Final Report, DE-FE0031716 [electronic resource]

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Tác giả:

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

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.
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