Materials Science and Engineering: B最新文献_第2页

Er–Tm co-doped δ-Bi₂O₃ electrolytes: structural stability and high oxide-ion conductivity for IT-SOFC applications Er-Tm共掺杂δ-Bi₂O₃电解质：用于IT-SOFC应用的结构稳定性和高氧化离子电导率

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B

Pub Date : 2026-01-28 DOI: 10.1016/j.mseb.2026.119259

Yasin Polat , İsmail Çalikuşu

In this study, (Bi₂O₃)₁₋ₓ₋ᵧ(Er₂O₃)ₓ(Tm₂O₃)ᵧ ternary solid solutions were synthesized via a solid-state reaction method to achieve high oxygen-ion conductivity and phase stability for intermediate-temperature solid oxide fuel cells (IT-SOFCs). High-purity Bi₂O₃, Er₂O₃, and Tm₂O₃ powders were mixed in stoichiometric ratios and subjected to calcination, pressing, and sintering steps. Their structural, thermal, and electrical properties were then examined in detail. X-ray diffraction (XRD) analysis confirmed that all samples retained the δ-Bi₂O₃ phase at room temperature, indicating the formation of a single-phase crystalline structure. Crystallite size calculations revealed that increasing the dopant concentration reduced the grain size to the 35–45 nm range and intensified lattice defects. Electrical conductivity measurements exhibited Arrhenius-type behavior with distinct activation energies in the low- and high-temperature regimes. Notably, the E5T composition (20 mol% Er₂O₃ – 5 mol% Tm₂O₃) achieved the highest conductivity of approximately 1.14 × 10⁻¹ Ω⁻¹·cm⁻¹ at 750 °C and the lowest activation energy of 1.33 eV. Thermogravimetric (TG) and differential thermal analysis (DTA) results showed no significant mass loss between 100 and 600 °C and revealed no clear endothermic or exothermic peaks associated with phase transitions, confirming excellent thermal stability. These findings demonstrate that co-doping with Er and Tm enhances both the oxygen-ion conductivity and the long-term thermal durability of δ-Bi₂O₃-based systems. Such characteristics position these materials as a strong alternative to conventional YSZ electrolytes for high-performance IT-SOFC applications operating at lower temperatures.

在本研究中，通过固相反应法合成了（Bi₂O₃）₁₁ₓ₁ᵧ（Er₂O₃）ₓ（Tm₂O₃）ᵧ三元固溶体，以实现中温固体氧化物燃料电池（IT-SOFCs）的高氧离子电导率和相稳定性。高纯度的Bi₂O₃、Er₂O₃和Tm₂O₃粉末按化学计量比混合，并经过煅烧、压制和烧结步骤。然后详细检查了它们的结构、热学和电学性能。x射线衍射（XRD）分析证实，所有样品在室温下都保留了δ-Bi₂O₃相，表明形成了单相晶体结构。晶粒尺寸计算表明，随着掺杂浓度的增加，晶粒尺寸减小到35 ~ 45 nm范围内，晶格缺陷加剧。电导率测量显示出在低温和高温条件下具有不同活化能的arrhenius型行为。值得注意的是，E5T组成（20 mol% Er₂O₃- 5 mol% Tm₂O₃）在750℃时获得了最高的电导率，约为1.14 × 10−1 Ω−1·cm−1，最低的活化能为1.33 eV。热重（TG）和差热分析（DTA）结果显示，在100至600°C之间没有明显的质量损失，也没有明显的与相变相关的吸热或放热峰，证实了优异的热稳定性。这些发现表明，Er和Tm的共掺杂提高了δ-Bi₂O₃基体系的氧离子电导率和长期热耐久性。这些特性使这些材料成为传统YSZ电解质的强大替代品，可用于在较低温度下工作的高性能IT-SOFC应用。

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引用次数: 0

Mn4+-doped Sr2CaWO6 red phosphors for enhanced forensic fingerprint analysis Mn4+掺杂Sr2CaWO6红色荧光粉用于增强法医指纹分析

