Materials Research Bulletin最新文献_第2页

Evaluating the effect of A- and B-site cobalt doping on the structural, morphological, dielectric, and non-ohmic properties of CaCu3Ti4O12 ceramics prepared by the hydrothermal method 评估 A 位和 B 位钴掺杂对水热法制备的 CaCu3Ti4O12 陶瓷的结构、形态、介电和非欧姆特性的影响

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin

Pub Date : 2024-11-06 DOI: 10.1016/j.materresbull.2024.113182

El Houcine Lahrar , Hafida Essaoudi

CaCu₃Ti₄O₁₂ (CCTO), CaCu_3-xCo_xTi₄O₁₂ (CCC_xTO) and CaCu₃Ti_4-xCo_xO₁₂ (CCTC_xO) ceramics with x = 0.1 were synthesized by the hydrothermal process at 200 °C for 24 h. The influence of cobalt substitution on the copper and titanium sites in CaCu₃Ti₄O₁₂ on the structural, morphological, and physical properties was investigated. It was shown through the analysis of X-ray diffractograms of CCTO, CCC_xTO, and CCTC_xO compounds that they crystallized in a pure perovskite structure without the presence of secondary phases. The refinement of the spectra using the Rietveld method showed an efficient formation of the crystalline phase of the cubic structure (Im

\bar{3}

), which remains unchanged, with an increase in the unit cell due to the substitution of Co²⁺/Co³⁺ in the Cu²⁺ and Ti⁴⁺ sites of the CCTO ceramic. Raman spectroscopy was used as a complementary characterization method to XRD in order to detect vibrational bands and highlight any changes in the crystal lattice. SEM results showed that cobalt insertion increased the average grain size. The dielectric properties were studied by complex impedance spectroscopy in a frequency range from 1 kHz to 1 MHz at different temperatures, where the insertion of cobalt in the Cu²⁺ and Ti⁴⁺ sites has a significant effect on the permittivity value (ε_r) and dielectric losses (tanδ). The non-ohmic characteristics showed that the change in grain size due to cobalt incorporation is beneficial to improving the breakdown strength (E_b) and nonlinear coefficient (α), which can be attributed to the grain boundary properties of the Internal Barrier Layer Capacitor (IBLC) model and the behavior of the Schottky barrier.

在 200 °C、24 小时的水热过程中合成了 CaCu3Ti4O12 (CCTO)、CaCu3-xCoxTi4O12 (CCCxTO) 和 x = 0.1 的 CaCu3Ti4-xCoxO12 (CCTCxO) 陶瓷。通过对 CCTO、CCCxTO 和 CCTCxO 复合物的 X 射线衍射图分析表明，它们结晶为纯粹的包晶结构，不存在次生相。利用里特维尔德法对光谱进行的细化显示，立方结构的晶体相（Im3¯）有效形成，该结构保持不变，但由于在 CCTO 陶瓷的 Cu2+ 和 Ti4+ 位点中置换了 Co2+/Co3+ ，单胞有所增加。拉曼光谱被用作 XRD 的补充表征方法，以检测振动带并突出晶格的任何变化。扫描电镜结果表明，钴的插入增加了平均晶粒尺寸。在不同温度下，在 1 kHz 至 1 MHz 的频率范围内，通过复阻抗光谱对介电特性进行了研究，发现钴在 Cu2+ 和 Ti4+ 位点的插入对介电常数值（εr）和介电损耗（tanδ）有显著影响。非欧姆特性表明，钴的加入导致的晶粒尺寸变化有利于提高击穿强度（Eb）和非线性系数（α），这可归因于内部势垒层电容器（IBLC）模型的晶界特性和肖特基势垒的行为。

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引用次数: 0

A novel RuO₂@ZnO-Alginate-Halloysite composite for the effective degradation of Eosin Yellow dye and Ciprofloxacin drug 一种有效降解曙红染料和环丙沙星药物的新型 RuO₂@ZnO-Alginate-Halloysite 复合材料

