Hydrogen Spillover on CeO₂/Pt: Enhanced Storage of Active Hydrogen

We have investigated the concept of hydrogen spillover by a density functional theory (DFT) approach in combination with experimental observations. A H/Pt molar ratio of 5 to 9 is observed over Ce 1− x Pt x O 2−δ catalyst, where Pt is present in the +2 ionic state. The total hydrogen adsorbed over the catalyst is ∼30 times higher than that over nano-Pt metal particles. NMR study show protonic hydrogen over the catalyst. DFT calculations indeed support the enhanced adsorption of hydrogen on the Pt-ion-doped ceria surface via spillover to the oxide support. Further, the calculations confirm the formation of protonic hydrogen on the catalyst surface in contrast to the formation of hydridic hydrogen on Pt metal.