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B

Pub Date : 2026-01-28 DOI: 10.1016/j.mseb.2026.119257

Sung Jun Park , Woo Tae Hong , Hyun Kyoung Yang

Mn⁴⁺ doped Sr₂CaWO₆ phosphors with different Mn⁴⁺ ion concentration (0.1, 0.3, 0.5, 0.7, 1.0, and 3.0 mol%) were synthesized using solid-state reaction method. The structure, composition, morphology, and photoluminescence of Sr₂CaWO₆:Mn⁴⁺ phosphors were investigated in this experiment. The Sr₂CaWO₆:Mn⁴⁺ phosphors have a well-crystallized structure. The particle size of Sr₂CaWO₆:Mn⁴⁺ phosphors is about several micrometers. The band gap value for Sr₂CaWO₆:Mn⁴⁺ phosphors is 3.70 eV. Sr₂CaWO₆:Mn⁴⁺ phosphors showed a deep red emission centered at 687 nm under excitation at 320 nm. The optimal doping concentration of Sr₂CaWO₆:Mn⁴⁺ phosphors was found to be 0.7 mol%. The prepared phosphors were employed for fingerprint visualization on several substrates (stainless steel, glass, plastic card, and currency), resulting in improved resolution of the fingerprint patterns. The detailed patterns of fingerprint with different levels (1–3) can be clearly observed. These results show that Sr₂CaWO₆:Mn⁴⁺ phosphors have promising applications for latent fingerprint detection.

采用固相反应法制备了不同Mn4+离子浓度（0.1、0.3、0.5、0.7、1.0、3.0 mol%）的Sr2CaWO6荧光粉。本实验研究了Sr2CaWO6:Mn4+荧光粉的结构、组成、形态和光致发光性能。Sr2CaWO6:Mn4+荧光粉具有良好的结晶结构。Sr2CaWO6:Mn4+荧光粉的粒径约为几微米。Sr2CaWO6:Mn4+荧光粉带隙值为3.70 eV。Sr2CaWO6:Mn4+荧光粉在320 nm激发下显示出以687nm为中心的深红色发光。发现Sr2CaWO6:Mn4+荧光粉的最佳掺杂浓度为0.7 mol%。将所制备的荧光粉用于多种基材（不锈钢、玻璃、塑料卡片和货币）上的指纹显示，提高了指纹图案的分辨率。可以清晰地观察到不同层次（1-3）指纹的详细纹样。这些结果表明Sr2CaWO6:Mn4+荧光粉在潜在指纹检测中具有很好的应用前景。

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引用次数: 0

Synergistic effects of additive and current density on the 3D porous architecture of electrodeposited NiP electrode for enhanced hydrogen evolution reaction 添加剂和电流密度对电沉积NiP电极三维多孔结构的协同作用，以增强析氢反应

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B

Pub Date : 2026-01-28 DOI: 10.1016/j.mseb.2026.119234

Nada Boumazza , Yazid Messaoudi , Wissem Boughouiche , Hamza Belhadj , Pauline Haraux , Abdelkrim Redjaimia , Mohamed R. Khelladi , Amor Azizi

Tailoring porosity in electrocatalysts is an effective strategy for enhancing the hydrogen evolution reaction (HER) by increasing the active surface area and improving charge transport. In this study, three-dimensional (3D) porous NiP electrodes were fabricated via a simple electrodeposition process using varying concentrations of the (NH₄)₂SO₄ additive and different deposition current densities to control surface morphology and porosity. The results demonstrate that the (NH₄)₂SO₄ plays a crucial role in regulating the porous architecture of NiP deposits. An optimal additive concentration of 0.5 M yields a high-density porous network that expose abundant active sites and facilitates charge transfer kinetics. The optimized Ni-P_A0.50-j400 electrode exhibits excellent HER activity in 1 M KOH, requiring an overpotential of only −105 mV to achieve a current density of −10 mA.cm⁻², with a Tafel slope of 79 mV.dec⁻¹. Moreover, increasing the deposition current density further enhances catalytic performance by reducing pore sizes and enlarging the electrochemically active surface area (ECSA). The Ni-P_A0.50-j600 electrode, characterized by an average pore size of 16.85 μm, achieves −10 mA.cm⁻² at an overpotential of −71 mV and demonstrates excellent long-term stability over 30 h. This work provides clear insight into the synergistic effects of additive concentration and current density in tailoring NiP porosity, highlighting the intrinsic relationship between pore architecture and catalytic efficiency for high-performance HER electrocatalysts.

