Materials Science and Engineering: B最新文献

Synthesis and electrochemical evaluation of WS2/WO3-x heterostructure for binder-free high-performance supercapacitors 无粘结剂高性能超级电容器WS2/WO3-x异质结构的合成及电化学评价

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

Materials Science and Engineering: B

Pub Date : 2026-05-01 Epub Date: 2026-02-06 DOI: 10.1016/j.mseb.2026.119256

Nishtha Sagta, P.V. Sada, Ajay Kumar Mishra

Transition metal-based electrodes are the forefront of advanced supercapacitor research due to their tunable redox activity and structural versatility. In this work, a binary composite tungsten disulfide/tungsten oxide (WS₂/WO_3-x) material was synthesized via an atmospheric pressure chemical vapor deposition (APCVD) technique and its application as a binder-free electrode for high-performance supercapacitors is studied. The as-synthesized WS₂/WO_3-x binary composite possesses a hierarchical flower-rod like morphology, resulting in combined electric double-layer and pseudocapacitive capacitance. A symmetric supercapacitor is assembled by coating WS₂/WO_3-x on a carbon cloth. The symmetric supercapacitor delivers an excellent specific capacitance of 380.8 F/g at 0.083 A/g with an energy density of 33.8 Wh/kg and power density of 133.3 W/kg. The electrode retains 84% of its initial capacitance after 2100 cycles at a current density of 2.6 A/g, underscoring its excellent cycling stability. Thus, these observed excellent electrochemical performances establish the WS₂/WO_3-x binary composite based electrodes, suggesting their tremendous potential as supercapacitor electrodes for energy storage systems.

过渡金属基电极由于其可调节的氧化还原活性和结构的多功能性而成为先进超级电容器研究的前沿。本文采用常压化学气相沉积（APCVD）技术合成了二硫化钨/氧化钨二元复合材料（WS2/WO3-x），并研究了其作为高性能超级电容器无粘结剂电极的应用。合成的WS2/WO3-x二元复合材料具有层叠的花棒状形貌，形成复合电双层和伪电容电容。通过在碳布上涂覆WS2/WO3-x来组装对称超级电容器。该对称超级电容器在0.083 A/g时具有380.8 F/g的比电容，能量密度为33.8 Wh/kg，功率密度为133.3 W/kg。在2.6 a /g的电流密度下，经过2100次循环后，电极保持了84%的初始电容，强调了其出色的循环稳定性。因此，这些观察到的优异电化学性能为WS2/WO3-x二元复合电极奠定了基础，表明其作为储能系统超级电容器电极的巨大潜力。

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引用次数: 0

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 : 2026-05-01 Epub 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 : 2026-05-01 Epub 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

Urea-assisted hydrothermal synthesis of Co3O4/SnO2 composites as a battery-type material for hybrid supercapacitors 尿素辅助水热合成Co3O4/SnO2复合材料作为混合超级电容器电池型材料

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

Materials Science and Engineering: B

Pub Date : 2026-05-01 Epub Date: 2026-02-12 DOI: 10.1016/j.mseb.2026.119269

Yu Zhao , P.C. Nagajyothi , Ballipalli Chandra Babu , Sarah A. Alshehri , Jaesool Shim , Prasad Kumcham

Metal oxide composites exhibiting battery-like behavior have attracted increasing attention for application in hybrid supercapacitors (HSCs). The combination of two distinct metal oxides enhances electrochemical activity compared to either oxide alone. In this study, Co₃O₄/SnO₂ composites were synthesized via a hydrothermal method using varying amounts of urea as a structure-directing agent. Four samples, designated CoSn-1, CoSn-2, CoSn-3, and CoSn-4, were prepared with 1, 2, 4, and 8 mmol of urea, respectively. The influence of urea concentration on the structural, morphological, and surface properties of the composites was systematically investigated. Among these, CoSn-3 exhibited a uniform rod-like morphology with small nanoparticles, resulting in an optimal balance of surface area and pore structure. All CoSn electrodes demonstrated battery-type characteristics; however, CoSn-3 achieved the highest specific capacity of 524.00C g⁻¹ at 0.5 A g⁻¹ and retained 93% of its initial capacity after 5000 cycles at 5 A g⁻¹, indicating excellent capacity retention and long-term stability. These findings suggest that tuning the urea content during synthesis can significantly enhance the electrochemical performance of battery-type metal oxide composites in HSCs.

