Ceramics International最新文献

Polyetherimide copolymer film with room-temperature self-healing properties and high breakdown field strength 具有室温自修复特性和高击穿场强的聚醚酰亚胺共聚物薄膜

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2024-10-23 DOI: 10.1016/j.ceramint.2024.10.252

Zeyu Ning, Zhuo Wang, Ting Zhao, Ronghui Ye, Jinteng Kang, Zhuang Liu, JiaoJiao Wang

With the waste of resources caused by human activities, it has gradually become an increasingly prominent social problem. The development of self-healing polymers in the field of insulation has attracted widespread attention. Develop polymer matrices with efficient healing efficiency and sound insulation properties to achieve green and sustainable resource conservation. In addition, improving the dielectric properties of intrinsic self-healing matrices has been a hot topic. In this work, we developed a new PEI matrix-modified self-healing polymer substrate that provides a breakdown field strength of 240 kV/mm and self-healing properties at room temperature, this has significantly improved the dielectric properties over other previously reported self-healing polymers. In addition to the abovementioned performance, we found significant differences in thermodynamic behavior in the synthesized end-modified polymers. By dielectric characterization (LCR), the breakdown composite can be left at room temperature for 60 min, and the material can recover 80 % of the initial properties without external intervention(This is demonstrated by the fact that its DC conductivity at 60 min of autonomous healing was significantly changed from that of the freshly electrically pierced DC conductivity and remained around 5.38 × 10⁻¹¹ S/cm for a longer period of time thereafter). The microscopic morphology of the modified PEI matrix was observed by scanning electron microscopy (SEM) and EDS surface elemental analysis, which further supports the existence of metal coordination structures. These findings can further deepen the thinking of self-healing dielectric composites. The work inspired by this may break the limits and take self-healing composite dielectric materials to a new height.

随着人类活动造成的资源浪费，已逐渐成为一个日益突出的社会问题。自愈合聚合物在隔音领域的发展引起了广泛关注。开发具有高效愈合效率和隔音性能的聚合物基体，实现绿色可持续的资源节约。此外，改善本征自愈合基质的介电性能也一直是热门话题。在这项工作中，我们开发了一种新的 PEI 基体改性自愈合聚合物基底，其击穿场强可达 240 kV/mm，并具有室温下自愈合的特性，与之前报道的其他自愈合聚合物相比，显著提高了介电性能。除了上述性能外，我们还发现合成的末端改性聚合物在热力学行为上存在显著差异。通过介电特性分析（LCR），击穿的复合材料可在室温下放置 60 分钟，且无需外部干预即可恢复 80% 的初始特性（这表现在其在自主愈合 60 分钟后的直流电导率与刚电穿孔时的直流电导率相比发生了显著变化，并在此后较长时间内保持在 5.38 × 10-11 S/cm 左右）。通过扫描电子显微镜（SEM）和 EDS 表面元素分析观察了改性 PEI 基体的微观形貌，进一步证实了金属配位结构的存在。这些发现可以进一步深化对自修复介电复合材料的思考。受此启发的研究工作可能会打破极限，将自愈合复合介电材料推向一个新的高度。

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引用次数: 0

High-efficiency 1.6 μm-band fiber laser based on single Er3+-doped tungsten tellurite glass with high mechanical strength through tailored glass network 基于单掺 Er3+ 的碲钨玻璃的高效 1.6 μm 波段光纤激光器，通过定制玻璃网络实现高机械强度

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2024-10-18 DOI: 10.1016/j.ceramint.2024.09.225