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin

Pub Date : 2024-11-06 DOI: 10.1016/j.materresbull.2024.113178

W. Albuquerque , Pollyana Trigueiro , Benvinda V. Silva , L. Neves , Luciano C. Almeida , Ramón R. Peña-Garcia

This research explores the synthesis and application of a novel RuO₂@ZnO-Alginate-Halloysite composite to effectively mitigate Eosin Yellow (EY) and Ciprofloxacin (CIP). The composite exhibited a predominant zinc oxide (ZnO) phase with added ruthenium oxide (RuO₂), alginate, and halloysite components, confirmed through X-ray diffractogram (XRD), Raman, and Fourier Transform Infrared Spectroscopy (FTIR). The addition of RuO₂ did not alter the crystal structure significantly. Still, it impacted the optical properties, with the band gap energies ranging from 3.281 to 3.252 eV, indicating a redshift associated with increased RuO₂ concentration. The composites were tested for EY and CIP photocatalytic degradation under UV light. The composites containing 2 and 3 % of RuO₂ presented impressive photocatalytic performance, achieving up to 82.53 % degradation of CIP and 68.68 % of EY under UV irradiation respectively, highlighting its potential as a robust solution for environmental remediation. The study employed a series of scavenger tests to identify the primary reactive species involved in the photocatalytic degradation of ciprofloxacin drug and eosin yellow dye. The introduction of benzoquinone led to a significant decrease in photocatalytic activity, indicating that superoxide (•O₂⁻) and hydroxyl radicals (•OH) are the dominant species in the photocatalytic degradation of CIP and EY, respectively. The synergistic effects of these reactive species contribute significantly to the photocatalytic performance of the composite material. Finally, the composites showed good recyclability, maintaining substantial degradation performance over multiple cycles. The significance of this study is underscored by the urgent need to find effective methods for removing hazardous compounds from wastewater, a growing concern due to their harmful impact on aquatic ecosystems and human health.

本研究探索了一种新型 RuO₂@ZnO-Alginate-Halloysite 复合材料的合成和应用，该材料可有效缓解伊红（EY）和环丙沙星（CIP）。经 X 射线衍射图 (XRD)、拉曼光谱和傅立叶变换红外光谱 (FTIR) 证实，该复合材料以氧化锌 (ZnO) 相为主，并添加了氧化钌 (RuO₂)、海藻酸盐和哈洛石成分。RuO₂ 的加入并没有明显改变晶体结构。不过，它还是影响了光学特性，带隙能在 3.281 至 3.252 eV 之间，表明随着 RuO₂ 浓度的增加而发生了红移。复合材料在紫外光下进行了 EY 和 CIP 光催化降解测试。RuO2 含量分别为 2% 和 3% 的复合材料表现出令人印象深刻的光催化性能，在紫外线照射下，CIP 和 EY 的降解率分别高达 82.53% 和 68.68%，凸显了其作为一种可靠的环境修复解决方案的潜力。研究采用了一系列清除剂测试，以确定参与环丙沙星药物和曙红黄色染料光催化降解的主要反应物。引入苯醌会导致光催化活性显著下降，这表明超氧自由基（-O₂-）和羟自由基（-OH）分别是光催化降解环丙沙星和曙红染料的主要反应物。这些反应物的协同效应大大提高了复合材料的光催化性能。最后，复合材料显示出良好的可回收性，在多次循环中仍能保持可观的降解性能。由于有害化合物对水生生态系统和人类健康的有害影响，人们越来越关注如何找到有效的方法去除废水中的有害化合物，这也凸显了本研究的重要意义。

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引用次数: 0

Advancement in the thermoelectric performance of bulk SnSe: GGA+U approach for band gap calculation and strain induced thermal conductivity 体SnSe热电性能的进步：带隙计算和应变诱导热导率的 GGA+U 方法