具有电池样性能的金属氧化物复合材料在混合超级电容器（hsc）中的应用越来越受到关注。两种不同金属氧化物的结合比单独使用任何一种氧化物都能增强电化学活性。以不同量的尿素为结构导向剂，采用水热法制备了Co₃O₄/SnO₂复合材料。分别以1、2、4、8 mmol尿素制备4个样品，分别命名为CoSn-1、CoSn-2、CoSn-3和CoSn-4。系统地研究了尿素浓度对复合材料结构、形态和表面性能的影响。其中，CoSn-3表现出均匀的棒状小颗粒形态，使表面积和孔隙结构达到最佳平衡。所有CoSn电极均具有电池型特性；然而，CoSn-3在0.5 A g−1条件下的比容量达到了最高的524.00C g−1，在5 A g−1条件下循环5000次后仍保持了93%的初始容量，表明了良好的容量保留和长期稳定性。这些结果表明，在合成过程中调整尿素含量可以显著提高电池型金属氧化物复合材料在hsc中的电化学性能。

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引用次数: 0

Er3+-activated BaLa2WO7 multifunctional green phosphors for optical temperature sensing, fingerprint visualization and WLEDs Er3+激活BaLa2WO7多功能绿色荧光粉，用于光学温度传感，指纹可视化和wled

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

Materials Science and Engineering: B

Pub Date : 2026-05-01 Epub Date: 2026-02-12 DOI: 10.1016/j.mseb.2026.119254

Weihai Chen , Ruirui Cui , Xingyang Peng , Chonghui Qi , Zhanghai Tian , Chaoyong Deng

In this study, a series of Er³⁺-doped BaLa₂WO₇ phosphor materials have been successfully synthesized by high-temperature solid-phase reaction method. By structural and morphological characterization, it was confirmed that Er³⁺ was effectively doped into the BaLa₂WO₇ matrix lattice. Under excitation from light sources at wavelengths of 379 and 980 nm, the BaLa₂WO₇:Er³⁺ fluorescent powder exhibits green luminescence centered at 528 and 547 nm. Benefiting from the splitting of luminescence center peaks and based on the fluorescence intensity ratio (FIR) technique, this study innovatively proposes a multi-peak, multi-concentration comparison method to achieve dual-mode temperature sensing, thereby improving the sensitivity performance of temperature measurements. The maximum relative sensitivity and absolute sensitivity of the down-converted luminescence were 1.381% K⁻¹ (473 K) and 1.474% K⁻¹ (298 K), respectively, over the temperature range of 298–473 K, while the maximum relative sensitivity and absolute sensitivity of the up-converted luminescence were 1.27% K⁻¹ (473 K) and 0.97% K⁻¹ (298 K), respectively. Under 379 nm UV excitation, the optimal doping concentration of Er³⁺ was determined to be 3%, and a white LED device with high color rendering index (R_a = 81.2) and low color temperature (5161 K) was successfully prepared based on the BaLa₂WO₇:3%Er³⁺ phosphor. In addition, the phosphor demonstrated excellent performance in fingerprint visualization applications, enabling high-contrast imaging of tertiary fingerprint features. The results indicate that the Er³⁺-doped BaLa₂WO₇ fluorescent material not only possesses excellent optical temperature sensing capability, but also has a promising application in the fields of white light LED illumination and fingerprint visualization.

本研究采用高温固相法成功合成了一系列Er3+掺杂BaLa2WO7荧光粉材料。通过结构和形态表征，证实Er3+被有效地掺杂到BaLa2WO7基体晶格中。在379和980 nm光源激发下，BaLa2WO7:Er3+荧光粉在528和547 nm处发出绿色荧光。本研究利用发光中心峰的分裂特性，在荧光强度比（FIR）技术的基础上，创新性地提出了一种多峰、多浓度比较方法，实现双模温度传感，从而提高温度测量的灵敏度性能。在298 ~ 473 K温度范围内，下转换发光的最大相对灵敏度和绝对灵敏度分别为1.381% K−1 （473 K）和1.474% K−1 (298 K)，而上转换发光的最大相对灵敏度和绝对灵敏度分别为1.27% K−1 （473 K）和0.97% K−1 （298 K）。在379 nm紫外光激发下，确定了Er3+的最佳掺杂浓度为3%，成功制备出了高显色指数（Ra = 81.2）、低色温（5161 K）的白光LED器件。此外，该荧光体在指纹可视化应用中表现出优异的性能，实现了三级指纹特征的高对比度成像。结果表明，Er3+掺杂BaLa2WO7荧光材料不仅具有优异的光学温度传感能力，而且在白光LED照明和指纹显示领域具有广阔的应用前景。