Lulu Xu , Yuzhou Pan , Guanghui Wang , Fajian He , Shixun Dai

In this study, the correlation between the Raman structure, thermal stability, and mechanical properties of TeO₂-ZnO-La₂O₃–WO₃ glasses with varying WO₃ contents are systematically established. By exploring the critical point in the transformation process of glass network structural units, the optimal glass components of 74TeO₂-12ZnO-5La₂O₃–9WO₃ glass possess the maximum thermal stability (158 °C) and the highest mechanical properties at the same time. The maximum Vicker hardness and Young's modulus of the optimal glass can reach up to 4.007 GPa and 56.212 GPa, which are higher than those of the well-known TeO₂-ZnO-Na₂O (TZN) and TeO₂-ZnO-La₂O₃ (TZL) glasses. Furthermore, the 0.5 mol% Er³⁺-doped glass at this critical point (TZLW-0.5Er) exhibits a higher laser figure of merit (54.29 × 10⁻²¹ cm² ms), a larger laser gain bandwidth value (116 nm) and higher emission cross-sections at 1600 nm (2.52 × 10⁻²¹ cm²) and 1625 nm (1.06 × 10⁻²¹ cm²) than other host glasses. Finally, high-efficiency laser outputs at 1600 and 1625 nm based on TZLW-0.5Er glass fiber are successfully achieved by simulation. These results show the greater practical potential of TZLW-0.5Er glass with higher mechanical strength compared to TZN and TZL fibers for the 1.6 μm-band laser.

本研究系统地建立了不同 WO3 含量的 TeO2-ZnO-La2O3-WO3 玻璃的拉曼结构、热稳定性和力学性能之间的相关性。通过探究玻璃网络结构单元转化过程中的临界点，74TeO2-12ZnO-5La2O3-9WO3 玻璃的最佳玻璃组分具有最大的热稳定性（158 °C），同时具有最高的力学性能。最佳玻璃的最大维氏硬度和杨氏模量分别高达 4.007 GPa 和 56.212 GPa，高于著名的 TeO2-ZnO-Na2O (TZN) 和 TeO2-ZnO-La2O3 (TZL) 玻璃。此外，与其他主玻璃相比，在该临界点掺杂 0.5 mol% Er3+ 的玻璃（TZLW-0.5Er）表现出更高的激光优度（54.29 × 10-21 cm2 ms）、更大的激光增益带宽值（116 nm）以及在 1600 nm（2.52 × 10-21 cm2）和 1625 nm（1.06 × 10-21 cm2）处更高的发射截面。最后，通过模拟成功实现了基于 TZLW-0.5Er 玻璃光纤的 1600 和 1625 nm 高效激光输出。这些结果表明，与 TZN 和 TZL 光纤相比，机械强度更高的 TZLW-0.5Er 玻璃在 1.6 μm 波段激光方面具有更大的实用潜力。

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引用次数: 0

Effect of epoxy resin addition on the acoustic impedance, microstructure, dielectric and piezoelectric properties of 1–3 connectivity lead-free barium zirconate titanate ceramic cement-based composites 添加环氧树脂对 1-3 连通性无铅锆钛酸钡陶瓷水泥基复合材料的声阻抗、微结构、介电和压电特性的影响

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2024-10-18 DOI: 10.1016/j.ceramint.2024.10.251

Thanyapon Wittinanon , Rattiyakorn Rianyoi , Ruamporn Potong , Arnon Chaipanich

In this work, 1–3 connectivity barium zirconate titanate ceramic cement-based composites were fabricated using Portland cement and epoxy resin as the matrix. Barium zirconate titanate (BZT) of 40–60 % by volume was used while epoxy was used with cement at 0–7% by volume. Dielectric and piezoelectric properties, and other properties such as acoustic impedance, density and microstructure were investigated. It was found that epoxy resin can be used in combination with BZT to achieve a suitable acoustic impedance value (9–11 × 10⁶ kg/m·s²) matching that of concrete for structural health monitoring application. Thus, when epoxy resin was used at 7 %, BZT volume can be increased to 60 % where the highest d₃₃ value of 93 pC/N was found and remain within the acoustic matching range. In addition, when epoxy resin was increased, both piezoelectric charge coefficient (d₃₃) and piezoelectric voltage coefficient (g₃₃) were also found to increase. This is likely due to the lower porosity thus denser matrix when epoxy resin was used in addition to cement.

