Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Internship oral presentation

1,402 views

Published on

Published in: Technology, Business
  • Be the first to comment

  • Be the first to like this

Internship oral presentation

  1. 1. Nanopowder Synthesis Nanopowder Synthesis for Solid Oxide Fuel for Solid Oxide Fuel Cells Anodes Cells DO QUANG Anodes Anh MaiSupervisors:Prof. François GitzhoferYan Shen (PhD)July 5th 2012 CREPE – Faculté de génie- Université de Sherbrooke Internship Master 2 IC
  2. 2. CONTENTS I. Laboratory Overview III. Project & Objectives V. SOFC Fundamentals VII. Methodology IX. Results & Discussions XI. Conclusion & Future workAnh Mai DO QUANG 2
  3. 3. I. LABORATORY OVERVIEW Centre de Recherche en Energie, Plasma et Electrochimie (CREPE)Mission : develop new materials by using plasma processDirector : François Gitzhofer , ing. PhDResearch themes :• Development of materials for solid oxide fuel cell (SOFC);• Synthesis of nanopowder;• Synthesis of new catalysts based on nanoscale materials by using plasma technology;• Application in nano-structured and new compositions of coating deposition to improve the performances of aircraft turbines and diesel engines;• Biomedical application (synthesis of bio-materials for prosthetic bones). Anh Mai DO QUANG 3
  4. 4. I. PROJECT & OBJECTIVES PROJECTSolid Oxide Fuel Cells (SOFC) :• Applications : auxiliary power units in vehicles to stationary power generation with outputs from 100 W to 2 MW• Advantages : clean device, high efficiency, flexibility in the choice of fuel, internal gas reforming, no moving part…• Project :- Work on SOFC anode materials within the NSERC Solid Oxide Fuel Cells Canada Strategic Research Network- Synthesis of nanoscale material by using plasma technologyAnh Mai DO QUANG 4
  5. 5. I. PROJECT & OBJECTIVES OBJECTIVES• SOFC anode material : Lanthane Doped Ceria – Lanthane Doped with Strontium titanate – Yttria Stabilized Zirconia• Nanopowder synthesis with a pure nanostructured phase of La0.4Ce0.6O2• Contribution to the anode coating deposition of a suspension of : – La0.4Sr0.6TiO3 and yttria-stabilized zirconia on a thin disk – La0.4Ce0.6O2 - La0.4Sr0.6TiO3 - yttria-stabilized zirconia on a thin disk The coating must be porous, homogeneous and provide a good boundary at the anode/electrolyte interfaceAnh Mai DO QUANG 5
  6. 6. I. SOFC FUNDAMENTALS HOW DOES A SOLID OXIDE FUEL CELL WORK? – 3 main components : Anode – Electrolyte – Cathode – Cathode reaction : O2 + 4e- → 2O2- – Anode reactions : H2 + O2- → H2O + 2e- CO + O2- → CO2 + 2e- – Reformer reaction : CxH2x+2 + xH2O → xCO + (X+2)H2 – Operating temperature : 600°C-1000 °C Anh Mai DO QUANG 6
  7. 7. Internal Reformer Supported SOFC Operation Principle e e e e eGreen – Bio – Regular e OxygenDiesel H+ Water H H e O HO e2 H2 + O2 = 2 H2O C O eCO + ½ O2 = CO2 O O C e O Electrolyte Water + CO2 Reformer Anode Cathode 600-700˚C
  8. 8. I. SOFC FUNDAMENTALS ANODE REQUIREMENTS – Stable in a reducing environment – Suitable porosity – Thermal expansion coefficient (TEC) similar to the other components – Tolerance to sulfur (5000 ppm) – Catalytic activity towards electro-oxidation of fuels – High electronic conductivity – Sufficient ionic conductivityAnh Mai DO QUANG 8
  9. 9. I. METHODOLOGY• Synthesis of LDC powder by solution plasma spraying Solution of La0.4Ce0.6O2 is made of La(NO3)3•6H2O and Ce(NO3)3•6H2O Plasma torch Tekna PL - 50 Torch nozzle diameter 45 mm Central plasma gas (Ar) 27 slpm Sheath plasma gases (O2) 80 slpm Atomization gas (Ar) 11.4 slpm Plasma power 35-40 kW Chamber pressure 150 Torrs Solution injection flow rate 5-4 ml/min Anh Mai DO QUANG 9
  10. 10. Solution Torch VacuumReactor Porous metal filter Filter Unit
  11. 11. I. METHODOLOGY• Deposition of La0.4Sr0.6TiO3 – Yttria Stabilized Zirconia on a thin Yttria Stabilized Zirconia disk (~380 µm) by suspension plasma spraying – Solution of La0.4Sr0.6TiO3 + suspension of Yttria Stabilized Zirconia nanopowder. • The solution of La0.4Sr0.6TiO3 was made of a nitrate solution of lanthanum and strontium which was stirred with titanium propoxide and triethanolamine – Several tests of the disks in the plasma with varied parameters (spraying distance, power…)Anh Mai DO QUANG 11
  12. 12. I. RESULTS & DISCUSSIONS• Lanthanum Doped Ceria XRD : First Synthesis Plasma power 35 kW Solution concentration 1 mol/L Solution injection flow rate 5 ml/minAnh Mai DO QUANG 12
  13. 13. I. RESULTS & DISCUSSIONS• Lanthanum Doped Ceria XRD : Second Synthesis Plasma power 40 kW Solution concentration 0,8 mol/L Solution injection flow rate 4 ml/minAnh Mai DO QUANG 13
  14. 14. I. RESULTS & DISCUSSIONS• Lanthanum Doped Ceria TEM : Second SynthesisAnh Mai DO QUANG 14
  15. 15. I. RESULTS & DISCUSSIONS• Coating deposition of LST-YSZ on the thin substrate Proper deposition way and suitable plasma parameters of preventing the YSZ disks from cracking have been finished The quality of the coating still needs to be improvedAnh Mai DO QUANG 15
  16. 16. CONCLUSION AND FUTURE WORK CONCLUSION Lanthanum Doped Ceria powder synthesis : suitable parameters have been found to obtain a pure phase Lanthanum doped Strontium Titanate – Yttria Stabilized Zirconia deposition : suitable parameters for the survival of disk have been found but not for the quality of the coating FUTURE WORK: – Lanthanum Doped Ceria powder : Do the synthesis again – Coating deposition of Lanthanum doped Strontium Titanate – Yttria Stabilized Zirconia : overcome the thermal shock problem (micro- heater), new substrate – Do experiments for Lanthanum Doped Ceria – Lanthanum Doped with Strontium titanate – Yttria Stabilized ZirconiaAnh Mai DO QUANG 16
  17. 17. ACKNOWLEDGEMENT SPECIAL THANKS TO :o Prof. François Gitzhofer, for his general supervision and his advice during the internship;o Yan Shen, a PhD candidate, for following me up during this internship;o Kossi Béré, the lab technician, for his precious help during the experiments;o Mingwen Guo, a Master candidate, for his assistance ;o Stéphane Gutierrez and Charles Bertrand for their work to the sample characterization ;o SOFC Canada for their funding support and for their invitation to the SOFC annual general meeting at Calgary.Anh Mai DO QUANG 17

×