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.
Originalspråk | engelska |
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Tidskrift | Journal of Colloid and Interface Science |
Volym | 556 |
Sidor (från-till) | 180-192 |
Antal sidor | 13 |
ISSN | 0021-9797 |
DOI | |
Status | Publicerad - 15 nov. 2019 |
MoE-publikationstyp | A1 Tidskriftsartikel-refererad |
Vetenskapsgrenar
- 114 Fysik
- 116 Kemi
Utrustning
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Center for X-ray Spectroscopy
Simo Huotari (Chef) & René Bes (Chef)
Avdelningen för fysikUtrustning/facilitet: Forskningslaboratorium
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X-ray Laboratory
Simo Huotari (Chef)
Avdelningen för fysikUtrustning/facilitet: Forskningslaboratorium