在这项工作中，使用波特兰水泥和环氧树脂作为基体，制作了 1-3 连通性锆钛酸钡陶瓷水泥基复合材料。锆钛酸钡（BZT）的使用比例为 40-60%（体积比），环氧树脂与水泥的使用比例为 0-7%（体积比）。研究了介电性能、压电性能以及声阻抗、密度和微观结构等其他性能。研究发现，环氧树脂与 BZT 结合使用可获得与混凝土相匹配的合适声阻抗值（9-11 × 106 kg/m-s2），用于结构健康监测。因此，当环氧树脂的用量为 7% 时，BZT 的用量可增加到 60%，此时的最高 d33 值为 93 pC/N，且仍在声学匹配范围内。此外，当环氧树脂用量增加时，压电电荷系数（d33）和压电电压系数（g33）也会增加。这可能是由于在水泥中添加环氧树脂后，孔隙率降低，基体更加致密。

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引用次数: 0

Improvement of energy storage properties of BNT-based ceramics via compositional modification 通过成分改性提高 BNT 基陶瓷的储能性能

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2024-10-04 DOI: 10.1016/j.ceramint.2024.09.361

Yangxi Yan , Jiejie Hui , Xiaoying Wang , Dongyan Zhang , Maolin Zhang , Mo Zhao , Meng Wan , Li Jin , Zhimin Li

Lead-free ceramic capacitors are extensively utilized in pulsed power systems for their environmentally friendly characteristics, high power density, and fast charging/discharging rate. However, it remains highly challenging to achieve concurrent improvements in both recoverable energy storage density (W_rec) and efficiency (η). In this study, Ta₂O₅ with a wide bandgap (∼4 eV) was chosen in complex with Mg²⁺ ions to form Ba(Mg_1/3Ta_2/3)O₃ as the second phase of a BNT-based solid solution. Combined with phase modulation, a compositional disorder of equipotential sites is formed in chalcogenide crystals, which in turn induces charge disorder generating localized random fields. We have designed and prepared a set of binary (1-x)Bi_0.5Na_0.5TiO₃-xBa(Mg_1/3Ta_2/3)O₃ (BNT-xBMT) ceramics using a conventional solid-phase method. An ultra-high breakdown field strength (E_b) value (245 kV/cm) was attained in 0.80BNT-0.20BMT ceramic, resulting in desirable values of W_rec (3.99 J/cm³) and η (92.0 %). These results offer a new strategy for designing high entropy ceramic materials of high performance in the future.

无铅陶瓷电容器因其环保特性、高功率密度和快速充放电速率而被广泛应用于脉冲功率系统中。然而，要同时提高可回收能量存储密度（Wrec）和效率（η），仍然具有很大的挑战性。本研究选择了具有宽带隙（∼4 eV）的 Ta2O5 与 Mg2+ 离子复合形成 Ba(Mg1/3Ta2/3)O3 作为基于 BNT 的固溶体的第二相。结合相位调制，在钙化晶体中形成了等势点的成分紊乱，进而诱发电荷紊乱，产生局部随机场。我们采用传统固相法设计并制备了一组二元 (1-x)Bi0.5Na0.5TiO3-xBa(Mg1/3Ta2/3)O3 (BNT-xBMT) 陶瓷。0.80BNT-0.20BMT 陶瓷达到了超高击穿场强 (Eb) 值（245 kV/cm），从而获得了理想的 Wrec 值（3.99 J/cm3）和 η 值（92.0 %）。这些结果为今后设计高性能的高熵陶瓷材料提供了一种新策略。

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引用次数: 0

Effects of mechanical alloying methods on structural phase stability, chemical state, optical, electrical and ferroelectric properties in Sc-doped α-Fe2O3 system 机械合金化方法对掺杂 Sc 的 α-Fe2O3 体系的结构相稳定性、化学态、光学、电学和铁电性能的影响

