共查询到20条相似文献,搜索用时 78 毫秒
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近年来, 过渡金属硫族化合物(TMDs)作为一种新兴的二维材料, 因其独特的层状结构及电学特性成为超级电容器电极材料的理想候选者之一. 本文介绍了二维TMDs的常用合成方法, 阐述了钼基、 钨基和钒基等TMDs在超级电容器中的研究进展, 分析了形貌、 尺寸和改性方法等因素对TMDs材料电化学性能的影响, 并对TMDs在超级电容器领域的工业化应用和挑战进行了总结与展望. 相似文献
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二维过渡金属硫族化合物(two-dimensional transition metal dichalcogenides,TMDs)具有厚度在原子级别、禁带宽度随层数在1~2 eV内变化、高载流子迁移率(如MoS2载流子迁移率达到了200 cm2·V-1·s-1)等特点,在光学、电学等领域具有广泛应用。TMDs的超薄特性使此类材料与块体材料相比,更容易受到缺陷调控的影响,改变材料原有性能。在本综述中,首先介绍了TMDs的晶体结构和相结构,并根据维度特征对缺陷的类型进行了分类;接着从缺陷的抑制和修复,以及缺陷的制造两方面出发,总结了缺陷调控TMDs材料性能的最新研究进展;在此基础上,介绍了缺陷工程在电学、光学、磁学、电催化等领域的具体应用;最后,本综述讨论了缺陷工程在应用过程中面临的实际问题,并对其未来的研究及发展方向进行了展望。 相似文献
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组装高能量密度的非对称超级电容器需要使用比电容大、 体积变化小且循环稳定性好的电极材料. 过渡金属硫化物(TMSs)与纳米碳材料的复合物是此类电极材料之一. 采用水热法合成了由Cu-Mo硫化物在微波剥离的还原氧化石墨烯表面生长的复合材料(CuS-MoS2/MErGO). 此复合材料在电流密度为2 A/g时具有高达861.5 F/g的比电容和良好的循环稳定性. 将1.6 V的电池电压施加在由NiS/MErGO为正极, CuS-MoS2/MErGO为负极组装成的不对称超级电容器上时, 该电容器的功率密度为1.28 kW/kg, 且能量密度保持为54.2 W·h·kg-1. 结果表明, TMS复合材料是一种很有前途的高性能电化学储能材料, 尤其是用于非对称超级电容器的组装. 相似文献
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《中国化学快报》2023,34(11):108226
Flexible electronics technology is considered as a revolutionary technology to unlock the bottleneck of traditional rigid electronics that prevalent for decades, thereby fueling the next-generation electronics. In the past few decades, the research on flexible electronic devices based on organic materials has witnessed rapid development and substantial achievements, and inorganic semiconductors are also now beginning to shine in the field of flexible electronics. As validated by the latest research, some of the inorganic semiconductors, particularly those at low dimension, unexpectedly exhibited excellent mechanical flexibility on top of superior electrical properties. Herein, we bring together a comprehensive analysis on the recently burgeoning low-dimension inorganic semiconductor materials in flexible electronics, including one-dimensional (1D) inorganic semiconductor nanowires (NWs) and two-dimensional (2D) transition metal dichalcogenides (TMDs). The fundamental electrical properties, optical properties, mechanical properties and strain engineering of materials, and their performance in flexible device applications are discussed in detail. We also propose current challenges and predict future development directions including material synthesis and device fabrication and integration. 相似文献
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A. I. Romanenko G. E. Yakovleva V. E. Fedorov A. Yu. Ledneva V. A. Kuznetsov A. V. Sotnikov A. R. Tsygankova B. M. Kuchumov 《Journal of Structural Chemistry》2017,58(5):893-900
Temperature dependences of the electrical conductivity are studied in the range 4.2’300 K and Seebeck coefficient at room temperature of bulk samples of tungsten dichalcogenide polycrystals with niobium substitutions for tungsten and selenium substitutions for sulfur – W1–x Nb x (S1–y Se y )2. The two-dimensionalization of electron transport properties is detected at niobium concentrations x ≥ 0.1 in W1–x Nb x S2 and x ≥ 0.05 in W1–x Nb x Se2. In samples with additional partial selenium substitution for sulfur the electron transport remains three-dimensional. At room temperature the Seebeck coefficient (at equal electrical conductivities) is several times higher in the samples with quasi-two-dimensional transport than in the samples with three-dimensional transport. The calculation of the power factor at room temperature shows its nine times increase. 相似文献
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Divya Monga Surbhi Sharma Nagaraj P. Shetti Soumen Basu Kakarla Raghava Reddy Tejraj M. Aminabhavi 《Materials Today Chemistry》2021
Two-dimensional transition metal dichalcogenides (TMDCs) are the layered materials that have gained substantial consideration in a wide range of applications. The TMDCs possess exceptional properties such as high surface-to-volume ratio, excellent charge transfer capacity, mechanical strength, and low bandgap energy. Additionally, TMDCs (MoS2, WS2, etc.) are abundant, have a low synthesis cost, and are visible-light-active. The appealing surface morphologies and properties of TMDCs make them an appropriate choice for diverse applications like photocatalytic degradation of hazardous pollutants, energy conversion reactions (electrocatalytic and photocatalytic H2 production), and energy storage devices (supercapacitors and rechargeable batteries) in addition to bio/chemical sensors. This article addresses the latest trends and advancements in the domain of TMDC-based nanomaterials. The different synthesis routes have been comprehensively reviewed. The challenges faced by TMDCs at a large scale and the future scope have also been discussed. 相似文献
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Ruiwen Shao Chengkai Yang Chen Yang Shulin Chen Weikang Dong Bairong Li Xiumei Ma Jing Lu Lixin Dong Peng Gao Dapeng Yu 《Journal of Energy Chemistry》2021,(7):280-284
The two-dimensional (2D) structure of layered transition metal dichalcogenides (TMDs) provides unusual physical properties [1,2] and chemical reactivity [3,4], ... 相似文献
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《中国化学快报》2021,32(12):3762-3770