调整电催化剂的孔隙度是通过增加活性表面积和改善电荷输运来促进析氢反应的有效策略。在本研究中，使用不同浓度的（NH4）2SO4添加剂和不同的沉积电流密度来控制表面形貌和孔隙率，通过简单的电沉积工艺制备三维（3D）多孔NiP电极。结果表明，（NH4）2SO4在调节NiP沉积物的多孔结构中起着至关重要的作用。最佳添加剂浓度为0.5 M可形成高密度的多孔网络，暴露出丰富的活性位点，促进电荷转移动力学。优化后的Ni-PA0.50-j400电极在1 M KOH条件下表现出优异的HER活性，仅需- 105 mV过电位即可达到- 10 mA.cm - 2的电流密度，Tafel斜率为79 mV.dec - 1。此外，增加沉积电流密度可以通过减小孔隙大小和扩大电化学活性表面积（ECSA）来进一步提高催化性能。Ni-PA0.50-j600电极的平均孔径为16.85 μm，在过电位为- 71 mV时达到- 10 mA.cm - 2，并在30 h内表现出优异的长期稳定性。这项工作为添加剂浓度和电流密度在调节NiP孔隙率方面的协同作用提供了清晰的认识，突出了孔隙结构与高性能HER电催化剂催化效率之间的内在关系。

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引用次数: 0

Engineering Fe/Zn-doped TiO₂ semiconductors for solar driven selective conversion of acetaminophen into a functional bioactive intermediate 工程Fe/ zn掺杂tio2半导体，用于太阳能驱动对乙酰氨基酚选择性转化为功能性生物活性中间体

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B

Pub Date : 2026-01-27 DOI: 10.1016/j.mseb.2026.119237

Wided Salah , Vicente Montes , Francisco J. López-Tenllado , Maria Carmen Herrera-Beurnio , Wahid Djeridi , Leila Elsellami

Pharmaceutical residues are among the most persistent contaminants in aquatic environments, demanding advanced yet sustainable treatment solutions. This study introduces a solar-driven photocatalytic process that not only degrades acetaminophen efficiently but also selectively converts it into a stable and valuable hydroxylated intermediate, 3-hydroxyacetaminophen (3-HAP). Fe- and Zn-doped TiO₂ photocatalysts (5 wt%) were synthesized via the sol–gel method, characterized using XRD, DRS, and SEM-EDS, and evaluated under solar irradiation to simulate realistic water treatment conditions. High-performance liquid chromatography confirmed 3-HAP as the main transformation product, generated exclusively through hydroxyl radical (^•OH) oxidation. The selectivity strongly depends on photocatalyst composition and pH: TiO₂–Fe achieved 83% selectivity at pH 9, while TiO₂–Zn reached 59% at neutral pH. Beyond pollutant removal, this intermediate exhibits structural stability and redox functionality, making it a promising active molecule for the design of electrochemical probes and biosensors related to oxidative stress detection. These results highlight a sustainable and circular approach to pharmaceutical wastewater remediation, where solar photocatalysis enables both environmental purification and the generation of value-added functional molecules opening new perspectives in green water process engineering.

药物残留是水生环境中最持久的污染物之一，需要先进但可持续的处理解决方案。本研究介绍了一种太阳能驱动的光催化过程，该过程不仅可以有效地降解对乙酰氨基酚，而且可以选择性地将其转化为稳定且有价值的羟基化中间体3-羟基对乙酰氨基酚（3-HAP）。采用溶胶-凝胶法合成了Fe和zn掺杂的tio2光催化剂（5 wt%），利用XRD， DRS和SEM-EDS对其进行了表征，并在太阳辐照下模拟了真实的水处理条件。高效液相色谱法证实3-HAP为主要转化产物，仅通过羟基自由基（•OH）氧化生成。选择性很大程度上取决于光催化剂的组成和pH值：tio2 -Fe在pH值为9时的选择性为83%，而tio2 -Zn在中性pH下的选择性为59%。除了去除污染物外，这种中间体还具有结构稳定性和氧化还原功能，使其成为设计与氧化应激检测相关的电化学探针和生物传感器的有前途的活性分子。这些结果强调了一种可持续和循环的制药废水修复方法，其中太阳能光催化既可以净化环境又可以产生增值功能分子，为绿色水处理工程开辟了新的前景。

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引用次数: 0

Dual modification of Fe/nickel foam by interface engineering and low-loading Pt for enhanced overall water splitting 界面工程和低负荷Pt双重改性Fe/ni泡沫材料增强整体水分解

