CO₂ adsorption on pure and oxidised Ni nano-structures deposited on mica surfaces

ABSTRACT

Adsorption and desorption of CO${}_2$ on metallic and oxidised Ni nano-structures supported on mica (muscovite) substrates have been studied by temperature-programmed desorption (TPD), X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). Predominantly physisorption was observed at low temperatures near 130 K. Weak desorption features were found at temperatures up to about room temperature for both metallic and oxidised samples. No clear indication of dissociation of CO${}_2$ was found on neither the oxidised nor the metallic sample. More CO${}_2$ was observed to adsorb on oxidised Ni nano-structures as compared to the metallic structures. A large affinity to adsorption of CO from the ambient vacuum was seen on the nano-structures. An absence of strong dependence on Ni amount on CO${}_2$ adsorption is reported.

KEYWORDS:

• Adsorption
• atomic force microscopy
• nanoparticles
• nickel
• oxides
• photoelectron spectroscopy

Acknowledgments

This work was supported by the Research Council of Norway (RCN) under project no. NFR 250728.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the Research Council of Norway (RCN) under project no. NFR 250728.