Diamond and Related Materials最新文献_第8页

Two types of stimulated emission in HPHT diamond with a high concentration of NV centers 具有高浓度 NV 中心的 HPHT 金刚石中的两种受激发射类型

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

Diamond and Related Materials

Pub Date : 2024-11-09 DOI: 10.1016/j.diamond.2024.111763

V.F. Lebedev , E.A. Vasilev , I.V. Klepikov , T.S. Misnikova , Ya.A. Ryvkina , A.V. Koliadin , V.G. Vins

The paper presents the results of experimental observation of two types of stimulated emission (SE) under pulsed laser pumping at 532 nm in diamond with NV centers. A comprehensive spectroscopic characterization of multisectorial HPHT diamond plate was performed. At low pumping power, the stimulated emission from NV¯ centers was recorded as a broad (≥80 nm wide) band with a maximum at 706 nm in the {111} and {311} sectors of the diamond plate. As the pump power increased in the {111} sector, narrow-band stimulated emission (<10 nm wide) was detected, with a maximum at 716 nm and a luminescence impulse duration of 1.5–3 ns. As the pump density increased, a fine structure in the spectrum of narrow-band stimulated emission was revealed for the first time. The concentration of NV¯ centers in the {111} and {311} growth sectors was ≈10 ppm. However, there were considerable differences in the concentrations of C (35 and 3.5 ppm) and C⁺ centers (6.1 and 3.2 ppm, respectively). It was demonstrated that the presence of a high concentration of NV¯ centers is not the only necessary condition for the initiation of narrow-band SE in the 710–720 nm range. In the {311} sector, lighting at 360, 405, and 488 nm reduced the concentration of NV¯ centers by 15 % while increasing the concentration of C⁺ centers in the {311} sector. This effect is weak in the {111} sector. The authors suggested a model for narrow-band SE at the transition Valence Band → C⁺ with charge-state conversion of C↔C⁺ and NV⁰↔NV¯ centers. Further research on the dynamic processes is required in order to a detailed understanding of the operation of NV centers in diamond during SE generation.

本文介绍了在 532 纳米脉冲激光泵浦下，带 NV 中心的金刚石中两种受激发射（SE）的实验观察结果。对多扇面 HPHT 金刚石板进行了全面的光谱表征。在低泵浦功率下，NV¯中心的受激发射在金刚石板的{111}和{311}扇区被记录为一个宽带（≥80 nm 宽），最大波长为 706 nm。随着{111}扇区泵浦功率的增加，检测到窄带受激发射（宽 10 nm），最大值在 716 nm，发光脉冲持续时间为 1.5-3 ns。随着泵浦密度的增加，窄带受激发射光谱中的精细结构首次被揭示出来。{111}和{311}生长区的 NV¯ 中心浓度≈10 ppm。然而，C（35 ppm 和 3.5 ppm）和 C+ 中心（分别为 6.1 ppm 和 3.2 ppm）的浓度存在很大差异。研究表明，高浓度 NV¯ 中心的存在并不是在 710-720 nm 范围内引发窄带 SE 的唯一必要条件。在{311}扇形区，360、405 和 488 纳米波长的光照使 NV¯ 中心的浓度降低了 15%，同时增加了{311}扇形区的 C+ 中心浓度。这种效应在{111}扇区很弱。作者提出了一个窄带 SE 模型，即在价带 → C+ 转换时，C↔C+ 和 NV0↔NV¯ 中心的电荷状态转换。为了详细了解金刚石中 NV 中心在 SE 生成过程中的运行情况，还需要对动态过程进行进一步的研究。

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引用次数: 0

Hydrothermal synthesis of rGO-decorated NiMn2O4 nanoneedles for high-performance positive electrode in asymmetric supercapacitors 用于不对称超级电容器中高性能正极的 rGO 装饰镍锰氧化物纳米针的水热合成

