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High-performance electrocatalyst for PEMFC cathode: Combination of ultra-small platinum nanoparticles and N-doped carbon support 用于 PEMFC 阴极的高性能电催化剂:超小型铂纳米颗粒与掺杂 N 的碳载体的结合
IF 3.1 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-07-24 DOI: 10.1016/j.cartre.2024.100383
Kirill Paperzh , Yulia Bayan , Evgeny Gerasimov , Ilya Pankov , Alexey Konstantinov , Vladislav Menshchikov , Dmitry Mauer , Yegor Beskopylny , Anastasia Alekseenko

To accelerate the implementation of zero-emission power installations based on proton-exchange membrane fuel cells, it is necessary to maximize the power characteristics of these devices. For this purpose, we have obtained and tested a new N-doped carbon support and a synthesized Pt/C catalyst based on it with a platinum loading of about 37.3 %. A comparison of the degradation resistance of the initial support and the N-doped one has shown greater stability of the latter. At the same time, Raman spectroscopy has confirmed the presence of the C–N bond, which indicates the successful doping of carbon with nitrogen. The resulting Pt/C catalyst based on an N-doped support is characterized by a substantially narrow size dispersion and an ultra-small nanoparticle size of about 2.6 nm. The high-angle annular dark-field scanning transmission electron microscopy images of the synthesized catalyst have confirmed the presence of individual platinum atoms/clusters uniformly distributed over the surface of the support, and their presence is due to nitrogen embedded into the carbon structure. This material is characterized by a 50 m2 gPt-1 larger electrochemically active surface area and a 227 A gPt-1 greater mass activity compared to the commercial JM40 analog (40 % platinum loading). Meanwhile, the electrochemical parameters remaining after the accelerated stress testing are almost 2 times higher than those of JM40. And the power characteristics in the membrane electrode assembly for the catalyst synthesized by the facile one-pot synthesis method are 13 % (575 mW cm-2) higher than those of the commercial analog (500 mW cm-2). The Pt/C catalyst obtained during the research is deemed promising for commercial use in proton-exchange membrane fuel cells.

为了加快实施基于质子交换膜燃料电池的零排放发电装置,有必要最大限度地提高这些装置的功率特性。为此,我们获得并测试了一种新的掺杂 N 的碳载体,以及在此基础上合成的铂/铂催化剂,其铂载量约为 37.3%。对初始载体和掺杂 N 的载体的抗降解性进行比较后发现,后者具有更高的稳定性。同时,拉曼光谱证实了 C-N 键的存在,这表明碳中成功掺入了氮。基于氮掺杂载体的 Pt/C 催化剂具有粒度分布窄、超小型纳米颗粒(约 2.6 纳米)的特点。合成催化剂的高角度环形暗场扫描透射电子显微镜图像证实,单个铂原子/铂簇均匀地分布在载体表面,它们的存在是由于氮嵌入碳结构所致。与商用 JM40 类似物(铂含量为 40%)相比,这种材料的电化学活性表面积增加了 50 平方米 gPt-1,质量活性增加了 227 A gPt-1。同时,加速应力测试后的剩余电化学参数几乎是 JM40 的 2 倍。而且,用简单的一锅合成法合成的催化剂在膜电极组件中的功率特性(575 mW cm-2)比商用类似物(500 mW cm-2)高出 13%。研究中获得的 Pt/C 催化剂有望在质子交换膜燃料电池中投入商业使用。
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引用次数: 0
Effect of carbonization methods on graphitization of soft and hard carbons 碳化方法对软碳和硬碳石墨化的影响
IF 3.1 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-07-23 DOI: 10.1016/j.cartre.2024.100382
Sandra Ike , Randy Vander Wal

Pressurized carbonization is known to improve carbon content and create textural changes in resultant carbon compared to conventional (atmospheric) carbonization. However, further studies investigating the impact of these carbonization methods on the graphitic quality of the carbon precursors have not been explored extensively. This study investigates the influence of carbonization methods on the graphitization behavior of soft and hard carbons using a three-model system: phenolic resole (hard carbon), polyvinyl chloride (PVC) (soft carbon), and a 50:50 blend of resole and PVC. Carbonization was conducted under autogenic pressure (AGP) and atmospheric pressure (APP) at 500 °C for 5 h, followed by high-temperature treatment at varying temperatures. Various techniques, including X-ray diffraction and Raman spectroscopy showed hard carbon precursors exhibited improved properties under AGP carbonization such as larger crystallite size, sharp crystalline peaks, lower ID/IG ratio, and narrow G-full width half-maximum, an indication of improved crystallinity by lowering amorphous phase at high temperature. For soft carbon precursors, the method of carbonization did not impact the graphitization level. The most significant finding was the enhanced crystalline nature observed in hard carbon under AGP conditions, without the need for any catalyst. It shows the influence of pressure on improving the crystallinity of hard carbon precursors.

