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S  0 ``  X*  0 `   Z*  04 `   Z*z  bA޽h @ ?Parchment ̙33 Default Design 0 zr@ ( )   0 P    P*    0<     R*  d  c $ ?    0  @  RClick to edit Master text styles Second level Third level Fourth level Fifth level!     S  6$ `P   P*    6H9 `   R*  H  0޽h ? ̙3380___PPT10. 0X(   $+ X X 0 P    X*  X 0      Z*  X 6T `P   X*  X 6ع `   Z* H X 0޽h ? ̙3380___PPT10.1 0L0 P,V(    0'E V FUEL CELLS0  HfHfJ  C "A KTRE: . " <̙? x @ 0 0 ( <̙? x @L 0 0 ) 0.x m OKNOCKHARDY PUBLISHING(2 f + 0<1"`>B 2008 SPECIFICATIONS>G$G   B  s *޽h ? ̙33y___PPT10Y+D=' = @B +  0L0 0 (  dB  <D)P0Q  0Pp@ 0 0dB @ <D)PXP  0X0@ 0 0@   0 INTRODUCTION This Powerpoint show is one of several produced to help students understand selected topics at AS and A2 level Chemistry. It is based on the requirements of the AQA and OCR specifications but is suitable for other examination boards. Individual students may use the material at home for revision purposes or it may be used for classroom teaching with an interactive white board. Accompanying notes on this, and the full range of AS and A2 topics, are available from the KNOCKHARDY SCIENCE WEBSITE at... www.knockhardy.org.uk/sci.htm Navigation is achieved by... either clicking on the grey arrows at the foot of each page or using the left and right arrow keys on the keyboard (2 2(2 2  75, dB   <D?     0{0P( OKNOCKHARDY PUBLISHING(2    0vX X FUEL CELLS2 (2 $f<fB  s *޽h ? ̙33y___PPT10Y+D=' = @B + 0L0 `#t(  N  0S d CONTENTS Introduction The Proton Exchange Membrane Fuel Cell (PEMFC) PEMFC Cell  theory and electrode reactions Why use fuel cells? Sources of hydrogen Fuel cell vehicles Fuel cells - Advantages Fuel cells  Disdavantages The future of fuel cells Other types of fuel cell L 2`2  6dB  <D)P0Q  0Pp@ 0 0dB  @ <D)PXP   0X0@ 0 0  0ఉX X FUEL CELLS2 (2 $f<f  0C"? @> 0 0  6C"?@D 0 0  6C"? @J 0 0  6C"?H h@P 0 0  6C"?H i @V 0 0  6C"?  @\ 0 0   6C"?  X @b 0 0 ! 6C"?  Y @h 0 0 " 6C"? ` > @s 0 0 # 6C"? ` A@y 0 0B  s *޽h ? ̙33y___PPT10Y+D=' = @B +_ 0 ~ $(  $ $ 0 V FUEL CELLS0 (2 f3 $ 0DʼnD0 INTRODUCTION Fuel cells generate electricity from an electrochemical reaction in which oxygen (from air) and a fuel (e.g. hydrogen) combine to form water. The electricity produced can be used to power cars, buses, laptops and mobile phones. The by-product, heat, can also be used. 6 @ !   