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

Diamond and Related Materials

Pub Date : 2024-11-09 DOI: 10.1016/j.diamond.2024.111764

J. Jothi , M. Parthibavarman , K.L. Meghanathan , Basma Souayeh , Mir Waqas Alam , Shima Sadaf

Pseudocapacitive electrode materials inherently have low electron conductivity, which prevents an energetic material from being fully utilised. We were able to produce effective hierarchical NiMn₂O₄/rGO composites, which provide an appealing solution to this issue. The composites were synthesised using a one-step hydrothermal approach. Due to the high electrical conductivity of reduced graphene oxide (rGO), the needles on plate like morphology of NiMn₂O₄, and the strong hold of dynamic materials to the current collector, the resulting hybrid electrodes exhibit a specific capacitance of 1628 Fg⁻¹ at a current density of 1 Ag⁻¹. They also demonstrate excellent rate performance and remarkable cycling stability, with a capacitance retention of 97.4 % after 10,000 cycles. In addition, the NiMn₂O₄/rGO//AC asymmetric supercapacitor (ASC) exhibits a peak energy density of 45Whkg⁻¹ when operated at a power density of 3240 Wkg⁻¹. The ASC device has an impressive ultralong cycling life, with a capacitance retention rate of 89.1 % after undergoing 10,000 charge/discharge cycles. The NiMn₂O₄/rGO composites provide a scalable production method and demonstrate outstanding electrochemical performance. This presents an opportunity to create innovative hybrid electrodes for enhanced supercapacitors.

伪电容电极材料本身具有较低的电子传导性，因此无法充分利用高能材料。我们能够生产出有效的分层镍锰氧化物/rGO 复合材料，为解决这一问题提供了一个极具吸引力的方案。我们采用一步水热法合成了这种复合材料。由于还原氧化石墨烯（rGO）的高导电性、镍锰氧化物的针状板状形貌以及动态材料对集流器的强力固定，在电流密度为 1 Ag-1 时，所产生的混合电极显示出 1628 Fg-1 的比电容。它们还表现出卓越的速率性能和出色的循环稳定性，在循环 10,000 次后，电容保持率达到 97.4%。此外，NiMn2O4/rGO//AC 非对称超级电容器（ASC）在功率密度为 3240 Wkg-1 的条件下工作时，峰值能量密度为 45Whkg-1。ASC 器件的超长循环寿命令人印象深刻，在经历 10,000 次充电/放电循环后，电容保持率高达 89.1%。NiMn2O4/rGO 复合材料提供了一种可扩展的生产方法，并展示了出色的电化学性能。这为创造用于增强型超级电容器的创新型混合电极提供了机会。

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引用次数: 0

Diamond parameter design and assessment of a novel 3D printed diamond grinding wheel with linear cooling channels 带有线性冷却通道的新型 3D 打印金刚石砂轮的金刚石参数设计与评估

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

Diamond and Related Materials

Pub Date : 2024-11-09 DOI: 10.1016/j.diamond.2024.111760

Jingjing Wu , Qian Zhang , Yinfeng Li , Shaohe Zhang , Xiangwang Kong , Linglong Rong , Yutong Xiao , Hongzhi Li , Zhuofan Ding

To solve the problems of a metal-bonded diamond grinding wheel in grinding hard and brittle material parts, such as easy blockage, poor cooling capacity, and insufficient self-sharpening, a 3D printed diamond grinding wheel with linear cooling channels (GWLCC) was proposed, and its basic parameters were analyzed in this paper. The new grinding wheels with different diamond parameters were prepared by using dual-filament 3D printing technology. The hardness and relative density of the grinding wheels were measured, and the grinding tests of red sandstone were carried out. The experimental results show that high volume concentration and fine granularity of diamond particles are more likely to cause agglomeration behavior, resulting in more pores and cracks, thus reducing the relative density of the grinding wheel and matrix strength, but this is conducive to the exposure of diamond particles. The grinding efficiency of the diamond grinding wheel is positively correlated with the volume concentration and grain size of the diamond. Besides, a test of the grinding performance of GWLCC with different diamond parameters in grinding different brittle-hard materials was carried out, and the suitability of the new 3D printed grinding wheel and its potential to improve grinding performance has been proven. The GWLCC suitable for different hard and brittle materials are summarized.

