Carbon Letters最新文献_第9页

Modification of graphite-based composite bipolar plates by “nanoglue” strategy for vanadium redox flow battery 钒氧化还原液流电池用石墨基复合双极板的“纳米胶”改性

IF 5.8 3区材料科学

Carbon Letters Pub Date : 2025-02-13 DOI: 10.1007/s42823-025-00873-y

Yingbo Kang, Hai Zhang, Yinglong Weng, Xiaotong Han, Jianping Zhang, Tingting Huang, Zhefeng Li

{"title":"Modification of graphite-based composite bipolar plates by “nanoglue” strategy for vanadium redox flow battery","authors":"Yingbo Kang, Hai Zhang, Yinglong Weng, Xiaotong Han, Jianping Zhang, Tingting Huang, Zhefeng Li","doi":"10.1007/s42823-025-00873-y","DOIUrl":"10.1007/s42823-025-00873-y","url":null,"abstract":"<div><p>All-vanadium redox flow battery (VRFB) has been considered as a promising candidate for the construction of renewable energy storage system. Expanded graphite possesses immense potential for use as typical bipolar plates in VRFB stacks. Nevertheless, the pure expanded graphite bipolar plates suffer from severe swelling in electrolyte, resulting in the losses of mechanical stability and electrical conductivity, thus leading to the efficiency decay within several cycles. Herein, we present a “nanoglue” strategy for tuning the structure/surface properties of expanded graphite by employing polyvinylidene fluoride (PVDF) polymer as structural sealant. Such PVDF “nanoglue” on expanded graphite results in the fine-repairment toward the surface microcracks and cross-section edges, which is beneficial to suppress the electrolyte permeation and improve the anti-swelling capacity. Moreover, it has been found that the PVDF “nanoglue” can improve the flexibility, allowing for the fabrication of ultrathin bipolar plates (0.67 mm) with low electrical resistivity. Benefiting from these integrated characteristics, the VRFB employing the as-fabricated composite bipolar plates delivers excellent cyclic efficiencies (voltage efficiency, coulombic efficiency, and energy efficiency) and ultralow ohmic voltage loss of less than 1.1 mV (< 0.1% of the VRFB rated voltage of 1.25 V) at a high current density of 200 mA cm<sup>−2</sup>.</p></div>","PeriodicalId":506,"journal":{"name":"Carbon Letters","volume":"35 4","pages":"1589 - 1597"},"PeriodicalIF":5.8,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145165580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 nanodots derived from herbal extract ginsenoside Rg1 demonstrate highly effective inhibition against cervical carcinoma 从人参皂苷Rg1中提取的碳纳米点对宫颈癌有很好的抑制作用

IF 5.5 3区材料科学

Carbon Letters Pub Date : 2025-02-12 DOI: 10.1007/s42823-025-00877-8

Jiahui Bao, Xuechun Zhou, Xiaoyu He, Ning Tian, Zhe Zhang, Hui Peng, Changkui Fu, Tenghui Tian, Yu Zhao, Yingnan Jiang, Rui Jiang, Andrew K. Whittaker

