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vertical graphene-coated Cu wire for enhanced tolerance to high current density in power transmission

Nano Research 2022年第11期15卷 9727-9733页

作者： Kun Wang Shuting Cheng Qingmei Hu Feng Yu Yi Cheng Kewen Huang Hao Yuan Jun Jiang Wenjuan Li Junliang Li Shichen Xu Jianbo Yin Yue Qi Zhongfan Liu Center for Nanochemistry(CNC) Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular SciencesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Beijing graphene Institute(BGI) Beijing 100095China State Key Laboratory of Heavy Oil Processing College of ScienceChina University of PetroleumBeijing 102249China

Cu wires(CuWs)are widely used as electric transmission ***,their limited thermal and chemical stabilities become challenges under the high-power and harsh *** is regarded as an ideal protective barrier for CuW benefiting from its impermeability to all atoms and ***,the excellent hydrophobicity of vertical graphene(VG)will strengthen its protective capability as a corrosion and oxidation ***,VG is directly synthesized on CuW by plasmaenhanced chemical vapor deposition *** hydrophobic VG coating with a high water contact angle can effectively exclude the corrosive liquid and moisture from CuW surface and prevent their further ***,the electrochemical corrosion rate of VG-CuW is reduced by~13,8,and 2 times,compared with bare CuW,VG-CuW with hydrophilic treatment,and CuW coated with thick horizontal graphene layers,*** oxidation occurs on VGCuW after the long-time exposure to humid air at~200℃ along with the largely enhanced tolerance under high-current operating *** study reveals the impressive potentials of hydrophobic VG as a robust corrosion and oxidation barrier for metal wires used in high-power cables and electronic devices in harsh environment.

关键词： vertical graphene Cu wire oxidation and corrosion plasma-enhanced chemical vapor deposition

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Complex permittivity-dependent plasma confinement-assisted growth of asymmetric vertical graphene nanofiber membrane for high-performance Li-S full cells

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InfoMat 2022年第7期4卷 129-146页

作者： Yongshang Zhang Zhiheng Wu Shaobin Wang Neng Li S.Ravi P.Silva Guosheng Shao Peng Zhang State Center for International Cooperation on Designer Low-Carbon&Environmental Materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhouChina Zhengzhou Materials Genome Institute(ZMGI) ZhengzhouChina School of Chemical Engineering and Advanced Materials University of AdelaideAdelaideSouth AustraliaAustralia State Key Laboratory of Silicate Materials for Architecture Wuhan University of TechnologyWuhanChina Nanoelectronics Center Advanced Technology InstituteUniversity of SurreyGuildfordUK

vertical graphene(VG),possessing superior chemical,physical,and structural peculiarities,holds great promise as a building block for constructing a high-energy density lithium-sulfur(Li-S)***,it is desirable to develop a new VG growth technique with a novel structure to enable wide ***,we devise a novel complex permittivity-dependent plasma confinement-assisted VG growth technique,via asymmetric growing a VG layer on one side of N-doped carbon nanofibers for the first time,using a unique lab-built high flux plasma-enhanced chemical vapor deposition system,as a bifunctional nanofiber membrane to construct Li-S batteries with low neg-ative/positive(N/P)and electrolyte/sulfur(E/S)*** unique nanofiber membrane could simultaneously protect the cathode and anode,enabling an excellent electrochemical performance with low N/P and E/S ratios in Li-S *** a full cell delivers high gravimetric energy density and volumetric energy density of 340 Wh kg^(-1) and 547 Wh L^(-1),respectively,at low N/P(2:1)and E/S(4:1)***,a pouch cell achieves a high areal capacity of 7.1 mAh cm^(-2) at a sulfur loading of 6 mg cm^(-2).This work put forward a novel pathway for the design of high-energy density Li-S batteries.

