Campus Units

Chemical and Biological Engineering, Ames Laboratory

Document Type

Article

Research Focus Area

Renewable Energy

Publication Version

Accepted Manuscript

Publication Date

7-21-2019

Journal or Book Title

Green Chemistry

Volume

21

Issue

14

First Page

3839

Last Page

3845

DOI

10.1039/C9GC01338E

Abstract

The lithium-mediated pathway provides a promising way for facile and selective dissociation of nitrogen for ammonia synthesis. However, the prevailing electro-deposition of lithium, especially when coupled to the anodic oxygen evolution from water or hydroxide, presents disadvantages including the use of expensive Li-ion conducting ceramics (LISICON) or high temperature operation of molten salts. In this study, a membrane-free approach based on the immiscibility of aqueous/organic electrolytes was adopted for lithium electro-deposition, which could be utilized for subsequent nitridation and ammonia synthesis. We found that a biphasic system of aqueous 1 M LiClO4 and 1 M LiClO4/propylene carbonate reinforced with PMMA (poly(methyl methacrylate)) acts the same as a LISICON-based aqueous/organic hybrid electrolyte system, but without any physical membrane. With a fairly high faradaic efficiency (FE) of 57.2% and a production rate of 1.21 × 10−9 mol cm−2 s−1 for ammonia synthesis, this membrane-free approach and its application to ammonia synthesis provide an innovative way to the advancements in next-generation energy storage technologies.

Comments

This is a manuscript of an article published as Kim, Kwiyong, Yifu Chen, Jong-In Han, Hyung Chul Yoon, and Wenzhen Li. "Lithium-mediated ammonia synthesis from water and nitrogen: a membrane-free approach enabled by an immiscible aqueous/organic hybrid electrolyte system." Green Chemistry 21, no. 14 (2019): 3839-3845. DOI: 10.1039/C9GC01338E. Posted with permission.

Copyright Owner

The Royal Society of Chemistry

Language

en

File Format

application/pdf

Published Version

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