tailieunhanh - Báo cáo hóa học: " Composite Electrodes for Electrochemical "

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Composite Electrodes for Electrochemical | Nanoscale Res Lett 2010 5 512-517 DOI s11671-009-9518-0 SPECIAL ISSUE ARTICLE Composite Electrodes for Electrochemical Supercapacitors Jun Li Quan Min Yang Igor Zhitomirsky Received 30 July 2009 Accepted 17 December 2009 Published online 7 January 2010 The Author s 2010. This article is published with open access at Abstract Manganese dioxide nanofibers with length ranged from to 1 m and a diameter of about 4-6 nm were prepared by a chemical precipitation method. Composite electrodes for electrochemical supercapacitors were fabricated by impregnation of the manganese dioxide nanofibers and multiwalled carbon nanotubes MWCNT into porous Ni plaque current collectors. Obtained composite electrodes containing 85 of manganese dioxide and 15 mass of MWCNT as a conductive additive with total mass loading of 7-15 mg cm- showed a capacitive behavior in Na2SO4 solutions. The decrease in stirring time during precipitation of the nanofibers resulted in reduced agglomeration and higher specific capacitance SC . The highest SC of 185 F g-1 was obtained at a scan rate of 2 mV s-1 for mass loading of 7 mg cm-2. The SC decreased with increasing scan rate and increasing electrode mass. Keywords Manganese dioxide Carbon nanotube Nickel plaque Supercapacitor Impregnation Composite Introduction Porous Ni materials such as plaques 1 and foams 2 are widely used in industry for the fabrication of electrodes for rechargeable batteries. Nanostructured active materials are J. Li I. Zhitomirsky El Department of Materials Science and Engineering McMaster University 1280 Main Street West Hamilton ON L8S 4l7 Canada e-mail zhitom@ Q. M. Yang Vale Inco Limited Mississauga ON L5K 1Z9 Canada impregnated chemically or electrochemically into the porous Ni structures which are used as current collectors 3 . Ni plaques are current collectors of choice for battery applications demanding high power and reliability along with long cycle life such as batteries .

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