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Xu, Ping,Wei, Bingqing,Cao, Zeyuan,Zheng, Jie,Gong, Ke,Li, Faxue,Yu, Jianyong,Li, Qingwen,Lu, Weibang,Byun, Joon-Hyung,Kim, Byung-Sun,Yan, Yushan,Chou, Tsu-Wei American Chemical Society 2015 ACS NANO Vol.9 No.6
<P>While the emerging wire-shaped supercapacitors (WSS) have been demonstrated as promising energy storage devices to be implemented in smart textiles, challenges in achieving the combination of both high mechanical stretchability and excellent electrochemical performance still exist. Here, an asymmetric configuration is applied to the WSS, extending the potential window from 0.8 to 1.5 V, achieving tripled energy density and doubled power density compared to its asymmetric counterpart while accomplishing stretchability of up to 100% through the prestrainning-then-buckling approach. The stretchable asymmetric WSS constituted of MnO<SUB>2</SUB>/CNT hybrid fiber positive electrode, aerogel CNT fiber negative electrode and KOH-PVA electrolyte possesses a high specific capacitance of around 157.53 μF cm<SUP>–1</SUP> at 50 mV s<SUP>–1</SUP> and a high energy density varying from 17.26 to 46.59 nWh cm<SUP>–1</SUP> with the corresponding power density changing from 7.63 to 61.55 μW cm<SUP>–1</SUP>. Remarkably, a cyclic tensile strain of up to 100% exerts negligible effects on the electrochemical performance of the stretchable asymmetric WSS. Moreover, after 10 000 galvanostatic charge–discharge cycles, the specific capacitance retains over 99%, demonstrating a long cyclic stability.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2015/ancac3.2015.9.issue-6/acsnano.5b01244/production/images/medium/nn-2015-012442_0007.gif'></P>
Spatial strain variation of graphene films for stretchable electrodes
Xu, Ping,Kang, Junmo,Suhr, Jonghwan,Smith, Joseph P.,Booksh, Karl S.,Wei, Bingqing,Yu, Jianyong,Li, Faxue,Byun, Joon-Hyung,Oh, Youngseok,Chou, Tsu-Wei Elsevier 2015 Carbon Vol.93 No.-
<P><B>Abstract</B></P> <P>Graphene films fabricated by chemical vapor deposition are promising electrode materials for stretchable energy storage devices. The buckled four-layer graphene on a polydimethylsiloxane film substrate subject to various applied tensile strains has been characterized by atomic force microscopy and micro-Raman mapping. The small redshift of 2D band and the indiscernible D band demonstrated that the tensile strains of up to 40% only induced a strain variation of less than 0.2% and did not cause any observable damage in the graphene film. This study has confirmed that the graphene film in the buckled state is suitable for its application as a stretchable electrode.</P>
Structure and Electrical Resistivity of the Al - Carbon Nanotube Composites
Xu, Cailu,Wei, Bingqing,Liang, Ji,Wu, Dehai 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.4
In thin paper the microstructure and the electrical resistivity of the hot-pressed Al-carbon nanotube composites have been measured. The results show that there is AlC or A1C₂ phases in the structure, the electrical resistivity of the samples with carbon nanotubes at room temperature is slightly higher than that of the samples without carbon nanotubes. There is an abrupt drop of the electrical resistivity of the Al-carbon nanotube composites at about 80 K, which is similar to the superconducting transition.
Experimental and analytical study on continuous GFRP concrete decks with steel bars
Zhaojie Tong,Yiyan Chen,Qiao Huang,Xiaodong Song,Bingqing Luo,Xiang Xu 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.76 No.6
A hybrid bridge deck is proposed, which includes steel bars, concrete and glass-fiber-reinforced-polymer (GFRP) plates with channel sections. The steel bar in the negative moment region can increase the flexural stiffness, improve the ductility, and reduce the GFRP ratio. Three continuous decks with different steel bar ratios and a simply supported deck were fabricated and tested to study the mechanical performance. The failure mode, deflection, strain distribution, cracks and support reaction were tested and discussed. The steel bar improves the mechanical performance of continuous decks, and a theoretical method is proposed to predict the deformation and the shear capacity. The experimental results show that all specimens failed with shear failure in the positive moment region. The increase of steel bar ratio in the negative moment region can achieve an enhancement in the flexural stiffness and reduce the deflection without increasing GFRP. Moreover, the continuous deck can achieve a yield load, and the negative moment can be carried by GFRP plates after the steel bar yields. Finally, a nonlinear analytical method for the deflection calculation was proposed and verified, with considering the moment redistribution, non-cracked sections and nonlinearity of material. In addition, a simplified calculation method was proposed to predict the shear capacity of GFRP-concrete decks.