IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2024-10-26 DOI: 10.1016/j.carbon.2024.119761

Li Zeng, Wenbin Kang, Xingang Liu, Hanna He, Xiaolong Li, Chuhong Zhang

The rigorous demand for significantly enhanced performance gains in metrics of areal and volumetric energy density from futuristic energy storage devices is driving current technological endeavors towards the design of highly-loaded energy storage systems. The advancement of supercapacitors has faced a formidable challenge in reconciling ultra-high areal (>1 mWh cm⁻²) and volumetric performance (>10 mWh cm⁻³) due to the intricate issue of efficient mass transport in a highly loaded environment. Here, the capability of 3D printing technology to architect open frameworks is well leveraged in conjunction with material interface decoration to create a heavily loaded pseudocapacitive MnO₂ electrode of low structural tortuosity and fast surface reaction. By harnessing the potential of self-assembly, a robust electrode composed of ubiquitous micro-springs is developed, permitting elastic strain engineering that exceptionally augmented the volumetric performance while preserving efficient mass transport pathways for reasonable kinetics. Coupling with these features, a groundbreaking achievement is attained as an individual supercapacitor unit now boasts an unprecedented ultrahigh areal energy density of 2.83 mWh cm⁻² and volumetric energy density of 37.3 mWh cm⁻³. The proposed strategy provides an informative roadmap benefiting the construction of next-level electrochemical energy storage devices.

未来的储能设备需要在面积和体积能量密度方面大幅提高性能，这种严格的要求推动着当前的技术努力朝着设计高负载储能系统的方向发展。由于在高负载环境中高效传输质量这一错综复杂的问题，超级电容器的发展在协调超高面积（1 mWh cm-2）和体积性能（10 mWh cm-3）方面面临着严峻的挑战。在这里，3D 打印技术与材料界面装饰相结合，很好地利用了构建开放式框架的能力，创造出了一种结构扭曲度低、表面反应快的高负载伪电容 MnO2 电极。通过利用自组装的潜力，开发出了一种由无处不在的微弹簧组成的坚固电极，允许进行弹性应变工程，从而极大地增强了体积性能，同时为合理的动力学保留了高效的质量传输途径。结合这些特点，我们取得了突破性的成就，单个超级电容器单元现在拥有前所未有的超高面能量密度（2.83 mWh cm-2）和体积能量密度（37.3 mWh cm-3）。所提出的策略为下一代电化学储能装置的建造提供了一个信息丰富的路线图。

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引用次数: 0

Strong current in carbon nanoconductors: Mechanical and magnetic stability 碳纳米导体中的强电流：机械和磁稳定性

IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2024-10-25 DOI: 10.1016/j.carbon.2024.119708

S. Leitherer , N. Papior , M. Brandbyge

Carbon nanoconductors are known to have extraordinary mechanical strength and interesting magnetic properties. Moreover, nanoconductors based on one- or two-dimensional carbon allotropes display a very high current-carrying capacity and ballistic transport. Here, we employ a recent, simple approach based on density functional theory to analyze the impact of strong current on the mechanical and magnetic properties of carbon nanoconductors. We find that the influence of the current itself on the bond-strength of carbon in general is remarkably low compared to e.g. typical metals. This is demonstrated for carbon chains, carbon nanotubes, graphene and polyacetylene. We can trace this to the strong binding and electronic bandstructure. On the other hand, we find that the current significantly change the magnetic properties. In particular, we find that currents in graphene zig-zag edge states quench the magnetism.

众所周知，碳纳米导体具有非凡的机械强度和有趣的磁性能。此外，基于一维或二维碳同素异形体的纳米导体显示出极高的载流能力和弹道传输能力。在此，我们采用一种基于密度泛函理论的最新简单方法来分析强电流对碳纳米导体机械和磁性能的影响。我们发现，与典型金属等相比，电流本身对碳键强度的影响非常小。碳链、碳纳米管、石墨烯和聚乙炔都证明了这一点。我们可以将其归因于强大的结合力和电子带状结构。另一方面，我们发现电流会显著改变磁性。特别是，我们发现石墨烯 "之 "字形边缘状态下的电流会淬灭磁性。

引用次数: 0

3D-printed gradient conductivity and porosity structure for enhanced absorption-dominant electromagnetic interference shielding 用于增强吸收主导型电磁干扰屏蔽的三维打印梯度导电性和多孔性结构

IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2024-10-24 DOI: 10.1016/j.carbon.2024.119759

