IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2024-10-22 DOI: 10.1016/j.carbon.2024.119731

Guojun Zheng , Zheng Xing , Jie Wang , Mingtao Lu , Haiping Hong , Zhicheng Ju

Porous carbon nanosheets were prepared using a high-temperature solid-phase method and subsequently modified through oxidative acid treatment to introduce oxygen-containing groups. The application and performance of these nanosheets as anodes in lithium-ion and potassium-ion batteries were investigated. The results indicated that the oxidative acid treatment successfully enhanced the porous carbon nanosheets' capacity for storing Li⁺/K⁺. Electrochemical analysis revealed that the oxygen-containing groups balanced intercalation and surface storage behaviors, optimizing the nanosheets' storage performance. These modified porous carbon nanosheets (termed SN@PCNs) demonstrated significantly boosted reversible Li⁺ and K⁺ storage capacities, achieving 1038.1 mAh⋅g⁻¹ and 371.7 mAh⋅g⁻¹ at 0.1 A g⁻¹, respectively, while maintaining capacities of 443.3 mAh⋅g⁻¹ for Li⁺ and 153.9 mAh⋅g⁻¹ for K⁺ at 5.0 A g⁻¹. Furthermore, the study emphasized the significance of a balanced surface capacitance and solid-phase diffusion storage mechanism in attaining high storage capacity and cycle stability. Moderate oxidation and the introduction of oxygen-containing groups were identified as crucial factors in optimizing performance. Additionally, potassium adsorption storage exhibited an advantage over lithium adsorption storage, and the impact of oxygen-containing groups on potassium storage performance was even more pronounced.

采用高温固相法制备了多孔碳纳米片，随后通过氧化酸处理对其进行了改性，引入了含氧基团。研究了这些纳米片作为锂离子电池和钾离子电池阳极的应用和性能。结果表明，氧化酸处理成功地提高了多孔碳纳米片储存 Li+/K+ 的能力。电化学分析表明，含氧基团平衡了插层和表面存储行为，优化了纳米片的存储性能。这些改性多孔碳纳米片（称为 SN@PCNs）显著提高了可逆的 Li+ 和 K+ 储存容量，在 0.1 A g-1 时分别达到 1038.1 mAh⋅g-1 和 371.7 mAh⋅g-1 ，而在 5.0 A g-1 时，Li+ 和 K+ 的储存容量分别保持在 443.3 mAh⋅g-1 和 153.9 mAh⋅g-1 。此外，研究还强调了平衡的表面电容和固相扩散存储机制对获得高存储容量和循环稳定性的重要意义。适度氧化和引入含氧基团被认为是优化性能的关键因素。此外，钾吸附储存比锂吸附储存更具优势，而含氧基团对钾储存性能的影响更为明显。

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引用次数: 0

Interfacical polarization dominant rGO aerogel decorated with molybdenum sulfide towards lightweight and high-performance electromagnetic wave absorber 用硫化钼装饰的间极化主导型 rGO 气凝胶实现轻质高性能电磁波吸收器

IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2024-10-22 DOI: 10.1016/j.carbon.2024.119738

Qiuyu Li , Liyuan Liu , Hideo Kimura , Ahmed M. Fallatah , Hua Qiu , Gaber A.M. Mersal , Ruanna Ren , Abdulraheem SA Almalki , Nannan Wu , Xueqin Sun , Wei Du , Zhanhu Guo , Chuanxin Hou

Lightweight reduced graphene oxide aerogel (rGO) has obtained enormous attention as microwave absorber due to anisotropic characteristics in their structure and electromagnetic parameters. However, the controllable preparation of reduced graphene oxide (rGO) aerogels with tailored multidimensional structure with broadened effective absorption bandwidth is a thorny difficulty. In this paper, rGO aerogel decorated with molybdenum sulfide (rGO/MoS₂) with three-dimensional (3D) layered porous structure were synthesized by a two-step hydrothermal method. The unique three-dimensional layered porous structure of graphene aerogel not only effectively avoids the stacking of graphene flake layers, but also provides space for the loading of MoS₂ nanosheets. The introduction of MoS₂ nanosheets compensates for the imbalance of impedance matching caused by graphene due to the excessive conductivity, and the folded MoS₂ nanosheets are uniformly loaded on the graphene lamellae, which is conducive to generate multiple reflections and scattering of electromagnetic waves. Besides, the construction of heterogeneous interfaces strengthens the interfacial polarizability of the composites. As a result, excellent electromagnetic wave attenuation properties were obtained for rGO/MoS₂, and the effective absorption bandwidth (EAB) reached 6.56 GHz at 2.1 mm. In addition, the radar cross section (RCS) simulation results further demonstrate the dissipation capability of the composite in practical application scenarios. This paper provides a new idea for the design of lightweight EM wave absorbing materials with broad absorption bandwidth.

