Ethics and DesignSchechner Equations, Tables, Graphs 1 פרק 6 משוואות, טבלאות וגרפים.

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  • Slide 1
  • Ethics and DesignSchechner Equations, Tables, Graphs 1 6 ,
  • Slide 2
  • Ethics and DesignSchechner Equations, Tables, Graphs 2 4 , ( ) 3 2 , 1 , ,
  • Slide 3
  • Ethics and DesignSchechner Equations, Tables, Graphs 3 The current density, J L [mA/cm 2 ], was calculated from: Bubis E., L. Mor, N. Sabag, Z. Rubin, U. Vaysban, K. Hemmes and P. Schechner, "Electrical Characterization of a Glucose-Fueled Alkaline Fuel Cell", Fourth International ASME Conference on Fuel Cell Science, Engineering and Technology, 8 pages, 2006.
  • Slide 4
  • Ethics and DesignSchechner Equations, Tables, Graphs 4 The volume enthalpy of combustion, ( c H 0 ) V, of glucose and octane, given in the Introduction, was calculated using the relation: ( c H 0 ) V = ( c H 0 /MW) x [kJ/cm 3 ] (4) where c H 0 is the molar heat of combustion of a substance at 25 0 C 41 and is the density. Other data used are given in Table 6. Schechner P., E. Kroll, E. Bubis, S. Chervinsky and E. Zussman, "Silver-plated Electrospun Fibrous Anode for Glucose Alkaline Fuel Cells", Journal of The Electrochemical Society, 154, 9, 2007.
  • Slide 5
  • Ethics and DesignSchechner Equations, Tables, Graphs 5 R FC was measured using two different methods. The first, the "Voltage Divider" method [16], assumes that the voltage V IRC obeys: where i c is the circuit's current when the cell voltage is V IRC. Bubis E., L. Mor, N. Sabag, Z. Rubin, U. Vaysban, K. Hemmes and P. Schechner, "Electrical Characterization of a Glucose-Fueled Alkaline Fuel Cell", Fourth International ASME Conference on Fuel Cell Science, Engineering and Technology, 8 pages, 2006.
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  • Ethics and DesignSchechner Equations, Tables, Graphs 6 Tables 8 4 6 5 ( -3)3 / 2 1 , 7
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  • Ethics and DesignSchechner Equations, Tables, Graphs 7 Comparison with other published results. Table 5 lists recently published performance parameters obtained with fuel cells fueled with glucose and methanol, working with inorganic anodic catalysts. For comparison, results obtained in the present work with the SC 0.90 membrane are also shown. All the Pt/Co/Ni anodes reported in Table 5 were supplied by Hong Kong University. 10
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  • Ethics and DesignSchechner Equations, Tables, Graphs 8 PP D [mW/c m 2 ] OCV [V] Electrolyte Fuel conc. [M] Me m- bra ne Anode catalyst Ref.Fuel 0.1960.3851.00 M KOH0.80NoAgThis work Glucose 0.370.780.35 M KOH0.22NoPt/Co/Ni[16] 0.610.740.87 M KOH0.89NoPt/Co/Ni[17] 3.000.857.00 M NaOH1.00NoPt/Co/Ni[10] 2.56 c 0.79PEM1.00 b YesPt/Ru[11] a 13.860.935.00 M KOH2.00NoPt/C/Ni[14]Methanol 5.560.701.00 M KOH2.47NoPt/Co/Ni[12] a a Values for this work were calculated from the published data. b T = 600C. Fuel solution under flow. c Maximum power density. Anode poisoning at current densities > 8.0 mA/cm 2. Table 5: Recent reports on similar fuel cells.
