Download - Fuel cell
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Fuel Cell Technology
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Topics
1. A Very Brief History2. Electrolysis3. Fuel Cell Basics
- Electrolysis in Reverse- Thermodynamics- Components- Putting It Together
4. Types of Fuel Cells- Alkali- Molten Carbonate- Phosphoric Acid- Proton Exchange Membrane- Solid Oxide
5. Benefits6. Current Initiatives
- Automotive Industry- Stationary Power Supply Units- Residential Power Units
7. Future
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A Very Brief History
Considered a curiosity in the 1800’s. The first fuel cell was built in 1839 by Sir William Grove, a lawyer and gentleman scientist. Serious interest in the fuel cell as a practical generator did not begin until the 1960's, when the U.S. space program chose fuel cells over riskier nuclear power and more expensive solar energy. Fuel cells furnished power for the Gemini and Apollo spacecraft, and still provide electricity and water for the space shuttle.(1)
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Electrolysis“What does this have to do with fuel cells?”
By providing energy from a battery, water (H2O) can be dissociated into the diatomic molecules of hydrogen (H2) and oxygen (O2).
Figure 1
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Fuel Cell Basics“Put electrolysis in reverse.”
fuelcell
H2OO2
H2
heat
work
The familiar process of electrolysis requires work to proceed, if the process is put in reverse, it should be able to do work for us spontaneously.
The most basic “black box” representation of a fuel cell in action is shown below:
Figure 2
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Fuel Cell BasicsThermodynamics
H2(g) + ½O2(g) H2O(l)
Other gases in the fuel and air inputs (such as N2 and CO2) may be present, but as they are not involved in the electrochemical reaction, they do not need to be considered in the energy calculations.
69.91 J/mol·K205.14 J/mol·K130.68 J/mol·KEntropy (S)
-285.83 kJ/mol00Enthalpy (H)
H2O (l)O2H2
Table 1 Thermodynamic properties at 1Atm and 298K
Enthalpy is defined as the energy of a system plus the work needed to make room for it in an environment with constant pressure.
Entropy can be considered as the measure of disorganization of a system, or as a measure of the amount of energy that is unavailable to do work.
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Fuel Cell BasicsThermodynamics
Enthalpy of the chemical reaction using Hess’ Law:ΔH = ΔHreaction = ΣHproducts – ΣHreactants
= (1mol)(-285.83 kJ/mol) – (0)
= -285.83 kJ
Entropy of chemical reaction:ΔS = ΔSreaction = ΣSproducts – ΣSreactants
= [(1mol)(69.91 J/mol·K)] – [(1mol)(130.68 J/mol·K) + (½mol)(205.14 J/mol·K)]
= -163.34 J/K
Heat gained by the system:ΔQ = TΔS
= (298K)(-163.34 J/K)= -48.7 kJ
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Fuel Cell BasicsThermodynamics
The Gibbs free energy is then calculated by:
ΔG = ΔH – TΔS = (-285.83 kJ) – (-48.7 kJ) = -237 kJ
The external work done on the reaction, assuming reversibility and constant temp.W = ΔG
The work done on the reaction by the environment is:
The heat transferred to the reaction by the environment is:
W = ΔG = -237 kJ
ΔQ = TΔS = -48.7 kJ
More simply stated: The chemical reaction can do 237 kJ of work and produces 48.7 kJ of heat to the environment.
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Fuel Cell BasicsComponents
Anode: Where the fuel reacts or "oxidizes", and releases electrons.
Cathode: Where oxygen (usually from the air) "reduction" occurs.
Electrolyte: A chemical compound that conducts ions from one electrode to the other inside a fuel cell.
Catalyst: A substance that causes or speeds a chemical reaction without itself being affected.
Cogeneration: The use of waste heat to generate electricity. Harnessing otherwise wasted heat boosts the efficiency of power-generating systems.
Reformer: A device that extracts pure hydrogen from hydrocarbons.