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引用次数: 0

Magnetic photocatalysts based on ferrite@ZrO2@TiO2 core-shell systems for degradation of aqueous pollutants 基于ferrite@ZrO2@TiO2核壳体系的磁性光催化剂降解含水污染物

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

Materials Science and Engineering: B

Pub Date : 2026-05-01 Epub Date: 2026-01-29 DOI: 10.1016/j.mseb.2026.119241

Alex M. Neris , Charlie Salvador , Ubiratan C. Silva , Carlos Chesman , Giovanna Machado , Elson Longo , Ieda M.G. Santos

The versatility of core@shell systems comes from the combination of multiple properties, considering the specificity of each materials. In the present work, photocatalysts easily separated from the aqueous media were obtained, by the use of core@shell systems, CoMnFe₂O₄@ZrO₂@TiO₂, with different proportions of ZrO₂ and TiO₂. The materials were synthesized by the modified Pechini method and characterized in relation to its structural, physical and morphological properties. The photocatalytic efficiency was evaluated using a cationic as target. All photocatalysts were easily separated from the aqueous solution using a magnet, despite the small amount of ferrite (10%, in wt) in the core@shell systems. A high efficiency (96%) was obtained in the decolorization of methylene blue using the system CoMnFe₂O₄@ZrO₂@TiO₂, with 85% of TiO₂ and 5% of ZrO₂, after 16 h of UVC irradiation with 3 low power lamps (9 W). This decolorization is much higher than results obtained without ZrO₂ as intermediate phase in CoMnFe₂O₄@TiO₂ photocatalyst (49%) and without TiO₂ as active phase in CoMnFe₂O₄@ZrO₂ (40%), for the same irradiation time.

core@shell系统的多功能性来自多种特性的组合，考虑到每种材料的特殊性。在本工作中，通过使用core@shell体系，CoMnFe2O4@ZrO2@TiO2，不同比例的ZrO2和TiO2，获得了易于从水介质中分离的光催化剂。采用改进的Pechini方法合成了该材料，并对其结构、物理和形态性能进行了表征。以阳离子为目标评价了光催化效率。所有的光催化剂都很容易用磁铁从水溶液中分离出来，尽管在core@shell体系中有少量的铁氧体（10%,wt）。3盏低功率灯（9 W） UVC照射16 h后，TiO2含量为85%，ZrO2含量为5%的CoMnFe2O4@ZrO2@TiO2体系对亚甲基蓝的脱色效率达到96%。在相同的辐照时间下，这种脱色效果远高于在CoMnFe2O4@TiO2光催化剂中不使用ZrO2作为中间相（49%）和在CoMnFe2O4@ZrO2中不使用TiO2作为活性相（40%）的脱色效果。

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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 : 2026-05-01 Epub 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

Synergistic effect of CoFe2O4 and Ag nanoparticles on TiO2 Photoanodes for high-efficiency dye-sensitized solar cells with and without external magnetic field CoFe2O4和Ag纳米粒子在有外加磁场和无外加磁场情况下染料敏化太阳能电池TiO2光阳极上的协同效应

