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A New Technology for Efficient, High Yield Carbon Dioxide and Water Transformation to Methane by Electrolysis in Molten Salts
Author(s) -
Wu Hongjun,
Ji Deqiang,
Li Lili,
Yuan Dandan,
Zhu Yanji,
Wang Baohui,
Zhang Zhonghai,
Licht Stuart
Publication year - 2016
Publication title -
advanced materials technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.184
H-Index - 42
ISSN - 2365-709X
DOI - 10.1002/admt.201600092
Subject(s) - electrolysis , methane , electrolysis of water , hydrogen production , carbon dioxide , chemistry , carbon fibers , high temperature electrolysis , inorganic chemistry , electrolyte , materials science , waste management , hydrogen , electrode , organic chemistry , composite number , engineering , composite material
This study presents a new green technology for the sustainable utilization of carbon dioxide. Synthetic methane, if produced efficiently and with low carbon footprint, provides a ready replacement for natural gas in the existing energy, manufacturing, and transportation industries. The first technology for the production of methane from CO 2 and water by molten electrolysis is demonstrated. The technology is more efficient than alternative renewable methane production by microbial, aqueous, or solid oxide electrolysis, or than various photocatalytic processes. Methane is produced at 1000‐fold the rate observed in photoelectrochemical systems, and without noble metals or an external hydrogen source. Added steam and CO 2 continuously renew the electrolyte. CO 2 and H 2 O are directly transformed by electrolysis at 97.4% current efficiency at a constant current of 250 mA through 20 cm 2 iron and nickel electrodes in a 600 °C alkali carbonate/LiOH electrolyte at low (<2 V) energy. The electrolysis product is comprised of 64.9% methane, 34.8% H 2 , and 0.3% longer (than C1) hydrocarbons.