为解决金属结合剂金刚石砂轮在磨削硬脆材料零件时易堵塞、冷却能力差、自锐性不足等问题，本文提出了一种带线性冷却通道的3D打印金刚石砂轮（GWLCC），并对其基本参数进行了分析。采用双丝 3D 打印技术制备了不同金刚石参数的新型砂轮。测量了砂轮的硬度和相对密度，并对红砂岩进行了磨削试验。实验结果表明，高体积浓度和细颗粒度的金刚石颗粒更容易引起团聚行为，导致更多的孔隙和裂缝，从而降低砂轮的相对密度和基体强度，但这有利于金刚石颗粒的暴露。金刚石砂轮的磨削效率与金刚石的体积浓度和粒度呈正相关。此外，还对不同金刚石参数的 GWLCC 在磨削不同脆硬材料时的磨削性能进行了测试，证明了新型 3D 打印砂轮的适用性及其提高磨削性能的潜力。总结了适用于不同硬脆材料的 GWLCC。

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引用次数: 0

High-performance flexible CoFe2O4/N-doped carbon nanofiber composite anode materials for sodium-ion batteries 用于钠离子电池的高性能柔性 CoFe2O4/N 掺杂碳纳米纤维复合负极材料

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

Diamond and Related Materials

Pub Date : 2024-11-08 DOI: 10.1016/j.diamond.2024.111730

Yan Ren , Qi Li , Qi Liu , Wenquan Jiang , Hengrui Qiu , Yongqiang Zhang , Wenxiu He

Graphite is traditionally used as an anode material but is unsuitable for use in sodium-ion batteries because it has a low specific capacity and poor safety characteristics, it is therefore necessary to develop alternative anode materials. Flexible CoFe₂O₄ nanoparticle/N-doped carbon nanofiber films were prepared by electrospinning and calcination. The advantages of this process included inexpensive starting materials, easy preparation, and suitability for commercialization. The inherent shortcomings of CoFe₂O₄, such as poor electronic conductivity and large changes in volume, were mitigated via elemental doping and the formation of composites with high-quality carbon materials. Nitrogen-doped carbon nanofibers with large specific surface areas and superior mechanical properties were used as the supporting skeleton of the material. These nanofibers limited the volume expansion of CoFe₂O₄ throughout the cycling process and increased the ion diffusion velocity in the material. The optimal integration of nanoscale CoFe₂O₄ particles, which possess a higher theoretical specific capacity, with a nitrogen-doped carbon nanofiber conductive framework featuring a crosslinked three-dimensional structure facilitated the infiltration of the electrolyte into the electrode. This integration reduced the diffusion distance of sodium ions and effectively reduced the volume expansion of the material, as well as damage to the material during the electrochemical reaction. After 200 cycles at a current density of 0.1 A g⁻¹, it provided a high sodium storage capacity of 365.7 mA h g⁻¹. The capacity was maintained at 176.3 mA h g⁻¹ even at a high current density of 2 A g⁻¹. Exhibits good cycle stability.

石墨是传统的负极材料，但由于其比容量低、安全性差，不适合用于钠离子电池，因此有必要开发替代负极材料。通过电纺丝和煅烧制备了柔性 CoFe2O4 纳米粒子/N 掺杂碳纳米纤维薄膜。这种工艺的优点包括起始材料价格低廉、制备简单、适合商业化。CoFe2O4 固有的缺点，如电子导电性差和体积变化大，通过元素掺杂和与高质量碳材料形成复合材料得到了缓解。掺氮碳纳米纤维具有较大的比表面积和优异的机械性能，被用作材料的支撑骨架。这些纳米纤维限制了 CoFe2O4 在整个循环过程中的体积膨胀，并提高了材料中的离子扩散速度。具有较高理论比容量的纳米级 CoFe2O4 颗粒与掺氮碳纳米纤维导电骨架的最佳结合具有交联的三维结构，有利于电解质渗入电极。这种整合减少了钠离子的扩散距离，有效降低了材料的体积膨胀，并减少了电化学反应过程中对材料的损坏。在 0.1 A g-1 的电流密度下循环 200 次后，它的钠存储容量高达 365.7 mA h g-1。即使在 2 A g-1 的高电流密度下，容量也能保持在 176.3 mA h g-1。具有良好的循环稳定性。

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引用次数: 0

Precisely tuning ε′-negative and ε′-near-zero responses by synergistic effect of graphene and carbon black in ternary metacomposites 通过三元元复合材料中石墨烯和炭黑的协同效应精确调节ε′负响应和ε′近零响应

