Diamond and Related Materials最新文献_第10页

NiCo2O4 loaded on jute fiber porous carbon as an anode material for lithium-ion batteries 负载在黄麻纤维多孔碳上的镍钴氧化物作为锂离子电池的负极材料

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2024-10-17 DOI: 10.1016/j.diamond.2024.111651

Kaifeng Yu , Ling Liu , Mingshu Chang , Xiaofeng Wang , Min Cheng , Shuang Gao

With the continuous development of science and technology, there is an increasing demand for batteries, and lithium-ion batteries (LIBs) are favored due to their compact size, strong energy storage capacity, long cycle life, lack of memory effect, and environmental friendliness, etc. The high theoretical specific capacity of NiCo₂O₄ makes it a promising material for an anode. However, it has many drawbacks, including a slow ion transfer rate and an easy way for volume to expand during charging and discharging. To address these limitations, we have developed a composite material. Jute fiber porous carbon was successfully prepared by high-temperature activation using jute fiber as the carbon matrix and potassium carbonate as the activator, and NiCo₂O₄ was loaded onto the jute fiber porous carbon and named NiCo₂O₄@JFPC. The jute fiber porous carbon serves as a carbon matrix that effectively improves the electrical conductivity of the composites while also slowing down the volume expansion caused by the frequent embedding/de-embedding of lithium ions, and at the same time, providing more effective paths for the transport of lithium ions. The NiCo₂O₄@JFPC composites were synthesized by solvothermal method. The effects of varying calcination temperatures (250, 350, and 450 °C) on the properties of the composites were investigated. The discharge capacity of NiCo₂O₄@JFPC-350 reached 1217.9 mAh g⁻¹ after 100 cycles at 0.2C at a calcination temperature of 350 °C.

随着科学技术的不断发展，人们对电池的需求越来越大，而锂离子电池（LIB）因其体积小、储能能力强、循环寿命长、无记忆效应、环保等优点而备受青睐。镍钴氧化物具有很高的理论比容量，因此是一种很有前途的负极材料。然而，它也有许多缺点，包括离子传输速率慢，充放电过程中体积容易膨胀。为了解决这些局限性，我们开发了一种复合材料。以黄麻纤维为碳基体，碳酸钾为活化剂，通过高温活化成功制备了黄麻纤维多孔碳，并将镍钴氧化物负载到黄麻纤维多孔碳上，命名为镍钴氧化物@JFPC。黄麻纤维多孔碳作为碳基体，在有效提高复合材料导电性能的同时，也减缓了锂离子频繁嵌入/脱嵌引起的体积膨胀，同时为锂离子的传输提供了更有效的路径。镍钴氧化物@JFPC复合材料是通过溶热法合成的。研究了不同煅烧温度（250、350 和 450 ℃）对复合材料性能的影响。在煅烧温度为 350 °C 时，镍钴氧化物@JFPC-350 在 0.2C 下循环 100 次后，放电容量达到 1217.9 mAh g-1。

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引用次数: 0

A multifunctional smart fabric based on reduced graphene oxide for next generation military couture 基于还原氧化石墨烯的多功能智能织物，适用于下一代军用时装

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2024-10-17 DOI: 10.1016/j.diamond.2024.111669

Srimathi Krishnaswamy , Vishnu Damodaran Nambissan , Akilandaeswari Jeyaraj , Kanishka Gopalakrishnan Raguraman , Ragul Rajesh Vel murugan , Sathyanarayana N. Gummadi

Multifunctional smart apparel with comfortable, hydrophobic, flexible, and washable nature is needed for next-generation fabrics in the military sector. Hence, we synthesized reduced graphene oxide (RGO) by cost- effective route and embedded on cotton cloth with polyvinyl alcohol as binder. X-ray diffraction pattern (XRD) and Raman spectra confirmed formation of RGO. RGO exhibited a broad response covering UV, Visible, and near-infrared regions of the solar spectrum. The photocatalytic efficiency of 50 mg RGO for 10 ppm methylene blue is 73 % at visible light in 2 h 15 min. Different ratios of polyvinyl alcohol (PVA) and RGO (1:1, 1:2. 1:4 and 1:6) were taken and coated on cotton cloth. The higher concentration of RGO(3RPC) on cloth exhibited a bandgap of 1.67 eV and contact angle of 134.45°. Lower water absorption ability (28 %) and water solubility ability (7.9 %) of 3RPC indicate it is concurrent with contact angle. 3RPC is lightweight, flexible, and hydrophobic and it exhibits broad absorption with low bandgap. Due to the water repellence nature and broad absorption, 3RPC can used as self-cleaning apparel for military society.