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B

Pub Date : 2026-01-27 DOI: 10.1016/j.mseb.2026.119220

Ruiling Hu , Lingping Jiang , Yaxin Wang , Aoxing Zhao , Min Zhao , Congrong Wang , Miao Zhang , Lei Yang , Wanbing Gong , Jianguo Lv

Rational design and construction of inexpensive and efficient bi-functional electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are crucial for overall water splitting (OWS). In this study, bifunctional electrocatalyst Pt-Fe₂O₃/FeO/NF-0.01 (Pt-Fe/NF-0.01) was prepared via the two-step electrodeposition method. The stacking of interlaced nanosheetson as well as Pt modification can increase the active sites and expose them, transfer matter and charge as well as reduce adsorption energy of different intermediates, thus enhancing HER and OER of Pt-Fe/NF-0.01, which just needs 122 and 172 mV to attain 100 mA cm⁻² in 1 M KOH solution. The assembled cell using Pt-Fe/NF-0.01 both as cathode and anode can achieve 10 and 100 mA cm⁻² at low voltage of 1.41 and 1.56 V, much lower than those of Pt/C//IrO₂:RuO₂ (1.54 @10 mA cm⁻² and 1.77 @100 mA cm⁻²). The electric potential decay of the Pt-Fe/NF-0.01/ Pt-Fe/NF-0.01 cell can be ignored after continuous reaction at 100 mA cm⁻² for 48 h. This study points out the direction for constructing inexpensive and efficient bi-functional electrocatalysts for OWS devices.

合理设计和构建廉价高效的析氢反应和析氧反应双功能电催化剂是实现整体水分解的关键。本研究采用两步电沉积法制备了双功能电催化剂Pt-Fe2O3/FeO/NF-0.01 （Pt-Fe/NF-0.01）。交错纳米薄片的叠加和Pt修饰可以增加活性位点并使其暴露，转移物质和电荷，降低不同中间体的吸附能，从而提高Pt- fe /NF-0.01的HER和OER，在1 M KOH溶液中仅需122和172 mV即可达到100 mA cm - 2。以Pt- fe /NF-0.01为正极和负极的组装电池在1.41和1.56 V的低电压下可达到10和100 mA cm - 2，远低于Pt/C//IrO2:RuO2 （1.54 @10 mA cm - 2和1.77 @100 mA cm - 2）。在100 mA cm−2条件下连续反应48 h后，Pt-Fe/NF-0.01/ Pt-Fe/NF-0.01电池的电势衰减可以忽略不计。本研究为构建廉价高效的OWS器件双功能电催化剂指明了方向。

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引用次数: 0

Exploring the structural stability, hydrogen storage capacity, electronic and optical properties of K2LiXH6 (X = Si, Ge, Sn) hydrides: A first-principles study 探索K2LiXH6 （X = Si, Ge, Sn）氢化物的结构稳定性、储氢能力、电子和光学性质：第一性原理研究

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B

Pub Date : 2026-01-27 DOI: 10.1016/j.mseb.2026.119236

Yuncheng Li, Jian Wang

Light-metal perovskite hydrides have received significant attention as hydrogen storage materials due to their high capacity for storing hydrogen. Using first-principles calculations, we systematically investigated the structural, hydrogen storage, mechanical, electronic, and optical properties of double perovskite hydrides K₂LiXH₆ (X = Si, Ge, Sn). The gravimetric hydrogen storage capacities are 5.04 wt%, 3.68 wt%, and 2.86 wt%, respectively, with K₂LiSnH₆ exhibiting a desorption temperature (344.70 K) close to the U.S. Department of Energy (DOE) 2025 target. All compounds are metallic, brittle, anisotropic, and thermodynamically stable. High ultraviolet absorption coefficients (>10⁴ cm⁻¹) suggest potential light-assisted hydrogen release. This work systematically characterizes the structure-performance relationships of group-IV substituted K₂LiXH₆, offering theoretical guidance for the design of novel hydrogen storage materials.