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2024-09-29 DOI: 10.1016/j.ceramint.2024.09.317

Bipin Kumar Parida , R.N. Bhowmik , Amit Kumar

The development of metal doped α-Fe₂O₃ (hematite) based wide band gap semiconductors with high electrical conductivity, high electrical polarization and wide optical band gap is a challenging problem and also useful for application point of view. In this work, a substantial enhancement of electrical conductivity, optical band gap and ferroelectric polarization have been recorded at room temperature for Sc doped α-Fe₂O₃ system. Two different methods of the mechanical alloying and subsequent heat treatment have been used to synthesize the samples of α-Fe_2-xSc_xO₃ oxide (x = 0.2–1.0). The X-ray diffraction patterns have confirmed formation of single-phased Rhombohedral structure for low Sc doping content (x = 0.2), whereas a mixture of Rhombohedral-structured α-Fe₂O₃ type phase and cubic-structured Sc₂O₃ type phase has been formed for the higher Sc contents (x = 0.5 and 1.0). The phase fractions varied depending on the amount of Sc content, chemical reaction during mechanical alloying of the elementary oxides and solid-state reaction during the heat treatment. Response of the Sc₂O₃ type phase in Raman spectra is sensitive depending on the methods of inter-mixing the α-Fe₂O₃ and Sc₂O₃ by mechanical alloying. X-ray photoelectron spectroscopy (XPS) confirmed the metal (Fe, Sc) ions in +3 charge state, although the samples for low Sc content x = 0.2 showed a signature of Fe⁺² and Sc⁺⁴ states. A detailed analysis of the Fe 3s XPS band confirmed a strong 3s-3d spins exchange coupling of strengths 1.18 eV–1.34 eV.

开发基于掺杂金属的α-Fe2O3（赤铁矿）宽带隙半导体具有高电导率、高电极化和宽光带隙是一个具有挑战性的问题，同时也是一个有用的应用观点。在这项研究中，掺杂 Sc 的 α-Fe2O3 体系在室温下的电导率、光带隙和铁电极化都有大幅提高。在合成 α-Fe2-xScxO3 氧化物（x = 0.2-1.0）样品时，采用了两种不同的机械合金化和后续热处理方法。X 射线衍射图样证实，在 Sc 掺杂含量较低时（x = 0.2），形成了单相的斜方体结构，而在 Sc 含量较高时（x = 0.5 和 1.0），则形成了斜方体结构的 α-Fe2O3 型相和立方体结构的 Sc2O3 型相的混合物。相分数的变化取决于 Sc 含量、基本氧化物机械合金化过程中的化学反应以及热处理过程中的固态反应。拉曼光谱中 Sc2O3 类型相的反应灵敏度取决于通过机械合金化将 α-Fe2O3 和 Sc2O3 互相混合的方法。X 射线光电子能谱 (XPS) 证实金属（Fe、Sc）离子处于 +3 电荷状态，尽管 Sc 含量 x = 0.2 低的样品显示出 Fe+2 和 Sc+4 状态。对 Fe 3s XPS 波段的详细分析证实，3s-3d 自旋交换耦合强度为 1.18 eV-1.34 eV。

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引用次数: 0

Antimicrobial studies of visible light-responsive nanoflower spheres Bi2WO6/ZnO 可见光响应纳米花球 Bi2WO6/ZnO 的抗菌研究

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2024-09-28 DOI: 10.1016/j.ceramint.2024.09.207

Luyin Zhao , Jingmei Li , Jiayun Shao , Ling Zhang , Yuhao Ji , Xiulong Li , Dianmin Ju