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

Diamond and Related Materials

Pub Date : 2024-11-07 DOI: 10.1016/j.diamond.2024.111758

Xinxue Tang , Ye Wu , Jie Li , Shichang Liu , Junxiong Zhang , Jun Cao , Baihui Ma , Yunpeng Qu

Understanding how to precisely regulate the magnitude and dispersion characteristics of radio-frequency (RF) ε’-negative and ε’-near-zero (ENZ) responses presents a challenge. This challenge significantly impacts the design of versatile electronic devices. In this study, we introduce a synergistic strategy utilizing graphene (GR) and carbon black (CB) in ternary metacomposites for tunable ε’-negative and ENZ responses. Due to the randomly constructed 3-dimensional (3D) conductive GR-CB networks in a CaCu₃Ti₄O₁₂ matrix, we observed two types of ε’-negative response mechanisms: electric dipole resonance and low-frequency plasma oscillation, which dominate at different frequency bands. Consequently, the weakly ε’-negative values (0 < |ε’| 〈1000) and frequency dispersion were successfully adjusted due to the interplay between these two mechanisms. The ENZ frequencies were also tuned over ∼580 MHz, 225 MHz, ∼189 MHz and ∼ 188 MHz with variable GR-to-CB ratios. Furthermore, we studied the conduction behavior, loss mechanism, and electrical characteristics of the ε’-negative metacomposites to shed light on the relationship between microstructural changes and dielectric performance.

如何精确调节射频（RF）ε'-负和ε'-近零（ENZ）响应的幅度和色散特性是一项挑战。这一挑战极大地影响了多功能电子设备的设计。在本研究中，我们介绍了一种在三元元复合材料中利用石墨烯（GR）和炭黑（CB）实现可调ε'-负响应和ENZ响应的协同策略。由于在 CaCu3Ti4O12 基体中随机构建了三维（3D）导电石墨烯-炭黑网络，我们观察到了两种类型的ε'-负响应机制：电偶极子共振和低频等离子振荡，它们在不同的频段占主导地位。因此，由于这两种机制之间的相互作用，弱ε'-负值（0 < |ε'| 〈1000）和频率弥散得到了成功的调整。我们还在 580 MHz、225 MHz、189 MHz 和 188 MHz 的范围内调整了 ENZ 频率，并改变了 GR 与 CB 的比率。此外，我们还研究了ε'-负元复合材料的传导行为、损耗机制和电气特性，以揭示微结构变化与介电性能之间的关系。

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引用次数: 0

In situ synthesis of Cu(OH)2 and carbon nanotube electrodes: A promising approach for high-performance one-dimensional flexible supercapacitors Cu(OH)2 和碳纳米管电极的原位合成：有望实现高性能一维柔性超级电容器的方法

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

Diamond and Related Materials

Pub Date : 2024-11-07 DOI: 10.1016/j.diamond.2024.111732

Qian Zhang , Hongbiao Li , Yaqi Xu , Xiaozheng Su , Jianhua Yu , Jing Sui , Liyan Yu , Lifeng Dong

Amidst the rapid surge in electrical device utilization, there is an urgent need for advanced power supply solutions. Flexible supercapacitors, renowned for their remarkable electrochemical properties, emerge as a promising remedy. This study employs in situ techniques on copper wire (CW) to obtain active materials for both the electrodes. The positive CW@Cu(OH)₂ electrode, synthesized through vapor-phase reaction between CW and NH₃·H₂O, yields copper hydroxide (Cu(OH)₂) nanosheets via an alkali-assisted oxidation process. Comparative analysis of CW@Cu(OH)₂ electrodes under varying reaction conditions revealed that the Cu(OH)₂ nanosheets, characterized by their small size and high distribution density on CW, significantly enhance electrochemical performance. The optimized CW@Cu(OH)₂ electrode achieved a specific capacitance of 195.7 mF cm⁻². This in situ growth method effectively prevents active material detachment, resulting in electrodes with minimal internal resistance. Carbon nanotubes (CNTs), also synthesized in situ via chemical vapor deposition on CW, serve as the active materials for the negative electrode. Assembled in parallel, the flexible supercapacitor, CW@Cu(OH)₂//KOH-PVA//CW@CNTs, achieves a specific capacitance of 1.59 F cm⁻³ at a current density of 0.1 A cm⁻³, with an energy density of 0.496 mWh cm⁻³ at a power density of 15 mW cm⁻³. Demonstrating robust capacitance retention across varying current densities and diverse bending angles, this supercapacitor signifies a versatile and stable power storage solution.