轻质还原氧化石墨烯气凝胶（rGO）因其结构和电磁参数的各向异性，作为微波吸收剂受到了广泛关注。然而，如何可控地制备具有定制多维结构、有效吸收带宽更宽的还原氧化石墨烯气凝胶却是一个棘手的难题。本文采用两步水热法合成了具有三维（3D）层状多孔结构的硫化钼装饰 rGO 气凝胶（rGO/MoS2）。石墨烯气凝胶独特的三维分层多孔结构不仅有效地避免了石墨烯薄片层的堆叠，而且为MoS2纳米片的负载提供了空间。MoS2 纳米片的引入弥补了石墨烯因导电率过高而导致的阻抗匹配失衡，折叠的 MoS2 纳米片均匀地负载在石墨烯薄片上，有利于产生电磁波的多次反射和散射。此外，异质界面的构建增强了复合材料的界面极化性。因此，rGO/MoS2 获得了优异的电磁波衰减特性，在 2.1 毫米处的有效吸收带宽（EAB）达到了 6.56 GHz。此外，雷达截面（RCS）模拟结果进一步证明了该复合材料在实际应用场景中的耗散能力。本文为设计具有宽吸收带宽的轻质电磁波吸收材料提供了新思路。

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引用次数: 0

The effects of crystal orientation and common coal impurities on electronic conductivity in copper–carbon composites 晶体取向和常见煤炭杂质对铜碳复合材料电子导电性的影响

IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2024-10-21 DOI: 10.1016/j.carbon.2024.119711

K. Nepal , C. Ugwumadu , F. Kraft , Y. Al-Majali , D.A. Drabold

The electronic conduction properties of copper–graphene composite materials including common coal impurities are studied. Exploring the transport properties for three crystallographic orientations [(111), (110), and (100)] of copper in copper–graphene composites, a strong orientational dependence on electronic conductivity is shown. Graphene exhibits near-ideal registries for (111) and (110) orientations, forming a connected network between grains that enables efficient carrier transport. The influence of non-carbon elements: nitrogen (N), oxygen (O), and sulfur (S) in graphene, representing possible structures in coal-based graphene are investigated. N, O, and S in graphene negatively impact the composite’s electronic conductivity relative to pristine graphene. A new method is introduced for visualizing the spatial distribution of electrical conduction activity in materials using the square of the electronic charge density near the Fermi level, based on the work of Mott. We call this technique the

N^{2}

method.

研究了铜-石墨烯复合材料（包括常见的煤杂质）的电子传导特性。通过探索铜-石墨烯复合材料中铜的三种晶体学取向（(111)、(110)和(100)）的传输特性，发现电子传导性与取向关系密切。石墨烯在(111)和(110)取向上表现出近乎理想的注册，在晶粒之间形成了一个连接网络，从而实现了高效的载流子传输。研究了石墨烯中非碳元素：氮（N）、氧（O）和硫（S）的影响，它们代表了煤基石墨烯的可能结构。与原始石墨烯相比，石墨烯中的氮、氧和硫会对复合材料的电子导电性产生负面影响。根据莫特的研究成果，我们引入了一种新方法，利用费米级附近电子电荷密度的平方来观察材料中导电活动的空间分布。我们称这种技术为 N2 方法。

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引用次数: 0

Biomimetic soft actuator: Rapid response to multiple stimuli with programmable control 仿生软致动器：通过可编程控制对多种刺激做出快速反应

IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2024-10-21 DOI: 10.1016/j.carbon.2024.119734

Weiyu Yan , Yixiong Feng , Junjie Song , Zhaoxi Hong , Kaiyue Cui , Alexander C. Brannan , Jingyu Sun , Jianrong Tan , Xiuju Song