军事领域需要具有舒适、疏水、柔韧和可清洗特性的多功能智能服装，以满足下一代织物的需求。因此，我们采用经济有效的方法合成了还原氧化石墨烯（RGO），并以聚乙烯醇为粘合剂将其嵌入棉布上。X 射线衍射图（XRD）和拉曼光谱证实了 RGO 的形成。RGO 对太阳光谱中的紫外线、可见光和近红外区域具有广泛的响应。在可见光下，50 毫克 RGO 在 2 小时 15 分钟内对 10ppm 亚甲基蓝的光催化效率为 73%。取不同比例的聚乙烯醇（PVA）和 RGO（1:1、1:2、1:4 和 1:6）涂布在棉布上。浓度较高的 RGO（3RPC）在棉布上的带隙为 1.67 eV，接触角为 134.45°。3RPC 较低的吸水能力（28%）和水溶性（7.9%）表明它与接触角同时存在。3RPC 具有轻质、柔韧和疏水性的特点，并且具有低带隙的宽吸水性。由于 3RPC 具有防水性和广泛的吸水性，因此可用作军事社会的自洁服装。

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引用次数: 0

One step synthesis of carboxymethyl cellulose/graphene oxide composites for removal of copper ion from aqueous solution 一步法合成用于去除水溶液中铜离子的羧甲基纤维素/氧化石墨烯复合材料

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2024-10-16 DOI: 10.1016/j.diamond.2024.111670

Jinjin Cui , Hui Chen , Ying Chen , Xiaojuan Zhou

Excessive heavy metal ions in the environment often have an impact on plant growth and human health. In this study, carboxymethyl cellulose/graphene oxide composites (CMC/GO) were prepared by a simple solution blending evaporation method to remove copper ions. The structure of CMC/GO was characterized by Fourier transform infrared spectroscopy, X-ray diffraction, Scanning electron microscope, Brunauer–Emmett–Teller, and X-rayphotoelectron spectroscopy. The results showed that the maximum adsorption capacity of the adsorbent CMC/GO reached 26.05 mg/g, when the pH of the solution was 5, the initial concentration of copper ions was 80 mg/L, and the dosage of the adsorbent was 0.4 g. The adsorption of copper ions onto CMC/GO is validated by the pseudo-second-order kinetics model (R = 0.99949), and the adsorption isotherm data was fitted well with the Langmuir isotherm (R = 0.99989). Thermodynamic data showed that the adsorption process of copper ions by composite CMC/GO is a spontaneous endothermic reaction (ΔG < 0, ΔH > 0). Moreover, the adsorbent showed better recyclability and the adsorption efficiency can still reach 85.0 % after 5 adsorption-desorption cycles.

环境中过量的重金属离子通常会对植物生长和人类健康造成影响。本研究采用简单的溶液混合蒸发法制备了羧甲基纤维素/氧化石墨烯复合材料（CMC/GO），用于去除铜离子。通过傅立叶变换红外光谱、X 射线衍射、扫描电子显微镜、Brunauer-Emmett-Teller 和 X 射线光电子能谱对 CMC/GO 的结构进行了表征。结果表明，当溶液的 pH 值为 5、铜离子的初始浓度为 80 mg/L、吸附剂的用量为 0.4 g 时，CMC/GO 对铜离子的最大吸附量达到 26.05 mg/g。热力学数据表明，CMC/GO 复合材料对铜离子的吸附过程是一个自发的内热反应（ΔG <0，ΔH >0）。此外，该吸附剂具有较好的可回收性，吸附-解吸循环 5 次后，吸附效率仍可达 85.0%。

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引用次数: 0

Material removal mechanism of TiCp/Fe composite by multi-diamond-abrasive-grinding considering the random distribution characteristics of particles 考虑颗粒随机分布特性的多金刚石磨料磨削 TiCp/Fe 复合材料的材料去除机理

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2024-10-16 DOI: 10.1016/j.diamond.2024.111675