众所周知,与传统(大气)碳化法相比,加压碳化法可提高碳含量,并使生成的碳发生纹理变化。然而,有关这些碳化方法对碳前驱体石墨化质量的影响的进一步研究尚未广泛开展。本研究使用三个模型系统:酚醛树脂(硬质碳)、聚氯乙烯(PVC)(软质碳)以及 50:50 的树脂和 PVC 混合物,研究碳化方法对软质碳和硬质碳石墨化行为的影响。碳化是在自生压力(AGP)和大气压力(APP)下于 500 °C 进行的,持续 5 小时,然后在不同温度下进行高温处理。包括 X 射线衍射和拉曼光谱在内的各种技术表明,硬碳前体在 AGP 碳化条件下表现出更佳的性能,如更大的晶粒尺寸、尖锐的结晶峰、更低的内径/内径比和更窄的 G-全宽半最大值,这表明在高温下非晶相降低,从而提高了结晶度。对于软碳前驱体,碳化方法对石墨化水平没有影响。最重要的发现是,在 AGP 条件下,硬碳的结晶性增强,无需任何催化剂。这表明了压力对提高硬碳前驱体结晶度的影响。
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引用次数: 0
Layered double hydroxides and metal-organic frameworks for electrocatalytic CO2 reduction: A comprehensive review 用于电催化二氧化碳还原的层状双氢氧化物和金属有机框架:全面综述
IF 3.1 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-07-22 DOI: 10.1016/j.cartre.2024.100384
Mahider Asmare Tekalgne , Ha Huu Do , Gyeong Ho Han , Sung Hyun Hong , Jin Hyuk Cho , Sang Hyun Ahn , Soo Young Kim

Electrocatalytic carbon dioxide (CO2) reduction has emerged as a promising approach for converting CO2 into value-added products and mitigating greenhouse gas emissions. Layered double hydroxides (LDHs) and metal-organic frameworks (MOFs) have attracted significant attention as potential electrocatalysts for CO2 reduction due to their unique structural properties and tunable chemical compositions. In this review, we provide a comprehensive overview of recent advances in the utilization of LDHs and MOFs as electrocatalysts for CO2 reduction. Scrutiny on various catalysts, along with their general design ways for CO2 reduction is presented. This review will provide insight into the up-to-date research progress in MOF-based materials for CO2 conversion. Furthermore, we highlight opportunities in this field and propose future research directions aimed at optimizing the performance of LDHs and MOFs for CO2 reduction applications.

电催化二氧化碳(CO2)还原已成为将二氧化碳转化为高附加值产品和减少温室气体排放的一种前景广阔的方法。层状双氢氧化物(LDHs)和金属有机框架(MOFs)作为潜在的二氧化碳还原电催化剂,因其独特的结构特性和可调整的化学成分而备受关注。在本综述中,我们将全面概述利用 LDHs 和 MOFs 作为二氧化碳还原电催化剂的最新进展。文中介绍了各种催化剂及其用于二氧化碳还原的一般设计方法。本综述将深入介绍基于 MOF 的二氧化碳转化材料的最新研究进展。此外,我们还强调了这一领域的机遇,并提出了未来的研究方向,旨在优化 LDHs 和 MOFs 在二氧化碳还原应用中的性能。
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引用次数: 0
Optical and electrochemical analysis of nitrogen-doped carbon quantum dots from Moosa balbeesiaana peels for advanced supercapacitor applications 用于先进超级电容器的 Moosa balbeesiaana 果皮掺氮碳量子点的光学和电化学分析
IF 3.1 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-07-21 DOI: 10.1016/j.cartre.2024.100381
P. Rastogi , P. Negi , B.S. Rawat , N.C. Joshi , W. Ahmad , N. Kumar , P.S. Khati

The demand for suitable electrode materials for energy storage devices, driven by increasing energy needs and environmental concerns, has led to the investigation of green synthesis methods. In this study, a composite material (rGO@NCQDs) comprising nitrogen-doped carbon quantum dots (NCQDs) derived from Moosa balbeesiaana peels and reduced graphene oxide (rGO) was synthesized via hydrothermal methods to evaluate its photophysical properties and electrochemical performance for supercapacitors applications. Additionally, the electrochemical behavior of rGONCQDs combined with Vanadium pentoxide (V2O5) was explored.

