Bimetallic AuRh nanodendrites consisting of Au icosahedron cores and atomically ultrathin Rh nanoplate shells: synthesis and light-enhanced catalytic activity

Abstract

Precise control of the morphology, composition and structure of metal nanostructures not only effectively improves their catalytic activity and durability but also enhances their range of applications. In this work, bimetallic Au@Rh core-shell nanodendrites are synthesized by a facile one-pot hydrothermal method. Physical characterizations show that the dendritic Rh consists of two-dimensional (2D) ultrathin Rh nanoplates with a thickness of approximately 1.2 nm. For the first time, Au@Rh core-shell nanostructures are used as a catalyst for the hydrogen generation reaction from aqueous hydrazine solution (N 2 H 4 = N 2 +2H 2 , HGR-N 2 H 4 ). Bimetallic Au@Rh core-shell nanodendrites exhibit improved catalytic activity and durability for the HGR-N 2 H 4 compared with commercial Rh nanocrystals, which can be attributed to the atomically ultrathin structure of 2D Rh nanoplates and the interconnected structure of nanodendrites, respectively. Under light irradiation, bimetallic Au@Rh core-shell nanodendrites show light-enhanced catalytic activity for the HGR-N 2 H 4 , originating from the distinctive localized surface plasmon resonance of Au icosahedron cores.

Kinetics of Spontaneous Bimetallization between Silver and Noble Metal Nanoparticles

“…Bimetallic nanoparticles (NPs) attract significant attention because they usually exhibit more interesting catalytic, [1][2][3] photocatalytic, [4] electrocatalytic, [5,6] and optical properties [7,8] than do their corresponding monometallic NPs. We previously reported that the simple physical mixture of different NP sols spontaneously leads to the formation of core/shell structured bimetallic NPs (Scheme 1) [9][10][11][12] or an ano-alloy, [13] and am ixture of palladium NPs and gold ions forms crown-jewel typeb imetallic NPs.…”

Kinetically Controlled Synthesis of Rhodium Nanocrystals with Different Shapes and a Comparison Study of Their Thermal and Catalytic Properties

“…In particular, the Rh octahedra enclosed by {111} facets exhibited 3.9- and 1.7-fold enhancements in terms of H 2 selectivity relative to their cubic and cuboctahedral counterparts, respectively. The enhanced selectivity of Rh octahedra could be rationalized by the lower activation energy for the dehydrogenation of hydrazine molecules on Rh{111} facets relative to that on Rh{100} facets. − Additionally, the decreased transient Rh–H bond strength and adsorption affinity of intermediates on Rh{111} facets were also found to be advantageous in promoting H 2 generation from hydrazine decomposition. − …”

Selective Etching Induced Synthesis of Hollow Rh Nanospheres Electrocatalyst for Alcohol Oxidation Reactions

“…Preparation of Au@Rh NSs : Au@Rh NSs were synthesized according to our previous work with slight modification . Aqueous solutions of RhCl 3 ⋅ n H 2 O (0.01 m , 6 mL), PEI (0.05 m , 1.2 mL), HAuCl 4 ⋅3H 2 O (0.01 m , 3 mL) were added in of DEG into deionized water (22.8 mL) containing DEG (4 mL).…”