随着电气设备使用率的快速增长，人们迫切需要先进的电源解决方案。柔性超级电容器以其卓越的电化学特性而闻名，是一种前景广阔的解决方案。本研究利用铜线（CW）原位技术获得了两个电极的活性材料。正极 CW@Cu(OH)2 电极是通过 CW 和 NH3-H2O 的气相反应合成的，通过碱辅助氧化过程生成氢氧化铜（Cu(OH)2）纳米片。在不同反应条件下对 CW@Cu(OH)2 电极进行的比较分析表明，Cu(OH)2 纳米片的特点是尺寸小、在 CW 上的分布密度高，能显著提高电化学性能。优化后的 CW@Cu(OH)2 电极的比电容达到了 195.7 mF cm-2。这种原位生长方法可有效防止活性材料脱落，从而使电极的内阻最小。碳纳米管（CNT）也是通过化学气相沉积在 CW 上原位合成的，用作负极的活性材料。并联组装的柔性超级电容器（CW@Cu(OH)2//KOH-PVA//CW@CNTs）在电流密度为 0.1 A cm-3 时的比电容为 1.59 F cm-3，在功率密度为 15 mW cm-3 时的能量密度为 0.496 mWh cm-3。这种超级电容器在不同的电流密度和不同的弯曲角度下都能保持稳定的电容，是一种多功能、稳定的电力存储解决方案。

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引用次数: 0

Fe3O4 nanoparticles decorated on N-doped graphene oxide nanosheets for elimination of heavy metals from industrial wastewater and desulfurization 装饰在掺杂 N 的氧化石墨烯纳米片上的 Fe3O4 纳米颗粒用于消除工业废水中的重金属并脱硫

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

Diamond and Related Materials

Pub Date : 2024-11-06 DOI: 10.1016/j.diamond.2024.111746

Kashinath Lellala , Subhendu Kumar Behera , Prarthana Srivastava , Waseem Sharaf Saeed , Ahmed S. Haidyrah , Ajay N. Burile

Finding an effective and excellent pertinent single catalyst material for multipurpose application for the purification of hydrocarbons in fuels (desulfurization), and for efficient removal of heavy metals from industrial effluent is greatly endowed. In the present work, a hybrid nanocomposite of ultrafine magnetite (Fe₃O₄) nanoparticle embedded on the surface of in-situ nitrogen doped layered GO (NGO) sheets were fabricated by sol-gel method and treatment with microwave irradiation technique is reported for the first time. The results show a high removal efficiency of 97 % for multiple heavy metals (Pb²⁺, Cd²⁺, Cu²⁺, Cr⁺², Mn⁺² etc.) in industrial effluent and as well as in synthetic water with a very good retention performance of 99 %. The composites were tested against the elimination of sulfur from thiophene is 1.495 mmol g⁻¹ is reported high is due to coupling and coordination of nitrogen with FeO and C. Recycling studies showed that the developed composites had excellent recyclability, with <82 % removal at the 5th cycle; its feasibility was evaluated using industrial effluent water and in synthetic water. Surface phenomena studies presented here revealed that the adsorptive removal processes of heavy metals involved π electron donor-acceptor interactions, ion exchange, and electrostatic interactions, along with surface complexation that showed an excellent synergism. A high stability, and retention performance is better than the pure Fe₃O₄ and NGO sheets. We hope that this study will motivate and give further scope for scientists working on magnetite-based graphene nanocomposites.

