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RISS 인기검색어
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- 저자 : Compagnini, G. (검색결과 1 건)
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Li, R.-Z.,Peng, Rui,Kihm, K. D.,Bai, S.,Bridges, D.,Tumuluri, U.,Wu, Z.,Zhang, T.,Compagnini, G.,Feng, Z.,Hu, A. The Royal Society of Chemistry 2016 ENERGY AND ENVIRONMENTAL SCIENCE Vol.9 No.4
<P>Direct laser-reduction of graphene oxide (GO), as a lithography-free approach, has been proven effective in manufacturing in-plane micro-supercapacitors (MSCs) with fast ion diffusion. However, the power density and the charge/discharge rate are still limited by the relatively low conductivity of electrodes. Here, we report a facile approach by exploiting femtolaser <I>in situ</I> reduction of the hydrated GO and chloroauric acid (HAuCl<SUB>4</SUB>) nanocomposite simultaneously, which incorporates both the patterning of rGO electrodes and the fabrication of Au current collectors in a single step. These flexible MSCs boast achievements of one-hundred fold increase in electrode conductivities of up to 1.1 × 10<SUP>6</SUP> S m<SUP>−1</SUP>, which provide superior rate capability (50% for the charging rate increase from 0.1 V s<SUP>−1</SUP> to 100 V s<SUP>−1</SUP>), sufficiently high frequency responses (362 Hz, 2.76 ms time constant), and large specific capacitances of 0.77 mF cm<SUP>−2</SUP> (17.2 F cm<SUP>−3</SUP> for volumetric capacitance) at 1 V s<SUP>−1</SUP>, and 0.46 mF cm<SUP>−2</SUP> (10.2 F cm<SUP>−3</SUP>) at 100 V s<SUP>−1</SUP>. The use of photo paper substrates enables the flexibility of this fabrication protocol. Moreover, proof-of-concept 3D MSCs are demonstrated with enhanced areal capacitance (up to 3.84 mF cm<SUP>−2</SUP> at 1 V s<SUP>−1</SUP>) while keeping high rate capabilities. This prototype of all solid-state MSCs demonstrates the broad range of potentials of thin-film based energy storage device applications for flexible, portable, and wearable electronic devices that require a fast charge/discharge rate and high power density.</P> <P>Graphic Abstract</P><P>Direct laser-reduction of graphene oxide (GO), as a lithography-free approach, has been proven effective in manufacturing in-plane micro-supercapacitors (MSCs) with fast ion diffusion. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c5ee03637b'> </P>
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