Carbon最新文献 - Book学术

A perspective on the electromagnetic interference shielding behavior of nickel-coated filamentary carbons 镀镍丝状碳的电磁干扰屏蔽性能研究进展

IF 10.5 2区材料科学

Carbon Pub Date : 2025-07-11 DOI: 10.1016/j.carbon.2025.120604

D.D.L. Chung

{"title":"A perspective on the electromagnetic interference shielding behavior of nickel-coated filamentary carbons","authors":"D.D.L. Chung","doi":"10.1016/j.carbon.2025.120604","DOIUrl":"10.1016/j.carbon.2025.120604","url":null,"abstract":"<div><div>This perspective provides a critical review of the electromagnetic interference (EMI) shielding behavior of nickel-coated filamentary carbons, including carbon fiber (CF), carbon nanofiber (CNF) and carbon nanotube (CNT). The nickel coating decreases the resistivity and provides magnetic character, which enhances shielding through absorption. The absorption loss <em>SE</em><sub>A</sub> dominates over the reflection loss <em>SE</em><sub>R</sub>. The CF can be continuous or discontinuous, whereas CNF and CNT are discontinuous. The continuous CF gives higher shielding effectiveness than discontinuous CF. Even without the nickel coating, continuous CF composites exhibit shielding effectiveness as high as 125 dB (1–2 GHz), which approaches the measurement limit and is higher than that of any discontinuous form of nickel-coated filamentary carbon. Preferred orientation of the discontinuous CF can be achieved by magnetic field application. Continuous CF is amenable to precise orientation control, including planar coil and linear configurations. The planar coil configuration accentuates the positive effect of the nickel coating on the shielding. The CNF and CNT are attractive for their high specific surface area, which enhances shielding because of the skin effect. Among the discontinuous filamentary carbons, nickel-coated CNF gives the highest shielding effectiveness of 87 dB (1–2 GHz). This material contains 94.4 vol% Ni, with diameter 0.4 μm and CNF core diameter 0.1 μm. The highest shielding effectiveness provided by nickel-coated CNT is 69 dB (8 GHz), compared to 50 dB without the coating. The highest shielding effectiveness provided by nickel-coated discontinuous CF is 80 dB (0.03–1.2 GHz).</div></div>","PeriodicalId":262,"journal":{"name":"Carbon","volume":"243 ","pages":"Article 120604"},"PeriodicalIF":10.5,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144614330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Phosphoric acid deconstruction of lignocellulose structure enables an ultra-wide plateau capacity in hard carbon anode 磷酸分解木质纤维素结构使硬碳阳极具有超宽平台容量

IF 10.5 2区材料科学

Carbon Pub Date : 2025-07-05 DOI: 10.1016/j.carbon.2025.120597

Jinbei Zhan , Yefeng Feng , Yu'an Lin , Weijie Liang , Le Wang , Zuyong Feng , Deping Xiong , Miao He