The contamination of water resources in recent years has resulted in the dissemination of harmful bacteria via water sources, posing a significant threat to the safety and well-being of humans, animals, and plants. Consequently, there is a growing concern over the health and sanitation of water resources. Photocatalysis, a novel and very effective antibacterial method, has gained significant attention in the area of antibacterial research. Bismuth nitrate pentahydrate and sodium tungstate dihydrate were used in a straightforward hydrothermal process to create nanoflower spheres Bi₂WO₆/ZnO photocatalytic composites in molar ratios of 1:1, 1:2, 1:3, and 1:4. The first-ever demonstration of the photocatalytic broad-spectrum antibacterial activity of porous nanoflower spheres Bi₂WO₆/ZnO composites was shown. The samples were analyzed using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FT-IR), and ultraviolet–visible spectroscopy (UV–vis). The antibacterial activity was evaluated using the dilution coated plate technique, with LED light irradiation. The findings indicate that the Bi₂WO₆/ZnO composite has a much superior antibacterial activity against both bacteria and fungus compared to individual Bi₂WO₆ and ZnO. When exposed to LED lighting with an intensity of 35 W, the Bi₂WO₆/ZnO nanoparticles in a 1:2 ratio at a concentration of 1000 mg/L demonstrated complete antibacterial effectiveness against Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, and Bacillus subtilis within 30 min. Similarly, the nanoparticles achieved 100 % antibacterial efficiency against Candida albicans within 90 min. The antibacterial efficacy of 1000 mg/L 1:2 Bi₂WO₆/ZnO nanoparticles against Escherichia coli and Staphylococcus aureus was found to be 100 % within 5 min under natural lighting conditions. The findings indicate that Bi₂WO₆/ZnO nanoparticles have excellent photocatalytic broad-spectrum antibacterial efficacy.

近年来，水资源污染导致有害细菌通过水源传播，对人类、动物和植物的安全和福祉构成重大威胁。因此，人们越来越关注水资源的健康和卫生问题。光催化是一种新型且非常有效的抗菌方法，在抗菌研究领域备受关注。五水硝酸铋和二水钨酸钠通过简单的水热法制成了摩尔比为 1:1、1:2、1:3 和 1:4 的纳米花球 Bi2WO6/ZnO 光催化复合材料。首次展示了多孔纳米花球 Bi2WO6/ZnO 复合材料的光催化广谱抗菌活性。样品采用 X 射线衍射 (XRD)、X 射线光电子能谱 (XPS)、扫描电子显微镜 (SEM)、傅立叶变换红外光谱 (FT-IR) 和紫外-可见光谱 (UV-vis) 进行了分析。在 LED 光照射下，使用稀释涂布板技术对抗菌活性进行了评估。结果表明，与单独的 Bi2WO6 和 ZnO 相比，Bi2WO6/ZnO 复合材料对细菌和真菌的抗菌活性更强。当暴露在强度为 35 W 的 LED 灯光下时，Bi2WO6/ZnO 纳米粒子以 1:2 的比例、1000 mg/L 的浓度在 30 分钟内对大肠杆菌、金黄色葡萄球菌、绿脓杆菌和枯草杆菌完全有效。同样，纳米颗粒在 90 分钟内对白色念珠菌的抗菌效率也达到了 100%。在自然光照条件下，1000 mg/L 1:2 Bi2WO6/ZnO 纳米粒子在 5 分钟内对大肠杆菌和金黄色葡萄球菌的抗菌效力达到 100%。研究结果表明，Bi2WO6/氧化锌纳米粒子具有出色的光催化广谱抗菌功效。

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引用次数: 0

Improving the durability and investing failure behavior of TBCs under thermal cycling-CMAS test by Yb2O3 and Y2O3 co-stabilized ZrO2 materials and different processes 通过 Yb2O3 和 Y2O3 共稳定 ZrO2 材料及不同工艺改善热循环-CMAS 试验下 TBC 的耐久性和投资失效行为

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2024-09-28 DOI: 10.1016/j.ceramint.2024.09.250

