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Ambient Electrosynthesis of Ammonia: Electrode Porosity and Composition Engineering
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Number of Authors: 162018 (English)In: Angewandte Chemie International Edition, ISSN 1433-7851, E-ISSN 1521-3773, Vol. 57, no 38, p. 12360-12364Article in journal (Refereed) Published
Abstract [en]

Ammonia, a key precursor for fertilizer production, convenient hydrogen carrier, and emerging clean fuel, plays a pivotal role in sustaining life on Earth. Currently, the main route for NH3 synthesis is by the heterogeneous catalytic Haber-Bosch process (N-2+ 3H(2) -> 2NH(3)), which proceeds under extreme conditions of temperature and pressure with a very large carbon footprint. Herein we report that a pristine nitrogen-doped nanoporous graphitic carbon membrane (NCM) can electrochemically convert N-2 into NH3 in an acidic aqueous solution under ambient conditions. The Faradaic efficiency and rate of production of NH3 on the NCM electrode reach 5.2% and 0.08 gm(-2) h(-1), respectively. Functionalization of the NCM with Au nanoparticles dramatically enhances these performance metrics to 22% and 0.36 gm(-2) h(-1), respectively. As this system offers the potential to be scaled to industrial levels it is highly likely that it might displace the century-old Haber-Bosch process.

Place, publisher, year, edition, pages
2018. Vol. 57, no 38, p. 12360-12364
Keywords [en]
electrocatalysis, functionalization, nitrogen fixation, poly(ionic liquid), porous carbon membrane
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:su:diva-161074DOI: 10.1002/anie.201805514ISI: 000444225100024PubMedID: 29923667OAI: oai:DiVA.org:su-161074DiVA, id: diva2:1260268
Available from: 2018-11-01 Created: 2018-11-01 Last updated: 2018-11-01Bibliographically approved

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Zhang, XiaohongYuan, Jiayin
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Department of Materials and Environmental Chemistry (MMK)
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