title: Enhanced Selectivity to H2 Formation in Decomposition of HCOOH on the Ag19@Pd60 Core-Shell Nanocluster from First-Principles.
abstract: In this study, using spin-polarized density functional theory calculation we examined the origin of enhanced catalytic activity toward H2 production from HCOOH in Ag19@Pd60 core-shell nanoclusters (a 79-atom truncated octahedral cluster models). First, we find that the Pd monolayer shell on the Ag core can greatly enhance the selectivity to H2 formation via HCOOH decomposition compared to the pure Pd79 cluster by substantially reducing the binding energy of key intermediate HCOO and in turn the barrier for dehydrogenation. This activity enhancement is related to the modification of d states in the Pd monolayer shell by the strong ligand effect between Ag core and Pd shell, rather than the tensile strain effect by Ag core. In particular, the absence of dz2-r2 density of states near the Fermi level in the Pd monolayer shell (which originated from the substantial charge transfer from Ag to Pd) is the main reason for the increased H2 production from HCOOH decomposition.
authors.forename: Jinwon
authors.initials: J
authors.lastname: Cho
authors.forename: Sangheon
authors.initials: S
authors.lastname: Lee
authors.forename: Jonghee
authors.initials: J
authors.lastname: Han
authors.forename: Sung Pil
authors.initials: SP
authors.lastname: Yoon
authors.forename: Suk Woo
authors.initials: SW
authors.lastname: Nam
authors.forename: Sun Hee
authors.initials: SH
authors.lastname: Choi
authors.forename: Seong-Ahn
authors.initials: SA
authors.lastname: Hong
authors.forename: Kwan-Young
authors.initials: KY
authors.lastname: Lee
authors.forename: Hyung Chul
authors.initials: HC
authors.lastname: Ham