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Site-Specific Heteroatoms Doped Graphdiyne as Metal-Free Electrocatalysts for Nitrogen Reduction

Projektbeschreibung

Hochleistungskatalysatoren für Stickstoffreduktionsreaktionen

Die elektrokatalytische Stickstoffreduktionsreaktion stellt eine nachhaltige Alternative für die Ammoniakherstellung dar. Ihrem breiten Einsatz steht jedoch der geringe Wirkungsgrad von metallbasierten Elektrokatalysatoren im Wege. N- und BC3-Strukturen (eine grafitähnliche Verbindung) haben sich als die aktivsten Stellen der Ammoniaksynthese erwiesen, jedoch stehen gegenwärtig keine effizienten Verfahren für eine ortsspezifische Dotierung zur Verfügung. Das im Rahmen der Marie-Skłodowska-Curie-Maßnahmen finanzierte Projekt GDYNRR plant die selektive Dotierung von Graphdiyn (GDY), einem lamellaren Kohlenstoffallotrop, mit N- und BC3-Atomen, um hochselektive Katalysatoren für die elektrokatalytische Stickstoffreduktionsreaktion zu erzielen. Schwerpunkt wird die Untersuchung der Auswirkungen der N- und BC3-Strukturen auf die Eigenschaften von Graphdiyn sein.

Ziel

Eletrocatalytic nitrogen reduction reaction (NRR) has rencetly emerged as a sustainable alternative for ammonia production. However, the metal-based electrocatalysts for NRR suffer from low efficienciess due to the competing hydrogen evolution reaction. Heteroatoms doped carbon based metal-free catalysts feature weak integration with hydrogen, making them potential candidates for NRR. The NRR activity depends closely on the the form of doped atoms. The pyridinic N atoms and BC3 structure are demonstrated as the most active sites for ammonia synthesis. However, for widely researched carbon materials, it is difficult to selectively dope a sufficient amount of site-specific pyridinic N or BC3 atoms.
As a lamellar carbon allotrope, graphdiyne (GDY), constituted by sp- and sp2- carbon atoms, is a great breakthrough. The high energy of sp-hybridization of acetylenic linkages enables the arbitrary angle rotation of π/π* perpendicular to the axis, endowing it a possibility to point towards N2. Another important feature of GDY is that it can be synthesized in solution via bottom-up method. A controllable heteroatoms doping method using a monomer design strategy, provides an ideal solution to achieve the site-specific doping. However, the attempt to design site-specific pyridinic N or BC3 atoms doped GDYs for electrocatalytic NRR has never been reported.
The objective of this project is to selectively dope the site-specific pyridinic N and BC3 atoms into GDY to achieve the high performance and selectivity towards NRR. The influence of the pyridinic N and BC3 structure on the properties of GDY will be studied. Afterwards, the prepared site-specific heteroatoms doped GDYs will be used as electrocatalysts for NRR. Owing to the exact doping structure, the catalytic mechanisms for NRR will be recognized. At last, the optimal heteroatoms doped GDY electrode will be integrated in a functional N2 reduction device to demonstrate the overall N2 reduction in practical conditions.

Koordinator

ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE
Netto-EU-Beitrag
€ 191 149,44
Adresse
BATIMENT CE 3316 STATION 1
1015 Lausanne
Schweiz

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Region
Schweiz/Suisse/Svizzera Région lémanique Vaud
Aktivitätstyp
Higher or Secondary Education Establishments
Links
Gesamtkosten
€ 191 149,44