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RISS 인기검색어
- 검색키워드
- 저자 : Koratkar, Nikhil (검색결과 3 건)
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Far-infrared reduced graphene oxide as high performance electrodes for supercapacitors
Xiang, F.,Zhong, J.,Gu, N.,Mukherjee, R.,Oh, I.K.,Koratkar, N.,Yang, Z. Pergamon Press ; Elsevier Science Ltd 2014 Carbon Vol.75 No.-
We report a novel far-infrared (FIR) thermal reduction process to effectively reduce graphene oxide films for supercapacitor electrode applications. The binder-free graphene oxide films used in this study were produced by electro-spray deposition of a graphene oxide colloidal solution onto stainless steel current collectors. The reduction of graphene oxide was performed using a commercial FIR convection oven that is ubiquitous in homes for cooking and heating food. The reduction process incorporated a simple, one-step FIR irradiation carried out in ambient air. Further, the FIR irradiation process was completed in ~3min, wherein neither special atmosphere nor high temperature was employed, resulting in an economic, efficient and simplified processing technique. The as-produced FIR graphene electrode gave a specific capacitance of ~320F/g at a current density of ~0.2A/g with less than 94% loss in specific capacitance over 10,000 charge/discharge cycles. This is one of the best specific capacitances reported for all-carbon electrodes without any additives. Even at ultrafast charge/discharge rates (current densities as high as ~100A/g), the FIR graphene electrode still delivered specific capacitances in excess of 90F/g. The measured energy and power densities of the FIR supercapacitors were found to be ~3-6 times higher than commercial (activated carbon) supercapacitor devices. This excellent electrochemical performance of the FIR graphene coupled with its ease of production (in air at low temperatures) using a commercial home-use FIR convection oven indicates the significant potential of this concept for large-scale commercial electrochemical supercapacitor applications.
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Graphene–Nanotube–Iron Hierarchical Nanostructure as Lithium Ion Battery Anode
Lee, Si-Hwa,Sridhar, Vadahanambi,Jung, Jung-Hwan,Karthikeyan, Kaliyappan,Lee, Yun-Sung,Mukherjee, Rahul,Koratkar, Nikhil,Oh, Il-Kwon American Chemical Society 2013 ACS NANO Vol.7 No.5
<P>In this study, we report a novel route <I>via</I> microwave irradiation to synthesize a bio-inspired hierarchical graphene–nanotube–iron three-dimensional nanostructure as an anode material in lithium-ion batteries. The nanostructure comprises vertically aligned carbon nanotubes grown directly on graphene sheets along with shorter branches of carbon nanotubes stemming out from both the graphene sheets and the vertically aligned carbon nanotubes. This bio-inspired hierarchical structure provides a three-dimensional conductive network for efficient charge-transfer and prevents the agglomeration and restacking of the graphene sheets enabling Li-ions to have greater access to the electrode material. In addition, functional iron-oxide nanoparticles decorated within the three-dimensional hierarchical structure provides outstanding lithium storage characteristics, resulting in very high specific capacities. The anode material delivers a reversible capacity of ∼1024 mA·h·g<SUP>–1</SUP> even after prolonged cycling along with a Coulombic efficiency in excess of 99%, which reflects the ability of the hierarchical network to prevent agglomeration of the iron-oxide nanoparticles.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2013/ancac3.2013.7.issue-5/nn4007253/production/images/medium/nn-2013-007253_0007.gif'></P>
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