Non-aqueous gas diffusion electrodes for rapid ammonia synthesis from nitrogen and water-splitting-derived hydrogen

被引：337

作者：

Lazouski, Nikifar ^{[1
]}

Chung, Minju ^{[1
]}

Williams, Kindle ^{[1
]}

Gala, Michal L. ^{[1
]}

Manthiram, Karthish ^{[1
]}

机构：

[1] MIT, Dept Chem Engn, Cambridge, MA 02139 USA

来源：

NATURE CATALYSIS | 2020年 / 3卷 / 05期

基金：

美国国家科学基金会;

关键词：

ELECTROCHEMICAL SYNTHESIS; REDUCTION; PRESSURE; ELECTROSYNTHESIS; ELECTRIFICATION;

D O I：

10.1038/s41929-020-0455-8

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Electrochemical transformations in non-aqueous solvents are important for synthetic and energy storage applications. Use of non-polar gaseous reactants such as nitrogen and hydrogen in non-aqueous solvents is limited by their low solubility and slow transport. Conventional gas diffusion electrodes improve the transport of gaseous species in aqueous electrolytes by facilitating efficient gas-liquid contacting in the vicinity of the electrode. Their use with non-aqueous solvents is hampered by the absence of hydrophobic repulsion between the liquid phase and carbon fibre support. Herein we report a method to overcome transport limitations in tetrahydrofuran using a stainless steel cloth-based support for ammonia synthesis paired with hydrogen oxidation. An ammonia partial current density of 8.8 +/- 1.4 mA cm(-2) and a Faradaic efficiency of 35 +/- 6% are obtained using a lithium-mediated approach. Hydrogen oxidation current densities of up to 25 mA cm(-2) are obtained in two non-aqueous solvents with near-unity Faradaic efficiency. The approach is then applied to produce ammonia from nitrogen and water-splitting-derived hydrogen.

引用

页码：463 / +

页数：9

共 43 条

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