Characterization techniques including FTIR spectroscopy revealed typical carbon-based material features in rGO-decorated NCQDs, and rGONCQDs@V2O5 composite. SEM analysis illustrated distinctive surface structures (mushroom-shaped for rGO@NCQDs and flowered-shaped for rGONCQDs@V2O5), while XRD confirmed crystalline structures with specific sizes.

Photophysical investigations demonstrated significant Solvatochromic shifts and strong solute-solvent interactions in the composites. Electrochemical studies, including cyclic Voltammetry and Galvanostatic measurements, exhibited promising performance metrics. Specifically, rGO@NCQDs demonstrated a specific capacitance of 134.68 Fg−1 with excellent retention over 5000 charge-discharge cycles. In contrast, rGONCQDs@V2O5 exhibited a maximum specific capacitance of 562.62 Fg−1 at a scan rate of 10 mVs−1 and exceptional cycle stability (96 % retention over 5000 cycles).

These findings highlight the potential of the synthesized composites as efficient electrode materials for supercapacitors, offering enhanced electrochemical performance and stability. The study underscores the importance of green synthesis approaches in developing functional materials for sustainable energy storage applications.

在能源需求和环境问题日益增长的推动下,储能设备对合适电极材料的需求促使人们开始研究绿色合成方法。本研究通过水热法合成了一种复合材料(rGO@NCQDs),该材料由掺氮的碳量子点(NCQDs)和还原型氧化石墨烯(rGO)组成,以评估其在超级电容器应用中的光物理特性和电化学性能。包括傅立叶变换红外光谱在内的表征技术揭示了 rGO 装饰的 NCQDs 和 rGONCQDs@V2O5 复合材料中典型的碳基材料特征。扫描电镜分析显示了独特的表面结构(rGO@NCQDs 为蘑菇状,rGONCQDs@V2O5 为花状),而 XRD 则证实了具有特定尺寸的晶体结构。电化学研究,包括循环伏安法和伽马静电测量,都显示出良好的性能指标。具体而言,rGO@NCQDs 的比电容为 134.68 Fg-1,在 5000 次充放电循环中保持良好。相比之下,rGONCQDs@V2O5 在扫描速率为 10 mVs-1 时的最大比电容为 562.62 Fg-1,并且具有优异的循环稳定性(5000 次循环保持率为 96%)。这些发现凸显了合成复合材料作为超级电容器高效电极材料的潜力,可提供更高的电化学性能和稳定性。这项研究强调了绿色合成方法在开发可持续储能应用功能材料方面的重要性。
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引用次数: 0
Phosphorus and nitrogen co-doped-graphene: Stability and catalytic activity in oxygen reduction reaction 磷氮共掺石墨烯:氧还原反应的稳定性和催化活性
IF 3.1 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-07-17 DOI: 10.1016/j.cartre.2024.100379
Jinmin Guo , Weiwei Shao , Hongfeng Yan , Manhong Zhao , Yang-Yi Liu , Qiufeng Fang , Tianle Xia , Jinlong Wang , Xiao-Chun Li

This study systematically investigated the stable configurations and oxygen reduction reaction (ORR) catalytic activity of PN co-doped graphene using first-principles methods. We found that PN co-doped graphene substrates are generally highly stable. The adsorption energy of adsorbates is linearly positively correlated with the number of electrons obtained from the substrate. The P atoms serve as catalytic activity sites, the co-doping of N significantly enhances the adsorption energies of intermediate species in the ORR process, facilitating the direct dissociation of O2 and O2H. The solvation effect has a non-negligible impact on the adsorption energy of adsorbates, especially for O2. Due to the excessive adsorption of O, it poisons and inhibits the catalytic activity of P active sites for ORR. However, after O adsorption, the C atoms neighboring the PN impurity atoms in the P-Nn-Gra (n=2,3) substrates exhibit better catalytic activity than that of graphene doped with P/N alone. The P-Nn-defect-Gra (n=2,3,4) substrates are potential catalysts with good HER catalytic activity.