Yangguang Liu , Wenkang Zhang , Weize Wang , Wei Liu , Ting Yang , Kaibin Li , Xiaoqin Zhang , Junhao Wang , Xiaofeng Zhao , Lirong Luo , Jin Yang , Chengcheng Zhang

Under extremely complex conditions, extending the lifetime of thermal barrier coatings (TBCs) is a challenge. In the present study, optimization of the coating structure and selection of coating materials are beneficial for improving the lifetime of TBCs under thermal cycling-CMAS (calcium-magnesium-alumina-silicate) test. It is efficient to obtain different layer thicknesses of multi-layer coating, including the micro-nano dual-scale layer, the dense YbYSZ layer (4.0 mol % Yb₂O₃ and 0.5 mol% Y₂O₃ co-stabilized ZrO₂), the porous YbYSZ layer and the laser 3D texturing layer, using the computational model under thermal load. Based on the corresponding coating structure and YbYSZ material, bond strength and thermal cycling-CMAS lifetime are evaluated, and compared with those of YSZ (4.5 mol % Y₂O₃ stabilized ZrO₂) coating. The results reveal that TBCs with porous embedded particle cluster (PEPC) structure is lower than that of YSZ coating. In addition, the original defects in multi-layer coating with grid texture reduce the bond strength. The lifetime of multi-layer coatings with a punctate texture are significantly improved in the thermal cycling-CMAS test, and their failure behavior includes fragmented and bulk-like exfoliation. This study emphasizes that combination of materials modification and structure optimization are a promising strategy to extend lifetime of TBCs.

在极其复杂的条件下，延长热障涂层（TBC）的使用寿命是一项挑战。在本研究中，涂层结构的优化和涂层材料的选择有利于提高热循环-CMAS（钙-镁-氧化铝-硅酸盐）测试下 TBC 的使用寿命。利用热负荷下的计算模型，可以有效地获得不同层厚的多层镀膜，包括微纳米双尺度层、致密 YbYSZ 层（4.0 mol % Yb2O3 和 0.5 mol % Y2O3 共稳定 ZrO2）、多孔 YbYSZ 层和激光三维纹理层。根据相应的涂层结构和 YbYSZ 材料，评估了结合强度和热循环-CMAS 寿命，并与 YSZ（4.5 mol % Y2O3 稳定 ZrO2）涂层的结合强度和热循环-CMAS 寿命进行了比较。结果表明，具有多孔嵌入颗粒簇（PEPC）结构的 TBC 比 YSZ 涂层低。此外，带有网格纹理的多层涂层中的原始缺陷也会降低结合强度。在热循环-CMAS 试验中，具有点状纹理的多层涂层的使用寿命显著提高，其失效行为包括碎裂和块状剥离。这项研究强调，将材料改性和结构优化相结合是延长 TBC 寿命的一种可行策略。

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引用次数: 0

Development of binder–free Ni3S2/CoS2 nano–composite as electrode material for energy storage application 开发作为储能应用电极材料的无粘结剂 Ni3S2/CoS2 纳米复合材料

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2024-09-27 DOI: 10.1016/j.ceramint.2024.09.332

Nigarish Bano , Syed Imran Abbas Shah , Abdus Sami , Muhammad Ali , Razan A. Alshgari , Saikh Mohammad , Muhammad Shuaib Khan , Muhammad Faheem Ashiq

