Improved electrochemical conversion of CO2 to multicarbon ...
Integrated Electrochemical Systems for Scalable CO2 ...
Transcript of Integrated Electrochemical Systems for Scalable CO2 ...
Integrated Electrochemical Systems
for Scalable CO2 Conversion to Chemical Feedstocks
Implementing organizations: The University of TokyoOsaka UniversityRIKENUbe Industries, Ltd.Shimizu CorporationChiyoda CorporationFurukawa Electric Co., Ltd.
Project Manager: SUGIYAMA Masakazu, The University of Tokyo
Chemical Plant
Electrochemical
CO2 EnrichmentElectrolysis
CO2
Useful
ChemicalsAtmospheric
CO2
Physical Absorption
of CO2 Capture
City
Electric Power
Renewable Energy
Project Manager: SUGIYAMA Masakazu
Professor, Research Center for Advanced Science and Technology, The University of Tokyo
Educational background:Ph.D Chemical System Engineering, The University of Tokyo (March 2000).M.Sc. Chemical System Engineering, The University of Tokyo (March 1997).B. Sc. Chemical System Engineering, The University of Tokyo (March 1995).
Professional background:2000: Research Associate, Department of Chemical System Engineering, School of Engineering, The University of Tokyo2002: Lecturer, Department of Electronic Engineering, School of Engineering, The University of Tokyo2005: Associate Professor, Department of Electronic Engineering, School of Engineering, The University of Tokyo2016: Professor, Department of Electrical Engineering and Information Systems, School of Engineering, The University of Tokyo2017: Professor, Research Center for Advanced Science and Technology, The University of Tokyo
Research fields
High-efficiency solar cells using III-V semiconductors
Global network of renewable fuelSolar Fuel production, renewable H2 and CO2 utilization
Metal
Solar H2Concentrator PVs
H2 carrier
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Project overview
CO2
CO2
in flue gas
CO2
in the atmosphere
CO2 Capture / Enrichment
Enriched CO2
CO2
CO2
Enriched CO2
O2
High Value Materials
CO2 ElectroreductionChemical
Raw Materials
Renewable Energy
EnrichedCO2
Reduction products
H2O
O2
①-1 Physical adsorption methodShimizu Corp.
①-2 Electrochemical methodOsaka Univ.
②-1 CO2 reduction catalystA:Ube Industries, Ltd.B:Furukawa Electric Co., Ltd.②-2 Electrolysis reactor A:RIKENB:Osaka Univ.
③-1 Integrated system control, Characteristic analysis, LCA
The Univ. of Tokyo
③-2 Development of reaction process & Process integration
Chiyoda Corp.
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Towards highly-selective, energy-efficient CO2 conversion
Redox potential is close to the value of H2 evolution.
Similar redox potential for different products➔Issue of product selectivity
Multi-electron reactions➔ Issue of reaction rate
Issues
0.20
0.15
0.10
0.05
0.00
-0.05
-0.10
-0.15
-0.20
Pote
ntial (V
vs. S
HE
)
2H+ + 2e- ⇄ H2
CO2 + 2H+ + 2e-⇄ CO + H2O
CO2 + 8H+ + 8e-⇄ CH4 + 2H2O
2CO2 + 12H+ + 12e-⇄ C2H4 + 4H2O
@ pH=0
CO2
C2H4
CO2
-
GDE
H2O
O2
+
C2H4
Our approachCu catalysts
Carbon particles
Design of reaction environment
Faraday EfficiencyC2H4: 51%EtOH: 35%
0 200 400 600 800 1000 1200 14000
10
20
30
40
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60
70
80
90
100
110
120
FE
/ %
Time / min
H2
CO
CH4
C2H4
EtOH
FA1 M KHCO3
I = - 200 mAcm-2I = -130 mAcm-2
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Social implementation
High-valuematerials
Pipeline/Cylinder CO2
CO2 capture from buildings
CO2 capture→ Reduction in air intake from outdoor→ Energy saving in air conditioning
Scalable plant size for electrochemical reactors
C2H4
CO2Direct air capture
High-valuematerials
Thermo-chemicalprocess
ElectrochemicalCO2 reduction