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Title:Highly active iron phosphide catalysts for selective electrochemical nitrate reduction to ammonia
Authors:ID Chouki, Takwa (Author)
ID Machreki, Manel (Author)
ID Rutkowska, Iwona A. (Author)
ID Rytelewska, Beata (Author)
ID Kulesza, Pawel Jozef (Author)
ID Tyuliev, Georgi (Author)
ID Harb, Moussab (Author)
ID Azofra, Luis Miguel (Author)
ID Emin, Saim (Author)
Files:.pdf RAZ_Chouki_Takwa_i2023.pdf (7,95 MB)
MD5: 619C2A026ADD32419D380440031BA0D4
Work type:Unknown
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:The electrochemical reduction reaction of the nitrate ion (NO3−), a widespread water pollutant, to valuable ammonia (NH3) is a promising approach for environmental remediation and green energy conservation. The development of high-performance electrocatalysts to selectively reduce NO3− wastes into value-added NH3 will open up a different route of NO3− treatment, and impose both environmental and economic impacts on sustainable NH3 synthesis. Transition metal phosphides represent one of the most promising earth-abundant catalysts with impressive electrocatalytic activities. Herein, we report for the first time the electrocatalytic reduction of NO3− using different phases of iron phosphide. Particularly, FeP and Fe2P phases were successfully demonstrated as efficient catalysts for NH3 generation. Detection of the in-situ formed product was achieved using electrooxidation of NH3 to nitrogen (N2) on a Pt electrode. The Fe2P catalyst exhibits the highest Faradaic efficiency (96 %) for NH3 generation with a yield (0.25 mmol h−1 cm-−2 or 2.10 mg h−1 cm−2) at − 0.55 V vs. reversible hydrogen electrode (RHE). The recycling tests confirmed that Fe2P and FeP catalysts exhibit excellent stability during the NO3− reduction at − 0.37 V vs. RHE. To get relevant information about the reaction mechanisms and the fundamental origins behind the better performance of Fe2P, density functional theory (DFT) calculations were performed. These results indicate that the Fe2P phase exhibits excellent performance to be deployed as an efficient noble metal-free catalyst for NH3 generation.
Keywords:iron phosphide, electrocatalysts, nitrates reduction ammonia, DFT calculations
Publication status:Published
Publication version:Version of Record
Publication date:01.04.2023
Year of publishing:2023
Number of pages:str. 1-11
Numbering:Vol. 11, no. 2, [article no.] 109275
PID:20.500.12556/RUNG-7905-535deab0-b5c9-2751-fbbe-5114adef8f7c New window
COBISS.SI-ID:140447235 New window
ISSN on article:2213-3437
DOI:10.1016/j.jece.2023.109275 New window
Publication date in RUNG:02.02.2023
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Record is a part of a journal

Title:Journal of environmental chemical engineering
Publisher:Elsevier B.V.
COBISS.SI-ID:519695385 New window

Document is financed by a project

Funder:ARRS - Slovenian Research Agency
Project number:N2-0221
Name:Večnamenski elektrokatalizatorji za čisto energijsko pretvorbo


License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:02.02.2023