{"title":"Carbon nanodots derived from herbal extract ginsenoside Rg1 demonstrate highly effective inhibition against cervical carcinoma","authors":"Jiahui Bao, Xuechun Zhou, Xiaoyu He, Ning Tian, Zhe Zhang, Hui Peng, Changkui Fu, Tenghui Tian, Yu Zhao, Yingnan Jiang, Rui Jiang, Andrew K. Whittaker","doi":"10.1007/s42823-025-00877-8","DOIUrl":"10.1007/s42823-025-00877-8","url":null,"abstract":"<div><p>The current standard treatment regimen for patients with cervical cancer consists of a combination of radiotherapy and chemotherapy. However, the serious side effects often encountered with chemotherapy drugs greatly limits the effective doses that can be delivered, and hence the treatment of cervical cancer still faces strong challenges. In this study, carbon nanodots, nanodrugs with anti-cervical cancer activity and with negligible toxicity, were prepared from the precursor herbal extract ginsenoside Rg1. The surface of the Rg1 carbon nanodots is rich in hydrophilic functional groups, resulting in good dispersion in aqueous media and high biocompatibility. In Vitro experiments show that the Rg1 carbon nanodots have significant cytostatic and pro-apoptotic effects on HeLa cells, and could inhibit their migration and invasion. Experiments in tumor-bearing nude mice show that the Rg1 carbon nanodots could significantly inhibit tumor growth. Through qPCR validation, the Rg1 carbon nanodots were shown to enhance HeLa cell apoptosis, by regulating the expression levels of Cyto c, Caspase-9, Caspase-3, Bax, and Bcl-2, induce G2/M phase arrest by regulating CDK 1 and Cyclin B1 expression, and inhibit tumor cell migration by modulating CDH1 and β-catenin. Since the precursor Rg1 is a natural herbal extract, negligible toxic side effects were observed in nude mice. The work demonstrates that Rg1 carbon nanodots can be expected to become a potential nanomedicine against human cervical cancer with negligible toxic side effects and excellent therapeutic effects.</p></div>","PeriodicalId":506,"journal":{"name":"Carbon Letters","volume":"35 3","pages":"1349 - 1361"},"PeriodicalIF":5.5,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144084982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Yttrium-doped MnO2/rGO composites as cathode material for ultra-long cycle life aqueous zinc-ion battery 掺钇MnO2/rGO复合材料作为超长循环寿命水性锌离子电池正极材料

IF 5.5 3区材料科学

Carbon Letters Pub Date : 2025-02-11 DOI: 10.1007/s42823-025-00858-x

Tong Wei, Song Li, Taowei Xu, Luwei Zhou, Siyuan Yin, Zhongsheng Wen, Juncai Sun

{"title":"Yttrium-doped MnO2/rGO composites as cathode material for ultra-long cycle life aqueous zinc-ion battery","authors":"Tong Wei, Song Li, Taowei Xu, Luwei Zhou, Siyuan Yin, Zhongsheng Wen, Juncai Sun","doi":"10.1007/s42823-025-00858-x","DOIUrl":"10.1007/s42823-025-00858-x","url":null,"abstract":"<div><p>Manganese dioxide, functioning as a cathode material for aqueous zinc-ion batteries (AZIBs), demonstrates a variety of benefits, such as elevated theoretical specific capacity, outstanding electrochemical performance, environmental compatibility, ample resource availability, and facile modification. These advantages make MnO<sub>2</sub> one of the cathode materials that have attracted much attention for AZIBs. Nevertheless, manganese dioxide cathode in practical applications suffers from structural instability during the cycling process because of sluggish electrochemical kinetics and volume expansion, which hinder their large-scale application. Doping and compositing with conducting frameworks is an effective strategy for improving structural stability. Herein, homogeneously in situ growth of Yttrium-doped MnO<sub>2</sub> nanorods on conductive reduced graphene oxide (Y-MnO<sub>2</sub>/rGO), were synthesized through a straightforward hydrothermal method. The Y-MnO<sub>2</sub>/rGO electrodes have an ultra-long cycle life of 179.2 mA h g<sup>−1</sup> after 2000 cycles at 1 A g<sup>−1</sup> without degradation. The excellent structural stability is attributed to the cooperative effect of yttrium doping and compositing with rGO, which is an effective approach to enhance the stability and mitigate the Jahn–Teller distortion associated with Mn ions.</p></div>","PeriodicalId":506,"journal":{"name":"Carbon Letters","volume":"35 3","pages":"1327 - 1336"},"PeriodicalIF":5.5,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144084979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

A fiber-optic sensor for in-situ detection of methanol production rate in photocatalytic CO2 reduction reaction 一种用于光催化CO2还原反应甲醇产率原位检测的光纤传感器

IF 5.5 3区材料科学

Carbon Letters Pub Date : 2025-02-11 DOI: 10.1007/s42823-025-00876-9

Shihui Wang, Yuyao Lei, Chao He, Junhe Miao, Yang Liu, Quanhua Xie, Karimi-Maleh Hassan, Nianbing Zhong

