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

6

Target of carbon recycle in CO2 emission from Japan

1100 mil.

ton/y

Annual CO2 emission from Japan

100 mil. ton/y

Energy saving

CO2-free hydrogen

Sectors that are difficult to decarbonize

Electrification

Renewable power sources

Methods for decarbonization

missing zone

Target of carbon recycling