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin

Pub Date : 2024-11-06 DOI: 10.1016/j.materresbull.2024.113181

Hashir P , Parvathy T , Aadil Fayaz Wani , Kulwinder Kaur , P․P Pradyumnan

The utilization of thermoelectric technology for harnessing electricity from waste heat has received considerable interest in recent years. Nevertheless, it is essential to develop high-performance thermoelectric materials that exhibit outstanding conversion efficiency to satisfy the world's energy needs. Density Functional Theory (DFT) techniques have gained wide spread recognition as computational simulation methods for determining electronic properties within materials science. The Boltzmann transport equation, used in conjunction with DFT, serves as a valuable tool for predicting the thermoelectric characteristics of various materials. In this investigation, we conducted a comprehensive analysis of the thermoelectric properties of SnSe using the Quantum Espresso software. Generalized gradient approximations were used as the exchange-correlation functional, which approximates the exchange and correlation energies between electrons in many-body problems. The investigation of core electrons employed ultrasoft pseudopotentials. Additionally, the Hubbard correction tool was applied for the final calculation of the band gap. The optimized structure used for the investigation of the thermoelectric properties of bulk SnSe was supported by the BoltzTraP code. Thermal conductivity studies were conducted using Slack's equation, which incorporates both elastic and lattice characteristics. The examination focused on assessing the impact of changes in lattice strain on lattice thermal conductivity. Notably, a significant alteration in the thermoelectric figure of merit was observed due to the applied lattice strain.

近年来，利用余热发电的热电技术受到了广泛关注。然而，为满足世界能源需求，开发具有出色转换效率的高性能热电材料至关重要。密度泛函理论（DFT）技术作为确定材料科学中电子特性的计算模拟方法，已得到广泛认可。与 DFT 结合使用的玻尔兹曼输运方程是预测各种材料热电特性的重要工具。在这项研究中，我们使用 Quantum Espresso 软件对 SnSe 的热电特性进行了全面分析。我们使用广义梯度近似作为交换相关函数，该函数近似于多体问题中电子间的交换和相关能量。对核心电子的研究采用了超软伪势。此外，在最终计算带隙时还使用了哈伯德修正工具。BoltzTraP 代码支持用于研究块状 SnSe 热电特性的优化结构。导热性研究采用了斯拉克方程，其中包含了弹性和晶格特性。研究重点是评估晶格应变变化对晶格热导率的影响。值得注意的是，由于施加了晶格应变，热电功勋值发生了显著变化。

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引用次数: 0

Li7P3S11 double-layer electrolyte for silicon-based all-solid-state batteries: Interface SiS2-doping 用于硅基全固态电池的 Li7P3S11 双层电解质：界面掺杂SiS2

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin

Pub Date : 2024-11-06 DOI: 10.1016/j.materresbull.2024.113179

Nantao Chen, Huiyao Li, Youlan Zou, Zhuoran Ao, Peiguang Li, Yinan Lao, Yu Wan

Sulfide solid electrolytes is indispensable for developing all-solid-state batteries with Si-based anode for its superior ionic conductivity and excellent mechanical ductility. However, the unfriendly interface between sulfide and silicon still leads to poor cycling performance. Herein, we report a SiS₂-doping Li₇P₃S₁₁ (LPS-xSi) membrane sandwiched between Li₇P₃S₁₁ electrolyte and Si electrode to form double-layer sulfide electrolyte (LPS-xSi|LPS). LPS-xSi|LPS double-layer contacts well with Si anode and forms Li-Si alloys at the interface to eliminate the adverse side reactions and promote the Li⁺ transmission of the interface. The LPS-2Si|LPS possesses the highest ionic conductivity of 5.4 × 10⁻⁴ S cm⁻¹ at 30 °C. LiIn | LPS-2Si|LPS | LiIn cell works steadily for more than 1000 h at 30 ℃ with 0.1 mA cm⁻². The assembled 99 wt.% Si | LPS-2Si|LPS | LiIn cell exhibits an initial discharge capacity of 2208.7 mAh g⁻¹ and remains 339.5 mAh g⁻¹ after 100 cycles.