{"title":"Phosphoric acid deconstruction of lignocellulose structure enables an ultra-wide plateau capacity in hard carbon anode","authors":"Jinbei Zhan , Yefeng Feng , Yu'an Lin , Weijie Liang , Le Wang , Zuyong Feng , Deping Xiong , Miao He","doi":"10.1016/j.carbon.2025.120597","DOIUrl":"10.1016/j.carbon.2025.120597","url":null,"abstract":"<div><div>Biomass-derived hard carbon, thanks to its natural advantages as an anode material for sodium-ion batteries (SIBs), has been receiving growing attention. However, the structure and performance of hard carbon can vary remarkably depending on the precursor materials and carbonization processes used. Thus, how to regulate the structure of biomass materials to achieve superior properties remains an open question. In this study, we propose a design for a porous, biomass-derived hard carbon anode material featuring a broad low-voltage plateau, high capacity, and excellent stability. Walnut shells serve as the biomass precursor, while phosphoric acid acts as both the regulator and dopant. Phosphoric acid promotes the disruption of microfibrillar crystalline regions and etches the tight structures of lignin and hemicellulose, developing more and larger enclosed pore spaces. The material carbonized at 1500 °C demonstrates a high capacity of 422 mAh g<sup>−1</sup> and a wide plateau capacity of 322 mAh g<sup>−1</sup> at 20 mA g<sup>−1</sup>, with an initial coulombic efficiency (ICE) reaching 93.99 %. Importantly, the optimized hard carbon displays a higher plateau capacity, achieving an increase of 192 mAh g<sup>−1</sup> over directly carbonized hard carbon. This represents nearly double the capacity of the directly carbonized material. This simple and reliable method offers an easy-to-implement route for mass production of high-capacity, biomass-derived hard carbon for use in SIBs.</div></div>","PeriodicalId":262,"journal":{"name":"Carbon","volume":"243 ","pages":"Article 120597"},"PeriodicalIF":10.5,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144571943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation of salt-resistant carbon dots-based nanofluids from coal tar pitch and their properties for enhanced oil recovery 煤焦油沥青制备耐盐碳点纳米流体及其提高采收率性能

IF 10.5 2区材料科学

Carbon Pub Date : 2025-07-04 DOI: 10.1016/j.carbon.2025.120596

Shijie Yang , Juan Wu , Lu Lai , Tengfei Wang , Ping Mei

{"title":"Preparation of salt-resistant carbon dots-based nanofluids from coal tar pitch and their properties for enhanced oil recovery","authors":"Shijie Yang , Juan Wu , Lu Lai , Tengfei Wang , Ping Mei","doi":"10.1016/j.carbon.2025.120596","DOIUrl":"10.1016/j.carbon.2025.120596","url":null,"abstract":"<div><div>Nanomaterials are important enhancers for low-permeability reservoir engineering, while conventional nanomaterials still face limitations in size distribution, stability, and environmental compatibility. To address these challenges, the coal tar pitch (CTP), a low-cost by-product of coal chemical industry, was used as a carbon precursor to prepare coal tar pitch-based carbon dots (CTP-CDs, 2.61 ± 0.3 nm) with high stability, graphitized structure, and rich in carboxyl and hydroxyl groups through oxidation and hydrothermal methods, achieving high-value conversion of industrial waste. Structural characterization analysis through Fourier-transform infrared (FT-IR) peak deconvolution, X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD) reveals a carbonization pathway dominated by polyaromatic core condensation and periphery oxidation. The CTP-CDs were further mixed with sodium fatty alcohol polyoxyethylene ether carboxylate (AEC-9Na), which achieved the synergistic enhancement of interfacial activity, wetting control, and enhanced oil recovery (EOR) efficiency. The AEC-9Na/CTP-CDs system (<em>ω</em><sub>CTP-CDs</sub> = 0.5, <em>c</em> = 500 mg/L) can reduce the toluene-water interfacial tension to 0.66 mN/m at the salinity of 200,000 mg/L. The mixed system remains stable at the salinity of 300,000 mg/L or pH = 13, and the oil-wet glass contact angle decreases from 106.0° to 64.3°. It enhances oil recovery through the dual mechanism of “oil film removal-emulsification\", and the crude oil recovery rate is increased by 17.4 %. This study provides a theoretical basis for the development of carbon-based nanofluids in low-permeability reservoirs and has important engineering value for realizing the resource utilization of coal-based solid waste.</div></div>","PeriodicalId":262,"journal":{"name":"Carbon","volume":"243 ","pages":"Article 120596"},"PeriodicalIF":10.5,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144570144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ternary deep eutectic solvent-Mediated rapid extraction of highly crystalline cellulose enabling closed-Pore regeneration of hard carbon anode for ultrafast sodium storage 三元深共晶溶剂介导的高结晶纤维素快速萃取，实现硬碳阳极的闭孔再生，用于超快钠储存