Qingzhe Meng , Zhenzhong Zhang , Laixiao Lu , Hongyu Xing , Xiaoliang Liang

The TiC ceramics reinforced Fe matrix composite (TiCp/Fe) exhibits exceptional properties, including high hardness, strength, wear, and heat resistance. This study focuses on investigating the material removal mechanism to achieve high-quality and low-damage surfaces. A three-dimensional particle random distribution algorithm is proposed based on the random distribution characteristics of TiC particles. Furthermore, a multi-diamond-abrasive grinding finite element model is established using the Rayleigh probability distribution model to account for the randomness of undeformed chip thickness during the grinding process. This study combines experimental and simulation analyses to investigate the variations in grinding forces, stress field distributions, and surface and subsurface quality. The results reveal that the material removal process can be categorized into five stages: ploughing of the Fe matrix and TiC particle, TiC particle crack initiation, TiC particle crack extension, and TiC particle fracture. Moreover, the process of removing TiC particles can be further grouped into ductile removal, ductile-brittle removal, and brittle removal, depending on the undeformed chip thickness. This study improves the comprehension of the mechanism of TiCp/Fe composite material and establishes a significant practical guidance for the diamond grinding processing of metal matrix composites.

TiC 陶瓷增强铁基复合材料（TiCp/Fe）具有优异的性能，包括高硬度、高强度、耐磨性和耐热性。本研究的重点是研究材料去除机制，以获得高质量和低损伤的表面。根据 TiC 颗粒的随机分布特性，提出了一种三维颗粒随机分布算法。此外，利用瑞利概率分布模型建立了多金刚石磨削有限元模型，以考虑磨削过程中未变形切屑厚度的随机性。本研究结合实验和模拟分析，研究了磨削力、应力场分布以及表面和次表面质量的变化。结果表明，材料去除过程可分为五个阶段：铁基体和 TiC 粒子的犁耕、TiC 粒子裂纹的产生、TiC 粒子裂纹的扩展和 TiC 粒子的断裂。此外，根据未变形切屑厚度的不同，TiC 颗粒的去除过程还可进一步分为韧性去除、韧性-脆性去除和脆性去除。这项研究加深了对 TiCp/Fe 复合材料机理的理解，为金属基复合材料的金刚石磨削加工提供了重要的实践指导。

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引用次数: 0

Facile synthesis of silver and copper modified graphitic carbon nitride for volatile organic compounds sensing 用于挥发性有机化合物传感的银和铜修饰石墨氮化碳的简易合成

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2024-10-16 DOI: 10.1016/j.diamond.2024.111671

Azhar Ali Haidry , Muhammad Fanan Khan , Adil Raza , Talha Amin , Muhammad Kashif , Kareem Yusuf

Volatile organic compounds (VOCs) pose significant health risks when inhaled or ingested in large quantities. Metal oxide-based solid-state gas sensors are commonly utilized for VOCs detection, including methanol, however their high operating temperature and selectivity are both biggest challenges. In this context, graphitic carbon nitride (g-C₃N₄) has emerged as a promising alternative for VOCs sensing due to its superior sensing properties. In this work, Cu and Ag doped g-C₃N₄ was synthesized via the polycondensation method for VOCs sensing applications. All the samples showed a selective response to methanol at room temperature. Notably, the Ag/g-C₃N₄ sensor exhibited a significantly enhanced response (~27.5) compared to both undoped g-C₃N₄ (~3.58) and Cu/g-C₃N₄ (~9.82) sensors towards 200 ppm methanol. The Ag/C₃N₄ based sensor showed rapid response (21 s) and recovery (17 s) times, along with excellent short-term and long-term stability. It was found that Ag/C₃N₄ sensor exhibited a good response to humidity levels ranging from 9 % to 93 % RH, without any significant variation observed when deposited on the ceramic and flexible polyimide substrates. Further, considering its practical applicability, the Ag/C₃N₄ sensor showed successful detection of alcohol in human breath, highlighting its potential for real-world applications.

大量吸入或摄入挥发性有机化合物（VOC）会对健康造成严重危害。基于金属氧化物的固态气体传感器通常用于检测包括甲醇在内的挥发性有机化合物，但其较高的工作温度和选择性是最大的挑战。在这种情况下，石墨氮化碳（g-C3N4）因其优越的传感特性而成为 VOCs 传感的一种有前途的替代品。本研究通过缩聚法合成了掺杂铜和银的 g-C3N4，用于 VOCs 传感应用。在室温下，所有样品对甲醇都表现出选择性响应。值得注意的是，与未掺杂 g-C3N4 传感器（~3.58）和铜/g-C3N4 传感器（~9.82）相比，Ag/g-C3N4 传感器对 200 ppm 甲醇的响应明显增强（~27.5）。基于 Ag/C3N4 的传感器显示出快速的响应（21 秒）和恢复（17 秒）时间，以及出色的短期和长期稳定性。研究发现，在陶瓷和柔性聚酰亚胺基底上沉积的 Ag/C3N4 传感器对 9 % 至 93 % RH 的湿度水平具有良好的响应，没有观察到任何明显的变化。此外，考虑到其实际应用性，Ag/C3N4 传感器成功地检测出了人体呼气中的酒精含量，突显了其在实际应用中的潜力。

