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Xu, Ping,Kang, Junmo,Choi, Jae-Boong,Suhr, Jonghwan,Yu, Jianyong,Li, Faxue,Byun, Joon-Hyung,Kim, Byung-Sun,Chou, Tsu-Wei American Chemical Society 2014 ACS NANO Vol.8 No.9
<P>Due to their exceptional flexibility and transparency, CVD graphene films have been regarded as an ideal replacement of indium tin oxide for transparent electrodes, especially in applications where electronic devices may be subjected to large tensile strain. However, the search for a desirable combination of stretchability and electrochemical performance of such devices remains a huge challenge. Here, we demonstrate the implementation of a laminated ultrathin CVD graphene film as a stretchable and transparent electrode for supercapacitors. Transferred and buckled on PDMS substrates by a prestraininig-then-buckling strategy, the four-layer graphene film maintained its outstanding quality, as evidenced by Raman spectra. Optical transmittance of up to 72.9% at a wavelength of 550 nm and stretchability of 40% were achieved. As the tensile strain increased up to 40%, the specific capacitance showed no degradation and even increased slightly. Furthermore, the supercapacitor demonstrated excellent frequency capability with small time constants under stretching.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2014/ancac3.2014.8.issue-9/nn503570j/production/images/medium/nn-2014-03570j_0008.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>
Reduction of [Fe(III)EDTA]ˉcatalyzed by activated carbon modified with KOH solution
Lin Yang,Xiang-li Long,Xue-wei Chou,Cong Li,Wei-kang Yuan 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.3
NO and SO2 can be eliminated simultaneously by [Fe(II)EDTA]2ˉ solution with a pH range of 5.6–8.0 at 25–80 8C. Activated carbon is used to catalyze the regeneration of [Fe(II)EDTA]2ˉ. In this paper, KOH solution has been utilized to modify the carbon to improve its catalytic capability. Experimental results show that the optimal modification factors are as follow: KOH concentration 6.0 mol l-1, impregnation time 9 h, activation temperature 700 8C and activation time 4 h. After KOH modification, the surface area of activated carbon decreases. But its basicity is enhanced, which plays an important role in improving the catalytic characteristics of activated carbon in the reduction of [Fe(III)EDTA]ˉ. The experimental results demonstrate that the activated carbon modified by concentrated KOH solution can get a higher NO removal efficiency than the original activated carbon.