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You searched for +publisher:"NSYSU" +contributor:("Liu-Win Chang"). Showing records 1 – 2 of 2 total matches.

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NSYSU

1. Li, Yi-xuan. Two-Dimensional transition-metal dichalcogenide as Potential Anode Materials for Sodium Ion Batteries.

Degree: Master, Materials and Optoelectronic Science, 2018, NSYSU

We investigated the properties of ScTe2, TiTe2, CoTe2, FeTe2 and MnTe2 as sodium ion battery anode materials using density functional theory calculations. To search for suitable materials, we calculated the stable adsorption configurations and corresponding adsorption energies of these two-dimensional materials. The energy of low concentration adsorbate phases with single sodium ion adsorbed at different positions would be performed firstly in order to find the stable adsorption positions of the materials. The minimum energy diffusion path of sodium in the materials was predicted by climbing nudged elastic band (cNEB) method. By comparing the activation energy of sodium ion diffusion in each cathode material, the material with the smallest diffusion energy barrier was obtained. The result shows that, ScTe2 has the strongest binding energy. Although the diffusion barrier of ScTe2 is higher than others, it could be ignored because of the small difference of barriers among these materials. In addition, ab initio random structure searching method is also used to search the most stable adsorption configurations on the materials. By adsorbing different amounts of sodium on the materials, we could obtain the maximal sodium adsorption concentration in each material, and hence predict the capacity and voltage of the cathode materials. Except for CoTe2, most materials shows good stability on high concentration sodium ion adsorption. With the highest Na solubility (x=0.67) and theoretical capacity (59.93~mAh/g), therefore, ScTe2 is the most suitable for anode applications. However, the capacity of MTe2 is lower than other 2D anode materials. With great stability and OCV, 2D MTe2 are still promising as anode materials. Advisors/Committee Members: Shi-Hsin Lin (committee member), Yi-Hsuan Lai (chair), Yu-Ju Hung (chair), Liu-win Chang (chair).

Subjects/Keywords: cNEB; ion battery; transition-metal dichalcogenide; density functional theory; two-dimensional materials

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Li, Y. (2018). Two-Dimensional transition-metal dichalcogenide as Potential Anode Materials for Sodium Ion Batteries. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0731118-032045

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Li, Yi-xuan. “Two-Dimensional transition-metal dichalcogenide as Potential Anode Materials for Sodium Ion Batteries.” 2018. Thesis, NSYSU. Accessed April 22, 2019. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0731118-032045.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Li, Yi-xuan. “Two-Dimensional transition-metal dichalcogenide as Potential Anode Materials for Sodium Ion Batteries.” 2018. Web. 22 Apr 2019.

Vancouver:

Li Y. Two-Dimensional transition-metal dichalcogenide as Potential Anode Materials for Sodium Ion Batteries. [Internet] [Thesis]. NSYSU; 2018. [cited 2019 Apr 22]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0731118-032045.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Li Y. Two-Dimensional transition-metal dichalcogenide as Potential Anode Materials for Sodium Ion Batteries. [Thesis]. NSYSU; 2018. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0731118-032045

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


NSYSU

2. Lai, Yen-Huei. Effects of Sample Size on Various Metallic Glass Micropillars in Microcompression.

Degree: PhD, Materials and Optoelectronic Science, 2009, NSYSU

Over the past decades, bulk metallic glasses (BMGs) have attracted extensive interests because of their unique properties such as good corrosion resistance, large elastic limit, as well as high strength and hardness. However, with the advent of micro-electro-mechanical systems (MEMS) and other microscaled devices, the fundamental properties of micrometer-sized BMGs have become increasingly more important. Thus, in this study, a methodology for performing uniaxial compression tests on BMGs having micron-sized dimensions is presented. Micropillar with diameters of 3.8, 1 and 0.7 μm are fabricated successfully from the Mg65Cu25Gd10 and Zr63.8Ni16.2Cu15Al5 BMGs using focus ion beam, and then tested in microcompression at room temperature and strain rates from 1 x 10-4 to 1 x 10-2 s-1. Microcompression tests on the Mg- and Zr-based BMG pillar samples have shown an obvious sample size effect, with the yield strength increasing with decreasing sample diameter. The strength increase can be rationalized by the Weibull statistics for brittle materials, and the Weibull moduli of the Mg- and Zr-based BMGs are estimated to be about 35 and 60, respectively. The higher Weibull modulus of the Zr-based BMG is consistent with the more ductile nature of this system. In additions, high temperature microcompression tests are performed to investigate the deformation behavior of micron-sized Au49Ag5.5Pd2.3Cu26.9Si16.3 BMG pillar samples from room to their glass transition temperature (~400 K). For the 1 μm Au-based BMG pillars, a transition from inhomogeneous flow to homogeneous flow is clearly observed at or near the glass transition temperature. Specifically, the flow transition temperature is about 393 K atthe strain rate of 1 x 10-2 s-1. For the 3.8 μm Au-based BMG pillars, in order to investigate the homogeneous deformation behavior, microcompression tests are performed at 395.9-401.2 K. The strength is observed to decrease with increasing temperature and decreasing strain rate. Plastic flow behavior can be described by a shear transition zone model. The activation energy and the size of the basic flow unit are deduced and compared favorably with the theory. Advisors/Committee Members: Liu-Win Chang (chair), Shian-Ching Jang (chair), New-Jin Ho (chair), Chih-Ching Huang (committee member), Jinn-P. Chu (chair).

Subjects/Keywords: microcompression tests; sample size effect; metallic glass

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Lai, Y. (2009). Effects of Sample Size on Various Metallic Glass Micropillars in Microcompression. (Doctoral Dissertation). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1116109-202132

Chicago Manual of Style (16th Edition):

Lai, Yen-Huei. “Effects of Sample Size on Various Metallic Glass Micropillars in Microcompression.” 2009. Doctoral Dissertation, NSYSU. Accessed April 22, 2019. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1116109-202132.

MLA Handbook (7th Edition):

Lai, Yen-Huei. “Effects of Sample Size on Various Metallic Glass Micropillars in Microcompression.” 2009. Web. 22 Apr 2019.

Vancouver:

Lai Y. Effects of Sample Size on Various Metallic Glass Micropillars in Microcompression. [Internet] [Doctoral dissertation]. NSYSU; 2009. [cited 2019 Apr 22]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1116109-202132.

Council of Science Editors:

Lai Y. Effects of Sample Size on Various Metallic Glass Micropillars in Microcompression. [Doctoral Dissertation]. NSYSU; 2009. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1116109-202132

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