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ChemSusChem. 2018 Jan 10;11(1):120-124. doi: 10.1002/cssc.201701975. Epub 2017 Nov 23.

Electrochemical Synthesis of Ammonia from Water and Nitrogen: A Lithium-Mediated Approach Using Lithium-Ion Conducting Glass Ceramics.

Author information

1
Department of Civil and Environmental Engineering, Korea Advanced Institute of Science of Technology, Daejeon, 34141, Republic of Korea.
2
Graduate school of EEWS and KAIST Institute NanoCentury, Korea Advanced Institute of Science of Technology, Daejeon, 34141, Republic of Korea.
3
CO2 Energy Vector Research Group, Korea Research Institute of Chemical Technology, Daejeon, 34114, Republic of Korea.
4
Advanced Materials and Devices Laboratory, Korea Institute of Energy Research, Daejeon, 34129, Republic of Korea.
5
School of Chemical and Biological Engineering and Institute of Chemical Processes, Seoul National University, Seoul, 08826, Republic of Korea.
6
Clean Fuel Laboratory, Korea Institute of Energy Research, Daejeon, 34129, Republic of Korea.
7
Energy Saving Laboratory, Korea Institute of Energy Research, Daejeon, 34129, Republic of Korea.

Abstract

Lithium-mediated reduction of dinitrogen is a promising method to evade electron-stealing hydrogen evolution, a critical challenge which limits faradaic efficiency (FE) and thus hinders the success of traditional protic-solvent-based ammonia electro-synthesis. A viable implementation of the lithium-mediated pathway using lithium-ion conducting glass ceramics involves i) lithium deposition, ii) nitridation, and iii) ammonia formation. Ammonia was successfully synthesized from molecular nitrogen and water, yielding a maximum FE of 52.3 %. With an ammonia synthesis rate comparable to previously reported approaches, the fairly high FE demonstrates the possibility of using this nitrogen fixation strategy as a substitute for firmly established, yet exceedingly complicated and expensive technology, and in so doing represents a next-generation energy storage system.

KEYWORDS:

ammonia; faradic efficiency; lithium; lithium nitrides; nitrogen fixation

PMID:
29105332
DOI:
10.1002/cssc.201701975
[Indexed for MEDLINE]

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