Recent years have witnessed the wide contributions made by transition metal dichalcogenides (TMDCs) to various fields, including the biomedical field. Here, to identify and further promote the development of biomedical TMDCs, we provide a bibliometric analysis of literature regarding TMDCs for biomedical applications. Firstly, general bibliometric distributions of the dataset by year, country, institute, Web of Science category and referenced source are recognized. Following, we carefully explore the research hotspots of the TMDC-related biomedical field, among which biosensing, bioelectronics, cancer theranostics, antibacterial and tissue engineering are identified. The functions of TMDCs in each biomedical scenario, the related properties and research challenges are highlighted. Finally, future prospects are proposed to shed light on the design of novel TMDC-related biomaterials, potential new biomedical applications, as well as their clinical translation. 相似文献
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《中国化学快报》2022,33(10):4437-4448
For more than a decade, the exfoliation of graphene and other layered materials has led to a tremendous amount of research in two-dimensional (2D) materials, among which 2D transition metal chalcogenides (TMCs) nanomaterials have attracted much attention in a wide range of applications including photoelectric devices, lithium-ion batteries, catalysis, and energy conversion and storage owing to their unique photoelectric physical properties. With such large specific surface area, strong near-infrared (NIR) absorption and abundant chemical element composition, 2D TMCs nanomaterials have become good candidates in biomedical imaging and cancer treatment. This review systematically summarizes recent progress on 2D TMCs nanomaterials, which includes their synthesis methods and applications in cancer treatment. At the end of this review, we also highlight the future prospects and challenges of 2D TMCs nanomaterials. It is expected that this work can provide the readers with a detailed overview of the synthesis of 2D TMCs and inspire more novel functional biomaterials based on 2D TMCs for cancer treatment in the future. 相似文献
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In this perspective, we highlight the importance of nanoscale disorder and mesoscale morphology to enhance the activity and tune the selectivity of group VI transition metal dichalcogenide electrocatalysts toward two paramount reductions reactions as H2 evolution reaction and CO2 reduction. The strategy we propose takes advantage of the metastable nanoscale atomic arrangement of highly disordered and amorphous materials, to overcome the limits of the typical transition metal dichalcogenide crystalline catalysts. For the H2 evolution reaction, going beyond the creation of point defects in crystalline structures in favor of fully amorphous organizations not only increases the per-site activity and active surface area but also improves the conductivity and the reaction kinetics. In addition, the incorporation of nanoscale disorder promotes the formation of complex products in CO2 reduction through reaction pathways inaccessible on other sites. On the other hand, the mesoscale architecture of the catalyst controls mass transport in both the liquid and gas phase, as well as determines the real-world performance of catalysts. We suggest that by exploiting disordered nanoscale organization and controlled mesoscale features, the performances can be drastically improved to reach the state-of-art metallic electrocatalysts. 相似文献
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Marco Lunardon Mattia Cattelan Stefano Agnoli Gaetano Granozzi 《Current Opinion in Electrochemistry》2022
Due to their low cost and overall sustainability, transition metal dichalcogenides (TMDCs) are potential alternatives to noble metals as catalysts to produce green hydrogen. A promising route to improve their performances consists of activating their basal plane, both increasing the number of active sites or their specific activity. This can be accomplished by exploiting point defects, in-plane boundaries and strain. In particular, single atom adsorbed or incorporated into TMDCs have shown remarkable results in electrochemical half-cell tests. Topological curvature or grain boundaries (and related defects) can also be used to further boost the performances. A crucial point for the application of such strategies is related to the development of cost effective and sustainable methods for the scale-up of synthetic protocols. 相似文献
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Zi-Meng Zhang Wen-Li Chang Zi-Qi Sun Xin-Huan He Ji-Long Zhang Xiao-Ping Wei Xiaoma Tao 《International journal of quantum chemistry》2024,124(3):e27350
The exceptional electron transfer properties and low thermal conductivity of two-dimensional layered materials render them a promising choice for thermoelectric applications. In this study, we explore the stability, electronic properties, and thermoelectric characteristics of materials composed of two-dimensionally layered transition metal nitride HfNF. Our research findings show that the structure of HfNF is stable and exhibits the properties of a direct bandgap semiconductor. Furthermore, we employ the Boltzmann transport theory and Slack model to investigate the thermoelectric properties of HfNF within the temperature range of 300 to 900 K. The HfNF materials exhibit relatively large thermoelectric dominance values ( values), with the -type HfNF demonstrating a maximum value of 1.46. Furthermore, utilizing the quasi-harmonic Debye model, thermodynamic properties such as heat capacity, coefficient of thermal expansion, and bulk modulus within the 6 GPa and 600 K range are estimated. Based on these calculations, it is predicted that two-dimensional HfNF materials will serve as promising new materials for thermoelectric applications spanning from 300 to 900 K. 相似文献