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引用次数: 0

Electrochemical behavior of tantalum ion in LiF-NaF-K2TaF7 molten salt system 钽离子在 LiF-NaF-K2TaF7 熔盐体系中的电化学行为

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin

Pub Date : 2024-11-06 DOI: 10.1016/j.materresbull.2024.113180

Junyi Tan, Bo Jing, Qiuju Li, Cong Liang, Xiao Guo

It is of great significance to clarify the electrochemical behavior of Ta⁵⁺ in LiF-NaF-K₂TaF₇ molten salt systems for the preparation of tantalum metal by molten salt electrodeposition. The aim of this work was to explore the reaction steps and behavior of the reduction of metal Ta from Ta⁵⁺ in fluorine molten salt by electrochemical method. The cyclic voltammetry, square wave voltammetry, chronopotentiometry were used to determine the reduction steps of Ta⁵⁺. The results showed that there were two reduction steps which the first reduction step R₁ was

{TaF}_{7}^{2 -} + 2 e^{-} ⇌ Ta F_{3} + 4 F^{-}

and the second reduction step R₂ was

Ta F_{3} + 3 e^{-} \to Ta + 3 F^{-}

. SEM, XRD and EDS results showed that the reduction product of Ta⁵⁺ in molten salt is Ta and the tantalum atom was selectively deposited and grew on the (200) crystal plane in priority.

澄清 Ta5+ 在 LiF-NaF-K2TaF7 熔盐体系中的电化学行为对利用熔盐电沉积制备金属钽具有重要意义。这项研究的目的是通过电化学方法探索在氟熔盐中用 Ta5+ 还原金属 Ta 的反应步骤和行为。研究采用了循环伏安法、方波伏安法和计时电位法来确定 Ta5+ 的还原步骤。结果表明存在两个还原步骤，第一个还原步骤 R1 为 TaF72-+2e-⇌TaF3+4F-，第二个还原步骤 R2 为 TaF3+3e-→Ta+3F-。SEM、XRD 和 EDS 结果表明，Ta5+ 在熔盐中的还原产物是 Ta，钽原子被选择性地沉积并优先生长在（200）晶面上。

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引用次数: 0

SnS2/ZIF-67 nanocomposite: A novel bifunctional, highly efficient, and reusable photocatalyst for enhanced visible-light-assisted biodiesel production and degradation of tinidazole SnS2/ZIF-67 纳米复合材料：一种新型双功能、高效、可重复使用的光催化剂，用于增强可见光辅助生物柴油的生产和替硝唑的降解

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin

Pub Date : 2024-11-05 DOI: 10.1016/j.materresbull.2024.113177

Vishal Gadore, Soumya Ranjan Mishra, Md. Ahmaruzzaman

Herein, a novel bifunctional, highly efficient and reusable visible-light active SnS₂/ZIF-67 nanocomposite was fabricated for improved photodegradation of tinidazole (TDZ) and photocatalytic biodiesel production from soyabean oil. An improved photocatalytic performance was ascribed to the enhanced separation of charges and narrow-bandgap energy of the photocatalyst by synergistic- interaction between SnS₂ and ZIF-67. Within 60 min of irradiation, 96.31± 1.62 % of 15 ppm TDZ could be removed by 0.3 mM H₂O₂, 0.4 g/L of prepared photocatalyst under mild-conditions. The appraisal of photocatalytic activity of SnS₂/ZIF-67 nanocomposite for photocatalytic degradation of TDZ under actual wastewater conditions was studied by introducing various co-existing ions and water matrices. The SnS₂/ZIF-67 photocatalyst showed biodiesel yield of 91.25 ± 1.58 % at photocatalyst loading of 3 wt% and methanol-to-oil ratio of 10:1 within 50 min of light-irradiation. The current research highlighted the potential of metal-sulphides for water remediation and biodiesel production under light-irradiation.