Stimuli-responsive soft actuators have attracted increasing attention in multiple fields since they exhibit unique advantages in safe interaction with humans and adaptability to dynamic environments. However, the study of untethered stimuli-responsive soft actuators has been limited by the slow response speed, irreversible deformations or inability in responding to multiple stimuli. Taking inspiration from the growth process of lotus leaves, we propose a novel design for an untethered soft actuator comprising graphene oxide (GO) and polyethylene (PE), which shows sensitive response to multiple stimuli, including moisture, light, heating, cooling, and elective volatile organic compounds (VOCs), and exhibits significant deformation at a rapid rate (up to 90.5°/s). The high sensitivity of the actuators enables them to be powered by the neglected energy in daily life instead of requiring specialized energy sources, paving the way for the green and sustainable development in soft robotics. In addition, the bending modes and bending degrees of actuators can be programmed to meet the personalized needs of complex three-dimensional structures. Based on GO/PE actuators, a variety of multi-stimuli-responsive intelligent devices have been developed to demonstrate their application potential in arts, bionics, soft robotics and wearable devices, including interesting WordArt, Chinese paper-cut art pieces, artificial iris, soft crawling robots and a smart cloth unit with adjustable breathability.

刺激响应式软致动器在与人类安全互动和适应动态环境方面具有独特优势，因此在多个领域受到越来越多的关注。然而，由于反应速度缓慢、变形不可逆或无法对多种刺激做出响应，对无系绳刺激响应软致动器的研究一直受到限制。我们从荷叶的生长过程中汲取灵感，提出了一种由氧化石墨烯（GO）和聚乙烯（PE）组成的无系链软致动器的新设计，该致动器对湿度、光、加热、冷却和可选挥发性有机化合物（VOCs）等多种刺激具有灵敏的响应，并能以快速的速度（高达 90.5°/s）表现出显著的形变。致动器的高灵敏度使其能够利用日常生活中被忽视的能源，而不需要专门的能源，为软机器人技术的绿色和可持续发展铺平了道路。此外，致动器的弯曲模式和弯曲度可以通过编程实现，以满足复杂三维结构的个性化需求。基于 GO/PE 执行器，我们开发了多种多刺激响应智能装置，展示了它们在艺术、仿生学、软体机器人和可穿戴设备方面的应用潜力，包括有趣的文字艺术、中国剪纸艺术作品、人造虹膜、软体爬行机器人和可调节透气性的智能布料装置。

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引用次数: 0

Pyramid-like magnetic carbon composites device toward tunable and adaptive radar-visible compatible properties 金字塔型磁性碳复合材料装置，实现可调和自适应雷达可见光兼容特性

IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2024-10-21 DOI: 10.1016/j.carbon.2024.119737

Shennan Guo, Shujuan Tan, Ximing Zhang, Xinghan Huang, Guangbin Ji

Equipped with intelligent adjustable electromagnetic-visible light compatibility characteristics is of significant importance in military stealth fields. In this work, a tunable microwave absorption and visible light change metamaterial based on polylactic acid (PLA) thermal stimulation was fabricated using 4D printing technology with hydroxylated carbon nanotubes (CNTOH) and carbonyl iron powder (CIP) as active ingredients. The printing filament was synthesized, which exhibited excellent absorption performance with a bandwidth of 5.83 GHz and sufficient shape recovery ability. On this basis, a temperature-dominated shape memory variation cone device was also manufactured and the visible light color-changing coating was sprayed. The microwave absorption performance is adjusted according to the petal angle, achieving a bandwidth variation of 5.9–9.8 GHz. This work confirms the potential exploratory value of the designed shape memory polymer in the field of microwave absorption, and provides unlimited possibilities for designing intelligent controlled stealth materials.

具备智能可调的电磁-可见光兼容特性在军事隐身领域具有重要意义。本研究以羟基化碳纳米管（CNTOH）和羰基铁粉（CIP）为活性成分，利用 4D 打印技术制备了一种基于聚乳酸（PLA）热刺激的可调微波吸收和可见光变化超材料。合成的打印丝具有优异的吸收性能，带宽达 5.83 GHz，并具有足够的形状恢复能力。在此基础上，还制造了以温度为主的形状记忆变化锥装置，并喷涂了可见光变色涂层。微波吸收性能随花瓣角度的变化而调整，实现了 5.9-9.8 GHz 的带宽变化。这项工作证实了所设计的形状记忆聚合物在微波吸收领域的潜在探索价值，为设计智能可控隐形材料提供了无限可能。

