Ru Nanoframes with an fcc Structure and Enhanced Catalytic Properties

Abstract

Noble-metal nanoframes are of great interest to many applications due to their unique open structures. Among various noble metals, Ru has never been made into nanoframes. In this study, we report for the first time an effective method based on seeded growth and chemical etching for the facile synthesis of Ru nanoframes with high purity. The essence of this approach is to induce the preferential growth of Ru on the corners and edges of Pd truncated octahedra as the seeds by kinetic control. The resultant Pd-Ru core-frame octahedra could be easily converted to Ru octahedral nanoframes of ∼2 nm in thickness by selectively removing the Pd cores through chemical etching. Most importantly, in this approach the face-centered cubic (fcc) crystal structure of Pd seeds was faithfully replicated by Ru that usually takes an hcp structure. The fcc Ru nanoframes showed higher catalytic activities toward the reduction of p-nitrophenol by NaBH4 and the dehydrogenation of ammonia borane compared with hcp Ru nanowires with roughly the same thickness.

Controlled one-pot synthesis of RuCu nanocages and Cu@Ru nanocrystals for the regioselective hydrogenation of quinoline

“…1(e)). The clear lattice fringes with interplanar distances of approximately 0.23 and 0.20 nm can be assigned to the (100) and (101) facets of hexagonal close-packed (hcp) Ru-Cu alloy, respectively [16].…”

Cactus‐Like Hollow Cu2‐xS@Ru Nanoplates as Excellent and Robust Electrocatalysts for the Alkaline Hydrogen Evolution Reaction

“…Herein, a facile synthesis of cactus‐like Ru‐rich islands on hollow Cu 2‐ x S nanoplates (NPs) as well as their excellent catalytic activities for the HER in alkaline media is reported. The synthesis of cactus‐like hollow Cu 2‐ x S@Ru NPs is based on an initial cationic exchange on preformed Cu 1.94 S NPs, followed by the heteroepitaxial growth of Ru atoms (for a TEM image of the Cu 1.94 S nanotemplate, see Figure S1 in the Supporting Information) . Ru‐rich islands on the copper sulfide NPs form during the initial stage through Ru cation exchange, with copper ions from the Cu 1.94 S template and subsequent thermal decomposition of the Ru precursor.…”

Recent progress in the structure control of Pd–Ru bimetallic nanomaterials

“…[71] The fcc Ru nanoframe was evolved from Pd@Ru core-shell structure with a 2-nm shell thickness. Similar with the abovementioned methods, a two-step seeded growth process was applied.…”