iron molybdate (Fe₂(MoO₄)₃) and systematically investigated its performance in NH₃ detection. The results indicated that the sensor can realize the detection of 0.38 ppm NH₃, with the optimal sintering temperature identified as 550 °C and the optimal operating temperature as 475 °C. The response of the sensor to 5 ppm NH₃ is −24.3 ± 0.7 mV with response/recovery time of (55 ± 4)/ (86 ± 5) s. The X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscope (SEM) were applied to analysis the phase composition and morphology. The sensing mechanism was also discussed basing on the results of temperature-programmed desorption (TPD) and electrochemical impedance spectroscopy (EIS). Furthermore, the sensor exhibited reliable and stable performance across different test cycles, demonstrating its short-term and long-term stability.</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"422 ","pages":"Article 116814"},"PeriodicalIF":3.0,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143548650","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":"High concentrations of sodium dodecylbenzene sulfonate electrolyte additives improve the performance of aqueous zinc ion batteries","authors":"Qing-peng Bao ,&nbsp;Peng-cheng Tang ,&nbsp;Zhe Gong ,&nbsp;Peng-fei Wang ,&nbsp;Fa-nian Shi ,&nbsp;Min Zhu","doi":"10.1016/j.ssi.2025.116817","DOIUrl":"10.1016/j.ssi.2025.116817","url":null,"abstract":"<div><div>In aqueous zinc-ion batteries (AZIBs), traditional electrolytes are unable to fully utilise the potential of the zinc anode due to severe dendrite growth and side reactions on the zinc metal anode. Therefore, this study adds a high concentration of sodium dodecyl benzenesulfonate (SDBS) to the electrolyte to achieve the dual purpose of regulating the zinc deposition process and protecting the zinc substrate. The formation of large micelles induced by SDBS plays a stabilizing role, reduces fluctuations in the electrolyte, and enhances the orderly transfer of Zn²⁺, thereby increasing the amount of ion transfer. Furthermore, SDBS adsorbed on the zinc anode surface improves surface wettability, accelerates the three-dimensional diffusion process and guides Zn²⁺ to form a uniform flaky deposited layer. Additionally, the addition of SDBS effectively replaces the water-rich electric double layer (EDL) on the zinc surface with SDB⁻, significantly mitigating the harmful effects of H₂O on the anode. High-concentration SDBS therefore exhibits excellent performance in symmetrical batteries (over 2000 h at 0.8 mA cm⁻², 0.8 mAh cm⁻²). This study found that with the addition of a high concentration of surfactant, Zn²⁺ has a rapid three-dimensional diffusion process and horizontal deposition behavior, which is instructive for exploring ion transfer in high-concentration electrolyte additives.</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"422 ","pages":"Article 116817"},"PeriodicalIF":3.0,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143535391","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":"Structural phase transition behavior of tetragonal and orthorhombic SrFeO3-δ and its effects on thermal expansion and electrical conduction properties","authors":"Taizo Yoshino,&nbsp;Shiho Hatano,&nbsp;Takayuki Sugimoto,&nbsp;Kosuke Shido,&nbsp;Takuya Hashimoto","doi":"10.1016/j.ssi.2024.116768","DOIUrl":"10.1016/j.ssi.2024.116768","url":null,"abstract":"<div><div>Oxides with a high concentration of oxide-ion vacancies and high degree of crystal symmetry have attracted interest as high oxide-ion or hole and oxide-ion mixed conductors. For development of new oxide or mixed conductors, the structural phase transition of SrFeO_{3-<em>δ</em>} from tetragonal or orthorhombic perovskite with an ordered arrangement of oxide-ion vacancies to cubic perovskite with a random arrangement of oxide-ion vacancies was investigated via thermogravimetric-differential thermal analysis and X-ray diffraction at various temperatures. SrFeO_2.87 with tetragonal perovskite underwent the first-order structural phase transition to cubic perovskite without variation of <em>δ</em> at approximately 300 °C as has been frequently reported; however, the first-order structural phase transition of SrFeO_2.75 from orthorhombic to cubic without variation of <em>δ</em> occurred at approximately 420 °C, which was evidenced for the first time in this study. An abrupt increase was noted in both the thermal expansion and electrical conductivity with each phase transition. Our findings related to the effect of the structural phase transition on the thermal expansion and electrical conductivity of two different SrFeO_{3-<em>δ</em>} systems may guide their application as electrodes in solid oxide fuel cells and gas sensors.</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"422 ","pages":"Article 116768"},"PeriodicalIF":3.0,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143535394","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}