Title page for etd-0611113-173602


[Back to Results | New Search]

URN etd-0611113-173602
Author Li Cheng
Author's Email Address No Public.
Statistics This thesis had been viewed 5336 times. Download 876 times.
Department Materials and Optoelectronic Science
Year 2012
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Manganese Oxide-Doped Carbon Nanofiber as Electrode Materials for Electric Double Layer Capacitors
Date of Defense 2013-07-02
Page Count 79
Keyword
  • Supercapacitors
  • Electrospinning
  • Carbon nanofiber
  • Abstract MnO2/CNF nanofiber composite material used for batteries and capacitors is produced by stabilization, dipping and carbonization on electrospun polyacrylonitrile(PAN) nanofiber paper in this experiment. This research uses dip-coating to dope manganese oxide into carbon nanofiber in order to enhance electro capacity. Scanning electron microscope (SEM), Transmission electron microscope (TEM), thermal gravimetric analysis (TGA), Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD) and cyclic voltammetry (CV) are utilized to analyze and research in this experiment.
      Under SEM, electrospun PAN nanofiber bended, melted, aggregated and swelled after dipping in manganese sulfate solution, which revels the breakdown of fiber structure. CNF after being dopped for 1 hour contains only 0.65 % of Mn element from EDS analysis. Small number of MnO2 particle can be seen in dipped CNF via TEM. Dipped CNF has higher retention (67 %) yield than undipped CNF (34 %), revealed by TGA result. XRD shows peak shifts without new peak appeared, attributed to breakdown of d-spacing in the structure by acid. CV curves show narrow shape and the undipped CNF has highest specific capacity and the specific capacity lowers severely from 7.04 F/g to 1.18 F/g after 5 minutes dipping process. With dipping by 60 minutes, specific capacity of CNF raises slightly to 2.23 F/g. CNF that dipped after carbonization has capacity of 14.67 F/g.
    Advisory Committee
  • Bing-Hwait Hwang - chair
  • Kuo-Kuang Cheng - co-chair
  • Tzu-Chien Hsu - advisor
  • Files
  • etd-0611113-173602.pdf
  • Indicate in-campus at 1 year and off-campus access at 3 year.
    Date of Submission 2013-07-18

    [Back to Results | New Search]


    Browse | Search All Available ETDs

    If you have more questions or technical problems, please contact eThesys