Final Report, DE-FE0031716 [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 333.82 Fossil fuels
• Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. Office of the Assistant Secretary of Energy for Fossil Energy ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2022
• Mô tả vật lý: Medium: ED : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 267822
• Chủ đề: 1. 01 coal, lignite, and peat; 2. 10 synthetic fuels; 3. 20 fossil-fueled power plants; 4. Co2 utilization; 5. Electrolysis

Tóm tắt

Electrochemical upgrading of CO2 into hydrocarbon fuels via CO2?H2O co-electrolysis using solid oxide electrolysis cells (SOECs) presents an encouraging approach to cost-effective storage of renewable power. In this study, we harness the unique property of protonic ceramic electrolysis cells (PCEC) and demonstrate direct electro-catalytic production of CH4 from CO2?H2O in a unit-cell stack configuration. The unit-cell stack was developed to evaluate the scalability and the applicability of PCECs from a broader system-level viewpoint. Tradeoffs between operating conditions and performance metrics were explored and thoroughly characterized. An exceptional CH4-yield ratio of 34.6% from only CO2?H2O reactants was achieved under an electrolysis current of 1 A cm?2 at 450 �C. With exhaust-H2 recycle, this value was boosted to greater than 70%. In addition, the electrochemical co-conversion of CO2?H2O offers a higher CH4-yield ratio compared to traditional thermo-catalytic conversion of CO2?H2 under certain operating conditions, indicating possible electrochemical promotion of catalytic CO2 methanation. The demonstrated good performance is a promising result for further scale-up and for the practical utilization of electrochemical CO2 upgrade using PCECs. Techno-economic analyses reveal operating conditions that yield cost-competitive levelized cost of fuel production.