轻金属钙钛矿氢化物由于具有较高的储氢能力，作为储氢材料受到了广泛的关注。利用第一性原理计算，我们系统地研究了双钙钛矿氢化物K2LiXH6 （X = Si, Ge, Sn）的结构、储氢、机械、电子和光学性质。重量计储氢容量分别为5.04%、3.68和2.86 wt%， K2LiSnH6的解吸温度（344.70 K）接近美国能源部2025年的目标。所有的化合物都是金属的、脆的、各向异性的和热力学稳定的。高紫外线吸收系数（>104 cm−1）表明潜在的光辅助氢释放。本研究系统表征了四族取代K2LiXH6的结构-性能关系，为新型储氢材料的设计提供理论指导。

引用次数: 0

Synthesis of In2O3/α-Bi2O3 heterojunction composites for photocatalytic degradation of tetracycline 光催化降解四环素用In2O3/α-Bi2O3异质结复合材料的合成

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B

Pub Date : 2026-01-24 DOI: 10.1016/j.mseb.2026.119232

Tianyuan Xiao , Xinyue Dong , Nan Yang , Yanming Zhang , Xiaoya Ding , Guangming Yin

To address the increasingly serious problem of antibiotic contamination, the hydrothermal method was employed to synthesize In₂O₃/α-Bi₂O₃ photocatalysts. For tetracycline (TC) in aqueous solution, its photocatalytic degradation efficiency driven by visible light was systematically evaluated. The physical structure, optical properties and charge transfer of the composite materials were characterized and analyzed by XRD, PL and EIS. Nanoparticles In₂O₃ was uniformly loaded on spindle-shaped α-Bi₂O₃, and the specific surface area increased to 17.08 m²/g. The composite material demonstrated a strong TC photodegradation ability, with a degradation efficiency of 86.99% (catalyst dosage = 30 mg, pH = 6, and initial TC concentration = 5 mg·L⁻¹). The experimental results show that its excellent performance is attributed to the formation of heterojunctions, which have improved visible light absorption and efficient charge transfer. Free radical scavenger studies have confirmed that ·O₂⁻ and h⁺ generated by photocatalysts account for the efficient degradation of TC, thus laying a foundation for the practical application of photocatalysts. This study innovatively constructs an In₂O₃/α-Bi₂O₃ heterojunction with tailored loading ratio, which not only extends the visible-light response range but also promotes directional charge transfer, thus achieving superior photocatalytic degradation of tetracycline.

针对日益严重的抗生素污染问题，采用水热法制备了In2O3/α-Bi2O3光催化剂。对四环素在可见光驱动下的光催化降解效果进行了系统评价。利用XRD、PL和EIS对复合材料的物理结构、光学性质和电荷转移进行了表征和分析。纳米颗粒In2O3均匀负载在纺锤形α-Bi2O3上，比表面积增加到17.08 m2/g。在催化剂投加量为30 mg、pH = 6、初始TC浓度为5 mg·L−1的条件下，复合材料具有较强的TC光降解能力，降解效率为86.99%。实验结果表明，其优异的性能是由于异质结的形成，提高了可见光吸收和有效的电荷转移。自由基清除剂研究证实了光催化剂生成的·O₂−和h+是有效降解TC的原因，为光催化剂的实际应用奠定了基础。本研究创新性地构建了定制负载比的In2O3/α-Bi2O3异质结，不仅扩大了可见光响应范围，而且促进了定向电荷转移，从而实现了优越的光催化降解四环素。

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引用次数: 0

Unveiling the potential of BmImTFSI-functionalized poly (acrylic acid)-based ionogel polymer electrolyte for electrical double layer capacitor (EDLC) application 揭示了bmimtfsi功能化聚丙烯酸基离子凝胶聚合物电解质在电双层电容器（EDLC）中的应用潜力