Sol Lee , Daeyoung Kim , Nam Khanh Nguyen , Wonkyo Kim , Minje Kim , Junghyo Nah

The application of 3D printing for the development of electromagnetic interference (EMI) shielding materials is currently constrained by a limited range of material options and design schemes. In this work, we developed conductivity-modulated polylactic acid (PLA)-MXene composite filaments for fused deposition modeling (FDM) 3D printing, demonstrating excellent printability and durability. Utilizing these filaments, we propose a design scheme focused on absorption-dominant EMI shielding materials. Our design features non-conductive PLA with larger pores at the incident surface, transitioning to layers with increasing conductivity and decreasing pore sizes. This gradient structure minimizes reflection by providing impedance matching and enhances absorption by extending the propagation path of EM waves through multiple reflections and scattering within the pores. Additionally, interfacial polarization effects between air, PLA, and MXene nanoflakes strengthen the absorption mechanisms. Both simulation and experimental results confirm that the combined gradient conductivity and pore size structures significantly improve EMI shielding effectiveness (EMI SE) and absorptivity, achieving an EMI SE of 65 dB and an absorptivity of 0.76 in the X-band. Our findings underscore its potential to create adaptable, high-performance EMI shields suitable for complex geometries and reducing secondary interference.

目前，应用三维打印技术开发电磁干扰（EMI）屏蔽材料受到材料选择和设计方案范围有限的限制。在这项工作中，我们开发了用于熔融沉积建模（FDM）三维打印的导电性调制聚乳酸（PLA）-MXene 复合长丝，展示了出色的可打印性和耐用性。利用这些长丝，我们提出了一种以吸收为主的 EMI 屏蔽材料设计方案。我们的设计采用非导电聚乳酸，在入射表面具有较大的孔隙，然后过渡到导电性不断增强、孔隙尺寸不断减小的层。这种梯度结构通过提供阻抗匹配来减少反射，并通过孔隙内的多次反射和散射来延长电磁波的传播路径，从而增强吸收。此外，空气、聚乳酸和 MXene 纳米片之间的界面极化效应也加强了吸收机制。模拟和实验结果都证实，梯度电导率和孔隙大小相结合的结构显著提高了 EMI 屏蔽效果（EMI SE）和吸收率，在 X 波段的 EMI SE 达到 65 dB，吸收率达到 0.76。我们的研究结果凸显了它在制造适用于复杂几何形状的高性能 EMI 屏蔽层和减少二次干扰方面的潜力。

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引用次数: 0

Ultrahigh strength – ductility in Ti–6Al–4V composites with high-activity graphene-induced in-situ TiC and coherent nanophases 具有高活性石墨烯诱导原位 TiC 和相干纳米相的 Ti-6Al-4V 复合材料的超高强度 - 延展性

IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2024-10-24 DOI: 10.1016/j.carbon.2024.119760

Chengze Liu , Longlong Dong , Guodong Sun , Wei Zhang , Junjie Xu , Mingjia Li , Yongqing Fu , Yusheng Zhang

Achieving ultra-high strength and ductility of titanium alloys possesses great potential for structural applications in the aerospace and military, yet there is a great challenge for breaking the trade-off barrier of these two properties. In this study, large elongation of ∼10 % and ultra-high tensile strengths of 1510 MPa were obtained in a titanium-based composite. We designed this superior composite based on nanoscale coherent αʹʹ precipitation within near-equiaxed β-Ti as well as micro-scale TiC network architectures along grain boundaries. These in-situ formed triangular αʹʹ coherent precipitates and TiC mainly contributed to the strengthening, while the extremely large elongation resulted from coherent β/αʹʹ interfaces and strain-induced coherent αʹʹ nanotwins. We demonstrated that this composite was easily fabricated using a simple powder metallurgy followed by a hot rolling process. This work can contribute to the design of duplex titanium-based composites as well as other structural materials with exceptional mechanical properties for broad applications.