  • Slide 9
  • Ethics and DesignSchechner Equations, Tables, Graphs 9 in Air N.A 4200 graphite 197.3 118.1 -19.3 64.7 78.4 125.5 -161.6 -252.9 Boiling Point [C] N.A. 400 410 427 300 470 363 220 632 571 Auto- ignition [C] Flammability [%] N.A. 18.4 12 N.A. 66 44 15.7 5 12 73 Interval N.A. 3.2 - 21.6 4 16 7 - 73 6 - 50 3,3 - 19 1 - 61 - 6 4 - 16 4 - 77 Limits Glucose Carbon Ethylene Glycol Acetic Acid Formaldehyde Methanol Ethanol Octane Methane Hydrogen Fuel
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  • Ethics and DesignSchechner Equations, Tables, Graphs 10 V " [m/sec]nm]] 3.00E+08--------------- 3.38E+077.34E+076.52E+08 3.69E+079.98E+068.11E+07 3.84E+072.26E+061.76E+07 5.57E+077.43E+054.00E+06 2.53E+086.65E+047.89E+04 2.56E+086.74E+037.89E+03 2.60E+085.10E+025.88E+02
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  • Ethics and DesignSchechner Equations, Tables, Graphs 11 6 .5 , .4 3 2 -x, 1 , , , xy
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  • Ethics and DesignSchechner Equations, Tables, Graphs 12 Figure 3. Fuel cell voltage as a function of time during three consecutive connectdisconnect cycles. R L = (1) 80.4 , (2) 66.4 , (3) 55.6 . SC 3.3 . anode.
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  • Ethics and DesignSchechner Equations, Tables, Graphs 13 Figure 6. Polarization curve, V(J), obtained with the different anodes: solid foil control (PAg), SC 3.3 and SC 0.90 .
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  • Ethics and DesignSchechner Equations, Tables, Graphs 14 Polymer International Polym Int 55:825833 (2006) Preparation and characterization of ultrafine electrospun polyacrylonitrile fibers and their subsequent pyrolysis to carbon fibers Juthawan Sutasinpromprae, 1 Sujinda Jitjaicham, 1 Manit Nithitanakul, 1 Chidchanok Meechaisue 2 and Pitt Supaphol 1 : , ASME Sutasinpromprae J. et al.
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  • Ethics and DesignSchechner Equations, Tables, Graphs 15 Figure 2. Viscosity, conductivity, and surface tension of PAN solutions and average diameter of the obtained electrospun PAN fibers as a function of solution concentration. The applied electrostatic field strength was 20 kV/15 cm.
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  • Ethics and DesignSchechner Equations, Tables, Graphs 16 2 , .1 , , ,
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  • Ethics and DesignSchechner Equations, Tables, Graphs 17 Membrane preparation.Figure 1 shows the experimental setup for the preparation of the PCL fiber membranes. Solution A (A1 or A2) was pumped into a syringe fitted with a 25 gauge needle. An electrical field of about 1 kV/cm was applied between the solution and a horizontally rotating disk cathode by a high voltage transformer (Glassman Inc. High Voltage Power Supply). The rotating velocity of the cathode (10-cm radius) was 30 rpm. The needle was placed vertically downward with the tip about 15 cm above the cathode. The flow rate through the needle was 3 ml/h. Fibers for each mat were collected for about 1 hour of electrospinning, and then dried n vacuum for 24 hours.
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  • Ethics and DesignSchechner Equations, Tables, Graphs 18 Figure 1. Schematic description of the electrospinning system with the horizontally-rotating fiber collector.
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  • Ethics and DesignSchechner Equations, Tables, Graphs 19 The fuel cell.Measurements were taken on an AFC fueled with glucose using KOH as the electrolyte (HKU-002C, Fuel Cell Research Lab., Dept. of Chemistry, Hong Kong University). The cell is schematically shown in Fig. 2.
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  • Ethics and DesignSchechner Equations, Tables, Graphs 20 Figure 2. Schematic of the fuel cell and the experimental setup.
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  • Ethics and DesignSchechner Equations, Tables, Graphs 21 : Excel . -x ,. -y , W Planck: WW 2 hc 2 5 1 e hc/k T - 1 W cm 2 m 2 hc 2 = 3.74 x 10 -16 [W m 2 ] hc/k = 1.44 x 10 -2 [m 0 K ] W [W/m 3 ] x 10 -10 = W [W/cm -2 m]
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  • Ethics and DesignSchechner Equations, Tables, Graphs 22 T : T 1 = 300 0 K T 2 = 500 0 K T 3 = 700 0 K
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  • Ethics and DesignSchechner Equations, Tables, Graphs 23 112.1 212.3 311.9. 412.0 512.2 613.8 712.3 811.8 911.9 1012.0 1112.2 1212.1 1312.0 1 - 2 - -3 3 - 4 -
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  • Ethics and DesignSchechner Equations, Tables, Graphs 24 x x x x x x x x 1 4 2 . 3 4 x 4 - 5 - 6 - -3 , x