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Title page for etd-0913116-125709


URN etd-0913116-125709 Statistics This thesis had been viewed 490 times. Download 0 times.
Author Zheng-chang Huang
Author's Email Address No Public.
Department Chemical Engineering
Year 2015 Semester 2
Degree Master Type of Document Master's Thesis
Language zh-TW.Big5 Chinese Page Count 66
Title Study of cobalt sulfide thin film prepared by electrodeposition and its application in supercapacitors
Keyword
  • cobalt sulfide
  • supercapacitor
  • supercapacitor
  • cobalt sulfide
  • Abstract In this study, the reduction mechanism of cobalt sulfide has been investigated by using cyclic voltammetry (CV) and X-ray photoelectron spectroscopy (XPS). The reduction equation is [CoTU]2+ + 2e- →CoS + 2CN- + 2NH4+ + TU .According to the results of role of thiourea(TU) by using a microfluidic device, we can find the current be lower when the concentration change to 1M. We can observe the equilibrium voltage become large when the concentration of TU raised by using Tafel analysis and it exhibit the large impedance when the concentration of TU go up by using Electrochemical impedance spectroscopy(EIS).according to the results,the role of TU in the electrolyte might serve as an inhibitor. We also successfully prepare Co9S8 on Nickel foam substrate by using pulse-reversal deposition. It is high capacitance and good rate capability at 750mM TU and 1M TU. The electroactive materials delivered remarkable specific capacity up to 159 mAhg-1 and 193mhAg-1 at 2Ag-1. The retained ratio of capacitance of both is 71% and 60% with 2Ag-1 to 32Ag-1. Finally in this study, we try to change the structure of Co9S8 by using additive (Cetyltrimethylammonium bromide,CTAB or Polyethylene glycol hexadecyl ether,brij58) to the electrolyte. According to the results, the additive CTAB has no effects. But brij58 made the flaky structure of Co9S8 be small. Therefore, we will still use the brij58 in our study.
    Advisor Committee
  • Jeng-yu Lin - advisor
  • Ran-bin Lin - co-chair
  • Yuh-jing Chiou - co-chair
  • Files indicate in-campus access at 2 years and off-campus not accessible
    Date of Defense 2016-07-28 Date of Submission 2016-09-19


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