{"title":"A fiber-optic sensor for in-situ detection of methanol production rate in photocatalytic CO2 reduction reaction","authors":"Shihui Wang, Yuyao Lei, Chao He, Junhe Miao, Yang Liu, Quanhua Xie, Karimi-Maleh Hassan, Nianbing Zhong","doi":"10.1007/s42823-025-00876-9","DOIUrl":"10.1007/s42823-025-00876-9","url":null,"abstract":"<div><p>In the pursuit of achieving in-situ real-time detection of methanol production rate during the photocatalytic reduction of CO<sub>2</sub>, we developed a methanol sensor using a copolymer-coated fiber Bragg gratings. The theoretical model of methanol measurement by sensor was established. The effect of methanol-selective sensitive material and its thickness on the performance of the sensor were investigated. Humidity and temperature interference to sensor measurements was compensated. Furthermore, TiO<sub>2</sub> photocatalyst was prepared and the photocatalytic reactor was constructed. The methanol production rate in the photocatalytic CO<sub>2</sub> reduction process was monitored by the prepared sensor in-situ. The results highlight that the fiber Bragg grating methanol sensor with 600 nm-thick poly(N-isopropylacrylamide)/polymethyl-methacrylate coating showed a high sensitivity, lower limit of detection, fast response and recovery speed, and high selectivity. The methanol generation rate of TiO<sub>2</sub> photocatalytic reduction of CO<sub>2</sub> measured by gas chromatograph and prepared fiber Bragg grating methanol sensor was 1.42 and 1.53 μmol/g-cat·h, respectively, the error of the two detection methods was 7.86%. This highlights the efficacy of the developed fiber Bragg grating methanol sensor for real-time in-situ detection of the methanol production rate during the photocatalytic reduction of CO<sub>2</sub>.</p></div>","PeriodicalId":506,"journal":{"name":"Carbon Letters","volume":"35 3","pages":"1337 - 1347"},"PeriodicalIF":5.5,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144084980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Development and evaluation of machine-learned interatomic potentials for carbon nanotubes for molecular dynamics simulations 用于分子动力学模拟的碳纳米管的机器学习原子间势的发展和评价

IF 5.5 3区材料科学

Carbon Letters Pub Date : 2025-02-09 DOI: 10.1007/s42823-025-00867-w

Vijay Choyal, Saurabh Mishra, Nitin Luhadiya, S. I. Kundalwal

{"title":"Development and evaluation of machine-learned interatomic potentials for carbon nanotubes for molecular dynamics simulations","authors":"Vijay Choyal, Saurabh Mishra, Nitin Luhadiya, S. I. Kundalwal","doi":"10.1007/s42823-025-00867-w","DOIUrl":"10.1007/s42823-025-00867-w","url":null,"abstract":"<div><p>The prime objective of this computational study was to develop a highly accurate potential for the use of molecular dynamics (MD) simulations of carbon nanotubes (CNTs). This potential was generated using ab initio MD (AIMD) simulations based on density functional theory (DFT). Subsequently, we constructed machine-learned interatomic potentials (MLIPs) based on moment tensor potential (MTP) descriptors using AIMD trajectories as training data. The performance of the developed MLIPs was evaluated by conducting the MD simulations of the stress–strain responses of single-walled CNTs (SWCNTs) and defected SWCNTs (D-SWCNTs) under tensile loading. Furthermore, this work includes extensive MLIP-based MD simulations to examine the influence of diameter and chirality, temperature, and defect concentration on the fracture characteristics and Young’s modulus of SWCNTs. The findings demonstrate the computational reliability and transferability of the MLIPs in predicting the mechanical properties of SWCNTs through MD simulations performed over a temperature range of 1 K to 2000 K. The observed stiffnesses correspond to Young’s modulus ranging from 1.61–0.53 TPa with a mean value of 0.936 TPa for different SWCNTs with diameters ranging from 1.1–2.89 nm and temperatures spanning from 1 to 2000 K, exhibiting a noticeable dependence on chirality.</p></div>","PeriodicalId":506,"journal":{"name":"Carbon Letters","volume":"35 3","pages":"1311 - 1326"},"PeriodicalIF":5.5,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144084955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

