High-yield electrochemical upgrading of CO2 into CH4 using large-area protonic ceramic electrolysis cells
Pan, Zehua 1Duan, Chuancheng 2Pritchard, Tyler 3Thatte, Amogh 3White, Erick 4Braun, Robert 3O'Hayre, Ryan 3Sullivan, Neal P.3
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作者信息
1. Harbin Inst Technol
2. Kansas State Univ
3. Colorado Sch Mines
4. Natl Renewable Energy Lab
折叠
Abstract
Electrochemical production of commodity chemicals via CO2-H2O co-electrolysis using solid oxide electrolysis cells presents a promising cost-effective energy-storage approach. Here, we harness the unique property of protonic ceramic electrolysis cells (PCEC) and demonstrate direct electrochemical production of CH4 from CO2-H2O in a PCEC unit-cell stack. An exceptional CH4-yield ratio of 34.6% from only CO2-H2O reactants and greater than 70% with exhaust H-2 recycle were achieved under an electrolysis current of -1 A cm(-2) at 450 degrees C. Additionally, the electrochemical co-conversion of CO2-H2O offered a higher CH4-yield ratio compared to the thermochemical conversion of CO2-H-2 under certain operating conditions, indicating possible electrochemical promotion of catalytic CO2 methanation. Techno-economic analyses were conducted to reveal potential operating conditions that yield a promising levelized cost of fuel production. The demonstrated good performance of the unit-cell stack shows promising scalability of PCECs for practical application from a system-level viewpoint.
Key words
Protonic ceramic electrolysis cells/Electrochemical CO2 upgrading/Direct high-yield CH4 production/Electrochemical promotion of catalysis (EPOC)/Energy conversion and storage/OPERATING-CONDITIONS/METHANE PRODUCTION/HIGH-PERFORMANCE/FUEL-CELLS/PROMOTION/CONVERSION/TRANSPORT/MEMBRANE/HYDROGENATION/GENERATION
NSTL
Elsevier