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The defense date of the thesis is 2018-08-30
The current date is 2019-05-22
This thesis will be accessible at 2020-08-30
URN etd-0829118-143044 Statistics This thesis had been viewed 110 times. Download 0 times. Author Yu-Kai Hsu Author's Email Address email@example.com Department Chemical Engineering Year 2017 Semester 2 Degree Master Type of Document Master's Thesis Language English Page Count 99 Title Electrodeposition of Nickel Sulfide Thin Film : Study of Mechanism and Application of Hybrid supercapacitors Keyword Nickel sulfide electrodeposition supercapacitors supercapacitors electrodeposition Nickel sulfide Abstract In this study, the nickel sulfide electrodeposition mechanism has been successfully derived by cyclic voltammetry (CV) and X-ray photoelectron spectroscopy (XPS). Its reaction formula is: 3[NiTU]2+ + 6e− → Ni3S2 + 2CN- + 2NH4+ + TU. Besides, the role of thiourea (TU) in the electrodeposition process is also studied via microfluidic device, electrochemical quartz crystal microbalance (EQCM) and some electrochemical measurements. It shows that the reduction current and deposition rate increased significantly with the increase of TU concentration. Therefore, it is proved that TU can not only provide the source of sulfur, but also act as an accelerator in the electrodeposition process.
In addition, this study further employed pulse-reversal (PR) electrodeposition methods to adjust the different oxidation potentials that successfully prepared various of nanostructure of nickel sulfide electrodes (Ni3S2, NiS and NiS/Ni3S2) in carbon fiber cloth (CFC). The resultant NiS/Ni3S2 electrode has a good specific capacity of 170.9 mAh g-1 at a current density of 2 A g-1 and a capacity retention rate of 65% at a current density of 10 A g-1. Furthermore, the NiS/Ni3S2 as a positive electrode and acidified activated carbon (AAC) as a negative electrode to fabricate a hybrid supercapacitor. It exhibits the high specific capacity of 40.9 mAh g-1 at 2 A g-1 and has an energy density of 38.1 Wh kg-1 and a power density of 1861 W kg-1.
Advisor Committee Jeng-Yu Lin - advisor
Han-Yi Chen - co-chair
Lu-Yin Lin - co-chair
Tsung-Wu Lin - co-chair
Files Date of Defense 2018-07-13 Date of Submission 2018-08-30