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引用次数: 0

Co–Ni nanoparticle supported on heteroatom-doped carbon derived from garlic powder and eutectic solvent: Its application in Nitroarenes reduction 以大蒜粉和共晶溶剂为原料、掺杂杂原子的碳为载体的 Co-Ni 纳米粒子：在硝基烯烃还原中的应用

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2024-10-16 DOI: 10.1016/j.diamond.2024.111662

Kosar Azizi, Firouzeh Nemati, Marzie Sadat Mirhosseyni

This paper presents the synthesis of a novel heterogeneous catalyst, PSN-C600-Co2:Ni1, designed for the hydrogenation of nitroaromatic compounds. The catalyst is a porous carbon substrate triply doped with nitrogen, sulfur, and phosphorus, incorporating bimetallic Co and Ni nanoparticles. A natural precursor, garlic biochar, and a biodegradable eutectic solvent were used in the synthesis. Various characterization techniques, including Scanning Electron Microscope (SEM), X-Ray Energy Diffraction Spectroscopy (EDX), Elemental Mapping Measurements (MAP), Thermogravimetric Analysis (TGA), X-Ray Diffraction (XRD), Infrared Spectrometer (FTIR), Transmission Electron Microscope (TEM), Raman Spectroscopy, and Nitrogen Adsorption and Desorption Pattern (N₂ adsorption-desorption isotherm), were utilized to examine the features and properties of the synthesized PSN-C600-Co2:Ni1 catalyst.

本文介绍了一种新型异相催化剂 PSN-C600-Co2:Ni1的合成过程，该催化剂设计用于硝基芳香族化合物的氢化反应。该催化剂是一种氮、硫、磷三重掺杂的多孔碳基质，其中含有双金属 Co 和 Ni 纳米颗粒。合成过程中使用了天然前体大蒜生物炭和生物可降解共晶溶剂。各种表征技术包括扫描电子显微镜（SEM）、X 射线能量衍射光谱（EDX）、元素图谱测量（MAP）、热重分析（TGA）、X 射线衍射（XRD）、红外光谱仪（FTIR）、透射电子显微镜 (TEM)、拉曼光谱以及氮吸附和解吸模式（N2 吸附-解吸等温线），来研究合成的 PSN-C600-Co2：Ni1 催化剂的特征和特性。

引用次数: 0

Insights on the electrical conductivity enhancement mechanisms of carbon polymer dots (CPDs) reinforced Cu composites 碳聚合物点 (CPD) 增强铜复合材料导电性增强机制的启示

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2024-10-16 DOI: 10.1016/j.diamond.2024.111674

Yan He , Jianhong Yi , Liang Liu , Rui Bao , Mingyi Zhu , Caiju Li , Xin Kong , Yichun Liu , Xiaofeng Chen , Zunyan Xu , Ke Chu

Carbon polymer dots (CPDs) has represented unique potential in reconciling the incompatible properties of strength and electrical conductivity (EC) in copper matrix composites, while the mechanisms underlying EC improvement remain to be fully elucidated. 0.2CPDs/Cu composites prepared by conventional powder metallurgy processes achieves excellent mechanical and electrical conductivity simultaneously. Compared to pure Cu, CPDs not only participated in the construction of a better electronic transport pathway, but accelerated the twinning forming behavior, leading to outstanding strength(∼423 MPa) and electrical conductivity(95%IACS). Here the conductive behavior of CPDs/Cu composites was revealed through characterizing the intrinsic electrical properties of CPDs and composites microstructure evolution. CPDs not only participated in the construction of a better electronic transport pathway, but accelerated the twinning forming behavior. Increased twinning domain leads to the remarkable amelioration of grain boundary resistance, meanwhile, the intragranular CPDs made a significant contribution on the enhanced mechanical strength via Orowan strengthening. This work makes up the lack of understanding on the mechanical and electrical enhancement mechanism in our prior research.