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引用次数: 0

Outside Front Cover - Journal name, Cover image, Volume issue details, ISSN, Cover Date, Elsevier Logo and Society Logo if required 封面外侧 - 期刊名称、封面图片、卷期详情、ISSN、封面日期、爱思唯尔徽标和学会徽标（如需要

IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2024-10-20 DOI: 10.1016/S0008-6223(24)00936-9

引用次数: 0

Observation of thickness-independent ultrafast relaxation times in MPCVD few-layer graphene 在 MPCVD 少层石墨烯中观测到与厚度无关的超快弛豫时间

IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2024-10-18 DOI: 10.1016/j.carbon.2024.119700

Tânia M. Ribeiro , Tiago E.C. Magalhães , Bohdan Kulyk , Alexandre F. Carvalho , Sebastian Nilsson , Henrik Feuk , António J.S. Fernandes , Florinda Costa , Paulo T. Guerreiro , Helder Crespo

Graphene presents unique optoelectronic properties, making it attractive for the development of a wide range of new and advanced technological applications such as high-speed photodetectors and all-optical modulators. The study and control of the generated carriers in graphene, namely their ultrafast relaxation dynamics, are of great importance for these applications. Here, we report the ultrafast relaxation times of photogenerated carriers in few-layer graphene grown by microwave plasma chemical vapour deposition. Graphene samples with 3, 5 and 6 layers were studied by degenerate femtosecond optical pump-probe spectroscopy. We observed a fast relaxation constant on the order of

120 - 180 fs

and a slow relaxation constant below 1 ps, associated with carrier-carrier scattering and carrier-phonon scattering processes, respectively. These results suggest that small variations in the number of graphene layers do not affect the dynamics.

石墨烯具有独特的光电特性，使其在开发高速光电探测器和全光调制器等各种新型先进技术应用方面具有吸引力。研究和控制石墨烯中产生的载流子，即它们的超快弛豫动力学，对这些应用具有重要意义。在这里，我们报告了通过微波等离子体化学气相沉积法生长的少层石墨烯中光生载流子的超快弛豫时间。我们采用变性飞秒光学泵浦探针光谱法研究了 3 层、5 层和 6 层石墨烯样品。我们观察到一个 120-180fs 量级的快速弛豫常数和一个低于 1 ps 的慢速弛豫常数，它们分别与载流子-载流子散射和载流子-声子散射过程有关。这些结果表明，石墨烯层数的微小变化不会影响动力学。

{"title":"Observation of thickness-independent ultrafast relaxation times in MPCVD few-layer graphene","authors":"Tânia M. Ribeiro , Tiago E.C. Magalhães , Bohdan Kulyk , Alexandre F. Carvalho , Sebastian Nilsson , Henrik Feuk , António J.S. Fernandes , Florinda Costa , Paulo T. Guerreiro , Helder Crespo","doi":"10.1016/j.carbon.2024.119700","DOIUrl":"10.1016/j.carbon.2024.119700","url":null,"abstract":"<div><div>Graphene presents unique optoelectronic properties, making it attractive for the development of a wide range of new and advanced technological applications such as high-speed photodetectors and all-optical modulators. The study and control of the generated carriers in graphene, namely their ultrafast relaxation dynamics, are of great importance for these applications. Here, we report the ultrafast relaxation times of photogenerated carriers in few-layer graphene grown by microwave plasma chemical vapour deposition. Graphene samples with 3, 5 and 6 layers were studied by degenerate femtosecond optical pump-probe spectroscopy. We observed a fast relaxation constant on the order of <span><math><mrow><mn>120</mn><mo>−</mo><mn>180</mn><mspace></mspace><mi>fs</mi></mrow></math></span> and a slow relaxation constant below 1 ps, associated with carrier-carrier scattering and carrier-phonon scattering processes, respectively. These results suggest that small variations in the number of graphene layers do not affect the dynamics.</div></div>","PeriodicalId":262,"journal":{"name":"Carbon","volume":"232 ","pages":"Article 119700"},"PeriodicalIF":10.5,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142655823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Innovative RGO-bridged S-scheme CuFe2O4@Ag2S heterojunction for efficient Sun-light-driven photocatalytic disintegration of Ciprofloxacin 创新性 RGO 桥接 S 型 CuFe2O4@Ag2S 异质结用于太阳光驱动的环丙沙星高效光催化分解

IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2024-10-18 DOI: 10.1016/j.carbon.2024.119725

Moslem Azqandi , Kasra Nateq , Fatemeh Golrizkhatami , Negin Nasseh , Neda Seyedi , Narjes Sadat Mazari Moghaddam , Farzaneh Fanaei

Antibiotics contamination in water bodies poses a significant threat to public health and the environment, necessitating advanced methods for their removal from wastewater. In response to this issue, developing a novel magnetic nanocomposite (RGO/CuFe₂O₄@Ag₂S) as an efficient photocatalyst for the degradation of pharmaceuticals like ciprofloxacin (CIP) is of great importance. The synthesized nanocomposite underwent comprehensive characterization to elucidate its crystalline structure, chemical bonding, surface morphology, elemental composition, internal structure, optical properties, surface area, particle size distribution, and magnetic properties. Under optimized conditions (pH = 9, nanocomposite dose = 0.5 g/L, CIP concentration of 20 mg/L, and duration of 200 min), the nanocomposite demonstrated complete degradation of CIP. Moreover, post-treatment analysis revealed significant reductions in total organic carbon (TOC) and chemical oxygen demand (COD) of 70.08 % and 85.08 %, respectively, indicating extensive mineralization of the antibiotic. Mechanistic investigations revealed a unique S-scheme heterojunction in the RGO/CuFe₂O₄@Ag₂S nanocomposite, where RGO acts as an electronic bridge between CuFe₂O₄ and Ag₂S. This innovative architecture facilitates efficient charge separation and transfer, significantly enhancing the photocatalytic activity. Reusability tests demonstrated the robust nature of the photocatalyst, with only a modest 6 % decline in efficiency after six consecutive cycles. To further assess the system's effectiveness in real-world applications, its performance was evaluated in treating pharmaceutical wastewater. The biodegradation efficiency was quantified by measuring the Average Oxidation State (AOS) and Carbon Oxidation State (COS) of the wastewater samples before and after treatment.

水体中的抗生素污染对公众健康和环境构成了严重威胁，因此需要采用先进的方法从废水中去除抗生素。针对这一问题，开发一种新型磁性纳米复合材料（RGO/CuFe2O4@Ag2S）作为降解环丙沙星（CIP）等药物的高效光催化剂具有重要意义。对合成的纳米复合材料进行了全面的表征，以阐明其晶体结构、化学键、表面形貌、元素组成、内部结构、光学性能、表面积、粒度分布和磁性能。在优化条件下（pH = 9、纳米复合材料剂量 = 0.5 g/L、CIP 浓度为 20 mg/L、持续时间为 200 分钟），纳米复合材料完全降解了 CIP。此外，后处理分析表明，总有机碳（TOC）和化学需氧量（COD）分别显著降低了 70.08 % 和 85.08 %，表明抗生素被广泛矿化。机理研究揭示了 RGO/CuFe2O4@Ag2S 纳米复合材料中独特的 S 型异质结，其中 RGO 充当了 CuFe2O4 和 Ag2S 之间的电子桥。这种创新结构有利于电荷的有效分离和转移，从而显著提高了光催化活性。可重复使用性测试证明了这种光催化剂的稳健性，在连续使用六个周期后，效率仅略微下降 6%。为了进一步评估该系统在实际应用中的有效性，我们对其处理制药废水的性能进行了评估。通过测量废水样品处理前后的平均氧化态（AOS）和碳氧化态（COS），对生物降解效率进行了量化。

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引用次数: 0

Enhanced desalination performance of flow capacitive deionization with the addition of conductive polymer in redox couples and activated carbon 在氧化还原耦合剂和活性炭中添加导电聚合物，提高流动电容式去离子法的海水淡化性能

IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2024-10-18 DOI: 10.1016/j.carbon.2024.119703

Thaw Tar Aye Lwin , Xi Chen , Mono Zaw , Soe Ko Ko Aung , Nyein Wint Lwin , Than Zaw Oo , Afzalshoh Qahramon Zarifzoda , Kwan San Hui , Fuming Chen