IF 10.5 2区材料科学

Carbon Pub Date : 2025-07-03 DOI: 10.1016/j.carbon.2025.120594

Yunfei Shen, Bojian Fan, Yuhang Xin, Qingbo Zhou, Yingshuai Wang, Hui Zhou, Kunyu Zhao, Feng Wu, Hongcai Gao

{"title":"Ternary deep eutectic solvent-Mediated rapid extraction of highly crystalline cellulose enabling closed-Pore regeneration of hard carbon anode for ultrafast sodium storage","authors":"Yunfei Shen, Bojian Fan, Yuhang Xin, Qingbo Zhou, Yingshuai Wang, Hui Zhou, Kunyu Zhao, Feng Wu, Hongcai Gao","doi":"10.1016/j.carbon.2025.120594","DOIUrl":"10.1016/j.carbon.2025.120594","url":null,"abstract":"<div><div>Biomass is a high-quality precursor for synthesizing advanced hard carbon (HC) anode materials for sodium-ion batteries. The challenges of developing biomass-based hard carbon anode with excellent electrochemical performance are the regulation of closed-pore structures during the carbonization. In this work, a mild deep eutectic solvent of ChCl/EtG/H<sub>2</sub>SO<sub>4</sub> (CEH) based on ethylene glycol system is used to treat moso bamboo (MB) for the first time, which selectively dissolves most of the lignin and hemicellulose by breaking the hydrogen bonds to retain highly crystalline cellulose, thus improving the concentration of closed-pore structures in the carbonization. The as-prepared hard carbon material of CEH-MB-120/4 h possesses a rich closed-pore structure and ultrathin disordered pore walls with abundant active sites, which enables the fast ion diffusion kinetics and excellent reversibility of sodium storage. Importantly, without conductive additives, the CEH–HC–120/4 h anodes possess excellent electrochemical properties, including an impressive reversible capacity of 348.6 mAh g<sup>−1</sup> at 0.1C, outstanding rate performance of 201.4 mAh g<sup>−1</sup> at 10C and exceptional cycling stability with a capacity retention of 90 % over 300 cycles at 1C. This refined approach offers a facile manipulated pathway for designing biomass-based hard carbon anode with high capacity and rate performance for sodium-ion batteries.</div></div>","PeriodicalId":262,"journal":{"name":"Carbon","volume":"243 ","pages":"Article 120594"},"PeriodicalIF":10.5,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144549807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multi-functional highly oriented expanded graphite nanoplatelet composites enabling advanced thermal management 多功能高取向膨胀石墨纳米板复合材料实现先进的热管理

IF 10.5 2区材料科学

Carbon Pub Date : 2025-07-03 DOI: 10.1016/j.carbon.2025.120588

Wendong Liu , Yue Xu , Yuda Su , Yizhe Liu , Zhihui Lei , Peng Tao , Wen Shang , Benwei Fu , Chengyi Song , Tao Deng

{"title":"Multi-functional highly oriented expanded graphite nanoplatelet composites enabling advanced thermal management","authors":"Wendong Liu , Yue Xu , Yuda Su , Yizhe Liu , Zhihui Lei , Peng Tao , Wen Shang , Benwei Fu , Chengyi Song , Tao Deng","doi":"10.1016/j.carbon.2025.120588","DOIUrl":"10.1016/j.carbon.2025.120588","url":null,"abstract":"<div><div>This work presents that highly oriented graphite nanoplatelets-waterborne polyurethane (GNP-WPU) nanocomposites with high thermal conductivity and multi-functionality can be generated by lyophilizing and compressing expanded graphite/WPU foams. Inner effective heat pathways are constructed based on the highly oriented GNPs bonded by van der Waals interaction, and the in-plane thermal conductivity can reach up to ∼143 W <span><math><mrow><mo>·</mo></mrow></math></span> m<sup>−1</sup> <span><math><mrow><mo>·</mo></mrow></math></span> K<sup>−1</sup>. The highly oriented GNP-WPU nanocomposites exhibit superior performance as thermal interface material and heat spreader for the heat dissipation of high-power light-emitting diodes (LEDs). Additionally, the electro-thermal conversion property and electromagnetic interference (EMI) shielding effect of GNP-WPU endow it with multi-functional usage in modern electronics. In extremely cold weather, the heat generated by applying voltage to electrically conductive GNP-WPU keeps electronics warm. The intrinsic electrical conductivity and layered structure of the films lead to EMI shielding effectiveness of 112 dB with the use of the GNP-70 wt%-WPU film with a thickness of 370 <span><math><mrow><mi>μ</mi></mrow></math></span> m. Furthermore, the addition of flame retardant enables GNP-WPU nanocomposite to self-extinguish in thermal management applications, thus electronics can operate safely. With high thermal conductivity and multi-functionality, GNP-WPU nanocomposites proposed in this work show great potential in advanced thermal management, aerospace crafts, flexible electronics, soft robots, and energy conversion systems.</div></div>","PeriodicalId":262,"journal":{"name":"Carbon","volume":"243 ","pages":"Article 120588"},"PeriodicalIF":10.5,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144570145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Controlling water clusters under confinement in a graphene oxide matrix 在氧化石墨烯基体中控制水团簇

