catalytic hydrogen production - aps physics · catalytic hydrogen production ... nano-fibers in...
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Catalytic hydrogen production
J. K. NørskovCenter for Atomic-scale Materials Physics
Technical University of [email protected]
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Hydrogen production strategies
• Reforming of hydrocarbons • Reforming of biomass• Electrolysis• Photolytic conversion• Biological conversion • …..
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Steam reformingCH4+H2O 3H2+CO
DH= +206 kJ/mol
Ni catalyst
Rostrup-Nielsen, Sehested, NørskovAdv. Catal. 47, 65 (2002)
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The atomic-scale picture
Ni(111)
Ni(211)
Bengaard, Nørskov, Sehested, Clausen, Nielsen, Molenbroek, Rostrup-Nielsen: J. Catal. 209, 365 (2002)
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Problems
1. Carbon formation
2. Metal dusting
3. Too much CO
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Formation of CarbonNano-fibers
In situ (high temperatureand pressure) TransmissionElectron Microscopy (TEM)
The movies:http://www.haldortopsoe.com/site.nsf/all/EOTT-5VTMPT?OpenDocumentHelveg, Cartes, Sehested, Hansen, Clausen, Rostrup-Nielsen, Abild-Pedersen, NørskovNature 327, 426 (2004)
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The role of steps
Helveg, Cartes, Sehested, Hansen, Clausen, Rostrup-Nielsen, Abild-Pedersen, NørskovNature 327, 426 (2004)
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Carbon nucleation at steps
Ni(211)
Bengaard, Nørskov, Sehested, Clausen, Nielsen, Molenbroek, Rostrup-Nielsen: J. Catal. 209, 365 (2002)
Extra bonding at step
Ni(111)
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Step blockingMD simulation – Au/Ni
Molenbroek, Nørskov, ClausenJ. Phys. Chem. B 105, 5450 (2001)
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Catalyst design at the nano-scale
Besenbacher, Chorkendorff, Clausen, Hammer, Molenbroek, Nørskov, Stensgaard, Science 279, 1913 (1998)
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Too much CO
S. Gottesfeld et al., J. Electrochem. Soc. 148 (2001) A11.
CO poisons PEM fuel cell:CO is a product:
CH4+H2O 3H2+CO
Possible solutions:
• Make fuel cell lessCO poisoned
• Remove CO
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CO blocks for hydrogen adsorption at the anode
H coverage in the presence of CO:
T=80 oC ∆ECO=-1.4 eV ∆EH2=-0.5 eV
ΘHx104
ppm CO in 1 bar H2
Christoffersen, Liu, Ruban, Skriver, Nørskov: J.Catal. 199, 123 (2001)
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New 3-component alloys from DFT
Ru
PtM PtRu
Pure Fe Co Rh Ir Ni Pd Pt Cu Ag Au Sn
0,00
0,03
0,06
0,09
0,12
0,15
0,18
DE C
O-1
/2 D
E H2
(eV
) PtRuNiPtRuCo
Measure of competitionBetween CO and H:
DECO-1/2 DEH2
Pt M
Strasser, Fan, Devenney, Weinberg, Liu , Nørskov, J. Phys. Chem.B, 107, 11013 (2003)
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Combinatorial ElectrochemistryElectrochemical Multi-electrode array
64 addressable electrodes
PhotolitographicFabrication
Symyx Technologiesproprietary US Patent No 6,187,164; 5,985,356; 6,004,617.