本文制备了一种新型双功能、高效、可重复使用的可见光活性 SnS2/ZIF-67 纳米复合材料，用于改进对替硝唑（TDZ）的光降解以及从大豆油中光催化生产生物柴油。光催化性能的提高归因于 SnS2 和 ZIF-67 之间的协同作用增强了光催化剂的电荷分离和窄带隙能。在温和条件下，0.3 mM H2O2、0.4 g/L 制备的光催化剂可在 60 分钟内去除 96.31± 1.62 % 的 15 ppm TDZ。通过引入各种共存离子和水基质，研究了 SnS2/ZIF-67 纳米复合材料在实际废水条件下光催化降解 TDZ 的光催化活性评价。在光催化剂负载量为 3 wt%、甲醇与油的比例为 10:1 的条件下，SnS2/ZIF-67 光催化剂在光照 50 分钟内的生物柴油产率为 91.25 ± 1.58%。目前的研究凸显了金属硫化物在光照下用于水修复和生物柴油生产的潜力。

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引用次数: 0

Interfacial polarization of different MnO2 crystal anchored on Ti3AlC2 to enhance the microwave absorption 锚定在 Ti3AlC2 上的不同 MnO2 晶体的界面极化以增强微波吸收

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin

Pub Date : 2024-11-05 DOI: 10.1016/j.materresbull.2024.113176

Zhouhao Peng , Zitong Wang , Chenglong Lei

Hierarchical MAX phase materials constructed with different MnO₂ crystal were designed for microwave absorbers. Different MnO₂ crystal loaded on Ti₃AlC₂ had an abundant and differentiated interfaces. Compactly loaded on the surface of Ti₃AlC₂, α-MnO₂/β-MnO₂ was a nanorod and δ-MnO₂ was a flower, but ε-MnO₂ was spherical separating from the Ti₃AlC₂. Relying on the synergistic effects of the interfacial and defect dipole polarizations, the optimal RL of Ti₃AlC₂@α-MnO₂ and Ti₃AlC₂@β-MnO₂ hybrids were -46.5 dB at 3.6 mm and -44 dB at 2.7 mm, respectively. The RL of Ti₃AlC₂@δ-MnO₂ hybrid was regulated by the matching thickness (-46.8 dB at 6.1 mm and -20 dB at 2 mm) and the broad EAB is 4.84 GHz. However, the RL of Ti₃AlC₂@ε-MnO₂ hybrid cannot reach -10 dB within the thickness of 1.0–5.0 mm, demonstrating the worst attenuation performance. This work offers an opportunity to elucidate the relationship between heterogeneous interface and microwave absorption.

用不同的二氧化锰晶体构建的分层 MAX 相材料被设计用于微波吸收器。负载在 Ti3AlC2 上的不同 MnO2 晶体具有丰富且不同的界面。紧密负载在Ti3AlC2表面的α-MnO2/β-MnO2呈纳米棒状，δ-MnO2呈花状，而ε-MnO2则呈球状与Ti3AlC2分离。依靠界面极化和缺陷偶极极化的协同效应，Ti3AlC2@α-MnO2 和 Ti3AlC2@β-MnO2 混合物的最佳 RL 分别为 3.6 mm 时 -46.5 dB 和 2.7 mm 时 -44 dB。Ti3AlC2@δ-MnO2 杂化物的 RL 受匹配厚度的调节（6.1 mm 时为 -46.8 dB，2 mm 时为 -20 dB），宽 EAB 为 4.84 GHz。然而，Ti3AlC2@ε-MnO2 杂化物的 RL 在 1.0-5.0 mm 厚度范围内达不到 -10 dB，显示出最差的衰减性能。这项研究为阐明异质界面与微波吸收之间的关系提供了机会。

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引用次数: 0

Electrical response and microstructure development in zinc oxide films sprayed from ethanolic solutions of different salts 不同盐的乙醇溶液喷涂的氧化锌薄膜的电反应和微观结构发展