Direct Fuel Cell: A type of fuel cell in which a hydrocarbon fuel is fed directly to the fuel cell stack, without requiring an external "reformer" to generate hydrogen.
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Fuel Cell BasicsPutting it together.
Figure 3
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Types of Fuel Cells
The five most common types:
•Alkali•Molten Carbonate•Phosphoric Acid•Proton Exchange Membrane•Solid Oxide
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Types of Fuel Cells
Vorteil: Keine aufwendige Brenngas-AufbereitungNachteil: Hohe Betriebstemperaturen = Hohe System-Kosten Starke Material-Beanspruchung
SOFC
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Alkali Fuel Cell
compressed hydrogen and oxygen fuel
potassium hydroxide (KOH) electrolyte
~70% efficiency
150˚C - 200˚C operating temp.
300W to 5kW output
requires pure hydrogen fuel and platinum catylist → ($$)liquid filled container → corrosive leaks
Figure 4
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Molten Carbonate Fuel Cell (MCFC)
carbonate salt electrolyte
60 – 80% efficiency
~650˚C operating temp.
cheap nickel electrode catylist
up to 2 MW constructed, up to 100 MW designs exist
Figure 5
The operating temperature is too hot for many applications.
carbonate ions are consumed in the reaction → inject CO2 to compensate
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Phosphoric Acid Fuel Cell (PAFC)
phosphoric acid electrolyte
40 – 80% efficiency
150˚C - 200˚C operating temp
11 MW units have been tested
sulphur free gasoline can be used as a fuel
Figure 6
The electrolyte is very corrosive
Platinum catalyst is very expensive
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Proton Exchange Membrane (PEM)
thin permeable polymer sheet electrolyte
40 – 50% efficiency
50 – 250 kW
80˚C operating temperature
electrolyte will not leak or crack
temperature good for home or vehicle use
platinum catalyst on both sides of membrane → $$
Figure 7
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Solid Oxide Fuel Cell (SOFC)
hard ceramic oxide electrolyte
~60% efficient
~1000˚C operating temperature
cells output up to 100 kW
high temp / catalyst can extract the hydrogen from the fuel at the electrode
high temp allows for power generation using the heat, but limits use
SOFC units are very large
solid electrolyte won’t leak, but can crack
Figure 8
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Benefits
Efficient: in theory and in practice
Portable: modular units
Reliable: few moving parts to wear out or break
Fuel Flexible: With a fuel reformer, fuels such as natural gas, ethanol, methanol, propane, gasoline, diesel, landfill
gas,wastewater, treatment digester gas, or even ammonia can be used
Environmental: produces heat and water (less than combustion in both cases)
near zero emission of CO and NOx
reduced emission of CO2 (zero emission if pure H2 fuel)
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Material‘s challenges of the PEM Fuel Cell
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04/11/23 Fuel Cell Fundamentals 20
Review of Membrane (Nafion) Properties
• Chemical Structure• Proton Conduction Process• Water Transport and Interface Reactions
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PSSApoly(styrene-co-styrenesulfonic acid) (PSSA)
Nafion,TM Membrane C
Dow
PESA(Polyepoxy-succinic Acid)
,,-Trifluorostyrene grafted onto poly(tetrafluoro-ethylene) with post-sulfonation)
Poly – AMPSPoly(2-acrylamido-2-methylpropane sulfonate)
Chemical structures of some membrane materials
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Nafion Membrane
Chemical Structure
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Nafion Membrane
Proton Conduction Process
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The water transport through Nafion Membrane
Water flux due to electroosmotic drag (mol/cm2 s) is: Nw, drag = I()/F.Where: I is the cell current, () is the electroosmotic drag coefficient at a given state of membrane hydration (=N(H2O)/N(SO3H) and F is the Faraday constant. This flux acts to dehyddrate the anode side of a cell and to introduce additional water at the cathode side.