IF 10.5 2区材料科学

Carbon Pub Date : 2025-07-03 DOI: 10.1016/j.carbon.2025.120563

Vikas Yadav, Anjan Das, Sangram Kishor Behera, C.V. Krishnamurthy, Manu Jaiswal

{"title":"Controlling water clusters under confinement in a graphene oxide matrix","authors":"Vikas Yadav, Anjan Das, Sangram Kishor Behera, C.V. Krishnamurthy, Manu Jaiswal","doi":"10.1016/j.carbon.2025.120563","DOIUrl":"10.1016/j.carbon.2025.120563","url":null,"abstract":"<div><div>Porous materials hold water in two forms: surface-bound water and clustered water. The pore size and wall chemistry are important in determining the water clustering. Graphene oxide (GO) is unique because its dynamic pores, in the form of sub-nanometer interlayer spaces, can expand upon water intercalation. In this work, we investigate the water-cluster formation using temperature-dependent water sorption isotherms complemented with chemical analysis. We have demonstrated that the size of water clusters is largely independent of the oxidative state of the wall surfaces, for C: O ratio <span><math><mrow><mo>≈</mo><mn>2</mn><mo>.</mo><mn>5</mn><mo>−</mo><mn>5</mn><mo>.</mo><mn>1</mn></mrow></math></span>. However, crosslinking the GO sheets with an amine binder severely quenches the water clustering even though the primary sites are well populated. The critical cluster size around an adsorbed water molecule diminishes from <span><math><mrow><mo>≈</mo><mn>1</mn><mo>.</mo><mn>6</mn></mrow></math></span> to 0.1 for the crosslinked system. We attribute this effect to a restricted expansion of the spacing between the graphene oxide sheets and a dense network of linkages in the space between the sheets.</div></div>","PeriodicalId":262,"journal":{"name":"Carbon","volume":"243 ","pages":"Article 120563"},"PeriodicalIF":10.5,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144556792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Carbon dots inspired upgradable hierarchical carbon for enhanced tetracycline adsorption 碳点启发可升级的分层碳增强四环素吸附