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin

Pub Date : 2024-11-04 DOI: 10.1016/j.materresbull.2024.113174

L.A. Ramajo , D. Smirnoff , F. Schipani , R. Martín , E. Villegas , M. Sousa Góes , F. Martín , R. Parra

Zinc oxide thin films were grown by spray-pyrolysis on glass substrates from ethanolic solutions of zinc nitrate, zinc chloride and zinc acetate. Different microstructures were observed in the films prepared with the three salts used, which showed significant differences with respect to films prepared from aqueous solutions of the same salts. Polyethyleneglycol was also used as a pore-generating agent in order to modify the microstructure of denser films increasing the degree of porosity. The electrical response of the films at room temperature was evaluated under 365 nm ultraviolet light, and in the presence of hydrogen, separately. The microstructures developed in ZnO films by using different zinc salts is correlated with the measured electrical properties.

使用硝酸锌、氯化锌和醋酸锌的乙醇溶液在玻璃基底上通过喷雾热解法制备了氧化锌薄膜。在用这三种盐制备的薄膜中观察到了不同的微观结构，与用相同盐的水溶液制备的薄膜相比差异显著。聚乙二醇也被用作孔隙生成剂，以改变致密薄膜的微观结构，增加孔隙度。在 365 纳米紫外线和氢气存在下，分别评估了薄膜在室温下的电反应。使用不同锌盐在氧化锌薄膜中形成的微观结构与测得的电特性相关。

引用次数: 0

Synergistic effect of NASICON Na3V2(PO4)2F3 and 2D MXene for high-performance symmetric Sodium-ion batteries NASICON Na3V2(PO4)2F3 和二维 MXene 对高性能对称钠离子电池的协同效应

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin

Pub Date : 2024-11-02 DOI: 10.1016/j.materresbull.2024.113173

Buzaina Moossa , Jeffin James Abraham , Abdul Moiz Ahmed , Ramazan Kahraman , Siham Al-Qaradawi , R.A. Shakoor

Sodium fluorophosphate-based Na₃V₂(PO₄)₂F₃ (NVPF) cathode materials have been widely analyzed in Sodium-ion batteries (SIB) owing to their high energy density and high working voltage. However, the low electronic conductivity of NVPF is a factor hindering their efficient use. To enhance the electronic conductivity of NVPF, in this work, a porous Na₃V₂(PO₄)₂F₃ and a 2D Ti₃C₂ -based MXene nanocomposite was synthesized using a facile sol-gel method. The NVPF, with the presence of two active redox couples, is a suitable choice for symmetric batteries. The NVPF + 2D MXene nanocomposite was analyzed for its structural and thermal characteristics, and a symmetric cell prepared from them was investigated for its electrochemical characteristics. Structural analysis of the materials developed indicates that the MXene addition has not altered the crystal structure of the NVPF. A remarkable improvement in the electrochemical performance of NVPF in the sodium symmetric cell is noticed, as indicated by its high specific discharge capacity of 92mAhg^-1 at 1C for the MXene-incorporated composite structures. This improvement in electrochemical behaviour is confirmed in the rate capability curves, GCD curves, and GITT curves. The diffusion coefficient values obtained from GITT analysis showed improved kinetics in the synthesized material due to the MXene incorporation. The calculated values of the diffusion coefficient of Na⁺confirms the accelerated kinetics of Na⁺ ion migration during the intercalation/de-intercalation process in the MXene 5wt% nanocomposites, with a value of 9.57 × 10^–9 cm²s^-1 when compared to 4. 14 × 10^–9 cm²s^-1 for the pristine sample.