dB $ <D)P0Q $ 0Pp@ 0 0dB $@ <D)PXP $ 0X0@ 0 0H $ 0޽h ? ̙33y___PPT10Y+D=' = @B +y  0   @ ,0 (  , , 0щ V FUEL CELLS0 (2 f3 , 08׉D0  INTRODUCTION Fuel cells generate electricity from an electrochemical reaction in which oxygen (from air) and a fuel (e.g. hydrogen) combine to form water. The electricity produced can be used to power cars, buses, laptops and mobile phones. The by-product, heat, can also be used. STRUCTURE " cells consist of two electrodes, a negative anode and a positive cathode " electrodes are separated by a solid or liquid electrolyte " electrically charged particles move between the two electrodes " catalysts (e.g. Pt) are often used to speed up reactions at the electrodes " electricity is generated when oxygen and hydrogen combinep @a@ !W  b dB , <D)P0Q , 0Pp@ 0 0dB ,@ <D)PXP , 0X0@ 0 0H , 0޽h ? ̙33y___PPT10Y+D=' = @B + 0    (    0 _A TYPICAL FUEL CELL0(2f3  0x =' TThe Proton Exchange Membrane Fuel Cell - PEMFC Operation " hydrogen (the fuel) is oxidised to H+ ions (protons) at the anode " protons move through the electrolyte " electrons pass through the external circuit " oxygen is reduced at the cathode " water is produced " a platinum catalyst accelerates the reactions at the electrodes|2 @1 !)  U dB  <D)P0Q  0Pp@ 0 0dB @ <D)PXP  0X0@ 0 0j   Bf3?P  C (Afcell1gq(H  0޽h ? ̙33y___PPT10Y+D=' = @B + 0  $@(    0d.=x n"PROTON EXCHANGE MEMBRANE FUEL CELL0#(2"f3dB  <D)P0Q  0Pp@ 0 0dB @ <D)PXP  0X0@ 0 0P  C (Afcell1gO   0|/=S R (2ff     0 4=C"?,Ws R (2f     07=p e  R (2ff     0,=z p  R (2ff     0|j  R (2ff     0 (=L R (2ff    0lA=, \ s  R (2f    0E=Ll  UANODE (2    0I= ~!  Y CATHT ODE (2     0M=H `  TMEMBRANE (2     0$Q=   R (2ff    0C"?p ~F @ 0 0  <V=C"?zh@ 0 0 @   0C"?v~lL@ 0 0  0C"? x @" 0 0   0C"?lZ@. 0 0 ! 0C"? x @ 0 0 " 0C"? @( 0 0 # 0C"?  @ 0 0 $ <8]=?z <CLICK ON A NUMBER FOR AN EXPLANATION OF WHAT IS TAKING PLACE=(2=  = H  0޽h ? ̙33y___PPT10Y+D=' = @B + 0 $0 5((  ( ( 0Ld=x n"PROTON EXCHANGE MEMBRANE FUEL CELL0#(2"f3dB ( <D)P0Q ( 0Pp@ 0 0dB (@ <D)PXP ( 0X0@ 0 0P ( C (Afcell1gO  ( 0k=S R (2ff    ( 0o=C"?,Ws R (2f    ( 0Ts=p e  R (2ff    ( 0w=z p  R (2ff    ( 0d{=|j @ 0 0 R (2ff    ( 0=L R (2ff   ( 0=, \ s  R (2f   ( 0P=Ll  UANODE (2   ( 0= ~!  Y CATHT ODE (2    ( 0p=H `  TMEMBRANE (2   " ( 0=  > HYDROGEN GAS ENTERS THE CELL& ff   ( 0=   R (2ff   ,( B=C"?zh@ 0 0 @  -( 6C"?v~lL@ 0 0 .( 6C"? x @ 0 0 /( 6C"? @ 0 0 0( 6C"?lZ@+ 0 0 1( 6C"?p ~F @S 0 0 2( 6C"? x @{ 0 0 3( 6C"?  @ 0 0 5( <=?z <CLICK ON A NUMBER FOR AN EXPLANATION OF WHAT IS TAKING PLACE=(2=  = H ( 0޽h ? ̙33y___PPT10Y+D=' = @B +9 0 `X 7$(  $ $ 0=x n"PROTON EXCHANGE MEMBRANE FUEL CELL0#(2"f3dB $ <D)P0Q $ 0Pp@ 0 0dB $@ <D)PXP $ 0X0@ 0 0P $ C (Afcell1gO  $ 0T=S R (2ff    $ 0,=C"?,Ws R (2f    $ 0`=p e  R (2ff    $ 0=z p  R (2ff    $ 0=|j  R (2ff    $ 0=L R (2ff   $ 04=, \ s  R (2f   $ 0 =Ll  UANODE (2   $ 0= ~!  Y CATHT ODE (2    $ 0=H `  TMEMBRANE (2   (" $ 0=  T HYDROGEN IS OXIDISED TO H+ AT THE ANODED+ff  +  $ 0=   R (2ff   ,$ B=C"?zh@ 0 0 @  -$ 6C"?v~lL@ 0 0 .$ 6C"? x @ 0 0 /$ 6C"? @ 0 0 0$ 6C"?lZ@0 0 0 1$ 6C"?p ~F @X 0 0 2$ 6C"? x @ 0 0 3$ 6C"?  @ 0 0& 4$ 04= 0 .2H2(g)  > 4H+(aq) + 4ehff ff f   5$ Bh=C"?zh@ 0 0 @  7$ <=?z <CLICK ON A NUMBER FOR AN EXPLANATION OF WHAT IS TAKING PLACE=(2=  = H $ 0޽h ? ̙33y___PPT10Y+D=' = @B + 0  - (   "   0w  X ELECTRONS TRAVEL VIA THE EXTERNAL CIRCUIT&-ff* -    0twx n"PROTON EXCHANGE MEMBRANE FUEL CELL0#(2"f3dB   <D)P0Q   0Pp@ 0 0dB  @ <D)PXP   0X0@ 0 0P   C (Afcell1gO    0 wS R (2ff     0wC"?,Ws R (2f     0\wp e  R (2ff     0wz p  R (2ff     0pw|j  R (2ff     0DwL R (2ff     0#w, \ s  R (2f     0'wLl  UANODE (2     00w ~!  Y CATHT ODE (2      0@5wH `  TMEMBRANE (2      0d:w   R (2ff   $  BX=C"?zh@ 0 0 @  %  6C"?v~lL@ 0 0 &  6C"? x @ 0 0 '  6C"? @  0 0 (  6C"?lZ@5 0 0 )  6C"?p ~F @] 0 0 *  6C"? x @ 0 0 +  6C"?  @ 0 0 -  <Aw?z <CLICK ON A NUMBER FOR AN EXPLANATION OF WHAT IS TAKING PLACE=(2=  = H   0޽h ? ̙33y___PPT10Y+D=' = @B + 0 (  -(  @"  0HCw  l H+ IONS TRAVEL THROUGH THE ELECTROLYTE AND MEMBRANED7ff 2 7   0PSwx n"PROTON EXCHANGE MEMBRANE FUEL CELL0#(2"f3dB  <D)P0Q  0Pp@ 0 0dB @ <D)PXP  0X0@ 0 0P  C (Afcell1gO   0YwS R (2ff     0D^wC"?,Ws R (2f     0awp e  R (2ff     0Hwz p  R (2ff     0 2H2O(l)!fffffff !  - <1x?z <CLICK ON A NUMBER FOR AN EXPLANATION OF WHAT IS TAKING PLACE=(2=  = H  0޽h ? ̙33y___PPT10Y+D=' = @B + 0 *" -(  H"  04x  t A CATALYST SPEEDS UP THE REACTION BETWEEN OXYGEN AND H+D;ff6  ;   0:xx n"PROTON EXCHANGE MEMBRANE FUEL CELL0#(2"f3dB  <D)P0Q  0Pp@ 0 0dB @ <D)PXP  0X0@ 0 0P  C (Afcell1gO   0@xS R (2ff     0CxC"?,Ws R (2f     0Exp e  R (2ff     0Kxz p  R (2ff     0Ox|j  R (2ff     0HSxL R (2ff    0Wx, \ s  R (2f    08[xLl  UANODE (2    0P_x ~!  Y CATHT ODE (2     0HcxH `  TMEMBRANE (2     0fx   R (2ff    0C"?  @8 0 0 $ BlxC"?zh@ 0 0 @  % 6C"?v~lL@ 0 0 & 6C"? x @ 0 0 ' 6C"? @! 0 0 ( 6C"?lZ@I 0 0 ) 6C"?p ~F @q 0 0 * 6C"? x @ 0 0 - <px?z <CLICK ON A NUMBER FOR AN EXPLANATION OF WHAT IS TAKING PLACE=(2=  = H  0޽h ? ̙33y___PPT10Y+D=' = @B +% 0 LD . (   "   0wx  ( WATER IS PRODUCED&ff      0D}xx n"PROTON EXCHANGE MEMBRANE FUEL CELL0#(2"f3dB   <D)P0Q   0Pp@ 0 0dB  @ <D)PXP   0X0@ 0 0P   C (Afcell1gO    0@xS R (2ff     0ЈxC"?,Ws R (2f     0|xp e  R (2ff     0(xz p  R (2ff     0ԓx|j  R (2ff     0xL R (2ff     0 2H2O(l)ff ff ffff   .  <|x?z <CLICK ON A NUMBER FOR AN EXPLANATION OF WHAT IS TAKING PLACE=(2=  = H   0޽h ? ̙33y___PPT10Y+D=' = @B +  0 2 * &L (  L L 0hx RTHEORY0(2f3 L 0x0 The relevant half reactions are& O2(g) + 4H+(aq) + 4e 2H2O(l) E = +1.23V 2H+(aq) + 2e H2(g) E = 0.00V `!@2^@!f!! !!!!!ff ffff  dB L <D)P0Q L 0Pp@ 0 0dB L@ <D)PXP L 0X0@ 0 0F ?  L $ r8N   L fB  L 6DfolB L <BDfo{>T  L# L)?fB L 6DfolB L <BDfo{F ? L ; 8N  L fB L 6D!olB L <BD!o{>T  L# L)?fB L 6D!olB L <BD!o{H L 0޽h ? ̙33y___PPT10Y+D=' = @B + 0 @ $&lT(  l l 0x RTHEORY0(2f3 l 0y0 NThe relevant half reactions are& O2(g) + 4H+(aq) + 4e 2H2O(l) E = +1.23V 2H+(aq) + 2e H2(g) E = 0.00V The equation with the MORE POSITIVE E value reverses the one with the less positive E value.