title: Controlled formation of concave tetrahedral/trigonal bipyramidal palladium nanocrystals.
abstract: Novel concave Pd nanocrystals with uniform diameter were successfully prepared in the presence of formaldehyde. While the outer surfaces of the as-prepared concave Pd nanocrystals are {111}, the faces concave toward the polyhedral center are high-surface-energy {110} faces. The degree of concavity and therefore the percentage of {110} of the nanocrystals are tunable by varying the amount of formaldehyde and the reaction temperature. Owing to the existence of active {110} facets, the electrocatalytic activity of the concave Pd nanocrystals displays dependency on their degree of concavity.
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: Xiaoqing
authors.initials: X
authors.lastname: Huang
authors.forename: Shaoheng
authors.initials: S
authors.lastname: Tang
authors.forename: Huihui
authors.initials: H
authors.lastname: Zhang
authors.forename: Zhiyou
authors.initials: Z
authors.lastname: Zhou
authors.forename: Nanfeng
authors.initials: N
authors.lastname: Zheng