基于氟磷酸钠的 Na3V2(PO4)2F3（NVPF）阴极材料因其高能量密度和高工作电压而在钠离子电池（SIB）中得到广泛应用。然而，NVPF 的低电子传导性是阻碍其有效使用的一个因素。为了提高 NVPF 的电子导电性，本研究采用简便的溶胶-凝胶法合成了多孔 Na3V2(PO4)2F3 和二维 Ti3C2 基 MXene 纳米复合材料。NVPF 具有两种活性氧化还原偶，是对称电池的合适选择。对 NVPF + 2D MXene 纳米复合材料的结构和热特性进行了分析，并研究了用它们制备的对称电池的电化学特性。对所开发材料的结构分析表明，MXene 的添加并没有改变 NVPF 的晶体结构。加入 MXene 的复合结构在 1C 时的比放电容量高达 92mAhg-1，这表明钠对称电池中 NVPF 的电化学性能有了明显改善。这种电化学性能的改善在速率能力曲线、GCD 曲线和 GITT 曲线中得到了证实。通过 GITT 分析获得的扩散系数值显示，由于加入了 MXene，合成材料的动力学性能得到了改善。Na+ 扩散系数的计算值证实，在 MXene 5wt% 纳米复合材料的插层/去插层过程中，Na+ 离子迁移的动力学速度加快，其数值为 9.57 × 10-9 cm2s-1，而原始样品的数值为 4.14 × 10-9 cm2s-1。

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引用次数: 0

Photocatalytic performance of Ni-Al LDH @Ag2XO4 (X = Cr, Mo, and W) nanocomposites under visible light Ni-Al LDH @Ag2XO4（X = Cr、Mo 和 W）纳米复合材料在可见光下的光催化性能

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin

Pub Date : 2024-11-02 DOI: 10.1016/j.materresbull.2024.113171

Ghazal Salehi , Mojtaba Bagherzadeh , Mojtaba Hajilo , Davood Taherinia , Soheil Sojdeh , Moein Safarkhani , Yun Suk Huh

The contamination of water sources from dye discharge poses a significant environmental challenge. This study addresses this issue by synthesizing binary composites of Ni-Al LDH@Ag₂XO₄ (with X=Cr, Mo, and W). The main goal is to increase the separation of charge carriers to boost the efficiency of photocatalysis. The prepared samples were analyzed using FT-IR, FE-SEM, EDS, FE-TEM, XRD, UV–Vis DRS, and XPS techniques. Observations revealed a notable increase in MB degradation through photocatalysis under a 150 W mercury lamp in presence of Ni-Al LDH@Ag₂CrO₄ compared to individual samples, Ni-Al LDH and Ag₂CrO₄. At pH= 11, 0.5 g of Ni-Al LDH@Ag₂CrO₄ shows the highest activity (100 %) for the photodegradation of MB. The absorption edge of Ni-Al LDH@Ag₂CrO₄ (1.69 eV) has increased compared to that of Ni-Al LDH (2.53 eV), which increases the light absorption capacity. Moreover, the synergistic effect of Ni-Al LDH and Ag₂CrO₄ increases photocatalytic activity by reducing electron-hole recombination. The proposed Z-Scheme mechanism confirms effective charge separation and increased photocatalytic efficiency.

染料排放对水源的污染是一项重大的环境挑战。本研究通过合成 Ni-Al LDH@Ag2XO4 的二元复合材料（X=Cr、Mo 和 W）来解决这一问题。主要目的是增加电荷载流子的分离，从而提高光催化效率。利用傅立叶变换红外光谱、FE-SEM、EDS、FE-TEM、XRD、UV-Vis DRS 和 XPS 技术对制备的样品进行了分析。观察结果表明，与单个样品、Ni-Al LDH 和 Ag2CrO4 相比，在 150 W 汞灯下，Ni-Al LDH@Ag2CrO4 通过光催化降解甲基溴的能力显著提高。在 pH= 11 时，0.5 克 Ni-Al LDH@Ag2CrO4 对甲基溴的光降解活性最高（100%）。与 Ni-Al LDH（2.53 eV）相比，Ni-Al LDH@Ag2CrO4 的吸收边沿（1.69 eV）有所增加，从而提高了光吸收能力。此外，Ni-Al LDH 和 Ag2CrO4 的协同效应通过减少电子-空穴重组提高了光催化活性。提出的 Z-Scheme 机制证实了有效的电荷分离和光催化效率的提高。

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引用次数: 0