为燃料中碳氢化合物的净化（脱硫）和工业废水中重金属的高效去除寻找一种有效、优良的多用途相关单一催化剂材料是一项艰巨的任务。本研究首次报道了通过溶胶-凝胶法在原位氮掺杂层状 GO（NGO）薄片表面嵌入超细磁铁矿（Fe3O4）纳米粒子并用微波辐照技术处理的混合纳米复合材料。研究结果表明，该复合材料对工业废水和合成水中的多种重金属（Pb2+、Cd2+、Cu2+、Cr+2、Mn+2 等）的去除率高达 97%，且保留率高达 99%。回收研究表明，所开发的复合材料具有极佳的可回收性，在第 5 个循环中的去除率为 82%；使用工业废水和合成水对其可行性进行了评估。本文介绍的表面现象研究表明，重金属的吸附去除过程涉及π电子供体-受体相互作用、离子交换、静电作用以及表面络合作用，这些作用表现出极佳的协同效应。其稳定性和保留性能均优于纯 Fe3O4 和 NGO 片材。我们希望这项研究能激励科学家们进一步研究磁铁矿基石墨烯纳米复合材料。

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引用次数: 0

Understanding the tribo-corrosion behaviors and mechanism of Si/N-DLC films in marine environment 了解 Si/N-DLC 薄膜在海洋环境中的三重腐蚀行为和机理

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

Diamond and Related Materials

Pub Date : 2024-11-06 DOI: 10.1016/j.diamond.2024.111756

Xubing Wei , Zan Chen , Haiyan Feng , Zhengyu Liu , Shiqi Lu , Jiaqing Ding , Naizhou Du , Pingmei Yin , Weibo Yang , Xiaowei Li , Guangan Zhang

Herein, a series of Si/N-DLC films were deposited by modulating the flow rate of the N₂ precursor, with the aim of elucidating their tribo-corrosion behaviors and underlying mechanisms in a marine environment. The results indicate that the deposited Si/N-DLC films significantly enhance the substrate's resistance to tribo-corrosion in seawater. This improvement initially increases and then decreases, a trend attributed to the toughness of the film. The fundamental tribo-corrosion mechanism involves a solid-liquid composite lubrication composed of Si/N-DLC film and seawater, and it is dependent on the adequacy of liquid-phase lubrication, the graphitization degree at the friction interface, and the film toughness. This process is coupled with the blockage of corrosion pathways due to the diffusion of corrosion products, the formation of tribo-chemical products, and the generation of wear debris.

本文通过调节 N2 前驱体的流速沉积了一系列 Si/N-DLC 薄膜，旨在阐明它们在海洋环境中的三重腐蚀行为及其内在机理。结果表明，沉积的 Si/N-DLC 薄膜显著增强了基底在海水中的抗三腐蚀能力。这种提高最初是先增加后减小，这种趋势归因于薄膜的韧性。三重腐蚀的基本机理涉及由 Si/N-DLC 薄膜和海水组成的固液复合润滑，它取决于液相润滑的充分性、摩擦界面的石墨化程度以及薄膜的韧性。在这一过程中，由于腐蚀产物的扩散、三化学产物的形成以及磨损碎片的产生，腐蚀通道被堵塞。

引用次数: 0

Preparation and investigation of physicochemical properties of g-C3N4/LaCoO3 heterostructure for photocatalytic dye degradation 用于光催化降解染料的 g-C3N4/LaCoO3 异质结构的制备与理化性质研究

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

Diamond and Related Materials

Pub Date : 2024-11-06 DOI: 10.1016/j.diamond.2024.111747

R. Punniyamoorthy , S. Sridhar , E. Ranjith Kumar , A. Kalaivani , Annamalai Raja , Misook Kang , A.F. Abd EI-Rehim

Photocatalytic decomposition of pollutant is the most optimal approach for the wastewater remediation. Nevertheless, the development of a catalyst that is both cost-effective and extraordinarily active remains a substantial challenge. The g-C₃N₄/LaCoO₃ heterostructure were prepared by different weight percentages of g-C3N₄ (15, 30, 45, 60, and 75 wt%). The g-C₃N₄ and LaCoO₃ were exhibits hexagonal and rhombohedral crystal structure respectively. The g-C₃N₄/LaCoO₃ heterostructure exhibits tiny particles were anchored over the coarse like structure. The g-C₃N₄/LaCoO₃ heterostructure promote visible light harvest and inhibit charge carrier recombination than the bare LaCoO₃ and g-C₃N₄ and which helps to enhance the organic pollutant elimination performances. The g-C₃N₄/LaCoO₃ heterojunction exhibits superior methylene blue degradation when compared to bare LaCoO₃ and g-C₃N₄. Furthermore, the composite of LaCoO₃/g-C₃N₄–60 wt% exhibits higher photocatalytic activity and exceptional stability were observed under visible light irradiation.

