High-Valence Platinum Clusters-Loaded Yttria Nanoparticles as High-Performance Catalysts for Alkaline Hydrogen
Runzi Zhou1, Zhou Chen1, Peng Liao1
1College of Mathematics & Physics, Beijing University of Chemical Technology, Beijing 100029, P.R. China.
None:
Efficient hydrogen production through an electrocatalytic hydrogen evolution reaction (HER) represents an attractive technology for addressing global energy challenges. Toward this end, the development of high-performance HER catalysts represents a critical first step. Herein, high-valence PtClxOy clusters are dispersed on Y2O3 nanoparticle surfaces via an ambient impregnation method at a Pt loading of up to 21.31 wt % using H2PtCl6 as the precursor. Among the series, the PtClxOy/Y2O3-4 sample, with a Pt content of 5.84 wt %, exhibits the best HER activity in alkaline media with a low overpotential of -26 mV at 10 A cm-2. This is ascribed to the synergistic interactions between the Pt clusters and Y2O3 as well as the surrounding O and Cl atoms that impact the energetics of hydrogen adsorption, as revealed by computational studies based on density functional theory calculations. Results from this study underscore the impact of electronic manipulation on the electrocatalytic activity of nanocomposites for electrochemical energy technologies.
Related Concept Videos
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
02:13Reduction of Alkenes: Catalytic Hydrogenation
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
02:50Catalysis