MWCNT-OH/graphene composite sensor for nonenzymatic detection of paraoxon-ethyl in agricultural samples MWCNT-OH/石墨烯复合传感器非酶检测农业样品中对氧磷乙基

IF 5.5 3区材料科学

Carbon Letters Pub Date : 2025-02-05 DOI: 10.1007/s42823-025-00868-9

Budi Riza Putra, Elda Nurwidayanti, Siti Fadilah, Munawar Khalil, Erus Rustami, Wulan Tri Wahyuni

{"title":"MWCNT-OH/graphene composite sensor for nonenzymatic detection of paraoxon-ethyl in agricultural samples","authors":"Budi Riza Putra, Elda Nurwidayanti, Siti Fadilah, Munawar Khalil, Erus Rustami, Wulan Tri Wahyuni","doi":"10.1007/s42823-025-00868-9","DOIUrl":"10.1007/s42823-025-00868-9","url":null,"abstract":"<div><p>In this study, we developed electrochemical sensors based on the composite of hydroxylated multiwalled carbon nanotubes (MWCNT-OH) and graphene for paraoxon-ethyl detection as pesticide residues in agricultural products. Chemical treatment was employed to produce MWCNT-OH from pristine MWCNT and its composite with graphene was subsequently characterized using FTIR, Raman spectroscopy, FESEM-EDX, TEM, and XPS techniques. The MWCNT-OH/graphene composite was employed as an electrode modifier on the glassy carbon electrode (GCE) surface, and its electroanalytical performances were studied using differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS) techniques. It was revealed the optimum composition ratio between MWCNT-OH and graphene was 2:8, for paraoxon-ethyl detection at pH 7. This could be attributed to the enhanced electrocatalytic activity in the MWCNT-OH/graphene composite which displayed a linear range of paraoxon-ethyl concentration as 0.1–100 µM with a lower detection limit of 10 nM and a good sensitivity of 1.60 µA µM cm<sup>−2</sup>. In addition, the proposed sensor shows good reproducibility, stability, and selectivity in the presence of 10 different interfering compounds including other pesticides. Ultimately, this proposed sensor was tested to determine the paraoxon-ethyl concentrations in green apples and cabbage as samples of agricultural products. The obtained concentrations of paraoxon-ethyl from this proposed sensor show no significant difference with standard spectrophotometric techniques suggesting this sensing platform might be further developed as a rapid detection of pesticide residue in agricultural products.</p></div>","PeriodicalId":506,"journal":{"name":"Carbon Letters","volume":"35 3","pages":"1291 - 1310"},"PeriodicalIF":5.5,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144084899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Optimization of conductive cyclized polyacrylonitrile content to enhance the structural stability of single-crystal LiNi0.8Co0.1Mn0.1O2 cathode materials for lithium-ion batteries 优化导电环化聚丙烯腈含量，提高单晶LiNi0.8Co0.1Mn0.1O2锂离子电池正极材料的结构稳定性

