title: Carbon monoxide-assisted synthesis of single-crystalline Pd tetrapod nanocrystals through hydride formation.
abstract: Carbon monoxide can adsorb specifically on Pd(111) to induce the formation of unique Pd nanostructures. In the copresence of CO and H(2), single-crystalline Pd tetrapod nanocrystals have now been successfully prepared. The Pd tetrapods are enclosed by (111) surfaces and are yielded through hydride formation. Density functional theory calculations revealed that the formation of PdH(x) in the presence of H(2) reduces the binding energy of CO on Pd and thus helps to decrease the CO coverage during the synthesis, which is essential to the formation of the PdH(x) tetrapod nanocrystals. In addition to tetrapod nanocrystals, tetrahedral nanocrystals were also produced in the copresence of CO and H(2) when the reaction temperature was ramped to further lower the CO coverage. Upon aging in air, the as-prepared PdH(x) nanocrystals exhibited a shape-dependent hydrogen releasing behavior. The conversion rate of PdH(x) tetrapod nanocrystals into metallic Pd was faster than that of tetrahedral nanocrystals.
authors.affiliation: State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Dai
authors.forename: Xiaoliang
authors.initials: X
authors.lastname: Mu
authors.forename: Yueming
authors.initials: Y
authors.lastname: Tan
authors.forename: Kaiqiang
authors.initials: K
authors.lastname: Lin
authors.forename: Zhilin
authors.initials: Z
authors.lastname: Yang
authors.forename: Nanfeng
authors.initials: N
authors.lastname: Zheng
authors.forename: Gang
authors.initials: G
authors.lastname: Fu