本研究采用第一性原理方法系统地研究了掺杂 PN 的石墨烯的稳定构型和氧还原反应(ORR)催化活性。我们发现,PN 共掺杂石墨烯基底通常具有很高的稳定性。吸附剂的吸附能与从基底获得的电子数呈线性正相关。P 原子作为催化活性位点,N 的共掺杂显著增强了 ORR 过程中中间物种的吸附能,促进了 O2 和 O2H 的直接解离。溶解效应对吸附剂的吸附能有不可忽略的影响,尤其是对 O2。由于 O 的过量吸附,会毒害和抑制 ORR 的 P 活性位点的催化活性。然而,吸附 O 后,P-Nn-Gra(n=2,3)基底中与 PN 杂质原子相邻的 C 原子比单独掺杂 P/N 的石墨烯表现出更好的催化活性。P-Nn-缺陷-Gra(n=2,3,4)基底是具有良好 HER 催化活性的潜在催化剂。
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引用次数: 0
Unveiling the surface of carbon black via scanning probe microscopy and chemical state analysis 通过扫描探针显微镜和化学状态分析揭开炭黑表面的神秘面纱
IF 3.1 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-07-15 DOI: 10.1016/j.cartre.2024.100378
Mari Isagoda , Yuto Ariyoshi , Yuto Fujita , Sae Endo , Takayuki Aoki , Rui Tang , Hirotomo Nishihara , Tomoko K. Shimizu

Carbon black (CB) has wide range of industrial applications, including in the manufacturing of automobile tires, rubber products, inks, and plastics. To improve the properties of the target products and establish recycling systems, it must be fully characterized. However, characterization of CB is challenging owing to its structural complexity and the limitation of conventionally used experimental techniques, especially for surface structures at the nanoscale. In this study, we characterized the surface structures of two commercial CB via atomic force and scanning tunneling microscopy. Analysis of well-dispersed aggregates on atomically flat solid surfaces revealed primary particles of diverse sizes. The particle surfaces lacked edges, grooves, and steps that should be observed between stacked graphene sheets, which contradicts the widely accepted crystallite model. Observed images suggest that the graphene sheets exhibit a size distribution, inferring that multiple non-uniformly sized small graphene sheets are stacked turbostratically, with each sheet displaying a localized curvature rather than the ideal planar form. Varying size of sheets and curvature indicate the presence of a decent number of edges terminated with hydrogen and oxygen-containing functional groups. This interpretation was corroborated by conventional spectroscopic techniques: Raman spectroscopy, X-ray photoelectron spectroscopy, temperature-programmed desorption, and infrared absorption spectroscopy.

炭黑(CB)具有广泛的工业用途,包括用于制造汽车轮胎、橡胶制品、油墨和塑料。为了提高目标产品的性能并建立回收系统,必须对炭黑进行全面表征。然而,由于 CB 结构的复杂性和传统实验技术的局限性,特别是在纳米级表面结构方面,CB 的表征具有挑战性。在本研究中,我们通过原子力显微镜和扫描隧道显微镜对两种商用 CB 的表面结构进行了表征。通过对原子平面固体表面上分散良好的聚集体进行分析,发现了不同大小的原生颗粒。颗粒表面缺乏边缘、沟槽和台阶,而在堆叠的石墨烯片之间应该能观察到这些边缘、沟槽和台阶,这与广泛接受的晶粒模型相矛盾。观察到的图像表明,石墨烯薄片呈现出大小分布,推断出多个大小不均匀的小石墨烯薄片呈涡轮状堆叠,每个薄片都呈现出局部曲率,而不是理想的平面形式。石墨烯薄片的不同尺寸和曲率表明,存在大量以含氢和含氧官能团为末端的边缘。传统光谱技术证实了这一解释:拉曼光谱、X 射线光电子能谱、温度编程解吸和红外吸收光谱都证实了这一解释。
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引用次数: 0
Impact of process parameter on the behavior of pyrocarbon deposition in chemical vapour infiltration (CVI) process 工艺参数对化学气相渗透 (CVI) 工艺中碳氢化合物沉积行为的影响
IF 3.1 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-07-15 DOI: 10.1016/j.cartre.2024.100380
Dipoo Kumar , Anil Painuly , Vinu Viswanath V , Krishnakumar G , Deepak Kumar Agarwal , Gomathi Nageswaran

