Fabrication of hierarchical Rh nanostructures by understanding the growth kinetics of facet-controlled Rh nanocrystals

Abstract

By understanding the structural relationship among three shape-controlled Rh nanostructures, namely, {111} nanotetrahedrons, {111} tetrahedral nanoframes, and <111> skeletal nanotetrapods, we could prepare novel hierarchical dendritic Rh nanostructures with <111> Rh arms as linkers between tetrahedral shaped nanocrystals.

One‐Pot Synthesis of Highly Anisotropic Five‐Fold‐Twinned PtCu Nanoframes Used as a Bifunctional Electrocatalyst for Oxygen Reduction and Methanol Oxidation

“…To date, various synthetic strategies including sacrificial templates, galvanic replacement, oxidative etching, Kirkendall effect, and electrodeposition have been developed to synthesize noble metal nanoframes. However, the current methods mainly focus on the synthesis of single‐crystalline noble metal nanoframes with cubic, octahedral, truncated octahedral, tetrahedral, and rhombic dodecahedral1, shapes. Until now, it is very rare to synthesize the multiply‐twined noble metal nanoframes …”

Rational Synthesis of Heterostructured M/Pt (M = Ru or Rh) Octahedral Nanoboxes and Octapods and Their Structure-Dependent Electrochemical Activity Toward the Oxygen Evolution Reaction

“…Various methodologies have been developed for the nanocrystal facet control, and utilization of surface‐stabilizing moieties has been the most successful and widely employed method . In the case of heterophase growth, however, heteroepitaxial growth is usually incompatible with the usage of surface‐stabilizing moieties and also likely leads to the conformal coating of the heterophase on the seed nanocrystal, and thus more or less similar morphologies of the final structures to those of seeds have been frequently obtained .…”

Nanoarchitectures for Mesoporous Metals

“…In solution‐phase synthesis, nanocrystals of face‐centered‐cubic (fcc) metals usually tend to take on a polyhedral shape, such as truncated octahedra, cubes, octahedra, icosahedra, or decahedra, because of their lower surface energy, thereby making the nanoparticles thermodynamically more stable . Currently, however, the rational synthesis by solution‐phase methods of dendritic metal particles with superior properties has been developed to the point where it is now possible to form nanoporous particles for a wide spectrum of metals, such as Pt, Pd, Au, Ag, and Rh . The synthesis of dendritic metals can be carried out through different growth mechanisms, such as kinetically controlled overgrowth, aggregation‐based growth ( Figure a), selective oxidative etching, and template‐mediated methods .…”