`!@2^@a!f!! !!!!!ff ffffo  dB l <D)P0Q l 0Pp@ 0 0dB l@ <D)PXP l 0X0@ 0 0  l 0 y0+  H O2(g) + 4H+(aq) + 4e 2H2O(l) H2(g) 2H+(aq) + 2e <I@2f!! !!!!!ffff ff I F ?  l $ r8N   l fB  l 6DfolB l <BDfo{>T  l# L)?fB l 6DfolB l <BDfo{F ? l ; 8N  l fB l 6D!olB l <BD!o{>T  l# L)?fB l 6D!olB l <BD!o{F ? l > 8N  l fB l 6DfolB l <BDfo{>T  l# L)?fB l 6DfolB l <BDfo{F ?  l Y 8N  !l fB "l 6D!olB #l <BD!o{>T  $l# L)?fB %l 6D!olB &l <BD!o{H l 0޽h ? ̙33y___PPT10Y+D=' = @B + 0 0 $&hp(  h h 0"y RTHEORY0(2f3 h 0d(y0 NThe relevant half reactions are& O2(g) + 4H+(aq) + 4e 2H2O(l) E = +1.23V 2H+(aq) + 2e H2(g) E = 0.00V The equation with the MORE POSITIVE E value reverses the one with the less positive E value.`!@2^@a!f!! !!!!!ff ffffo  dB h <D)P0Q h 0Pp@ 0 0dB h@ <D)PXP h 0X0@ 0 00  h 0 ?y0  X O2(g) + 4H+(aq) + 4e 2H2O(l) H2(g) 2H+(aq) + 2e Double the second equation to balance the electrons then combine both to give the overall reaction& HI@2d@Ff!! !!!!!ffff ffe  F ?  h $ r8N   h fB  h 6DfolB h <BDfo{>T  h# L)?fB h 6DfolB h <BDfo{F ? h ; 8N  h fB h 6D!olB h <BD!o{>T  h# L)?fB h 6D!olB h <BD!o{F ? h > 8N  h fB h 6DfolB h <BDfo{>T  h# L)?fB h 6DfolB h <BDfo{F ?  h Y 8N  !h fB "h 6D!olB #h <BD!o{>T  $h# L)?fB %h 6D!olB &h <BD!o{H h 0޽h ? ̙33y___PPT10Y+D=' = @B + 0 P $$p8(  p p 0Zy RTHEORY0(2f3 p 0`y0 NThe relevant half reactions are& O2(g) + 4H+(aq) + 4e 2H2O(l) E = +1.23V 2H+(aq) + 2e H2(g) E = 0.00V The equation with the MORE POSITIVE E value reverses the one with the less positive E value.`!@2^@a!f!! !!!!!ff ffffo  dB p <D)P0Q p 0Pp@ 0 0dB p@ <D)PXP p 0X0@ 0 0 p 0Hwy0   O2(g) + 4H+(aq) + 4e 2H2O(l) H2(g) 2H+(aq) + 2e Double the second equation to balance the electrons then combine both to give the overall reaction& 2H2(g) + O2(g)  > 2H2O(l) E = +1.23VI@2d@F1@2f!! !!!!!ffff ffm       F ?  p $ r8N   p fB  p 6DfolB  p <BDfo{>T   p# L)?fB p 6DfolB p <BDfo{F ? p ; 8N  p fB p 6D!olB p <BD!o{>T  p# L)?fB p 6D!olB p <BD!o{F ? p > 8N  p fB p 6DfolB p <BDfo{>T  p# L)?fB p 6DfolB p <BDfo{F ? p Y 8N  p fB  p 6D!olB !p <BD!o{>T  "p# L)?fB #p 6D!olB $p <BD!o{H p 0޽h ? ̙33y___PPT10Y+D=' = @B + 0  &&dP(  d d 0y RTHEORY0(2f3@ d 0ly0 The relevant half reactions are& O2(g) + 4H+(aq) + 4e 2H2O(l) E = +1.23V 2H+(aq) + 2e H2(g) E = 0.00V The equation with the MORE POSITIVE E value reverses the one with the less positive E value.!@2^@a# s  dB d <D)P0Q d 0Pp@ 0 0dB d@ <D)PXP d 0X0@ 0 0LB d c $DQ 4Q r  d NDy))?  0ELECTRODE REACTIONS Anode (-) 2H2(g)  > 4H+(aq) + 4e OXIDATION Cathode (+) O2(g) + 4H+(aq) + 4e  > 2H2O(l) REDUCTIONH(:@(K fff ff f f ! !! !!!!! !    