Carbon-carbon composite manufactured by deposition of pyrocarbon (PyC) through chemical vapor infiltration (CVI) has the key issue of being process parametric sensitive which necessitates the detailed study of the effect of process parameters on the rate of PyC deposition. Conventional method of studying the parametric effect by changing one variable at a time keeping the other variables constant has a limitation of more number of experiments and missing the interaction effect among the variables. Here, the effect of process parameters including temperature, pressure, methane gas flow rate, and nitrogen gas flow rate on the mass gain and PyC deposition was studied by Taguchi method, a statistical optimization method, which has the advantage of very few experiments performed at specific pairs of process parameters only. The experiments were performed at three levels of the process parameters. Carbon-Carbon composite material is processed through the CVI process where PyC was deposited on porous carbon fiber preforms at various process conditions as per the Taguchi method. The impact of gas residence time, Reynolds number, Prandtl number, and Peclet number were also investigated. It was observed that the CVI process parameters significantly affect the rate of PyC deposition. Optimized CVI process parameters are essential for achieving a high rate of PyC deposition to reduce the processing time. The findings have revealed that a higher PyC deposition rate arises under high temperatures, pressure, methane gas flow rate, and optimal nitrogen gas flow rate. The effect of the critical interaction of the CVI process parameters on the rate of PyC deposition was also obtained. Based on the experimental studies, process guidelines are proposed for the densification of carbon fibers preform to realize C/C composite products.

通过化学气相渗透(CVI)沉积热碳(PyC)制造碳-碳复合材料的关键问题是对工艺参数敏感,这就需要详细研究工艺参数对 PyC 沉积速率的影响。传统的参数效应研究方法是在保持其他变量不变的情况下,每次改变一个变量,但这种方法受到实验次数较多的限制,而且会忽略变量之间的交互效应。在此,我们采用田口方法(一种统计优化方法)研究了温度、压力、甲烷气体流速和氮气流速等工艺参数对质量增益和 PyC 沉积的影响。实验在三个工艺参数水平下进行。碳-碳复合材料是通过 CVI 工艺加工而成的,按照田口方法,在不同的工艺条件下将 PyC 沉积在多孔碳纤维预型件上。此外,还研究了气体停留时间、雷诺数、普朗特数和佩克莱特数的影响。结果表明,CVI 工艺参数对 PyC 沉积速率有显著影响。优化的 CVI 工艺参数对于实现高 PyC 沉积速率以缩短加工时间至关重要。研究结果表明,在高温、高压、甲烷气体流速和最佳氮气流速条件下,PyC 沉积率较高。此外,还获得了 CVI 工艺参数的临界相互作用对 PyC 沉积速率的影响。在实验研究的基础上,提出了实现 C/C 复合材料产品的碳纤维预型件致密化的工艺指南。
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引用次数: 0
Robust correlated magnetic moments in end-modified graphene nanoribbons 端部改性石墨烯纳米带中的稳健相关磁矩
IF 3.1 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-07-10 DOI: 10.1016/j.cartre.2024.100377
Antoine Honet , Luc Henrard , Vincent Meunier

We conduct a theoretical examination of the electronic and magnetic characteristics of end-modified 7-atom wide armchair graphene nanoribbons (AGNRs). Our investigation is performed within the framework of a single-band Hubbard model, beyond a mean-field approximation. First, we carry out a comprehensive comparison of various approaches for accommodating di-hydrogenation configurations at the AGNR ends. We demonstrate that the application of an on-site potential to the modified carbon atom, coupled with the addition of an electron, replicates phenomena such as the experimentally observed reduction of the bulk-states (BS) gap. These results for the density of states (DOS) and electronic densities align closely with those obtained through a method explicitly designed to account for the orbital properties of hydrogen atoms. Furthermore, our study enables a clear differentiation between magnetic moments already described in a mean-field (MF) approach, which are spatially confined to the same sites as the topological end-states (ES), and correlation-induced magnetic moments, which exhibit localization along all edges of the AGNRs. Notably, we show the robustness of these correlation-induced magnetic moments relative to end modifications, within the scope of the method we employ.