IF 10.5 2区材料科学

Carbon Pub Date : 2025-07-03 DOI: 10.1016/j.carbon.2025.120595

Chun Yang , Yinhai Su , Huiyan Zhang

{"title":"Carbon dots inspired upgradable hierarchical carbon for enhanced tetracycline adsorption","authors":"Chun Yang , Yinhai Su , Huiyan Zhang","doi":"10.1016/j.carbon.2025.120595","DOIUrl":"10.1016/j.carbon.2025.120595","url":null,"abstract":"<div><div>Lignin, a bulk waste byproduct from biorefining processes, possesses complex macromolecular structures that resist dissociation during thermal conversion. However, its propensity for condensation and carbonization makes it suitable for carbon material preparation. Nevertheless, the amorphous nature of lignin causes melting and flow during heating, which covers newly formed pores and results in underdeveloped pore structures in the resulting hierarchical carbons. In this study, an innovative pre-carbonization engineering strategy was proposed to break this barrier. By purposeful re-carbonization, partial lignin macromolecules were induced to form numerous micro-carbon dots, which effectively blocks the melting and flowing of lignin when heating, preventing the covering of newborn pores. The unstable interface between the carbonized phase and the lignin phase provides more active sites for pore development. Characterization results showed that the prepared carbon material exhibited hierarchical pore structure with an extremely high specific surface area. Furthermore, the optimal sample possessed the maximum BET surface area and adsorption capacity for tetracycline as 2246 m<sup>2</sup>/g and 1196 mg/g, representing 42.77 % and 23.15 % enhancements respectively compared to hierarchical carbon derived from raw lignin. In conclusion, the lignin-based hierarchical carbon material developed in this study provides a simple, economical, and efficient method for the removal of antibiotics in wastewater treatment, contributing to water pollution control.</div></div>","PeriodicalId":262,"journal":{"name":"Carbon","volume":"243 ","pages":"Article 120595"},"PeriodicalIF":10.5,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144562978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rapid joule-heating-driven synthesis of FeCo alloy nanoparticles embedded in porous carbon nanorods for electromagnetic wave absorption 快速焦耳加热合成嵌入多孔碳纳米棒的feo合金纳米颗粒用于电磁波吸收

IF 10.5 2区材料科学

Carbon Pub Date : 2025-07-02 DOI: 10.1016/j.carbon.2025.120592

Letian Huang , Chunhui Bai , Jinyu Jia , Yujin Chen , Chunling Zhu , Xinzhi Ma , Xiao Zhang

{"title":"Rapid joule-heating-driven synthesis of FeCo alloy nanoparticles embedded in porous carbon nanorods for electromagnetic wave absorption","authors":"Letian Huang , Chunhui Bai , Jinyu Jia , Yujin Chen , Chunling Zhu , Xinzhi Ma , Xiao Zhang","doi":"10.1016/j.carbon.2025.120592","DOIUrl":"10.1016/j.carbon.2025.120592","url":null,"abstract":"<div><div>Magnetic carbon-based composites exhibited enhanced electromagnetic wave (EMW) absorption performance; however, their fabrications through conventional annealing methods need a relatively long time. Herein, FeCo alloy nanoparticles (NPs) embedded in porous carbon nanorods are synthesized through a rapid Joule heating method within 10 s. The ∼170-nm-FeCo NPs encapsulated in graphene layers are embedded in porous carbon nanorods with a diameter of around 500 nm. Density functional theory (DFT) calculations and experimental results show that the orbital hybridization of Fe and Co atoms can adjust the d-band center and induce magnetic coupling effects, while the charge redistribution at the interfaces between FeCo alloys and the graphene layers enhances dielectric loss. In addition, the structural features, including porous and one-dimensional structures, synergistically improve EMW absorption performance. Consequently, the optimal FeCo-CNRs achieve an effective absorption bandwidth (EAB) of 6.08 GHz at a matching thickness of only 1.9 mm, outperforming single counterparts and most of the reported magnetic carbon-based absorbers. This work aims to provide a rapid approach for developing magnetic carbon composites for high-performance EMW absorption.</div></div>","PeriodicalId":262,"journal":{"name":"Carbon","volume":"243 ","pages":"Article 120592"},"PeriodicalIF":10.5,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144562977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Flash-Joule-heating enhancing electromagnetic absorption performance of cobalt polyphthalocyanine complex derived 2D Co/C nanocomposite 闪现焦耳加热增强聚酞菁钴络合物衍生的二维Co/C纳米复合材料的电磁吸收性能

IF 10.5 2区材料科学

Carbon Pub Date : 2025-07-02 DOI: 10.1016/j.carbon.2025.120593

Tiancong Hao , Yuhang Liu , Wenyu Li , Xiaoning Yang , Xiongfei Liu , Qingya Sun , Shifei Tao , Aming Xie , Guowei Ma

