Fig. 5
From: The role of promoters on NiO catalysts for methane decomposition and hydrogen production
(A) Survey XP spectra, High-resolution (B) Ni 2p spectra and (C) O 1s spectra for (a) pure NiO, (b) 10% Al-NiO, (c) 10% Co-NiO and (d) 10% Cu-NiO materials.