实现钛合金的超高强度和延展性在航空航天和军事领域的结构应用中具有巨大潜力，但要打破这两种性能的权衡障碍仍面临巨大挑战。在这项研究中，钛基复合材料获得了 10 % 的大伸长率和 1510 兆帕的超高拉伸强度。我们设计的这种优异的复合材料是基于近均相β-钛中的纳米级相干αʹʹ沉淀以及沿晶界的微米级 TiC 网络结构。这些原位形成的三角形αʹʹ相干析出物和TiC对强化起了主要作用，而极高的伸长率则来自相干β/αʹʹ界面和应变诱导的相干αʹʹ纳米网。我们证明，这种复合材料很容易通过简单的粉末冶金和热轧工艺制造出来。这项工作有助于设计双相钛基复合材料以及其他具有优异机械性能的结构材料，从而实现广泛的应用。

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引用次数: 0

Thickness-controlled HsGDY/N-doped double-shell hollow carbon tubes for broadband high-performance microwave absorption 厚度可控的 HsGDY/N 掺杂双壳空心碳管用于宽带高性能微波吸收

IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2024-10-23 DOI: 10.1016/j.carbon.2024.119740

Fangrong Zhang , Lei Zhang , Jiqi Wang , Baoliang Zhang

With the increasing deterioration of the electromagnetic environment, it is important to develop new and efficient electromagnetic wave-absorbing materials. In this work, bilayer hollow HsGDY/NC nanotubes with controllable thickness are constructed by introducing high conductivity polydopamine (PDA) and hydrogen-substituted graphdiyne (HsGDY) followed by the etching and carbonization. Subsequently, the effects of the composition, coating order, and structural characteristics of nanotubes on the electromagnetic parameters are thoroughly investigated, thereby analyzing the microwave absorption mechanism. The impedance matching of HsGDY/NC is optimized by changing the thickness of NC layer, while utilizing unique multi-heterogeneous interfaces and hierarchical conductive structures that enhance the interface polarization and conductive loss. As a result, HsGDY@NC-3 displays the optimal absorbing performance with an effective absorption bandwidth (EAB) of 7.8 GHz (10.1–17.9 GHz) and a minimum reflection loss (RL_min) of −47.18 dB at the filler content of only 11 %. This work broadens the application scopes of HsGDY and provides a novel insight into the design of lightweight, high-efficiency, and wide-frequency microwave absorbers, which is expected to be a potentially effective microwave-absorbing material.

随着电磁环境的日益恶化，开发新型高效电磁波吸收材料显得尤为重要。在这项研究中，通过引入高导电率的聚多巴胺（PDA）和氢取代石墨二炔（HsGDY），然后进行刻蚀和碳化，构建了厚度可控的双层空心 HsGDY/NC 纳米管。随后，深入研究了纳米管的组成、涂层顺序和结构特征对电磁参数的影响，从而分析了微波吸收机理。通过改变 NC 层的厚度优化了 HsGDY/NC 的阻抗匹配，同时利用独特的多异质界面和分层导电结构增强了界面极化和导电损耗。因此，HsGDY@NC-3 显示出最佳的吸收性能，有效吸收带宽 (EAB) 为 7.8 GHz（10.1-17.9 GHz），在填料含量仅为 11% 时，最小反射损耗 (RLmin) 为 -47.18 dB。这项研究拓宽了 HsGDY 的应用范围，为轻质、高效、宽频微波吸收器的设计提供了新的见解，有望成为一种有效的微波吸收材料。

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引用次数: 0

Synergistic role of dual-metal sites (Ag–Ni) in hexagonal porous g-C3N4 nanostructures for enhanced photocatalytic CO2 reduction 六方多孔 g-C3N4 纳米结构中的双金属位点（Ag-Ni）在增强光催化二氧化碳还原中的协同作用

IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2024-10-23 DOI: 10.1016/j.carbon.2024.119735

Fahim A. Qaraah , Samah A. Mahyoub , Haochen Shen , Xiaohong Yin , Abdulwahab Salah , Sagheer A. Onaizi , Qasem A. Drmosh , Feng Xin

Harnessing solar energy to convert CO₂ into hydrocarbon fuels presents a viable strategy for mitigating CO₂ emissions. For effective photocatalytic CO₂ reduction (PCR), it is crucial to optimize both photoinduced and chemical reactions synergistically. In this research, hexagonal porous g-C₃N₄ (CN) nanostructures with Ag–Ni dual metal site loadings were synthesized using a hydrothermal method followed by calcination, significantly enhancing PCR efficiency. The optimal results demonstrated significant production rates of 77.65 μmol/g for CO and 17.89 μmol/g for CH₄, showcasing exceptional photocatalytic performance. This enhanced performance is attributed to several factors: the high porosity of the g-C₃N₄, the synergistic effects at the Ag–Ni dual metal sites, and the increased surface area. Detailed experimental measurements, coupled with comprehensive density functional theory (DFT) calculations, have elucidated the mechanisms underlying the significant improvements in the photocatalytic activity of the developed catalyst. This study not only demonstrates an effective approach for converting CO₂ into valuable hydrocarbon fuels but also significantly advances our understanding of complex photocatalytic systems, providing insights that could guide future developments in this field.

