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Internship oral presentation


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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