The buildup of water at the cathode (including the product water from the cathode reaction) is reduced, in turn, by diffusion back down the resulting water concentration gradient (and by hydraulic permeation of water in differentially pressurized cells where the cathode is held at higher overall pressure). The fluxes (mol/cm2 s) brought about by the latter two mechanisms within the membrane are:
Nw,diff = -D()c/ z, Nw,hyd = -khyd()P/ zwhere D is the diffusion coefficient in the ionomer at water content , c/ z is a water concentration gradient along the z-direction of membrane thickness, khyd is the hydraulic permeability of the membrane, and P/ z is a pressure gradient along z.
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The water transport through Nafion Membrane
Many techniques have been introduced to prevent the dehydration of the anode (including the introduction of liquid water into the anode and/or cathode, etc. – which, however, can lead to “flooding” problems that inhibit mass transfer).However, the overall question of “water management,” including the issue of drag as a central component, has been solved to a very significant extent by the application of sufficiently thin PFSA membranes (<100 µm thick) in PEFCs, combined with humidification of the anode fuel gas stream.An example of a development specifically enabling this to an extreme degree is the developmental composite membrane introduced W. L. Gore that provides usable mechanical properties for very thin (20 µm and less) perfluorinated membranes with high protonic conductivity.
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Water Transport (& Interface Reactions) in Nafion Membrane of the PEM Fuel Cell
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Material‘s challenges of the SOFC
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SOFCSolid Oxide Fuel Cell
Air side = cathode: High oxygen partial pressure
1conductance
d
Fuel side= anode: H2 + H2O= low oxygen partial pressure
H2 + 1/2O2 H2O
H2
O2
H2O
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SOFCElectromotive Force (EMF)
Chemical Reactions in 2 separated compartements:- Cathode (Oxidation): - Anode (Reduction):
½O2 + 2e- O2-
H2 + O2- H2O + 2e-
EMF of a galvanic Cell:
EMF = Gr /-z F
G = Free Enthalpie
z = number of charge carriers
F = Faraday Constant
G0= Free Enthalpie in standart state
R = Gas Constant
SOFC: ½O2 + H2 H2O 2
0 0.52 2
ln( ) ( )
a H OG G RT
a H a O
difference of G between anode und cathode
2
2
ln4
p ORTEMK
F p O
K
A
Nernst Equation:
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SOFCElektrochemische Potential
Oxygen ions migrate due to an electrical and chemical gradient
2 2( ) ( ) 2O O F
2( )O
ChemicalPotential
ElectricalPotential
Electrochemichal Potential
Driving force for the O2- Diffusion through the electrolyte are the different oxygen partial pressures at the anode and the cathode side:
2( )2
iij O
F
ji = ionic current
i= ionic conductivity
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SOFCengl. Open Circuit Voltage (OCV)
2( )2
iij O
F
2 2( ) ( ) 2O O F
2( ) 0O
What happems in case :
0ij No currentElectrical potential difference = chemical potetialOCV
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SOFCLeistungs-Verluste
Under load decrease of cell voltageand internal losses
U(I) = OCV - I(RE+ RC+RA) - C - A
(RE+ RC+RA)OCV
C
A
cell current I [mA/cm2]
cell
volta
ge U
(I)
[V] Ohmic resistances
Non ohmic resistances= over voltages
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SOFCÜberspannungen
Over voltages exist at interfaces of• Elektrolyte - Cathode• Elektrolyte - Anode
Reasons:
•Kinetic hindrance of the electrochemical reactions•Bad adheasion of electrode and electrolyte•Diffusion limitations at high current densities
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SOFCOhm‘s losses
800nm
Kathode Anode
Reduce electrolyte thickness
Past Future
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SOFCLeistungs-Verluste