IF 5.5 3区材料科学

Carbon Letters Pub Date : 2025-01-31 DOI: 10.1007/s42823-024-00852-9

Minyue Wen, Sheng Wang, Jiawen Wang, Jiafu Yu, Shuaihao Li, Qiuyu Zeng

{"title":"Optimization of conductive cyclized polyacrylonitrile content to enhance the structural stability of single-crystal LiNi0.8Co0.1Mn0.1O2 cathode materials for lithium-ion batteries","authors":"Minyue Wen, Sheng Wang, Jiawen Wang, Jiafu Yu, Shuaihao Li, Qiuyu Zeng","doi":"10.1007/s42823-024-00852-9","DOIUrl":"10.1007/s42823-024-00852-9","url":null,"abstract":"<div><p>To optimize the electrochemical properties of Ni-rich cathode materials, CPAN@SC-NCM811 is prepared via surface modification of single-crystalline LiNi<sub>0.8</sub>Co<sub>0.1</sub>Mn<sub>0.1</sub>O<sub>2</sub> cathode material by adding 1, 2 and 3 wt.% of polyacrylonitrile, respectively. Significantly, the results obtained from X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM) verify the successful synthesis of CPAN@SC-NCM811 cathode, which exhibits better electrochemical properties compared to SC-NMC811. After thorough milling and calcination of 2 wt.% polyacrylonitrile with SC-NCM811, the initial discharge specific capacity of prepared S2 sample is 197.7 mAh g<sup>−1</sup> and the capacity retention reached 89.2% after 100 cycles at a rate of 1.0 C. Furthermore, the S2 sample exhibits superior rate performance compared to the other three samples, in which these superior electrochemical properties are largely attributed to the optimal ratio of conductive cyclized polyacrylonitrile coatings. Overall, this work offers guidelines for modifying the surface of SC-NCM811 cathode materials for lithium-ion batteries with exceptional cycling and rate performance.</p><h3>Graphical abstract</h3><p>Preparation schematic of the CPAN@SC-NCM811 cathode materials and the corresponding cycling performance of the assembled coin cells</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":506,"journal":{"name":"Carbon Letters","volume":"35 3","pages":"1285 - 1290"},"PeriodicalIF":5.5,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144085031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Influence of sulfur promoter on electrical conductivity in direct-spun carbon nanotube fibers 硫促进剂对直纺碳纳米管纤维电导率的影响

IF 5.5 3区材料科学

Carbon Letters Pub Date : 2025-01-29 DOI: 10.1007/s42823-025-00859-w

Ho Jun Moon, Sumin Kim, Myeong Wan Han, Yoong Ahm Kim, Moo-Sung Lee, Jong Hun Han

{"title":"Influence of sulfur promoter on electrical conductivity in direct-spun carbon nanotube fibers","authors":"Ho Jun Moon, Sumin Kim, Myeong Wan Han, Yoong Ahm Kim, Moo-Sung Lee, Jong Hun Han","doi":"10.1007/s42823-025-00859-w","DOIUrl":"10.1007/s42823-025-00859-w","url":null,"abstract":"<div><p>Carbon nanotube (CNT) fibers were synthesized in this study under a hydrogen atmosphere using the floating-catalyst chemical vapor deposition (CVD) technique. Acetone, ferrocene, and thiophene served as the sources of carbon, catalyst, and promoter, respectively. By adjusting the amount of thiophene, the sulfur molar ratio in the CVD reactor was varied to study its impact on the morphology and composition of the CNT fibers. Raman and TEM analyses showed that the structural properties of the CNTs, especially the production of single-walled CNTs (SWCNTs) with a high Raman I<sub>G</sub>/I<sub>D</sub> ratio of approximately 23.8, can be finely tuned by altering the sulfur content, which also affects the accumulation of spherical carbonaceous particles. Moreover, it was established that the electrical conductivity of the CNT fibers is significantly influenced by their specific components—SWCNTs, multi-walled CNTs (MWCNTs), and spherical carbonaceous particles. The ratios of these components can be adjusted by modifying the molar ratios of catalyst and promoter in the precursor mixture. Remarkably, SWCNTs with enhanced crystallinity were found to substantially improve the electrical conductivity of the CNT fibers, despite the presence of numerous spherical carbon impurities.</p></div>","PeriodicalId":506,"journal":{"name":"Carbon Letters","volume":"35 3","pages":"1271 - 1283"},"PeriodicalIF":5.5,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144084941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Coal tar-coated artificial graphite anode derived from polyethylene for lithium-ion batteries 锂离子电池用聚乙烯制备的煤焦油包覆人造石墨阳极

