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Self-assembled activated carbon sandwiched graphene film for symmetrical supercapacitors

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Journal of Central South University 2020年第12期27卷 3603-3614页

作者： WU Yuan-yuan ZHU Lian-wen CHEN Ru-ting GU Li CAO Xue-bo LU Shao-rong College of Materials Science and Engineering Guilin University of TechnologyGuilin 541004China School of Materials and Textile Engineering Jiaxing UniversityJiaxing 314001China College of Biological Chemical Sciences and EngineeringJiaxing UniversityJiaxing 314001China Department of Materials Imperial College LondonLondonSW72AZUnited Kingdom

Activated carbon(AC)particles sandwiched reduced graphene oxide sheets(rGO)film has been successfully fabricated via a facile self-assemble *** as-formed AC/rGO film is self-standing,flexible and mechanically robust,allowing to be transferred to any substrate on demand without *** AC particles effectively suppressed the restacking of the rGO sheet,AC/rGO film exhibits loose layer-by-layer stacking structures with various gaps between AC particles and rGO sheets,which is different from compact structures of pure graphene *** as-formed gaps provide fast diffusion channels for electrolyte ions and enhanced accessible surface area of ***,the AC/rGO electrode delivers improved electrochemical performance over the voltage range of 0.0−3.0 *** work offers a promising strategy to design free-standing supercapacitor electrodes based on traditional nanocarbon materials.

关键词： graphene film activated carbon self-assembly supercapacitor

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Fast scanning growth of high-quality graphene films on Cu foils fueled by dimeric carbon precursor

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Nano Research 2023年第10期16卷 12246-12252页

作者： Heng Chen Xiucai Sun Xiaofeng Song Buhang Chen Ziteng Ma Wanjian Yin Luzhao Sun Zhongfan Liu Center for Nanochemistry Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular SciencesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Beijing graphene Institute Beijing 100095China College of Materials Science and Technology Beijing University of Chemical TechnologyBeijing 100029China College of Energy Soochow Institute for Energy and Materials InnovationS(SIEMIS)Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu ProvinceSUDA-BGI Collaborative Innovation CenterSoochow UniversitySuzhou 215006China

Carbon source precursor is a critical factor governing chemical vapor deposition growth of graphene ***(CH4),has been the most commonly used precursor in the last decade,but it presents challenges in terms of decomposition efficiency and growth *** we thoroughly evaluated acetylene(C2H_(2)),a precursor that is probably for providing carbon dimer(C2)species,for fast growth of large-scale graphene *** find that the graphene growth behaviors fueled by C2H_(2) exhibit unconventional localized growth behavior with significant advantages in terms of high growth rate,which mainly ascribe to the as-decomposed C2 ***,a C2-fueled scanning growth strategy is proposed,and the fast scanning growth rate of 40 cm/min was experimentally *** growth strategy is compatible with the approach of unidirectional growth of single-crystal graphene films,and the as-grown graphene films are of *** work demonstrates a reliable and promising strategy for the rapid synthesis of high-quality graphene film and may pave the avenue to cost-effective mass production of graphene materials in the roll-to-roll system.

关键词： graphene film chemical vapor deposition fast growth carbon dimer roll-to-roll production

Defects boost graphitization for highly conductive graphene films

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National Science Review 2023年第7期10卷 172-182页

作者： Qing Zhang Qinwei Wei Kun Huang Zhibo Liu Wei Ma Zehui Zhang Yanfeng Zhang Hui-Ming Cheng Wencai Ren Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences School of Materials Science and Engineering University of Science and Technology of China School of Materials Science and Engineering Peking University Shenzhen Institute of Advanced Technology Chinese Academy of Sciences