利用太阳能将二氧化碳转化为碳氢化合物燃料是减少二氧化碳排放的可行策略。要实现有效的光催化二氧化碳还原（PCR），优化光诱导反应和化学反应的协同作用至关重要。本研究采用水热法和煅烧法合成了具有 Ag-Ni 双金属位点负载的六边形多孔 g-C₃N₄ (CN) 纳米结构，显著提高了 PCR 的效率。最佳结果表明，CO 和 CH4 的生产率分别达到 77.65 μmol/g 和 17.89 μmol/g，显示出卓越的光催化性能。性能的提高可归因于几个因素：g-C₃N₄ 的高孔隙率、Ag-Ni 双金属位点的协同效应以及表面积的增加。详细的实验测量结果与全面的密度泛函理论（DFT）计算相结合，阐明了所开发催化剂光催化活性显著提高的内在机理。这项研究不仅展示了将 CO₂ 转化为有价值的碳氢化合物燃料的有效方法，还极大地推动了我们对复杂光催化系统的理解，为该领域的未来发展提供了指导。

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引用次数: 0

Interlayer growth of magnetic nanocomponent in Ti3C2Tx MXene EMW absorbers for periodic electromagnetic synergetic network 用于周期性电磁协同网络的 Ti3C2Tx MXene 电磁波吸收器中的磁性纳米成分层间生长

IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2024-10-23 DOI: 10.1016/j.carbon.2024.119741

Yongpeng Wu , Chaolong Chen , Fei Pan , Xiang Li , Wei Lu

Transition metal carbides/carbonitrides (MXene) exhibit huge potential as electromagnetic wave (EMW) absorbers in dealing with electromagnetic radiation problem that rise due to the rapid development of 5G era. The incorporation of magnetic materials can effectively mitigate the impedance mismatch and singular loss mechanisms inherent in pure MXenes (PMs). However, challenges persist due to issues such as random distribution, complex preparation processes, and inadequate interaction. In this study, Ti₃C₂T_x/Ni hybrids were synthesized using a one-pot method, wherein Ni, derived from molten salt, replaces Al layer of MXene, facilitating the in-situ growth of Ni nanocomponents within the interlayered region. The periodic electromagnetic synergetic network of “MXene-Ni-MXene-Ni-MXene” provides substantial magnetic resonance, eddy current loss, interface polarization, defect polarization, and dipole polarization, enriching the loss mechanism. By regulating the concentration of Ni, the intrinsic poor impedance matching of MXene was improved. Consequently, Ti₃C₂T_x/Ni hybrid exhibited exceptional electromagnetic wave absorption (EMA) performance, achieving a reflection loss (RL) of −64.51 dB and an effective absorption bandwidth (EAB) of 4.96 GHz at a matching thickness of 1.98 mm. Additionally, the super radar cross-section (RCS value = −15.73 dB m²) endow it potential in practical application. This work provides a facile method for achieving unique electromagnetic synergetic loss mechanism, thus paving the way for exploring high-efficient MXene-based EMW absorbers.

过渡金属碳化物/碳氮化物（MXene）作为电磁波（EMW）吸收体，在应对因 5G 时代的快速发展而出现的电磁辐射问题方面展现出巨大潜力。磁性材料的加入可以有效缓解纯 MXenes（PM）固有的阻抗失配和奇异损耗机制。然而，由于随机分布、复杂的制备过程和不充分的相互作用等问题，挑战依然存在。在本研究中，采用一锅法合成了 Ti3C2Tx/Ni 混合材料，其中从熔盐中提取的镍取代了 MXene 的铝层，促进了镍纳米成分在层间区域的原位生长。MXene-Ni-MXene-Ni-MXene "的周期性电磁协同网络提供了大量的磁共振、涡流损耗、界面极化、缺陷极化和偶极极化，丰富了损耗机制。通过调节镍的浓度，改善了 MXene 固有的阻抗匹配性差的问题。因此，Ti3C2Tx/Ni 混合材料表现出优异的电磁波吸收（EMA）性能，在匹配厚度为 1.98 mm 时，反射损耗（RL）达到 -64.51 dB，有效吸收带宽（EAB）达到 4.96 GHz。此外，超强的雷达截面（RCS 值 = -15.73 dB m2）也赋予了它在实际应用中的潜力。这项研究为实现独特的电磁协同损耗机制提供了一种简便的方法，从而为探索基于 MXene 的高效电磁波吸收器铺平了道路。