Freshwater scarcity is a critical global issue and desalination of brackish water and seawater technologies are regarded as effective solution to mitigate the increasing severity of water shortage. Flow-electrode capacitive deionization (FCDI) is an emerging electrochemical desalination technology capable of continuous deionization behavior. However, reducing energy consumption and enhancing desalination rate are now markedly needed for its advancement. Herein, we propose a FCDI system with energy consumption as low as 88.08 kJ mol⁻¹ and a desalting rate of 1.75 μg cm⁻² s⁻¹. This is achieved by using flow electrodes containing 0.03125 wt% conductive polymer, 5 wt% activated carbon/carbon black and 80 mM/80 mM ferricyanide/ferrocyanide at a current density 3 mA cm⁻² (3.36 mA current for a 1.12 cm² active area). We further investigate the effects of polymer content, redox pair content, salt content and current densities on desalination performance. Seawater with a conductivity of 52.78 mS cm⁻¹ was successfully desalinated to 0.50 mS cm⁻¹ in continuous process. This research provides a promising approach to enhance FCDI system by achieving a low energy consumption and high salt removal rate, representing a significant advancement in continuous electrochemical desalination technology.

淡水匮乏是一个严重的全球性问题，而苦咸水和海水淡化技术被认为是缓解日益严重的水资源短缺问题的有效解决方案。流动电极电容式去离子（FCDI）是一种新兴的电化学海水淡化技术，能够连续进行去离子操作。然而，降低能耗和提高脱盐率是该技术发展的当务之急。在此，我们提出了一种能耗低至 88.08 kJ mol-1、脱盐率为 1.75 μg cm-2 s-1 的 FCDI 系统。这是通过使用含有 0.03125 wt% 导电聚合物、5 wt% 活性炭/炭黑和 80 mM/80 mM 三氯化铁/铁氰化物的流动电极在 3 mA cm-2 的电流密度下实现的（1.12 cm2 活性面积的电流为 3.36 mA）。我们进一步研究了聚合物含量、氧化还原对含量、盐含量和电流密度对海水淡化性能的影响。在连续过程中，电导率为 52.78 mS cm-1 的海水成功脱盐至 0.50 mS cm-1。这项研究通过实现低能耗和高盐去除率，为增强 FCDI 系统提供了一种可行的方法，标志着连续电化学海水淡化技术的重大进步。

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引用次数: 0

Enhancing the mechanical and electrochemical properties of reduced graphene oxide composites films through the combined actions of chitosan and polypyrrole 通过壳聚糖和聚吡咯的联合作用增强还原氧化石墨烯复合薄膜的机械和电化学性能

IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2024-10-18 DOI: 10.1016/j.carbon.2024.119715

Jie Zhao , Wenjian Zhang , Guojun Song, Li Li, Yujie Yue, Xiaoran Wang, Min Fang, Feng Jiang, Lichun Ma

With high conductivity, large surface area and a large number of interlayer structures, graphene has become an excellent choice for electrode materials in supercapacitors, but its mechanical strength and electrochemical performance need to be further improved. Herein, chitosan and polypyrrole were introduced into graphene oxide successively by a simple and low-cost method, and then the composite film was reduced by hydroiodic acid, leading to excellent mechanical and electrochemical properties. Structural characterizations verified the existence of covalent bond, π-π interaction and hydrogen bond, effectively improving the poor interface bonding between graphene sheets. The tensile strength and the microhardness of the composite film was increased by 182 % and 3000 % compared with original film. Electrochemical tests showed significantly improvement of the electrochemical activity, and the capacitance value could reach 170 F/g. This composite film with high strength and high electrochemical performance will become a promising candidate material in the field of flexible supercapacitors.

石墨烯具有导电率高、比表面积大、层间结构多等特点，已成为超级电容器电极材料的最佳选择，但其机械强度和电化学性能有待进一步提高。本文采用简单、低成本的方法将壳聚糖和聚吡咯先后引入氧化石墨烯，然后用氢碘酸还原复合膜，从而获得了优异的机械性能和电化学性能。结构表征验证了共价键、π-π相互作用和氢键的存在，有效改善了石墨烯片之间界面结合力差的问题。与原始薄膜相比，复合薄膜的拉伸强度和显微硬度分别提高了 182% 和 3000%。电化学测试表明，电化学活性明显提高，电容值达到 170 F/g。这种具有高强度和高电化学性能的复合薄膜将成为柔性超级电容器领域一种前景广阔的候选材料。

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引用次数: 0

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