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B

Pub Date : 2026-01-24 DOI: 10.1016/j.mseb.2026.119230

Kar Kien Ong , Yongqi Zhang , Haiyang Liao , H.K. Jun , Chiam-Wen Liew

Ionogel polymer electrolytes (IGPEs) comprising of poly(acrylic acid) (PAA) /lithium bis(trifluoromethanesulfonyl) imide (LiTFSI)/1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide (BmImTFSI) were prepared by solution casting technique. Upon addition of 35 wt% BmImTFSI, PAA-based IGPE exhibits the maximum ionic conductivity of (12.6 ± 0.01) mS/cm at ambient temperature and follows the Arrhenius theory. Incorporation of BmImTFSI into the PAA matrix decreases the glass transition temperature to −7.8 °C, as evidenced by differential scanning calorimetry (DSC) study. XRD showed reduced degree of crystallinity of 47% upon addition of 35 wt% BmImTFSI. Field Emission Scanning Electron Microscopy (FESEM) was performed to study the morphological information of the IGPEs. Upon the incorporation of the ionic liquid into the PAA backbone, there is a slight increase in electrochemical stability window to 3.67 V and an improvement in thermal stability up to 200 °C, as proven by linear sweep voltammetry (LSV) and thermogravimetric analysis (TGA), respectively. FTIR analysis proves the coordination interaction between PAA, LiTFSI and BmImTFSI in the IGPE. An electrical double layer capacitor (EDLC) cell was thus fabricated using the highest conducting IGPE and two identical carbon-based electrodes. The resulting EDLC cell shows better electrochemical performance than that of BmImTFSI-free GPE. Upon the addition of BmImTFSI to the IGPEs, the EDLC shows an increase in specific capacitance to 67 F/g, as illustrated by cyclic voltammetry studies. The results obtained are in good agreement with GCD findings. The fabricated EDLC shows its specific discharge capacitance of 181 F/g, power density of 907 W/kg and energy density of 50 Wh/kg.

采用溶液铸造法制备了聚丙烯酸(PAA) /锂二（三氟甲基磺酰基）亚胺(LiTFSI)/1-丁基-3-甲基咪唑二（三氟甲基磺酰基）亚胺（BmImTFSI）离子凝胶聚合物电解质（igpe）。当添加35 wt%的BmImTFSI时，paa基IGPE在室温下的最大离子电导率为（12.6±0.01）mS/cm，符合Arrhenius理论。差示扫描量热法（DSC）研究表明，将BmImTFSI掺入PAA基体可将玻璃化转变温度降低至- 7.8℃。XRD结果表明，加入35 wt% BmImTFSI后，结晶度降低47%。利用场发射扫描电镜（FESEM）研究了igpe的形态信息。线性扫描伏安法（LSV）和热重分析（TGA）分别证明，离子液体加入PAA骨架后，电化学稳定窗口小幅增加至3.67 V，热稳定性提高至200℃。FTIR分析证实了IGPE中PAA、LiTFSI和BmImTFSI之间的协同相互作用。因此，采用导电率最高的IGPE和两个相同的碳基电极制备了电双层电容器（EDLC）电池。所制备的EDLC电池的电化学性能优于不含bmimtfsi的GPE电池。在igpe中加入BmImTFSI后，EDLC的比电容增加到67 F/g，如循环伏安法研究所示。所得结果与GCD结果吻合较好。制备的EDLC比放电电容为181 F/g，功率密度为907 W/kg，能量密度为50 Wh/kg。

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引用次数: 0

Comprehensive dielectric analysis of Schottky devices with Cu-doped DLC interlayer: Temperature effects and polarization mechanisms 含cu掺杂DLC中间层肖特基器件的综合介电分析：温度效应和极化机制

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B

Pub Date : 2026-01-23 DOI: 10.1016/j.mseb.2026.119238

Ahmet Baran , Erdoğan Özel , Esra Evcin-Baydilli , Ahmet Kaymaz , Şemsettin Altındal

In this study, the temperature-dependent dielectric properties of a Cu-doped diamond-like carbon (DLC) interfacial-layered Schottky device (SD), fabricated by the electrochemical deposition method, were systematically investigated in terms of the dominant polarization mechanisms. Impedance measurements, performed over the temperature range of 80–410 K, were used to calculate the dielectric constant (ε'), dielectric loss (ε″), loss tangent (tan(δ)), ac conductivity (σ_ac), and complex electric modulus (M^⁎), including its real (M′) and imaginary (M″) components. The results reveal that all dielectric parameters exhibit three distinct behaviours within three temperature regions, namely low-temperature (LTs: 80–170 K), moderate-temperature (MTs: 200–290 K), and high-temperature (HTs: 300–410 K) regimes. This behavior indicates a pronounced sensitivity of the DLC interfacial layer to temperature. It was also observed that different polarization mechanisms, including dipolar, trapping-related, electronic, and space-charge polarizations, become dominant depending on the temperature and applied voltage range. Owing to the heterogeneous structure of the SD, the contribution of Maxwell–Wagner polarization, as a specific form of space-charge polarization, becomes particularly significant in the HTs region. Moreover, Cu doping leads to an increase in carrier density within the DLC layer, enhancing the tunneling probability and strengthening space-charge polarization through the increased availability of free carriers.