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

Materials Science and Engineering: B

Pub Date : 2026-05-01 Epub Date: 2026-02-05 DOI: 10.1016/j.mseb.2026.119264

Leila Taghavi ranjbar , Seyed Mohammad Mirkazemi , Amir Masoud AArabi

In this work, dye-sensitized solar cells (DSSCs) were fabricated using TiO₂ photoanodes modified with ferromagnetic CoFe₂O₄ and plasmonic Ag nanoparticles and evaluated under standard conditions and an external magnetic field (B = 25 mT). Different weight percentages of CoFe₂O₄ and Ag were incorporated into the TiO₂ matrix to optimize photovoltaic efficiency. Structural and morphological characterization (XRD, FESEM/BSE, and EDS) confirmed successful incorporation and distribution of the additives. Tauc analysis showed a pronounced optical-edge shift from 3.20 eV (TiO₂) to 2.80 eV for TiO₂/6 wt% CoFe₂O₄/0.6 wt% Ag, dominated by CoFe₂O₄incorporation (Ag contributes mainly via plasmonic/interfacial effects). The TiO₂/6 wt% CoFe₂O₄/0.6 wt% Ag composite photoanode achieved a power conversion efficiency (PCE) of 6.23% under standard conditions, a 97% improvement over the 3.16% PCE of pure TiO₂. Under the magnetic field, the TiO₂/6 wt% CoFe₂O₄ photoanode exhibited the highest PCE of 7.3%, whereas the three-component TiO₂/6 wt% CoFe₂O₄/0.6 wt% Ag photoanode displayed only a slight improvement to 6.51% compared to its field-free condition. In contrast, Ag-only modification exhibited a performance decrease under the magnetic field (3.99% to 3.46% for 0.6 wt% Ag). These findings highlight the effectiveness of CoFe₂O₄ and Ag-modified TiO₂ photoanodes in improving DSSC performance, particularly with passive magnetic field assistance, demonstrating significant potential for advancing solar energy conversion technologies through tailored nanocomposite photoanodes.

在这项工作中，用铁磁CoFe2O4和等离子体Ag纳米粒子修饰的TiO2光阳极制备了染料敏化太阳能电池（DSSCs），并在标准条件和外磁场（B = 25 mT）下进行了评价。在TiO2基质中加入不同重量百分比的CoFe2O4和Ag以优化光伏效率。结构和形态表征（XRD， FESEM/BSE和EDS）证实了添加剂的成功掺入和分布。tac分析显示，TiO2/6 wt% CoFe2O4/0.6 wt% Ag的光边明显从3.20 eV （TiO2）到2.80 eV，主要是cofe2o4的掺入（Ag主要通过等离子体/界面效应起作用）。在标准条件下，TiO2/6 wt% CoFe2O4/0.6 wt% Ag复合光阳极的功率转换效率（PCE）为6.23%，比纯TiO2的3.16% PCE提高了97%。在磁场条件下，TiO2/6 wt% CoFe2O4光阳极的PCE最高，为7.3%，而三组分TiO2/6 wt% CoFe2O4/0.6 wt% Ag光阳极的PCE仅为6.51%。相比之下，纯银改性在磁场下表现出性能下降（0.6 wt% Ag时，性能下降3.99%至3.46%）。这些发现强调了CoFe2O4和ag修饰的TiO2光阳极在改善DSSC性能方面的有效性，特别是在被动磁场辅助下，展示了通过定制纳米复合光阳极推进太阳能转换技术的巨大潜力。

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引用次数: 0

Design and optimization of ZnO/MnO2 nanocomposites for enhanced energy storage in supercapacitor applications 用于超级电容器增强储能的ZnO/MnO2纳米复合材料的设计与优化

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

Materials Science and Engineering: B

Pub Date : 2026-05-01 Epub Date: 2026-02-10 DOI: 10.1016/j.mseb.2026.119281

Hira Arif , Hassan Akbar , Ayesha Bibi , Zeynep Ciğeroğlu , S.A. Abd El-Azeem , Jeong Ryeol Choi , Asghar Ali

Developing high-performance electrode materials remains a major challenge for advancing supercapacitor technology, primarily due to the limited electrical conductivity and cycling instability of conventional transition-metal oxides. In this work, ZnO/MnO₂ nanocomposites were synthesized via a hydrothermal route to exploit the complementary properties of MnO₂'s pseudocapacitive redox activity and ZnO's structural stability and electron transport capability. Structural and morphological analyses by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy-dispersive X-ray spectroscopy (EDX) confirmed the successful formation of a ZnO/MnO₂ composite with strong interfacial coupling. Cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS) in a three-electrode configuration were used to determine the electrochemical performance. Electrochemical characterization demonstrated significantly enhanced capacitance and charge-storage kinetics, achieving 1152 F g⁻¹ at 0.8 A g⁻¹ (GCD) and 685 F g⁻¹ at 5 mV/s (CV). The composite further delivered an energy density of 31.4 Wh kg⁻¹ and a power density of 712 W kg⁻¹, supported by reduced charge-transfer resistance in EIS. These results confirm a well-balanced capacitive and diffusion-controlled contribution in the combined composites, indicating synergistic charge-transfer kinetics and further clarifying the charge-storage process, as described by Dunn's model. The findings underscore ZnO/MnO₂ nanocomposites as promising electrode materials capable of delivering high energy-storage efficiency and improved cycling behavior, providing a viable pathway toward advanced next-generation supercapacitors.