我们对端部修饰的 7 原子宽扶手石墨烯纳米带(AGNR)的电子和磁特性进行了理论研究。我们的研究是在平均场近似之外的单带哈伯德模型框架内进行的。首先,我们全面比较了在 AGNR 两端容纳二氢化构型的各种方法。我们证明,对修饰碳原子施加现场电势,再加上一个电子,可以复制实验观察到的体态(BS)间隙减小等现象。这些关于状态密度(DOS)和电子密度的结果与通过一种明确用于解释氢原子轨道特性的方法所获得的结果非常一致。此外,我们的研究还明确区分了平均场(MF)方法中已描述的磁矩(空间上局限于拓扑末态(ES)的相同位点)和相关诱导磁矩(沿着 AGNR 的所有边缘表现出定位)。值得注意的是,在我们采用的方法范围内,我们展示了这些相关诱导磁矩相对于末端修正的稳健性。
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引用次数: 0
A molecular dynamics investigation of laminar pyrocarbons elasticity up to high-temperatures 层状碳氢化合物高温弹性的分子动力学研究
IF 3.1 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-07-09 DOI: 10.1016/j.cartre.2024.100376
Franck Polewczyk , Paul Lafourcade , Nicolas Pineau , Christophe Denoual , Gérard L. Vignoles , Jean-Marc Leyssale

The mechanical properties of anisotropic carbons such as the pyrocarbon (pyC) matrices in C/C composites remain poorly documented, especially at elevated temperatures where these materials find most of their applications. We provide here a comprehensive molecular dynamics investigation of the high temperature – up to 4000 K – elastic behavior of six nanoscale pyC models in the context of fast temperature increases, not allowing for major structural modifications such as graphitization. We show that the structure of the most anisotropic and less disordered carbons, like the rough laminar (RL) pyC, is mostly not affected by annealing at the nanosecond timescale, aside from healing unstable defects like two-coordinated atoms at graphene edges. Conversely, highly disordered and less anisotropic carbons like the smooth laminar (SL) pyC show some significant rearrangements at grain boundaries and the development of some limited microporosity. The elastic constants of all highly anisotropic models moderately decrease with increasing temperature, somehow similarly to what is observed for graphite. Elastic constants of the SL pyC show a stronger decrease at high temperature, due to the decrease in density even though all models retain an important degree of stiffness up to 4000 K.

各向异性碳(如碳/碳复合材料中的热碳(pyC)基体)的机械特性仍然鲜有记载,尤其是在这些材料应用最广泛的高温环境下。我们在此对六种纳米级 pyC 模型的高温(高达 4000 K)弹性行为进行了全面的分子动力学研究,研究的背景是温度的快速升高,不允许出现石墨化等重大结构变化。我们的研究表明,各向异性最强、无序程度较低的碳,如粗糙层状(RL)pyC,其结构大多不受纳秒级退火的影响,除了石墨烯边缘两配位原子等不稳定缺陷的愈合。相反,像光滑层状(SL)pyC 这样高度无序且各向异性较低的碳则会在晶界处出现一些明显的重排,并形成一些有限的微孔。所有高度各向异性模型的弹性常数都会随着温度的升高而适度降低,这与石墨的情况类似。SL pyC 的弹性常数在高温下的下降幅度更大,这是由于密度的降低,尽管所有模型在 4000 K 以下都保留了很大程度的刚度。
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引用次数: 0
Structural and magnetic properties of nitrogen-doped carbon materials derived from an ionic liquid precursor 离子液体前驱体掺氮碳材料的结构和磁性能
IF 3.1 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-06-25 DOI: 10.1016/j.cartre.2024.100375
Moeka Taniguchi , Hironori Ogata , Masaru Tachibana

In this report, effects of pyrolysis conditions on the structure and magnetic properties of nitrogen-doped graphitic carbon materials prepared from 1-Buthyl-3-methyl imidazolium tricyano methanide ( [BMIm] [TCM]) ionic liquids(ILs) were investigated. It was found that nitrogen-containing graphitic carbon was formed under pyrolysis temperature of 400 °C or higher. Under the experimental conditions, the maximum nitrogen content of the obtained sample was C4N1.10 at a pyrolysis temperature of 400 °C and it was found that the nitrogen content in the obtained samples decreased with increasing pyrolysis temperature. Ferromagnetism was not observed in all the obtained samples to 2 K. From the value of the orbital diamagnetic susceptibility and XRD, it was found that the obtained sample had the structural characteristics of soft carbon.

本报告研究了热解条件对以 1-丁基-3-甲基咪唑鎓三氰基甲烷化物([BMIm] [TCM])离子液体(ILs)制备的掺氮石墨碳材料的结构和磁性能的影响。研究发现,在 400 ℃ 或更高的热解温度下会形成含氮石墨碳。在实验条件下,热解温度为 400 ℃ 时,所获样品的最大含氮量为 C4N1.10,并且发现所获样品的含氮量随热解温度的升高而降低。从轨道二磁感应强度值和 XRD 可以看出,所获得的样品具有软碳的结构特征。
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Carbon Trends
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