碳聚合物点（CPDs）在协调铜基复合材料的强度和导电性（EC）这两个不相容的特性方面具有独特的潜力，但导电性改善的机理仍有待全面阐明。采用传统粉末冶金工艺制备的 0.2CPDs/Cu 复合材料可同时获得优异的机械性能和导电性能。与纯铜相比，CPD 不仅参与构建了更好的电子传输通路，而且加速了孪晶形成行为，从而获得了出色的强度（∼423 MPa）和导电性（95%IACS）。本文通过表征 CPDs 的内在电学特性和复合材料的微观结构演化，揭示了 CPDs/Cu 复合材料的导电行为。CPD 不仅参与构建了更好的电子传输通路，还加速了孪晶形成行为。孪晶域的增加显著改善了晶界电阻，同时，粒内 CPD 通过奥罗旺强化对提高机械强度做出了重要贡献。这项工作弥补了我们之前研究中对机械和电气增强机制认识的不足。

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引用次数: 0

Correlation of residual stress on piezoresistive properties of boron-doped diamond films 残余应力与掺硼金刚石薄膜压阻特性的相关性

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2024-10-16 DOI: 10.1016/j.diamond.2024.111677

Mingjun Deng , Xueyu Zhang , Ke Fang , Zhigang Gai , Yang Zhou , You Yang

To investigate the influence of residual stress on the piezoresistive behavior of boron-doped diamond (BDD) films, BDD films with varying doping concentrations were synthesized using a hot-filament chemical vapor deposition (HFCVD) system on silicon and diamond substrates. The relationship between the surface morphology, structural composition, resistivity, and piezoresistive properties of BDD electrodes was examined, along with an in-depth analysis of the impact of boron doping level on these properties. The microstructure and bonding state of the BDD films were characterized using scanning electron microscopy (SEM), atomic force microscopy (AFM), and Raman spectroscopy. The piezoresistive properties of the BDD films were evaluated employing a cantilever beam bending method. Our findings demonstrate that the level of boron doping not only affects resistivity but also directly influences residual stress in BDD films, both factors having an impact on their piezoresistive properties. Despite significantly larger grain sizes observed in BDD films grown on diamond substrates compared to those grown on silicon substrates at identical boron doping concentrations, they exhibit consistent variations in residual stress and gauge factor (GF) values. With increasing doping levels, the absolute residual stress decreases initially before increasing again; moreover, at 2000 ppm doping level, it transitions from compressive to tensile stress. The GF value is closely associated with both the magnitude and type of residual stress. By utilizing a doping concentration of 2000 ppm for growth on diamond substrates, we achieved a peak GF value of 257 for BDD films which highlights their promising potential for pressure sensor applications.

为了研究残余应力对掺硼金刚石（BDD）薄膜压阻行为的影响，我们使用热丝化学气相沉积（HFCVD）系统在硅和金刚石基底上合成了不同掺杂浓度的 BDD 薄膜。研究了 BDD 电极的表面形貌、结构组成、电阻率和压阻特性之间的关系，并深入分析了硼掺杂水平对这些特性的影响。使用扫描电子显微镜（SEM）、原子力显微镜（AFM）和拉曼光谱对 BDD 薄膜的微观结构和键合状态进行了表征。采用悬臂梁弯曲法评估了 BDD 薄膜的压阻特性。我们的研究结果表明，硼掺杂水平不仅会影响电阻率，还会直接影响 BDD 薄膜中的残余应力，这两个因素都会对其压阻特性产生影响。尽管在相同的硼掺杂浓度下，在金刚石衬底上生长的 BDD 薄膜与在硅衬底上生长的 BDD 薄膜相比，晶粒尺寸明显更大，但它们在残余应力和规整因子 (GF) 值方面却表现出一致的变化。随着掺杂水平的增加，绝对残余应力最初会减小，然后再增大；此外，当掺杂水平达到 2000 ppm 时，残余应力会从压应力过渡到拉应力。GF 值与残余应力的大小和类型密切相关。利用 2000 ppm 的掺杂浓度在金刚石基底上生长，我们获得了 257 的 BDD 薄膜峰值 GF 值，凸显了其在压力传感器应用中的巨大潜力。

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引用次数: 0

Biomass-based three-dimensional network porous carbon anodes derived from discontinuous activation for high performance Li-ion batteries 基于生物质的三维网络多孔碳阳极，源自用于高性能锂离子电池的非连续活化技术

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2024-10-16 DOI: 10.1016/j.diamond.2024.111676