d 0|y0  P O2(g) + 4H+(aq) + 4e 2H2O(l) H2(g) 2H+(aq) + 2e Double the second equation to balance the electrons then combine both to give the overall reaction& 2H2(g) + O2(g)  > 2H2O(l) E = +1.23VfI@2d@F1@2      F ?  d $ r8N   d fB  d 6DolB d <BDo{>T  d# L)?fB d 6DolB d <BDo{F ? d ; 8N  d fB d 6DolB d <BDo{>T  d# L)?fB d 6DolB d <BDo{F ? d > 8N  d fB d 6DolB d <BDo{>T  d# L)?fB d 6DolB d <BDo{F ?  d Y 8N  !d fB "d 6DolB #d <BDo{>T  $d# L)?fB %d 6DolB &d <BDo{H d 0޽h ? ̙33y___PPT10Y+D=' = @B +O 0 vn &&`(  ` ` 0ly RTHEORY0(2f3 ` 0y0 NThe relevant half reactions are& O2(g) + 4H+(aq) + 4e 2H2O(l) E = +1.23V 2H+(aq) + 2e H2(g) E = 0.00V The equation with the MORE POSITIVE E value reverses the one with the less positive E value.`!@2^@a!f!! !!!!!ff ffffo  dB ` <D)P0Q ` 0Pp@ 0 0dB `@ <D)PXP ` 0X0@ 0 0LB ` c $DQ 4Q r  ` N{))?  0ELECTRODE REACTIONS Anode (-) 2H2(g)  > 4H+(aq) + 4e OXIDATION Cathode (+) O2(g) + 4H+(aq) + 4e  > 2H2O(l) REDUCTIONH(:@(K fff ff f f ! !! !!!!! !    ` 0T{0   O2(g) + 4H+(aq) + 4e 2H2O(l) H2(g) 2H+(aq) + 2e Double the second equation to balance the electrons then combine both to give the overall reaction& 2H2(g) + O2(g)  > 2H2O(l) E = +1.23VI@2d@F1@2f!! !!!!!ffff ffm       F ?  ` $ r8N   ` fB  ` 6DfolB ` <BDfo{>T  `# L)?fB ` 6DfolB ` <BDfo{F ? ` ; 8N  ` fB ` 6D!olB ` <BD!o{>T  `# L)?fB ` 6D!olB ` <BD!o{F ? ` > 8N  ` fB ` 6DfolB ` <BDfo{>T  `# L)?fB ` 6DfolB ` <BDfo{F ?  ` Y 8N  !` fB "` 6D!olB #` <BD!o{>T  $`# L)?fB %` 6D!olB &` <BD!o{H ` 0޽h ? ̙33y___PPT10Y+D=' = @B +  0 .& @(  @ @ 0,7{ dCELL REACTIONS - SUMMARY0(2f3> @ 0>{D09 Anode (-) 2H2(g)  > 4H+(aq) + 4e E = 0.00V OXIDATION Cathode (+) O2(g) + 4H+(aq) + 4e  > 2H2O(l) E = +1.23V REDUCTION overall reaction 2H2(g) + O2(g)  > 2H2O(l) E = +1.23V fff ff f f ! !! !!!!! !       dB @ <D)P0Q @ 0Pp@ 0 0dB @@ <D)PXP @ 0X0@ 0 0LB @ c $D q H @ 0޽h ? ̙33y___PPT10Y+D=' = @B +  0 0 ( D (  D D 0Y{ dCELL REACTIONS - SUMMARY0(2f3@ D 0`{D0o Anode (-) 2H2(g)  > 4H+(aq) + 4e E = 0.00V OXIDATION Cathode (+) O2(g) + 4H+(aq) + 4e  > 2H2O(l) E = +1.23V REDUCTION overall reaction 2H2(g) + O2(g)  > 2H2O(l) E = +1.23V Electrolyte " Carries charged particles from one electrode to the other " It must allow only the appropriate ions to pass between the electrodes " If other substances travel through the electrolyte, they can disrupt the chemical reaction.  F >   !KNa  dB D <D)P0Q D 0Pp@ 0 0dB D@ <D)PXP D 0X0@ 0 0LB D c $D q H D 0޽h ? ̙33y___PPT10Y+D=' = @B + 0 F> (    04}{ 4FUEL CELLS  Why use them?0(2f3  0{D0. ." our society is dependent upon fossil fuels such as coal, oil and gas " fossil fuels are a non-renewable energy resource " fuel prices are rising and resources dwindling " food, transport and electricity costs are affected by fuel prices " the atmosphere is becoming more and more polluted " carbon dioxide contributes to climate