IF 5.5 3区材料科学

Carbon Letters Pub Date : 2025-01-28 DOI: 10.1007/s42823-024-00855-6

Heewon Jin, Chelwoo Kim, Sei-Min Park, Jung-Chul An, Inchan Yang, Dalsu Choi

{"title":"Coal tar-coated artificial graphite anode derived from polyethylene for lithium-ion batteries","authors":"Heewon Jin, Chelwoo Kim, Sei-Min Park, Jung-Chul An, Inchan Yang, Dalsu Choi","doi":"10.1007/s42823-024-00855-6","DOIUrl":"10.1007/s42823-024-00855-6","url":null,"abstract":"<p>Polyethylene (PE) is one of the most widely used plastics, and vast amounts of waste PE are either buried or incinerated, leading to environmental concerns. Significant research efforts have focused on converting waste PE into carbon materials, particularly as carbon anodes for lithium-ion batteries (LIBs). However, most previously developed PE-based carbon anodes have underperformed compared to graphite-based commercial anode materials (CAM). In this study, LIB anode materials were prepared based on both commercial high-density polyethylene (CPE) and waste high-density polyethylene (WPE). Through thermal oxidative stabilization and high-temperature graphitization, both CPE and WPE were successfully transformed into highly crystalline carbon materials comparable to CAM. However, despite the high crystallinity, both CPE and WPE derived carbon contained significant number of fine particles and exhibited a broad particle size distribution. When used as an anode for LIBs, fine particles led to unwanted side reactions, resulting in an initial coulombic efficiency (ICE) of around 85%, which is lower than the ICE value of 92.5% observed in CAM. To tackle the low ICE problem, recarbonization after coal tar (CT) coating was adopted as a mean to induce secondary particle formation. After CT coating, the average particle size increased, and the size distribution became narrower. Although CT coating reduced the crystallinity slightly, the overall level remained comparable to that of CAM. As a result, the CT-coated graphitized CPE (GCPE@10CT) and CT-coated graphitized WPE (GWPE@10CT) exhibited performance comparable to CAM as LIB anodes, achieving an ICE of over 93% and a capacity of approximately 349 mAh g<sup>−1</sup>.</p>","PeriodicalId":506,"journal":{"name":"Carbon Letters","volume":"35 3","pages":"1259 - 1270"},"PeriodicalIF":5.5,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144084938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Polyacrylonitrile-derived carbon nanofibers/carbon foams containing closed microspheres 含封闭微球的聚丙烯腈衍生碳纳米纤维/碳泡沫

IF 5.5 3区材料科学

Carbon Letters Pub Date : 2025-01-27 DOI: 10.1007/s42823-025-00862-1

Yue Cao, Bin Wang, Gongfei Xue, Linwei Hou, Heng Wang, Bingyao Su

{"title":"Polyacrylonitrile-derived carbon nanofibers/carbon foams containing closed microspheres","authors":"Yue Cao, Bin Wang, Gongfei Xue, Linwei Hou, Heng Wang, Bingyao Su","doi":"10.1007/s42823-025-00862-1","DOIUrl":"10.1007/s42823-025-00862-1","url":null,"abstract":"<div><p>Lightweight materials with favorable mechanical, electromagnetic interference (EMI) shielding and thermal insulation performance are highly desirable for applications in harsh environments. Polyacrylonitrile (PAN)-derived carbon nanofibers/carbon foams containing hollow closed microspheres have been developed, and their balanced multifunction is noteworthy. The addition of CNFs resulted in a gradual enhancement of the specific compressive strength of carbon foams, reaching a maximum value of 26.6 MPa·cm<sup>3</sup>·g<sup>−1</sup> with content of 3 wt.% CNFs, improved by as much as 62%, compared to that of pristine carbon foam. Additionally, the fracture toughness exhibited the maximum fracture energy absorption of 118.6 MJ‧m<sup>−3</sup> at 3 wt.% CNFs. The appropriate amount of CNFs and hollow carbon microspheres resulted in effective toughening and strengthening of carbon foams. Incorporation of CNFs into carbon foams also resulted in an improvement in their electromagnetic shielding performance, with a maximum EMI-shielding effectiveness of 65.8 dB. Reflection loss was the main contributor to electromagnetic shielding efficiency. Furthermore, carbon foams presented remarkable high-temperature thermal insulation, with a minimum thermal conductivity of merely 0.509 W·m<sup>−1</sup>·K<sup>−1</sup> at 800 °C. They exhibited the ability to withstand the butane flame ablation at 1000 °C, which substantiated the potential of carbon foams for aerospace applications.</p></div>","PeriodicalId":506,"journal":{"name":"Carbon Letters","volume":"35 3","pages":"1235 - 1246"},"PeriodicalIF":5.5,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144084999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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