Dissertation > Excellent graduate degree dissertation topics show

Study of Pd Based Anodic Catalysts for Alkaline Direct Methanol Fuel Cell

Author: WangMeiLi
Tutor: HuangChengDe
School: Tianjin University
Course: Applied Chemistry
Keywords: fuel cell electro-oxidation methanol alkaline PdNiO/C PdCexPr1-xO2-δ PdMnO2/C
CLC: TM911.4
Type: Master's thesis
Year: 2007
Downloads: 162
Quote: 0
Read: Download Dissertation

Abstract


NiO、CexPr1-xO2-δ and MnO2 were prepared by impregnating, sol-gel and hydrothermal method, respectively. Then these oxides and Pd were mixed to make the PdMOx/C（M=Ni、CexPr1-x、Mn） catalysts by chemistry reduction in aqueous solution.Several techniques such as XRD, XPS, BET, cyclic voltammetry（CV）, chronoamperometry, chronopotentiometry and A. C. Impedance were used to study the physical properties and electrochemical performances of the in-house synthesized catalysts.For PdNiO/C, The catalyst prepared at such condition presents the highest activity: reduction temperature is 70℃, the ratio between Pd and Ni is 8:2, Reducing Agent is NaBH4, real-time adjust the value of pH when adding PdCl2 solution. The optimal PdNiO/C catalyst shows higher catalytic activity and extremely good poisoing-tolerative compared with the Pd/C catalyst with the same account of Pd loading. By heat-treatment, the NiO is disengaged from Pd lattice, the particle size of catalysts increase, and the catalytic activity of catalyst which is provided with higher crystalline and lower dispersing reduce.For PdCexPr1-xO2-δ/C（x=0.7） catalysts, the performance is in term of this order: 900℃>700℃>500℃>no heat-treatment. When Ce:Pr=7:3, ratio between Pd and the oxide is 2:1, The sample exhibit the highest activity. Reduction temperature is irrelevant to the performance. When the x=0.7, Pr3+ inter the lattice of CeO2 completely. A great deal of oxygen-hole forms in the catalysts by adding Pr6O11. It is favorable to form sample with high dispersing and small particle size. All factor above get the PdCexPr1-xO2-δ（x=0.7） catalysts more powerful to the electro-oxidation of methanol and CO. The real area of catalyst do not increase by adding Pr6O11.For PdMnO2/C, when the ratio of KMnO4 and MnSO4 is 3:1 （at. %）. the ratio between Pd and MnO2 is 5:1, the catalyst presents the highest activity. Compared with the Pd/C catalyst, the optimal PdMnO2/C catalyst shows higher catalytic activity and extremely good poisoing-tolerative. The shape of complex plane plots of the impedance on PdMnO2/C at different potential is dissimilar. The shape of arc in the high frequency at different potential is similar.

Related Dissertations

  1. Study on the Preparation of Biodiesel from Fried Oil with Supercritical Methanol,TE667
  2. Numerical Analysis of Flow Process in a Molten Carbonate Fuel Cell,TM911.4
  3. Fabrication of Membrane Electrode Assembly for PEMFC,TM911.4
  4. Multi-walled Carbon Nanotubes Au _AT_ of Pt, Au _AT_ of Pd core-shell structure of the catalyst preparation and electrochemical properties of,O643.36
  5. Applied research in the sugar cane juice clarification process of alkaline pectinase,TS244.2
  6. Pt -based catalysts of direct methanol fuel cells,TM911.4
  7. Morphology Control Synthesis and Anode Electrocatalysis Performance of Pt/Pd-based Catalysts for Fuel Cell,TM911.4
  8. Study on the Synthesis of the Polypyrrole-Cobalt Oxides and Their Catalytic Behavior for the Electroreduction of H2O2,O643.32
  9. LSGM electrolyte thin films and electrochemical properties of,TM911.4
  10. Direct Oxidation of Primary Alcohols to Methyl Esters Catalyzed by Nano-Au/SBA-16 Catalyst,TQ225.241
  11. Effects of Methanol Application on the Growth of the Radish (Raphanus Sativus), and Host Preference and Damage by Plutella Xylosterra, Phyllotreta Striolata, Myzus Persicae, and Liriomyza Sativae to Methanol-Treated Radish,S436.31
  12. Flow injection spectrophotometric determination of organophosphorus pesticides in environmental water research,O657.32
  13. Nano Pt / SiC Preparation, Characterization and Electrochemical Catalytic Performance,TM911.4
  14. Qinghai Oilfield grid refining 300,000 tons of methanol project evaluation,F426.72
  15. Study on Influential Factor to Methane Metabolic of Methane-utilizing Bacteria and Methoanol Detection Method,Q93
  16. (Class ) perovskite -type oxides catalytic elimination of N 2 O,X701
  17. The Three Metallic Materials porcelain crown turn of the gingival sulcus fluid alkaline phosphatase and aspartate aminotransferase levels,R783
  18. Synthesis and Modification of SAPO-34 Molecular Sieve Catalyst for Methanol-to-Olefin Reaction,TQ221.2
  19. Simulation and Emulation of Methanol Distillation Process in Large-scale Coal Chemical Industry,TQ223.121
  20. Simulation and Analysis of Methanol Production in Coal Chemical Industry,TQ223.121
  21. Electricity Generation from Swine Wastewater in Microbial Fuel Cell, Microbial Community Analysis, and Isolation of Electricigens,X71

CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Chemical power sources,batteries, fuel cells > Fuel cell
© 2012 www.DissertationTopic.Net  Mobile