(1)Open circuit voltage (OCV), I = 0(2)SOFC under Load U-I curve(3) Short circuit, Vcell = 0
0.0 0.5 1.0 1.5 2.00.0
0.2
0.4
0.6
0.8
1.0
900°Cin Luft/Wasserstoff
Stromdichte [A/cm2]
Zells
pa
nn
un
g [
V]
0.0
0.1
0.2
0.3
0.4
0.5
Le
istun
g [W
/cm 2]
(1)
(2)
(3)
(RE+ RC+RA)OCV
C
A
cell current I [mA/cm2]
cell
volta
geU
(I)
[V] (RE+ RC+RA)
OCV
C
A
cell current I [mA/cm2]
cell
volta
geU
(I)
[V]
1
23
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SOFC
( )*
U LR f T
I A
0 log( )aE
T kT
1. aT vs E
T
Electrical resistance:
Electrical conductivity: U : voltage [V]I : current [A]R : resistivity [ohm]L : distance between both inner wires [cm]A : sample surface [cm2] : conductivity [S/m]Ea : activation energy [eV]T : temperature [K]K : Boltzmann constant
How to determine the electrical conductance
Iin
pu
tU
measu
red
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SOFC
SOFC-Designs
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SOFC
Tubular designi.e. Siemens-Westinghouse design
Planar designi.e. Sulzer Hexis, BMW design
Segment-type tubular design
SOFC Design
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SOFCTubular Design – Siemens-Westinghouse
air flow anode (fuel)
cathode interconnection
cathode (air)
Why was tubular design developed in 1960s by Westinghouse?• Planar cell: Thermal expansion mismatch between ceramic and support structures leads to problems with the gas sealing tubular design was invented
Advantages of tubular design:• At cell plenum: depleted air and fuel react heat is generated incoming oxidant can be pre-heated. • No leak-free gas manifolding needed in this design !
Drawback of tubular design:• Electric current flows along circumference of anode and cathode high cell losses
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SOFC
anode (fuel)
cathode (air)
electrolyte
Tubular Design – Siemens-Westinghouse
To overcome problems new Siemens-Westinghouse „HPD-SOFC“ design:
New: Flat cathode tube with ligaments
Advantages of HPD-SOFC:• Ligaments within cathode short current pathways decrease of ohmic resistance• High packaging density of cells compared to tubular designSiemens-Westinghouse shifted from
basic technology to cost reduction and scale up.
Power output: Some 100 kW can be produced.
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SOFCPlanar Design – Sulzer Hexis
anode (fuel)
electrolyte
cathode (air)
interconnect Advantages of planar design:• Planer cell design of bipolar plates easy stacking no long current pathways• Low-cost fabrication methods, i.e. Screen printing and tape casting can be used.
Drawback of tubular design:• Life time of the cells 3000-7000h needs to be improved by optimization of mechanical and electrochemical stability of used materials.
Power output: 1 kW is aimed.
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SOFCPlanar Design – BMW
electrolyteanode
porous metallic substrateFe-26Cr-(Mo, Ti, Mn, Y2O3) alloy
cathodeCathode current collector
bipolar plate
bipolar plate
Air channel
Fuel channel
20-50 m
5-20 m
15-50 m
Plasma spray
Plasma spray
Plasma spray
ApplicationBatterie replacement in the BMW cars of the 7-series.
Power output: 135 kW is aimed.
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Current InitiativesAutomotive Industry
Most of the major auto manufacturers have fuel cell vehicle (FCV) projects currently under way, which involve all sorts of fuel cells and hybrid combinations of conventional combustion, fuel reformers and battery power.
Considered to be the first gasoline powered fuel cell vehicle is the H20 by GM:
GMC S-10 (2001)fuel cell battery hybridlow sulfur gasoline fuel25 kW PEM40 mpg112 km/h top speed
Figure 9
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Fords Adavanced Focus FCV (2002)fuel cell battery hybrid85 kW PEM~50 mpg (equivalent)4 kg of compressed H2 @ 5000 psi
Approximately 40 fleet vehicles are planned as a market introduction for Germany, Vancouver and California for 2004.