Fabricating highly crystalline macroscopic films with extraordinary electrical and thermal conductivities from graphene sheets is essential for applications in electronics,telecommunications and thermal ***-temperature graphitization is the only method known to date for the crystallization of all types of carbon materials,where defects are gradually removed with increasing ***,when using graphene materials as precursors,including graphene oxide,reduced graphene oxide and pristine graphene,even lengthy graphitization at 3000℃ can only produce graphene films with small grain sizes and abundant structural disorders,which limit their ***,we show that high-temperature defects substantially accelerate the grain growth and ordering of graphene films during graphitization,enabling ideal AB stacking as well as a 100-fold,64-fold and 28-fold improvement in grain size,electrical conductivity and thermal conductivity,respectively,between 2000℃ and 3000℃.This process is realized by nitrogen doping,which retards the lattice restoration of defective graphene,retaining abundant defects such as vacancies,dislocations and grain boundaries in graphene films at a high *** this approach,a highly ordered crystalline graphene film similar to highly oriented pyrolytic graphite is fabricated,with electrical and thermal conductivities(～2.0×104S cm-1;～1.7×103W m-1K-1) that are improved by about 6-and 2-fold,respectively,compared to those of the graphene films fabricated by graphene *** graphene film also exhibits a superhigh electromagnetic interference shielding effectiveness of ～90 dB at a thickness of 10 μm,outperforming all the synthetic materials of comparable thickness including MXene *** work not only paves the way for the te chnological application of highly conductive graphene films but also provides a general strategy to efficiently improve the synthesis and properties of other carbon materials such as graphene f

关键词： graphene film defects graphitization electrical and thermal conductivity thermal management and EMI shielding

Scalable fabrication of graphene-assembled multifunctional electrode with efficient electrochemical detection of dopamine and glucose

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Nano Research 2023年第5期16卷 6361-6368页

作者： Xiaodong Ji Xin Zhao Zixin Zhang Yunfa Si Wei Qian Huaqiang Fu Zibo Chen Zhe Wang Huihui Jin Zhugen Yang Daping He State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China Hubei Engineering Research Center of RF-Microwave Technology and Application Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Information Engineering Wuhan University of TechnologyWuhan 430070China School of Water Energy and EnvironmentCranfield UniversityMilton KeynesMK430ALUK

Conventional glassy carbon electrodes(GCE)cannot meet the requirements of future electrodes for wider use due to low conductivity,high cost,non-portability,lack of ***,cost-effective and wearable electrode enabling rapid and versatile molecule detection is becoming important,especially with the ever-increasing demand for health monitoring and point-ofcare *** is considered as an ideal electrode due to its excellent physicochemical ***,we prepare graphene film with ultra-high conductivity and customize the 3-electrode system via a facile and highly controllable laser engraving *** from the ultra-high conductivity(5.65×10^(5)S·m^(−1)),the 3-electrode system can be used as multifunctional electrode for direct detection of dopamine(DA)and enzyme-based detection of glucose without further metal *** dynamic ranges from 1–200μM to 0.5–8.0 mM were observed for DA and glucose,respectively,with a limit of detection(LOD)of 0.6μM and 0.41 ***,the excellent target detection capability caused by the ultra-high conductivity and ease modification of graphene films,together with their superb mechanical properties and ease of mass-produced,provides clear potential not only for replacing GCE for various electrochemical studies but also for the development of portable and highperformance electrochemical wearable medical devices.

关键词： graphene film ultra-high conductivity multifunctional electrode point-of-care diagnosis wearable medical devices

A 3D graphene/polyimide fiber framework with improved thermal conductivity and mechanical performance

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Journal of Central South University 2022年第6期29卷 1761-1777页

作者： WANG Xian-peng HU Ai-ping CHEN Xiao-hua LIU Ji-lei LI Yan-hua LI Chuan-yi WANG Han TANG Qun-li College of Materials Science and Engineering Hunan UniversityChangsha 410082China College of Materials and Chemistry Engineering Hunan Institute of TechnologyHengyang 421002China

The integration of electronic components and the popularity of flexible devices have come up with higher expectations for the heat dissipation capability and comprehensive mechanical performance of thermal management *** this work,after the modification of polyimide(PI)fibers through oxidation and amination,the obtained PDA@OPI fibers(polydopamine(PDA)-modified pre-oxidized PI fibers)with abundant amino groups were mixed into graphene oxide(GO)to form uniform GO-PDA@OPI *** by evaporation,carbonization,graphitization and mechanical compaction,the G-gPDA@OPI films with a stable three-dimensional(3D)long-range interconnected covalent structure were *** particular,due to the rich covalent bonds between GO layers and PDI@OPI fibers,the enhanced synergistic graphitization promotes an ordered graphitized structure with less interlayer distance between adjacent graphene sheets in composite *** a result,the optimized G-gPDA@OPI film displays an improved tensile strength of 78.5 MPa,tensile strain of 19.4%and thermal conductivity of 1028 W/(m·K).Simultaneously,it also shows superior flexibility and high *** work provides an easily-controlled and relatively low-cost route for fabricating multifunctional graphene heat dissipation films.

关键词： graphene film modified polyimide fiber polydopamine thermal conductivity mechanical properties

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