{"title":"Flash-Joule-heating enhancing electromagnetic absorption performance of cobalt polyphthalocyanine complex derived 2D Co/C nanocomposite","authors":"Tiancong Hao , Yuhang Liu , Wenyu Li , Xiaoning Yang , Xiongfei Liu , Qingya Sun , Shifei Tao , Aming Xie , Guowei Ma","doi":"10.1016/j.carbon.2025.120593","DOIUrl":"10.1016/j.carbon.2025.120593","url":null,"abstract":"<div><div>Conventional carbonization methodologies employed in the synthesis of carbon-based nanocomposites are frequently compromised by structural imperfections, which substantially diminish electromagnetic wave attenuation capabilities. To address this limitation, we herein propose a Flash-Joule-Heating (FJH) treatment strategy for microstructural refinement of 2D Co/C nanocomposite. After FJH treatment, it is revealed that the graphitization, structural ordering, and crystallinity improve remarkably. The obtained Co/C nanocomposite shows apparently enhanced electromagnetic waves absorption (EMA), where the effective absorption bandwidth broadens from 5 GHz to 6.12 GHz (a 22.4 % increase), compared to the untreated sample. The enhancing mechanism is predominantly attributed to the rebalancing of dielectric loss and a transition in the magnetic loss mechanism. This work demonstrates an effective treatment strategy for improving the microstructure and electromagnetic response of carbon-based nanocomposite, offering valuable insights into the design of high-performance EMA materials.</div></div>","PeriodicalId":262,"journal":{"name":"Carbon","volume":"243 ","pages":"Article 120593"},"PeriodicalIF":10.5,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144549808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High conductivity and low cost carbon composite hot pressed bipolar plate with gradient distribution of expanded graphite and polypropylene components 具有梯度分布的膨胀石墨和聚丙烯组分的高导电性和低成本的碳复合热压双极板

IF 10.5 2区材料科学

Carbon Pub Date : 2025-07-02 DOI: 10.1016/j.carbon.2025.120591

Qianyuan Guo, Qiaoyu Kou, Hongyu Wang, Xiangkun Ma

{"title":"High conductivity and low cost carbon composite hot pressed bipolar plate with gradient distribution of expanded graphite and polypropylene components","authors":"Qianyuan Guo, Qiaoyu Kou, Hongyu Wang, Xiangkun Ma","doi":"10.1016/j.carbon.2025.120591","DOIUrl":"10.1016/j.carbon.2025.120591","url":null,"abstract":"<div><div>(VRFB) is a leading energy storage technology due to its high safety and extended cycle life. As one of the cell stack key materials, the carbon-polymer composite hot pressed bipolar plate has a higher electric conductivity than the corresponding extruded bipolar plate because of the lower resin, which is favorable for the large scale high power density cell stack. The distribution of conductive carbon and resin significantly affects electrical conductivity, mechanical strength, and area specific resistance. Therefore, balancing these three factors has become a key research focus. This paper proposes a novel hot pressed bipolar plate with a gradient distribution of flexible conductive expanded graphite (EG) and polypropylene (PP), produced with multi-layer gradient structures via multi-pass compression molding. Replacing traditional PVDF resin with low-cost PP, the plate achieves a high electrical conductivity of 410.78 S/cm, flexural strength of 30.8 MPa, and an are specific resistance of 10.8 mΩ cm<sup>2</sup>. At a current density of 200 mA/cm<sup>2</sup>, the voltage and energy efficiencies of 83.07 % and 79.83 %, respectively. These findings demonstrate that multi-layer gradient structures effectively balance mechanical properties, electrical conductivity, and contact resistance at low cost, offering a new approach for bipolar plate material development.</div></div>","PeriodicalId":262,"journal":{"name":"Carbon","volume":"243 ","pages":"Article 120591"},"PeriodicalIF":10.5,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144562985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0