Current InitiativesAutomotive Industry
Figure 10
Figure 11
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Daimler-Chrysler NECAR 5 (introduced in 2000)
85 kW PEM fuel cell
methanol fuel
reformer required
150 km/h top speed
version 5.2 of this model completed a California to Washington DC driveawarded road permit for Japanese roads
Current InitiativesAutomotive Industry
Figure 12
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Mitsubishi Grandis FCV minivan
fuel cell / battery hybrid
68 kW PEM
compressed hydrogen fuel
140 km/h top speed
Plans are to launch as a production vehicle for Europe in 2004.
Current InitiativesAutomotive Industry
Figure 13
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Current InitiativesStationary Power Supply Units
A fuel cell installed at McDonald’s restaurant, Long Island Power Authority to install 45 more fuel cells across Long Island, including homes.(2) Feb 26, 2003
More than 2500 stationary fuel cell systems have been installed all over the world - in hospitals, nursing homes, hotels, office buildings, schools, utility power plants, and an airport terminal, providing primary power or backup. In large-scale building systems, fuel cells can reduce facility energy service costs by 20% to 40% over conventional energy service.
Figure 14
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Current InitiativesResidential Power Units
There are few residential fuel cell power units on the market but many designs are undergoing testing and should be available within the next few years. The major technical difficulty in producing residential fuel cells is that they must be safe to install in a home, and be easily maintained by the average homeowner.
Residential fuel cells are typically the size of a large deep freezer or furnace, such as the Plug Power 7000 unit shown here, and cost $5000 - $10 000.
If a power company was to install a residential fuel cell power unit in a home, it would have to charge the homeowner at least 40 ¢/kWh to be economically profitable.(3) They will have to remain a backup power supply for the near future.
Figure 15
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Future
“...projections made by car companies themselves and energy and automotive experts concur that around 2010, and perhaps earlier, car manufacturers will have mass production capabilities for fuel cell vehicles, signifying the time they would be economically available to the average consumer.” Auto Companies on Fuel Cells, Brian Walsh and Peter Moores, posted on www.fuelcells.org
Technical and engineering innovations are continually lowering the capital cost of a fuel cell unit as well as the operating costs, but it is expected that mass production will be of the greatest impact to affordability.
A commercially available fuel cell power plant would cost about $3000/kW, but would have to drop below $1500/kW to achieve widespread market penetration. http://www.fuelcells.org/fcfaqs.htm
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Future
internal combustion obsolete?
solve pollution problems?
common in homes?
better designs?
higher efficiencies?
cheaper electricity?
reduced petroleum dependency?
...winning lottery numbers?
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References
(1) FAQ section, fuelcells.org(2) Long Island Power Authority press release: Plug Power Fuel Cell Installed at McDonald’s Restaurant, LIPA to Install 45 More Fuel Cells Across Long Island, Including Homes, http://www.lipower.org/newscenter/pr/2003/feb26.fuelcell.html(3) Proceedings of the 2000 DOE Hydrogen Program Review: Analysis of Residential Fuel Cell Systems & PNGV Fuel Cell Vehicles, http://www.eere.energy.gov/hydrogenandfuelcells/pdfs/28890mm.pdf
Figures1, 3 http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/electrol.html4 – 8 http://fuelcells.si.edu/basics.htm10 http://www.moteurnature.com/zvisu/2003/focus_fcv/focus_fcv.jpg11 http://www.granitestatecleancities.org/images/Hydrogen_Fuel_Cell_Engine.jpg12 http://www.in.gr/auto/parousiaseis/foto_big/Necar07_2883.jpg13 http://www3.caradisiac.com/media/images/le_mag/mag138/oeil_mitsubishi_grandis_big.jpg14 http://www.lipower.org/newscenter/pr/2003/feb26.fuelcell.html15 http://americanhistory.si.edu/csr/fuelcells/images/plugpwr1.jpg
Table 1 http://hyperphysics.phy-astr.gsu.edu/hbase/tables/therprop.html#c1
Fuel cell data from: Types of Fuel Cells, fuelcells.org
Fuel Cell Vehicle data primarily from: Fuel Cell Vehicles (From Auto Manufacturers) table, fuelcells.org