change and the greenhouse effect s@s s dB  <D)P0Q  0Pp@ 0 0dB @ <D)PXP  0X0@ 0 0H  0޽h ? ̙33y___PPT10Y+D=' = @B +  0   H (  H H 0܏{ 4FUEL CELLS  Why use them?0(2f3D H 0{D0 |" our society is dependent upon fossil fuels such as coal, oil and gas " fossil fuels are a non-renewable energy resource " fuel prices are rising and resources dwindling " food, transport and electricity costs are affected by fuel prices " the atmosphere is becoming more and more polluted " carbon dioxide contributes to climate change and the greenhouse effect Limitations " storage of hydrogen - safety considerations " transportation of hydrogen - low density so expensive to deliver " feasibility of liquefied hydrogen under pressure - safety considerations " limited life of adsorber / absorber - economic considerations " limited life cycle of cell - economic considerations " high production costs - economic considerations " use toxic chemicals in cell production - environmental considerations?@s !f"$!8f+!!!!-3&W   dB H <D)P0Q H 0Pp@ 0 0dB H@ <D)PXP H 0X0@ 0 0H H 0޽h ? ̙33y___PPT10Y+D=' = @B + 0 0 (    00{ HFUEL CELLS  Manufacture of hydrogen0%(2$f3$  0̹{D0 METHODS " ideally from non-polluting and renewable resources; (solar, wind, hydro) " from hydrocarbon fuels by reforming " from natural gas (methane) or ethanol CH4 + H2O  > CO + 3H2 " electrolysis of water @@ !Lf'3-f3f3f3f3f3f3  dB  <D)P0Q  0Pp@ 0 0dB @ <D)PXP  0X0@ 0 0H  0޽h ? ̙33y___PPT10Y+D=' = @B +i  0   ` 4 (  4 4 0{ HFUEL CELLS  Manufacture of hydrogen0%(2$f3 4 0 {D0Q  d,METHODS " ideally from non-polluting and renewable resources; (solar, wind, hydro) " from hydrocarbon fuels by reforming " from natural gas (methane) or ethanol CH4 + H2O  > CO + 3H2 " electrolysis of water REFORMING Most of today s hydrogen is generated by steam reforming. Unfortunately it uses non-sustainable, natural resources. Fuel is mixed with steam in the presence of a metal catalyst to produce hydrogen and carbon monoxide. This method is cost effective and efficient with conversion rates of 70-80%. @@ @(@@ !tff3Of3  dB 4 <D)P0Q 4 0Pp@ 0 0dB 4@ <D)PXP 4 0X0@ 0 0H 4 0޽h ? ̙33y___PPT10Y+D=' = @B +  0   P 0v (  0 0 0x{ HFUEL CELLS  Manufacture of hydrogen0%(2$f3 0 0~D0m (METHODS " ideally from non-polluting and renewable resources; (solar, wind, hydro) " from hydrocarbon fuels by reforming " from natural gas (methane) or ethanol CH4 + H2O  > CO + 3H2 " electrolysis of water REFORMING Most of today s hydrogen is generated by steam reforming. Unfortunately it uses non-sustainable, natural resources. Fuel is mixed with steam in the presence of a metal catalyst to produce hydrogen and carbon monoxide. This method is cost effective and efficient with conversion rates of 70-80%. STORAGE OF HYDROGEN " liquid stored under pressure or " adsorbed on the surface of a solid or " absorbed within a solidN@@ @(@@Lf3!f%3f3  k dB 0 <D)P0Q 0 0Pp@ 0 0dB 0@ <D)PXP 0 0X0@ 0 0H 0 0޽h ? ̙33y___PPT10Y+D=' = @B +'  0 N F p 8 (  8 8 0T~ HFUEL CELLS  Manufacture of hydrogen0%(2$f3 8 0H~D0m "(METHODS " ideally from non-polluting and renewable resources; (solar, wind, hydro) " from hydrocarbon fuels by reforming " from natural gas (methane) or ethanol CH4 + H2O  > CO + 3H2 " electrolysis of water REFORMING Most of today s hydrogen is generated by steam reforming. Unfortunately it uses non-sustainable, natural resources. Fuel is mixed with steam in the presence of a metal catalyst to produce hydrogen and carbon monoxide. This method is cost effective and efficient with conversion rates of 70-80%. STORAGE OF HYDROGEN " liquid stored under pressure or " adsorbed on the surface of a solid or " absorbed within a solid@@ @(@@!Lf'3-f3f3f3f3f3f3 !tff3Of3!f%3f3  k dB 8 <D)P0Q 8 0Pp@ 0 0dB 8@ <D)PXP 8 0X0@ 0 0H 8 0޽h ? ̙33y___PPT10Y+D=' = @B + 0 @ h(    0@9~A PFUEL CELL VEHICLES (FCV S) - ADVANTAGES 0)(2(f3  0<>~D0   " produce less pollution from exhaust gases (no NOx, CO, unburnt hydrocarbons) " produce less CO2 " are more efficient>g @5    = dB  <D)P0Q  0Pp@ 0 0dB @ <D)PXP  0X0@ 0 0H  0޽h ? ̙33y___PPT10Y+D=' = @B ++  0 R J ` (    0I~ dFUEL CELLS - Advantages 0(2f3  0\O~D0 V" eliminates pollution caused by burning fossil fuels; the only by-product is water " eliminates greenhouse gases if the hydrogen used comes from electrolysis of water " eliminates economic dependence on politically unstable countries for fossil fuel " have a higher efficiency than diesel or gas engines " most operate silently compared to internal combustion engines " some have low heat transmission - ideal for military applications " operating times are much longer than with batteries " maintenance is simple since there are few moving parts in the systemKYYf3X39!BFf383H! K dB  <D)P0Q  0Pp@ 0 0dB @ <D)PXP  0X0@ 0 0H  0޽h ? ̙33y___PPT10Y+D=' = @B +  0 ? 7 P (    0`~ gFUEL CELLS - Disadvantages 0(2f3  0e~D0  @d" production, transportation, distribution and storage of hydrogen is difficult " reforming is technically challenging and not environmentally friendly " refuelling and starting times of fuel cell vehicles (FCV s) are longer " driving range of cars is shorter than in a traditional vehicles " fuel cells are generally slightly bigger than comparable batteries or engines " currently expensive to produce, since most units are hand-made " some use expensive materials " the technology is not yet fully developed and few products are available3UJf3K3D!UCf3!3L!