A New Technology for Efficient, High Yield Carbon Dioxide and Water Transformation to Methane by Electrolysis in Molten Salts
A New Technology for Efficient, High Yield Carbon Dioxide and Water Transformation to Methane by Electrolysis in Molten Salts
复制标题
熔盐电解高效、高产二氧化碳和水转化为甲烷的新技术
DOI：
10.1002/admt.201600092
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发表时间：
2016-09-01
影响因子：
6.8
通讯作者：
Licht, Stuart
中科院分区：
文献类型：
--
作者：
Wu, Hongjun;Ji, Deqiang;Licht, Stuart
本研究为二氧化碳的可持续利用提供了一种新的绿色技术。如果合成甲烷的生产效率高且碳足迹低，那么它可以在现有的能源、制造和运输行业中随时替代天然气。第一个技术的生产甲烷从二氧化碳和水的熔融电解证明。该技术比通过微生物、水溶液或固体氧化物电解或各种光催化工艺生产可再生甲烷更有效。甲烷的产生速率是光电化学系统中观察到的速率的1000倍，并且没有贵金属或外部氢源。添加的蒸汽和CO2不断更新电解质。CO2和H2O通过电解直接转化，在600 °C碱金属碳酸盐/LiOH电解质中，在低（<2 V）能量下，在250 mA的恒定电流下，通过20 cm 2铁和镍电极，电流效率为97.4%。电解产物由64.9%的甲烷、34.8%的H2和0.3%的比C1长的烃组成。
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 CO2 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 CO2 continuously renew the electrolyte. CO2 and H2O are directly transformed by electrolysis at 97.4% current efficiency at a constant current of 250 mA through 20 cm2 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% H2, and 0.3% longer (than C1) hydrocarbons.