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Ammonia Generation via a Graphene-Coated Nickel Catalyst

Center for Electrochemical Engineering Research (CEER), Chemical and Biomolecular Engineering Department, Ohio University, Columbus, OH 43210, USA
Author to whom correspondence should be addressed.
Academic Editors: Jordi Sort and Eva Pellicer
Coatings 2017, 7(6), 72;
Received: 25 March 2017 / Revised: 7 May 2017 / Accepted: 16 May 2017 / Published: 27 May 2017
(This article belongs to the Special Issue Thin Films and Patterned Structures by Electrochemical Methods)
PDF [6159 KB, uploaded 27 May 2017]


A novel graphene-coated Ni electrode was developed in this investigation to improve corrosion resistance while unexpectedly enhancing the ammonia generation rate in the electrochemically induced urea to ammonia (eU2A) process, which is an electrochemical onsite ammonia generation method. The development of the electrode is crucial for the eU2A reactions since in the ammonia generation process, the concentration of ammonia is inevitably high on the surface of the electrode, leading to severe corrosion of the electrode and the loss of generated ammonia as well. In this paper, the graphene was derived from raw coal by using the chemical vapor deposition method and self-lifted onto a Ni electrode to form a protective layer for corrosion prevention. Transmission electron microscopy showed the synthesized graphene had few-layers and Raman spectroscopy indicated that the coating of graphene was stable during the eU2A reaction. As a result, the ammonia corrosion of the Ni electrode was dramatically reduced by ~20 times with the graphene coating method. More importantly, a higher ammonia generation rate (~2 times) was achieved using the graphene-coated Ni working electrode compared to a bare Ni electrode in the eU2A process. View Full-Text
Keywords: ammonia corrosion; ammonia generation; urea to ammonia; chemical vapor deposition; graphene coated Ni ammonia corrosion; ammonia generation; urea to ammonia; chemical vapor deposition; graphene coated Ni

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Lu, F.; Botte, G.G. Ammonia Generation via a Graphene-Coated Nickel Catalyst. Coatings 2017, 7, 72.

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