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
3
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.
4
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
50
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
5
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