Studies Of Electrochemical Performance Of The Supported Noble Metal Nanoparticles Catalysts Based On Layered Double Hydroxide

Noble metal nanomaterials with high catalytic efficiency, high selectivity have attracted much attention. However the noble metal is easily aggregated, which results in the poor dispersion, poor storage, poor catalytic efficiency and even deactivation. These inhibited the development of the noble metal catalyst. So the development of carrier supported noble metals catalyst has extensively studied. Layered double hydroxide (LDHs) with adjustable shelves composition, adjustable shelves interlayer anions and other characteristics have been widely used in the catalysis. Considering the adjustable composition of the LDHs, we designed layered double hydroxide with different metal compositions to support noble metal. Besides we investigated the role what the compositions of carrier LDHs played on the size of nobel metal nanoparticles(NPs) and catalytic properties. The main contents of this paper are as follows:1. A series of LDHs with different metal elements were prepared by the method of separate nucleation and aging steps (SNAS). And the double metal cations in the brucite-like layers are in atomic-scale distribution. SEM characterization showed that the carrier Mn-LDHs has great effect on the size of AuNPs. The stability and electrocatalytic properties of the four catalysts were investigated by cyclic voltammetry. The result showed that CoMn-LDHs is a promising carrier materials.2. We explored the influence of divalent metallic element on supported platinum (Pt) NPs. And we found that the compositions of carrier have great influence on the size of PtNPs. Electrochemical sensors based on PtNPs/MgAl-LDHs was fabricated to detect glucose and the detection limit is0.45μmol·L-1(S/N=3).