光催化分解污染物是修复废水的最佳方法。然而，开发一种既经济又具有超强活性的催化剂仍然是一项巨大的挑战。g-C3N4/LaCoO3 异质结构的制备采用了不同重量百分比的 g-CN4（15、30、45、60 和 75 wt%）。g-C3N4 和 LaCoO3 分别呈现六方和斜方晶体结构。g-C3N4/LaCoO3 异质结构显示出微小的颗粒锚定在粗糙的类似结构上。与裸 LaCoO3 和 g-C3N4 相比，g-C3N4/LaCoO3 异质结构能促进可见光的收集并抑制电荷载流子的重组，从而有助于提高消除有机污染物的性能。与裸 LaCoO3 和 g-C3N4 相比，g-CN4/LaCoO3 异质结表现出更优越的亚甲基蓝降解性能。此外，在可见光照射下，LaCoO3/g-C3N4-60 wt% 的复合材料表现出更高的光催化活性和优异的稳定性。

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引用次数: 0

Hydrothermal synthesis of CeSe anchored on graphitic carbon nitride nanoclusters as an electrocatalyst for enhanced oxygen evolution reaction 水热法合成锚定在氮化石墨碳纳米团簇上的 CeSe 作为增强氧进化反应的电催化剂

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

Diamond and Related Materials

Pub Date : 2024-11-06 DOI: 10.1016/j.diamond.2024.111751

Mohammad Numair Ansari , Karam Jabbour , Khadija Bibi , Mehar un Nisa , Muhammad Yousaf Ur Rehman , Alanoud T. Alfagham , Abdallah M. Elgorban , Muhammad Fahad Ehsan

The oxygen evolution reaction (OER) is a critical half-reaction in the process of water splitting, yet its practical application is hindered by slow kinetics and the high cost of conventional electrocatalysts. This study explores the potential of a novel CeSe/g-C₃N₄ nanocomposite as an efficient catalyst for OER in an alkaline environment. The CeSe/g-C₃N₄ nanocomposite exhibits exceptional electrocatalytic performance, demonstrated by a low overpotential of 196 mV at a current density of 10 mA cm⁻² and a reduced onset potential of 1.29 V versus the reversible hydrogen electrode (RHE). Additionally, nanocomposite's Tafel slope of 58.14 mV/dec is significantly lower compared to pure CeSe (76.89 mV/dec) and multi-layered g-C3N4 (89.76 mV/dec), indicating superior kinetic behavior. Remarkably, the CeSe/g-C₃N₄ composite also demonstrates excellent electrochemical stability, maintaining its performance over a 40-hour period. These findings suggest that the CeSe/g-C₃N₄ nanocomposite not only enhances the electrocatalytic properties necessary for OER but also holds the potential to outperform traditional noble metal-based catalysts, paving the way for more cost-effective and efficient water-splitting technologies.

氧进化反应（OER）是水分裂过程中的一个关键半反应，但其实际应用却受到传统电催化剂动力学缓慢和成本高昂的阻碍。本研究探讨了新型 CeSe/g-C3N4 纳米复合材料作为碱性环境中 OER 高效催化剂的潜力。CeSe/g-C3N4 纳米复合材料表现出卓越的电催化性能，在电流密度为 10 mA cm-2 时，过电位低至 196 mV，与可逆氢电极（RHE）相比，起始电位降低至 1.29 V。此外，与纯 CeSe（76.89 mV/dec）和多层 g-C3N4 （89.76 mV/dec）相比，纳米复合材料的 58.14 mV/dec 塔菲尔斜率明显降低，这表明其动力学行为更优越。值得注意的是，CeSe/g-C3N4 复合材料还表现出卓越的电化学稳定性，可在 40 小时内保持其性能。这些研究结果表明，CeSe/g-C3N4 纳米复合材料不仅增强了 OER 所需的电催化性能，还具有超越传统贵金属催化剂的潜力，为开发更具成本效益和更高效的水分离技术铺平了道路。

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