Global energy crisis imposes immense obstacles leading towards development of innovative devices, and supercapacitors (SCs) are thought to be a viable energy storage technology. The engineering of nanostructured materials with a distinct and consistent morphological design is seen as a better option for various range of electrochemical energy sources. This study reports novel binder-free Ni₃S₂/CoS₂ electrode material that acquires higher energy, higher energy density, as well as its simple preparation method, low cost, and earth–abundant resources. The morphological, structural, and textural characteristics resulted in surface area of 46 m² g⁻¹ of Ni₃S₂/CoS₂ that will increase active sites also. The synthesized nanocomposite has particle size of 41.1 nm that leads to enhanced active sites and greater surface area as confirmed through BET analysis. Ni₃S₂/CoS₂ nanocomposite has high specific capacity around 828.14 F g⁻¹ at 5 mV s⁻¹ sweep rate using 2 M KOH, a high energy density around 115.01 Wh kg⁻¹, and power density of 1000 Wh kg⁻¹. Ni₃S₂/CoS₂ acquires higher ionic conductivity of 5 S m⁻¹, this will enhance the inter-layer transference of electrons, and these results perfectly correlates with EIS, resulting in charge transfer resistance value of 0.9 Ω for nano-composite. These enhanced electrochemical capabilities of Ni₃S₂/CoS₂ hold significant potential in practical viability.

全球能源危机给创新设备的开发带来了巨大障碍，而超级电容器（SC）被认为是一种可行的储能技术。具有独特、一致形态设计的纳米结构材料被认为是各种电化学能源的更好选择。本研究报道了新型无粘结剂 Ni3S2/CoS2 电极材料，它具有更高的能量、更高的能量密度，以及制备方法简单、成本低廉和地球资源丰富等优点。从形态、结构和纹理特征来看，Ni3S2/CoS2 的表面积为 46 m2 g-1，这也将增加活性位点。合成的纳米复合材料的粒径为 41.1 nm，这使得活性位点增加，比表面积增大，BET 分析证实了这一点。Ni3S2/CoS2 纳米复合材料在使用 2 M KOH 的 5 mV s-1 扫频条件下具有约 828.14 F g-1 的高比容量、约 115.01 Wh kg-1 的高能量密度和 1000 Wh kg-1 的功率密度。Ni3S2/CoS2 获得了 5 S m-1 的较高离子电导率，这将增强层间电子转移，这些结果与 EIS 完全吻合，从而使纳米复合材料的电荷转移电阻值达到 0.9 Ω。这些增强的 Ni3S2/CoS2 电化学能力在实际应用中具有巨大的潜力。

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引用次数: 0

Effect of CeO2 on the preparation of functional ceramsite and the adsorption effect of ammonia-nitrogen wastewater treatment CeO2 对功能陶瓷石制备的影响及氨氮废水处理的吸附效果

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2024-09-26 DOI: 10.1016/j.ceramint.2024.09.315

Wenxian Hu , Yifan Chai , Peijun Liu , Shengli An , Jun Peng

This study investigates the effect of rare earth oxide CeO₂ on the physical properties of ceramsite and its efficiency in treating ammonia-nitrogen wastewater. Ceramsite was prepared from solid waste with 10 % coal gangue added as a pore-forming agent. Ceramsite sample I with CeO₂ and sample II without CeO₂ were prepared using pure reagents. The process parameters for both samples were optimized using an orthogonal test. Additionally, the effects of CeO₂ on ceramsite performance and the treatment of ammonia-nitrogen wastewater were studied, and the adsorption mechanism of CeO₂ on ammonia-nitrogen wastewater was clarified. The process parameters for preparing ceramsite sample Ⅰ were: preheating for 30 min at 600 °C, followed by roasting for 20 min at 1090 °C. The parameters for preparing ceramsite sample Ⅱ were: preheating for 30 min at 600 °C, followed by roasting time for 15 min at 1090 °C. The presence of CeO₂ increased the porosity of the ceramsite by 0.89 % and the specific surface area by 0.66 m²/g. Under neutral environmental conditions of water samples, CeO₂ increased the removal rate of ammonia nitrogen by 1.85 %. Ceramsite has a high porosity and specific surface area, indicating that it has abundant internal pores, a large contact area with ammonia-nitrogen, a strong ability to remove ammonia nitrogen, and resistance to erosion and water flow shear, which are conducive to the treatment of ammonia-nitrogen wastewater.

