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Electrical conduction of palladium-decorated multi-layered graphene oxide effected by hydrogen dissociation

S. J. Baek ; W. G. Hong ; M. Park ; Tord Claeson (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; H. J. Kim ; B. H. Kim ; Y. W. Park
Synthetic Metals (0379-6779). Vol. 199 (2015), p. 74-78.
[Artikel, refereegranskad vetenskaplig]

Multi-layered graphene oxide (MGO) and palladium-decorated MGO (PdGO) are electrically evaluated as a function of H-2 pressure up to 20 bar to elucidate an interaction between molecular hydrogen and PdGO. As H-2 pressure increases, the electrical conductance (G) of MGO also increases while that of PdGO decreases. Using atomic force microscopy, X-ray photoelectron spectroscopy, and Fourier transform-infrared spectroscopy analysis, we found that MGO reduction due to H-2 accounts for the increase in G of the MGO. For PdGO, an increase of OH groups was observed, which shows that PdGO was oxidized when exposed to high H-2 pressure. The PdGO oxidation can be explained by a hydrogen spillover effect and the decrease of G may be due to this behavior.

Nyckelord: Multi-layered graphene oxide, Pd decoration, Hydrogen dissociation, Electrical conductance



Denna post skapades 2015-03-12.
CPL Pubid: 213728

 

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