关键词： asymmetric complex permittivity electrospinning Li-S batteries vertical graphene

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Boosting fast lithium ion storage of Li4Ti5O12 by synergistic effect of vertical graphene and nitrogen doping

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Journal of Energy Chemistry 2020年第12期51卷 372-377页

作者： Yan Lin Jianbo Wu Xiaohua Huang Guoxiang Pan Xinhui Xia Zhejiang Provincial Key Laboratory for Cutting Tools Taizhou University Department of Materials Chemistry Huzhou University School of Materials Science and Engineering Zhejiang University

The advancement of power-type lithium ion batteries（LIBs） mainly depends on the construction of electrodes with superior electronic & ionic conductivity. In this work, a synergistic combination of nitrogen doped LiTiO（N-LTO） nanoparticles and highly conductive vertical graphene（VG） skeleton is proposed to obtain ultrafast Li ion storage performance via a facile hydrothermal-nitridation method. The as-synthesized composite nanosheets are composed of interconnected N-LTO shell and VG core to form the final N-LTO/VG core-shell arrays, which are systematically studied as the anodes of LIBs. In virtue of the positive synergistic effect of high conductive VG backbone and nitrogen doping, overwhelming advantages including high specific surface area, superb structural stability and enhanced conductivity are achieved in the well-designed N-LTO/VG electrodes. Accordingly, the as-synthesized N-LTO/VG electrode shows outstanding high rate capacity(142.5 m Ah gat 20 C) and superior long-term cycling stability（capacity retention of 98.9% after 10000 cycles at 5 C）, better than LTO/VG electrode without N *** research provides a new strategy for the synthesis of high-performance hybrid electrodes for application in power-type LIBs.

关键词： Lithium titanate Anode Lithium ion batteries vertical graphene High power

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A flexible metallic TiC nanofiber/vertical graphene 1D/2D heterostructured as active electrocatalyst for advanced Li–S batteries

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InfoMat 2021年第7期3卷 790-803页

作者： Yongshang Zhang Peng Zhang Shijie Zhang Zheng Wang Neng Li SRavi PSilva Guosheng Shao State Center for International Cooperation on Designer Low-Carbon&Environmental Materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhouChina Zhengzhou Materials Genome Institute(ZMGI) ZhengzhouChina State Key Laboratory of Silicate Materials for Architecture Wuhan University of TechnologyWuhanChina Nanoelectronics Center Advanced Technology InstituteUniversity of SurreyGuildfordUK

The realistic application of lithium-sulfur(Li-S)batteries has been severely hindered by the sluggish conversion kinetics of polysulfides(LiPS)and inhomogeneous deposition of Li_(2)S at high sulfur loading and low electrolyte/sulfur ratio(E/S).Herein,a flexible Li-S battery architecture based on electrocatalyzed cathodes made of interfacial engineered TiC nanofibers and in situ grown vertical graphene are *** 1D/2D heterostructured electrocatalysts are realized to enable highly improved Li^(+)and electron transportation together with significantly enhanced affinity to LiPS,which effectively accelerate the conversion kinetics between sulfur species,and thus induce homogeneous deposition of Li_(2)S in the catalyzed ***,highly active electro-electrocatalystsbased cells exhibit remarkable rate capability at 2C with a high specific capacity of 971 mAh g^(-1).Even at ultra-high sulfur loading and low E/S ratio,the battery still delivers a high areal capacity of 9.1 mAh cm^(-2),with a flexible pouch cell being demonstrated to power a LED array at different bending angles with a high capacity over 100 *** work puts forward a novel pathway for the rational design of effective nanofiber electrocatalysts for cathodes of high-performance Li-S batteries.

关键词： electrocatalysis electrospinning interface engineering nanofiber vertical graphene

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Edge-Oriented graphene on Carbon Nanofiber for High-Frequency Supercapacitors

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Nano-Micro Letters 2018年第1期10卷 77-84页

作者： Nazifah Islam Juliusz Warzywoda Zhaoyang Fan Department of Electrical and Computer Engineering and Nano Tech Center Texas Tech University Materials Characterization Center Whitacre College of Engineering Texas Tech University

High-frequency supercapacitors are being studied with the aim to replace the bulky electrolytic capacitors for current ripple filtering and other functions used in power systems. Here, 3 D edge-oriented graphene(EOG)was grown encircling carbon nanofiber(CNF) framework to form a highly conductive electrode with a large surface area. Such EOG/CNF electrodes were tested in aqueous and organic electrolytes for high-frequency supercapacitor development. For the aqueous and the organic cell, the characteristic frequency at-45° phase angle was found to be as high as 22 and 8.5 k Hz, respectively. At 120 Hz, the electrode capacitance density was 0.37 and 0.16 m F cm^(-2) for the two cells. In particular, the 3 V high-frequency organic cell was successfully tested as filtering capacitor used in AC/DC converter, suggesting the promisingpotential of this technology for compact power supply design and other applications.

关键词： High-frequency supercapacitor Kilohertz supercapacitor vertical graphene Carbon nanofiber AC filtering

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