&  W dB  <D)P0Q  0Pp@ 0 0dB @ <D)PXP  0X0@ 0 0H  0޽h ? ̙33y___PPT10Y+D=' = @B + 0 p L(    0x~ dFUEL CELLS - The future 0(2f3   0~~D0  $Limited supplies of fossil fuels may cause us to move to a  hydrogen economy . However " greater acceptance by the public and politicians is necessary " handling and maintenance of hydrogen systems must be safe " improvements to hydrogen manufacturing must be made lOO!  dB  <D)P0Q  0Pp@ 0 0dB @ <D)PXP  0X0@ 0 0H  0޽h ? ̙33y___PPT10Y+D=' = @B +  0   > (    0`~ |0FUEL CELLS  Other types0(2f3  0~D0^ Fuel cells are classified according to the nature of the electrolyte. Alkaline Fuel Cells (AFC) " uses an alkaline electrolyte such as potassium hydroxide " used by NASA in space shuttles Direct Methanol Fuel Cells (DMFC) " uses a polymer membrane as an electrolyte " a catalyst on the anode draws hydrogen from liquid methanol " eliminates need for a fuel reformer, so pure methanol can be used as fuel Molten Carbonate Fuel Cells (MCFC) " uses a molten carbonate salt as the electrolyte. " has the potential to be fuelled with coal-derived fuel gases, methane / natural gas Phosphoric Acid Fuel Cells (PAFC) " anode and a cathode made of a finely dispersed platinum catalyst on carbon " has a silicon carbide structure that holds the phosphoric acid electrolyte " used to power many commercial premises and large vehicles, such as busesYGf_f#ffff$33#!!! Y dB  <D)P0Q  0Pp@ 0 0dB @ <D)PXP  0X0@ 0 0H  0޽h ? ̙33y___PPT10Y+D=' = @B +q  0   ( (    0H~ |0FUEL CELLS  Other types0(2f3  0̭~D0  Fuel cells are classified according to the nature of the electrolyte. Proton Exchange Membrane Fuel Cells (PEMFC) " uses a polymeric membrane as the electrolyte, with platinum electrodes " operate at relatively low temperatures. " can vary their output to meet shifting power demands. " best for cars, for buildings and smaller applications Solid Oxide Fuel Cells (SOFC) " use solid ceramic electrolytes; eg zirconium oxide stabilised with yttrium oxide " work at high temperatures " can reach efficiencies of around 60 per cent " are expected to be used for generating electricity and heat in industry " have potential for providing auxiliary power in vehicles Regenerative Fuel Cells (RFC) " produce electricity from hydrogen and oxygen " can be reversed to produce hydrogen and oxygen; effectively storing energyCG-!!3)33f}ff&   dB  <D)P0Q  0Pp@ 0 0dB @ <D)PXP  0X0@ 0 0H  0޽h ? ̙33y___PPT10Y+D=' = @B + 0L0 "@(   X @dB  @@ <D)PXP @ 0X0@ 0 0 @ <̙? x @D 0 0J @ C "A KTRE: . @ 0~x m g-2010 JONATHAN HOPTON & KNOCKHARDY PUBLISHING.(2. f @ 0 ~fM  ATHE END(2f "@ 0~E V FUEL CELLS0  HfHfH @ 0޽h ? ̙33y___PPT10Y+D=' = @B +r@)V=2~U8 LC\ mp *4v<I;@Xa?J(v3cf qpw?L/byxg[Oh+'0T hp  No Slide TitleHOPTONJONATHAN HOPTON1143Microsoft PowerPoint@eݗx@@hNx@0GSg  )'    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