开发高性能电极材料仍然是推进超级电容器技术的主要挑战，主要是由于传统过渡金属氧化物的导电性有限和循环不稳定性。本文通过水热法合成ZnO/MnO2纳米复合材料，利用MnO2的赝容性氧化还原活性与ZnO的结构稳定性和电子传递能力的互补特性。通过x射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和能量色散x射线能谱（EDX）对ZnO/ mno2复合材料进行了结构和形态分析，证实了ZnO/ mno2复合材料的成功形成。采用循环伏安法（CV）、恒流充放电法（GCD）和电化学阻抗谱法（EIS）测定了三电极结构下的电化学性能。电化学表征表明，电容和电荷存储动力学显著增强，在0.8 A g−1 （GCD）下达到1152 F g−1，在5 mV/s （CV）下达到685 F g−1。该复合材料进一步提供了31.4 Wh kg - 1的能量密度和712 W kg - 1的功率密度，并降低了EIS中的电荷转移电阻。这些结果证实了复合材料中电容性和扩散控制的良好平衡，表明了协同电荷转移动力学，并进一步阐明了Dunn模型所描述的电荷存储过程。这些发现强调了ZnO/MnO2纳米复合材料是一种有前途的电极材料，能够提供高能量存储效率和改善循环行为，为先进的下一代超级电容器提供了可行的途径。

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引用次数: 0

Low-temperature synthesis of Bi5O7I-Bi4O5I2 solid solution/residual carbon composites with oxygen vacancies for efficient visible-light photocatalysis 低温合成具有氧空位的Bi5O7I-Bi4O5I2固溶体/残碳复合材料的高效可见光催化

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

Materials Science and Engineering: B

Pub Date : 2026-05-01 Epub Date: 2026-02-05 DOI: 10.1016/j.mseb.2026.119275

Huiwei Ding , Minghui Wei , Wenpei Peng , Chaoyun Yan , Keiko Sasaki , Qiaofeng Han

In this study, using bismuth citrate instead of bismuth nitrate significantly reduced the calcination temperature required for synthesizing Bi₅O₇I-Bi₄O₅I₂ solid solution. Furthermore, oxygen vacancies (OVs) and residual carbon from the incomplete decomposition of citrate groups were successfully introduced into the resulting composite. The existence of OVs and carbon could promote the carrier separation and thus enhance the photocatalytic activity. Hence, the resulting square sheet-like Bi₅O₇I-Bi₄O₅I₂ solid solution/carbon (denoted as O-mBBI/C) composites exhibited superior photocatalytic activity for the degradation of 20 mg·L⁻¹ of tetracycline (TC) and methylene blue (MB) under irradiation of visible light, with apparent rate constants of 0.04809 min⁻¹ and 0.02530 min⁻¹, respectively, which were higher than those of pure BiOI (0.00354 min⁻¹, 0.00234 min⁻¹) and Bi₅O₇I/C (0.00539 min⁻¹, 0.00429 min⁻¹). Furthermore, O-mBBI/C showed superior photodegradation activity for other pollutants, such as 20 mg·L⁻¹ bisphenol A (BPA), 10 mg·L⁻¹ rhodamine B (RhB), 20 mg·L⁻¹ methyl violet (MV), etc.

在本研究中，用柠檬酸铋代替硝酸铋显著降低了合成Bi5O7I-Bi4O5I2固溶体所需的煅烧温度。此外，还成功地将氧空位（OVs）和柠檬酸基不完全分解产生的残碳引入到复合材料中。OVs和碳的存在可以促进载体的分离，从而提高光催化活性。因此，得到的方形片状Bi5O7I- bi4o5i2固溶体/碳（O-mBBI/C）复合材料在可见光照射下对20 mg·L−1的四环素（TC）和亚甲基蓝（MB）表现出良好的光催化活性，其表观速率常数分别为0.04809 min−1和0.02530 min−1，高于纯Bi5O7I （0.00354 min−1,0.00234 min−1）和Bi5O7I/C （0.00539 min−1,0.00429 min−1）。此外，O-mBBI/C对20 mg·L−1双酚A （BPA）、10 mg·L−1罗丹明B （RhB）、20 mg·L−1甲基紫（MV）等污染物均具有良好的光降解活性。

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引用次数: 0