Rui Ding , Litao Chen , Na Li , Qihua Zhou , Xianwen Zhang

An approach of discontinuous activation and frozon-dry pretreatment toward a three-dimensional network porous carbon was proposed by using apple as the carbon source. The porous carbon, characterized by its high surface area and abundant porosity, was optimized through the manipulation of temperature and activator quantities during the activation process. The sample obtained by first calcining at 500 °C and then at 800 °C shows ultra-high rate electrochemical performance of over 900 mA h g⁻¹ after 100 cycles and over 500 mA h g⁻¹ after 500 cycles under the condition of charging and discharging current density of 0.2 A g⁻¹ due to the high porosity. It is ascribed to the unique porous structure that can make the electrolyte and lithium ion transport and path short on the surface and inside the electrode material, further enhance its fast transport ability. The described approach represents an innovative and potentially impactful method for producing porous carbon electrodes with excellent electrochemical performance, particularly in the context of high-rate capability lithium-ion batteries.

该研究以苹果为碳源，提出了一种非连续活化和冻干预处理的方法，以获得三维网络多孔碳。在活化过程中，通过调节温度和活化剂的用量，优化了以高比表面积和丰富的孔隙率为特征的多孔碳。在充放电电流密度为 0.2 A g-1 的条件下，先在 500 °C 煅烧、再在 800 °C 煅烧得到的样品由于孔隙率高，在循环 100 次后显示出超过 900 mA h g-1 的超高速率电化学性能，在循环 500 次后显示出超过 500 mA h g-1 的超高速率电化学性能。这要归功于独特的多孔结构，它可以使电极材料表面和内部的电解质和锂离子传输和路径变短，进一步提高其快速传输能力。所述方法是生产具有优异电化学性能的多孔碳电极的一种创新且具有潜在影响的方法，尤其适用于高倍率锂离子电池。

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引用次数: 0

Facile synthesis of transition metal-selenides@CNTs for electrochemical oxygen evolution reactions 用于电化学氧进化反应的过渡金属硒化物@CNT的简便合成

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2024-10-15 DOI: 10.1016/j.diamond.2024.111655

Shamas Riaz , Muhammad Ahmad , Syed Salman Shafqat , Munawar Iqbal , Gul Tasam , Maryam Kaleem , Syed Rizwan Shafqat , Habib Elhouichet , Mongi Amami , Abid Ali

The fabrication of carbon-based efficient electrocatalysts for hydrogen production during electrochemical water splitting could be a great achievement to fulfill the future renewable energy demand. In this study, one-step hydrothermal process was used to develop composites of multi-metal selenides with carbon nanotubes (MnSe@CNTs, MnCuSe@CNTs, MnCoNiSe@CNTs) as electrocatalysts for OER during electrolytic water splitting. XRD and SEM with EDS analysis confirm the successful fabrication of the proposed catalyst and its crystalline morphology. Among the synthesized functionalized CNTs composites, bimetallic selenide composite gives a better electrocatalytic activity with reduced overpotential, lower Tafel slope and reduced charge transfer resistance in 1 M KOH. By using the catalyst(MnCuSe@CNTs) water oxidation starts at 1.4 V onset potential with a very low overpotential of 245 mV and the Tafel slope was only 107 mV dec⁻¹. Metal-based selenides composites with CNTs introduce a lot of active sites, and subsequently nanoparticles of MnSe, MnCuSe, & MnCoNiSe, causes to boost the surface area and electrocatalysis toward oxygen evolution reactions.

制备碳基高效电催化剂用于电化学分水制氢是满足未来可再生能源需求的一项重大成就。本研究采用一步水热法制备了多金属硒化物与碳纳米管的复合材料（MnSe@CNTs、MnCuSe@CNTs、MnCoNiSe@CNTs），作为电解水分离过程中 OER 的电催化剂。XRD 和带有 EDS 的 SEM 分析证实了所提议的催化剂的成功制备及其结晶形态。在合成的功能化碳纳米管复合材料中，双金属硒化物复合材料具有更好的电催化活性，在 1 M KOH 中具有更低的过电位、更低的塔菲尔斜率和更低的电荷转移电阻。通过使用催化剂（MnCuSe@CNTs），水氧化在 1.4 V 的起始电位开始，过电位非常低，仅为 245 mV，塔菲尔斜率仅为 107 mV dec-1。金属基硒化物与 CNT 的复合引入了大量活性位点，随后 MnSe、MnCuSe、& MnCoNiSe 的纳米颗粒增加了比表面积，提高了对氧进化反应的电催化能力。

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引用次数: 0