NTUST - Chemical Engineering -- Tsai,Dai-Shyang
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[T27]Tsai,Dai-Shyang

 
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Dai-Shyang Tsai

Professor


Office Location:E2-808
Phone:886-2-2737-6618
Fax:886-2-2737-6644
E-mail:dstsai@mail.ntust.edu.tw

 
 

Education:
Ph.D., University of Notre Dame, Indiana, USA, 1985.
M.S., National Taiwan University, Taipei, Taiwan, 1979.
B.S., National Taiwan University, Taipei, Taiwan, 1977.

 

 
Professional Experience and Honors
  • 1991/8 – present       Professor, Dept. Chem. Eng., National Taiwan University of Science and Technology (NTUST).
  • 1985/8 – 1991/7       Associate Professor, Dept. Chem. Eng., National Taiwan University of Science and Technology.
  • 2001/8 – 2004/7       Chairman, Dept. Chem. Eng., National Taiwan University of Science and Technology
  • 1993/7 – 1996/8, 2001/8 – 2004/7   Chairman, Research Center for Materials Science and Technology, NTUST.
  • 1988/9 – 1989/8       Visiting Scholar, Optical Fiber Preform Group, Bell Lab., Murray Hill, New Jersey, US.
  • 2007/1 – 2009/12, 2010/1 – 2010/12       Research Award, National Taiwan University of Science and Technology.
  • 2007 Engineering Paper Award, Chinese Institute of Engineers (Taiwan).
  • 2004 Best Poster Paper Award (with RS Chen, YS Huang), The 3th Cross-Strait Workshop on Nano Science and Technology.
 
 
Research Summary:
The current research interests are on preparation, characterization of functional nanomaterials and their potential device applications, including electrocatalysts for oxygen reduction and low-carbon fuel oxidation reaction, electrodes for solid oxide fuel cells, patterned electrodes for electrochemical capacitors of miniature size.
►    Chemical Vapor Deposition – synthesis tool and surface chemistry fundamental
Chemical vapor deposition (CVD) has been established as a tool for surface engineering at nanometer scale. We worked on the CVD technique over a decade, studied its fundamental aspect, such as surface reaction mechanism, diffusion, sticking probability, or employed it as a means for synthesis of 1D materials, such as RuO2, IrO2 nanophases, SnO2 nanowires, carbon nanotubes, also developed the area-selective growth technique for 1D nanomaterials. We have demonstrated, via ab initio calculation, that the intuitively favored path of Si-Si dissociative adsorption on a surface dimer was mistaken for the first step of Si2H6 CVD reaction mechanism. The energetically preferred pathway of Si2H6 or Ge2H6 CVD ought to initiate by abstracting one hydrogen atom of disilane or digermane on the buckled surface dimer. We have shown the epitaxial relations between SnO2 lattice and the substrate crystal plane determine the tilted angle, the alignment pattern, and the exposed rutile planes. The thickness of sputtered gold resolves the SnO2 wire size, which can be estimated using the broadened Raman peaks.
►    Electrocatalysts
Partial decomposition of RuO2 and IrO2 provides the catalytically restoring surface for Pt catalysis. The deoxygenated nanomaterials of Ru-RuO2 and Ir-IrO2 serve as unique conducting and CO tolerant supports for electrocatalysis. The catalysis of co-existing oxide and PGM metal has been investigated at fundamental level on the single crystal surface of RuO2 and IrO2.
Recently, we incorporated RuSe2 pyrite catalyst with nitrogen doped carbon and supported them on carbon, whose ORR activity is near that of commercial Pt/C catalyst. The annealed pyrite crystals render catalyst stability against high electric potential in an oxygen rich environment. The nitrogen doped carbon is an ORR catalyst of its own right, but plays a complimentary role in this case. The two catalytic materials of less cost exhibit intriguing methanol tolerance and a low peroxide yield.
►    Miniature electrochemical capacitors (ultracapacitors)