本研究探讨了稀土氧化物 CeO2 对陶瓷石物理性质的影响及其处理氨氮废水的效率。陶瓷石由固体废弃物制备而成，其中添加了 10% 的煤矸石作为孔隙形成剂。使用纯试剂制备了含 CeO2 的陶瓷石样品 I 和不含 CeO2 的样品 II。采用正交试验对两种样品的工艺参数进行了优化。此外，还研究了 CeO2 对陶瓷石性能和氨氮废水处理的影响，并阐明了 CeO2 对氨氮废水的吸附机理。制备陶瓷石样品Ⅰ的工艺参数为：600 ℃预热 30 分钟，然后在 1090 ℃焙烧 20 分钟。制备陶瓷石样品Ⅱ的工艺参数为：在 600 ℃ 预热 30 分钟，然后在 1090 ℃ 焙烧 15 分钟。CeO2 的存在使陶瓷石的孔隙率增加了 0.89%，比表面积增加了 0.66 m2/g。在水样的中性环境条件下，CeO2 使氨氮的去除率提高了 1.85%。陶瓷石具有较高的孔隙率和比表面积，表明其内部孔隙丰富，与氨氮的接触面积大，去除氨氮的能力强，且耐侵蚀和水流剪切，有利于氨氮废水的处理。

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引用次数: 0

In-situ growth of CuO nanorods on sensing electrodes and their gas sensing properties of VOCs 在传感电极上原位生长氧化铜纳米棒及其对挥发性有机化合物的气体传感特性

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2024-09-26 DOI: 10.1016/j.ceramint.2024.09.336

Xiangxiang Chen , Shiyi Huang , Zhaoyang Zhang , Lu Qiu , Fangzheng Liu , Tianhao Liu , Yunfei Ouyang , Yanbai Shen

The CuO nanorods were in-situ grown on sensing electrodes by a chemical bath method for the detection of volatile organic compounds (VOCs). The synthesized material was characterized by using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Fourier-transform infrared spectroscopy (FTIR). The CuO nanorods, with lengths of 100–150 nm and diameters of 35–55 nm, were uniformly formed into a thin film on the electrode surface, with a thickness of approximately 1 μm. The gas test results demonstrated that the sensor achieved a peak response of 1.32 for formaldehyde at 200 °C, and a response of 1.92 for ethanol at 175 °C. At a concentration of 50 ppm, ethanol and formaldehyde at an operating temperature of 200 °C exhibit short response/recovery times of 28 s/48 s for ethanol and 45 s/62 s for methanol, respectively, coupled with good reproducibility. Moreover, the sensor exhibited a power-law response to varying gas concentrations and showcased superior selectivity in the VOCs gas detection. This in-situ growing CuO of our work provides a facial gas sensing material fabricated method.

采用化学浴法在传感电极上原位生长了用于检测挥发性有机化合物（VOC）的氧化铜纳米棒。利用 X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、透射电子显微镜 (TEM)、X 射线光电子能谱 (XPS) 和傅立叶变换红外光谱 (FTIR) 对合成材料进行了表征。长度为 100-150 nm、直径为 35-55 nm 的氧化铜纳米棒在电极表面均匀地形成了一层薄膜，厚度约为 1 μm。气体测试结果表明，该传感器在 200 °C 时对甲醛的峰值响应为 1.32，在 175 °C 时对乙醇的响应为 1.92。浓度为 50 ppm 时，工作温度为 200 °C 的乙醇和甲醛的响应/恢复时间较短，乙醇分别为 28 秒/48 秒，甲醇分别为 45 秒/62 秒，而且重现性良好。此外，该传感器对不同浓度的气体表现出幂律响应，在检测挥发性有机化合物气体时表现出卓越的选择性。我们工作中的这种原位生长 CuO 提供了一种面部气体传感材料的制造方法。

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引用次数: 0