在本研究中，系统地研究了用电化学沉积方法制备的cu掺杂类金刚石（DLC）界面层肖特基器件（SD）的介电特性随温度的变化规律。在80-410 K温度范围内进行阻抗测量，用于计算介电常数（ε′）、介电损耗（ε″）、损耗正切（tan(δ)）、交流电导率（σac）和复电模量(M)，包括其实（M′）和虚（M″）分量。结果表明，所有介电参数在低温（LTs: 80-170 K）、中温（MTs: 200-290 K）和高温（HTs: 300-410 K）三个温度区域内表现出三种不同的行为。这种行为表明DLC界面层对温度有明显的敏感性。我们还观察到，不同的极化机制，包括偶极极化、陷阱相关极化、电子极化和空间电荷极化，根据温度和施加电压范围而成为主导。由于SD的非均相结构，麦克斯韦-瓦格纳极化作为空间电荷极化的一种特殊形式，在高温超导区域的贡献尤为显著。此外，Cu掺杂导致DLC层内载流子密度增加，通过增加自由载流子的可用性，提高了隧穿概率，增强了空间电荷极化。

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引用次数: 0

Multiferroic properties of 0.7BiFeO3 - (0.3-х)BaTiO3 - хPbTiO3 solid solutions 0.7BiFeO3 - (0.3- m)BaTiO3 - хPbTiO3固溶体的多铁性

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B

Pub Date : 2026-01-23 DOI: 10.1016/j.mseb.2026.119239

Inna V. Lisnevskaya, Ivan G. Sheptun, Olga Yu. Grapenko, Dmitry V. Shaforost, Inga A. Aleksandrova, Anait A. Manukyan, Vsevolod A. Burumov, Anton A. Zabolotnyi, Oleg E. Polozhentsev, Svetlana I. Raevskaya

Solid solutions of 0.7BiFeO₃ – (0.3-х)BaTiO₃ - хPbTiO₃ (x = 0–0.3) were synthesized using the solid-state reaction method. It was shown that in the range of x = 0–0.15, they possess a rhombohedrally distorted perovskite structure. Further, at x = 0.2–0.3, phase separation is observed, i.e., a PbTiO₃-based perovskite phase with an extremely large tetragonal distortion appears; at x = 0.3, the c/a ratio reaches 1.18. For the phase with rhombohedral distortion, the lattice parameters a and α decrease with increasing x, which is consistent with the ionic radii of the Ba²⁺ and Pb²⁺ cations. Throughout the entire x range, the samples exhibit non-zero piezoelectric coefficients d₃₃, as well as typical ferromagnetic behavior. Furthermore, with an increase in lead content, a general deterioration of the piezoelectric and magnetic parameters is observed, which is presumably related to an increase in the ferroelectric hardness of the ceramics and the degree of rhombohedral distortion. This distortion leads to a disruption of the cooperative Fe-O-Fe exchange interactions. The most effective multiferroic properties are demonstrated by the solid solution with x = 0, for which the dielectric constant ε/ε₀ = 135, the dielectric loss tangent tan δ = 0.06, the piezoelectric coefficient d₃₃ = 30 pC/N, the saturation magnetization M_S = 0.86 emu/g, the remanent magnetization M_R = 0.86 emu/g, and the coercive field H_C = 2.1 kOe.

采用固相反应法制备了0.7BiFeO3 - (0.3- m)BaTiO3 - хPbTiO3 （x = 0-0.3）固溶体。结果表明，在x = 0-0.15范围内，它们具有菱形扭曲的钙钛矿结构。此外，在x = 0.2 ~ 0.3时，观察到相分离，即出现具有极大四方畸变的pbtio3基钙钛矿相；当x = 0.3时，c/a比率达到1.18。对于具有菱形畸变的相，晶格参数a和α随x的增加而减小，这与Ba2+和Pb2+阳离子的离子半径一致。在整个x范围内，样品表现出非零压电系数d33，以及典型的铁磁行为。此外，随着铅含量的增加，观察到压电和磁性参数的普遍恶化，这可能与陶瓷的铁电硬度和菱形畸变程度的增加有关。这种扭曲导致Fe-O-Fe交换相互作用的破坏。在x = 0的固溶体中，介电常数ε/ε0 = 135，介电损耗tan δ = 0.06，压电系数d33 = 30 pC/N，饱和磁化MS = 0.86 emu/g，剩余磁化MR = 0.86 emu/g，矫顽力场HC = 2.1 kOe，具有最有效的多铁性。

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