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引用次数: 0

Biomass-derived hard carbon material for high-capacity sodium-ion battery anode through structure regulation 通过结构调整将生物质衍生硬碳材料用于高容量钠离子电池负极

IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2024-10-22 DOI: 10.1016/j.carbon.2024.119733

Li Zhou , Yongpeng Cui , Pengchao Niu , Lina Ge , Rumeng Zheng , Shihao Liang , Wei Xing

Economical and environmentally friendly hard carbon materials are attractive options for high-performance sodium-ion battery anode materials. Biomass-derived hard carbon materials have good economic benefits and environmentally friendliness as anode materials for sodium-ion batteries. In this work, we propose a new hard carbon material prepared from agricultural waste olive shells through a simple and environmentally friendly process. The effects of high-temperature treatments and pre-carbonization strategies on the pore structure and graphitization degree of the hard carbon materials were investigated. Combined with electrochemical performance tests, the influence of structural changes on the sodium storage properties of the olive shell-derived hard carbon was revealed. Under the optimized conditions of carbonization temperature and pre-carbonization strategy, the OSHC-Air electrode exhibits excellent sodium storage capacity with 87 % capacity remaining after 1000 cycles at 1000 mA g⁻¹. The assembled PB//OSHC-Air sodium-ion full cell exhibits a high capacity of 216 mAh g⁻¹. Our research provides a potential candidate for commercial anode materials for high-capacity sodium-ion batteries.

经济环保的硬碳材料是高性能钠离子电池负极材料的诱人选择。生物质衍生硬碳材料作为钠离子电池负极材料具有良好的经济效益和环境友好性。在这项工作中，我们提出了一种由农业废弃物橄榄壳通过简单、环保的工艺制备而成的新型硬碳材料。研究了高温处理和预碳化策略对硬碳材料孔隙结构和石墨化程度的影响。结合电化学性能测试，揭示了结构变化对橄榄壳衍生硬碳的钠储存性能的影响。在碳化温度和预碳化策略的优化条件下，OSHC-Air 电极表现出优异的储钠能力，在 1000 mA g-1 下循环 1000 次后，剩余容量为 87%。组装后的 PB//OSHC-Air 钠离子全电池的容量高达 216 mAh g-1。我们的研究为高容量钠离子电池的商用负极材料提供了潜在的候选材料。

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引用次数: 0

Determination of surface free energy and acido-basicity of MXene materials measured by inverse gas chromatography at infinite dilution 用无限稀释的反气相色谱法测定 MXene 材料的表面自由能和酸碱性

IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2024-10-22 DOI: 10.1016/j.carbon.2024.119732

Bing-Zhi Guo , Su-Bin Kim , Seul-Yi Lee , Soo-Jin Park

Since the seminal report of Ti₃C₂T_x in 2011, MXene has emerged as a subject of considerable interest among researchers, finding diverse applications spanning energy storage, catalysis, and coatings. Despite extensive studies on the physicochemical properties of MXene, a comprehensive understanding of its surface energetics, free from environmental influences or external substitutes, remains lacking. This study aims to fill this gap by employing the inverse gas chromatography (IGC) technique at infinite dilution to delineate the London dispersive and specific components, alongside the Lewis acid-base characters, of surface free energy in MXene materials, including MAX phase and MXene. Our findings reveal that the London dispersive surface energy values of MAX phase and MXene range from 59.3 to 80.2 mJ m⁻² and 107.8–119.9 mJ m⁻², respectively, across temperature ranges of 303–333 K and 393–423 K. The observed augmentation in surface energy for MXene is attributed to a higher density of non-polar surface groups and an enlarged interlayer spacing. Additionally, our analysis indicates significantly higher acceptor (

K_{A}

) and donor (

K_{D}

) parameters for MXene (0.97 and 1.97, respectively) compared to MAX phase (0.41 and 0.63, respectively), suggesting a preference for the Lewis acid-base character in both materials, with MXene exhibiting a more pronounced tendency. These findings offer crucial insights into the fundamental surface energetic characteristics underlying multiple physicochemical properties of MXene. This understanding facilitates the informed design of interface engineering strategies, advancing the exploration and advancement of MXene-based technologies across a broad spectrum of applications.