To fulfill the energy need of MEMS devices, we have been cooperating with KY Lee and YS Huang of EE (NTUST) on the mini electrochemical capacitor (or ultracapacitor), which is suitable for handling the peak current demand of the system. With an eye to integration with other devices, we focus on the electrochemical capacitors of planar configuration which could work as a stand-alone unit or share the battery load.
Selected Publications:
1. Shun-Ping Chiao, Dah-Shyang Tsai, David P. Wilkinson, Yi-Ming Chen, Ying-Sheng Huang “Carbon supported Ru1-xFexSey electrocatalysts of pyrite structure for oxygen reduction reaction”, International J. Hydrogen Energy, 35 (2010) 6508-6517.
2. Chi-Chie Liu, Dah-Shyang Tsai, Diah Susanti, Wen-Chang Yeh, Ying-Sheng Huang, Feng-Jiin Liu, “Planar ultracapacitors of miniature interdigital electrode loaded with hydrous RuO2 and RuO2 nanorods” Electrochim. Acta, 55 (2010) 5768-5774.
3. Wen-Zhong Hung, Wen-Hung Chung, Dah-Shyang Tsai, David P. Wilkinson, Ying-Sheng Huang, “CO tolerance and catalytic activity of Pt/Sn/SnO2 nanowires loaded on a carbon paper”, Electrochimica Acta, 55 (2010) 2116-2122.
4. Wen-Hung Chung, Chia-Ching Wang, Dah-Shyang Tsai, Jyh-Chiang Jiang, Yu-Chang Cheng, Liang-Jen Fan, Yaw-Wen Yang, Ying-Sheng Huang, “Deoxygenation of IrO2(110) surface: core-Level spectroscopy and density functional theory calculation”, Surf. Sci., 604 (2010) 118-124.
5. Adrianas Leonardy, Wen-Zhong Hung, Dah-Shyang Tsai, Chen-Chia Chou, Ying-Sheng Huang, “Structural features of SnO2 nanowires and Raman spectroscopy analysis”, Crystal Growth & Design, 9 (2009) 3958-3963.
6. Hun-Chieh Chang, Dah-Shyang Tsai,Wen-Hung Chung, Ying-Sheng Huang, Minh-Vien Le “A ceria layer as diffusion barrier between LAMOX and lanthanum strontium cobalt ferrite along with the impedance analysis”, Solid State Ionics, 180 (2009) 412-417.
7. Xie-Hong Jian, Dah-Shyang Tsai, Wen-Hung Chung, Ying-Sheng Huang, Feng-Jiin Liu, “Pt–Ru and Pt–Mo electrodeposited onto Ir–IrO2 nanorods and their catalytic activities in methanol and ethanol oxidation”, J. Mater. Chem., 19 (2009) 1601-1607.
8. Chia-Liang Cheng, Dah-Shyang Tsai, Jyh-Chiang Jiang, “Energetics and Rate Constants of Si2H6 and Ge2H6 Dissociative Adsorption on Dimers of SiGe(100)-2´1”, J. Phys. Chem. C, 111 [36] (2007) 13466 -13472.
9. Diah Susanti, Dah-Shyang Tsai, Ying-Sheng Huang, Alexandru Korotcov, Wen-Hung Chung, “Structures and Electrochemical Capacitive Properties of RuO2 Vertical Nanorods Encased in Hydrous RuO2”, J. Phys. Chem. C, 111 [26] (2007) 9530-9537.
10.Chi-Chi Shan, Dah-Shyang Tsai, Ying-Sheng Huang, Sie-Hong Jian, Chia-Liang Cheng, “Pt-Ir-IrO2NT Thin-wall Electrocatalysts Derived from IrO2 Nanotubes and Their Catalytic Activities in Methanol Oxidation”, Chem. Mater., 19 [3] (2007) 424-431.

 

 

 

Last Updated: 2010.11.02

 


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