Additional US and foreign patents pending
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Results from parallel screening experiments Strasser, Fan, Devenney, Weinberg
Symyx Technologies
Rel
ativ
e ar
ea-n
orm
aliz
ed a
ctiv
ityLo
g [ (
I allo
y/A
allo
y,re
al) /
(IPt
/APt
,real
)]
0.00
0.40
0.80
1.20
1.60
Pt
Pt60Ru40
Pt60Co20Ru20
Pt40Co40Ru20
Pt20Co60Ru20
Pt60Ni20Ru20
Pt40Ni40Ru20 Pt20Ni60Ru20
Strasser, Fan, Devenney, Weinberg, Liu, Nørskov J. Phys. Chem.B 107, 11013 (2003)
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-5
-4
-3
-2
-1
0
1
2
3
CO(g)+2H2O(g)
CO(a)+2H2O(g)
CO(a)+2H2O(a)CO2(a)+2H(a)+H2O(a)
CO2(a)+H2(g)+H2O(a)
CO2(g)+H2(g)+H2O(g)
Au
Ag
Cu
Pd
Pt
CoNi
Ru
RhIr
CO(a)+ 2H(a) +O(a) +H2O(a)
Disproportionation : OH* + OH* H2O* + O*
CO(a)+H(a)
+OH(a)+ H2O(a)
Complete Dissociation : OH* +* O* + H*
CO(a)+2H(a)
+2OH(a)
Ener
gy (e
V)
Water gas shift: Thermochemistry
Courtesy of M. Mavrikakis – UW Madison
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Nano effects in catalysisCO oxidation on Au particles supported on TiO2
Valden, Lai, Goodman, Science 281, 1647 (1998)
Wahlström, Lopez, Schaub, Thostrup, Rønnau, Africh, Lægsgaard, Nørskov,Besenbacher, PRL 90, 026101 (2003)
No generally accepted explanation yet!
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Reforming of biomass
Huber, Shabaker, Dumesic, Science 300, 2075–2077 (2003).
Reforming of oxygenated hydrocarbons over Raney-NiSn.
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Electrolysis
Cathode: 2(H++e-) H2
Anode: H2O ½ O2 +2 H+____________________________________
Total: H2O ½ O2 +H2
DG0 =2.46 eV (1.23 eV/electron)
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The overpotentialNi-based electrolyzer: U = U0 + hcathode + hanode+ I R
Efficiency:
%65~~ 9.123.1
)(0
VV
iUU
Wendt, Imarisio, J. Appl. Electrochem. 17, 1 (1988)
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Photovoltaics+electrolyzer
12% x 65% = 7.8%
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The origin of the overpotential
Kitchin, Bligaard, Stimming, NørskovEven larger barriers at the anode!
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A Pt/Pt cell
Khaselev, Bansal, Turner, Int. J. Hydrogen Energy 26, 127 (2001)
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Biomimetic hydrogen production
The active site
Gloaguen, Lawrence, Rauchfuss, JACS 123, 9476 (2001)
Siegbahn, Blomberg, Wirstam, CrabtreeJ. Biological Inorganic Chemistry. 6, 460 (2001)
Hydrogenase catalyses
H++e- ½H2
Add active site to electrode?
Or make structure with
similar properties?
Lamle, Vincent, Halliwell, Albracht,
Armstrong, Dalton Trans. 2003 4152
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Biomimetic hydrogen production IINitrogenase:
Hinnemann, Nørskov, JACS 126, 3920 (2004)
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The grand challenge
Understand relationship between surface structure and catalytic properties
Use insight for rational (atomic-scale) design of new catalysts
• Theory• Model experiments• Synthesis of new nano particle catalysts• Testing and characterization
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Thanks toB. Hinnemann, K. Honkala, T. Bligaard, H. Beengaard, F. Abild-Pedersen,
P. Liu, A. Logadottir, I. ChorkendorffCenter for Atomic scale Materials Physics, Technical University of Denmark
F. Besenbacher, E. Vestergaard, R. VangCenter for Atomic scale Materials Physics, University of Aarhus
S. Helveg, B. S. Clausen, J. Rostrup-Nielsen, J. Sehested, A. MolenbroekHaldor Topsøe
J. R. Kitchin, M. A. Barteau, J. G. ChenUniversity of Delaware
P. Strasser, H. WeinbergSymyx
U. StimmingTechnical University Munich
M. MavrikakisUniversity of Wisconsin, Madison