自 2011 年发表有关 Ti3C2Tx 的开创性报告以来，MXene 已成为研究人员相当感兴趣的课题，并在能源储存、催化和涂层等领域找到了多种应用。尽管对 MXene 的物理化学特性进行了广泛的研究，但对其不受环境影响或外部替代物影响的表面能量仍缺乏全面的了解。本研究旨在填补这一空白，采用无限稀释的反气相色谱（IGC）技术，除路易斯酸碱特性外，还对 MXene 材料（包括 MAX 相和 MXene）表面自由能的伦敦色散和特定成分进行了描述。我们的研究结果表明，在 303-333 K 和 393-423 K 的温度范围内，MAX 相和 MXene 的伦敦色散表面能值分别为 59.3 至 80.2 mJ m-2 和 107.8-119.9 mJ m-2。此外，我们的分析表明，与 MAX 相（分别为 0.41 和 0.63）相比，MXene 的受体（KA）和供体（KD）参数（分别为 0.97 和 1.97）明显更高，这表明两种材料都更倾向于路易斯酸碱特性，而 MXene 表现出更明显的倾向。这些发现为了解 MXene 多种物理化学特性背后的基本表面能特性提供了重要的启示。这种认识有助于设计明智的界面工程策略，推动基于 MXene 的技术在广泛应用中的探索和进步。

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引用次数: 0

Highly interweaved carbonaceous interlayer synchronously decorated by foreign atoms and metals for adsorbing and catalyzing polysulfides in lithium-sulfur batteries 外来原子和金属同步装饰的高交织碳质中间膜，用于吸附和催化锂硫电池中的多硫化物

IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2024-10-22 DOI: 10.1016/j.carbon.2024.119739

Yang Huang , Jiaqi Xu , Xi Chen , Yihong Liu , Hainan Wang , Weiya Wang , Yue Liu , Ying Zhao , Haiyan Wei

A highly interweaved carbonized bacterial cellulose (CBC) decorated by heteroatoms and metallic nanoparticles was fabricated through initial coating of a metallic coordination polymer onto BC nanofibers followed by carbonization. The carbonaceous CBC networks not only efficiently transfer electrons but also entrap the soluble polysulfides by physical interception. Moreover, the polar ingredients of foreign atoms and metals on CBC networks enable a favorable chemisorption toward polysulfides, and meanwhile the embedded metallic nanoparticles promote the conversion kinetics via electrocatalysis. Theoretical simulation and experimental investigation co-confirm that the decorated Ni species greatly enhance the adsorption capability towards polysulfides, as well as reduce the energy barrier of the rate-determining step via electrocatalysis. As a consequence, the lithium-sulfur batteries equipped with the optimal Ni-NCBC interlayer exhibited relatively high specific capacity (1245 mAh g⁻¹ at 0.2 A g⁻¹), superior rate capability (820 mAh g⁻¹ at 4.0 A g⁻¹), and stable cycling performance (73.2 % capacity retention after 1000 cycles). This work proposes a facile strategy to synchronously incorporate heteroatoms and metallic decorations into highly conductive nanofibrous networks for alleviating the shuttling effects of polysulfides effectively.

通过在碱性纤维素纳米纤维上涂覆金属配位聚合物，然后进行碳化，制备出了由杂质原子和金属纳米颗粒装饰的高度交织的碳化细菌纤维素（CBC）。碳质 CBC 网络不仅能有效转移电子，还能通过物理拦截捕获可溶性多硫化物。此外，CBC 网络上的外来原子和金属的极性成分能够对多硫化物产生有利的化学吸附作用，同时嵌入的金属纳米颗粒通过电催化促进了转化动力学。理论模拟和实验研究共同证实，装饰的镍物种大大增强了对多硫化物的吸附能力，并通过电催化降低了决定速率步骤的能量障碍。因此，配备了最佳镍-NCBC 中间膜的锂硫电池表现出相对较高的比容量（0.2 A g-1 时为 1245 mAh g-1）、卓越的速率能力（4.0 A g-1 时为 820 mAh g-1）和稳定的循环性能（1000 次循环后容量保持率为 73.2%）。这项研究提出了一种将杂质原子和金属装饰同步融入高导电性纳米纤维网络的简便策略，可有效缓解多硫化物的穿梭效应。

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引用次数: 0

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