Comprehensive study to design advanced metal-carbide@garaphene and metal-carbide@iron oxide nanoparticles with tunable structure by the laser ablation in liquid

Fatemeh Davodi, Elisabeth Mühlhausen, Daniel Settipani, Eeva-Leena Rautama, Ari-Pekka Honkanen, Simo Huotari, Galina Marzun, Pekka Taskinen, Tanja Kallio

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

Sammanfattning

Core-shell nanoparticles represent a class of materials that exhibit a variety of properties. By rationally tuning the cores and the shells in such nanoparticles (NPs), a range of materials with tailorable properties can be produced which are of interest for a wide variety of applications. Herein, experimental and theoretical approaches have been combined to show the structural transformation of NPs resulting to the formation of either NiFexCy encapsulated in ultra-thin graphene layer (NiFe@UTG) or Ni3C/FexCy@FeOx NPs with the universal one-step pulse laser ablation in liquid (PLAL) method. Analysis suggests that carbon in Ni3C is the source for the carbon shell formation, whereas the final carbon-shell thickness in the NPs originates from the difference between Ni3C and FexCy phases stability at room temperature. The ternary Ni-Fe-C phase diagram calculations reveal the competition between carbon solubility in the studied metals (Ni and Fe) and their tendency toward oxidation as the key properties to produce controlled core-shell NP materials. As an application example, the electrocatalytic hydrogen evolution current on the different NPs is measured. The electrochemical analysis of the NPs reveals that NiFe@UTG has the best performance amongst the NPs in this study in both alkaline and acidic media.
Originalspråkengelska
TidskriftJournal of Colloid and Interface Science
Volym556
Sidor (från-till)180-192
Antal sidor13
ISSN0021-9797
DOI
StatusPublicerad - 15 nov 2019
MoE-publikationstypA1 Tidskriftsartikel-refererad

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