水滑石负载的钯纳米粒子对水合肼的电催化氧化

doi:10.3866/PKU.WHXB201205231

Abstract

Abstract:

A Mg-Al layered double hydroxide (LDH) was prepared from Mg(NO₃)₂·6H₂O and Al((NO₃)₃· 9H₂O by a constant-pH co-precipitation method at room temperature. PdCl2₄^- was successfully introduced into the gallery space of the Mg-Al-LDH via an ion exchange process, and then reduced by hydrazine to produce LDH-supported palladium (LDH-Pd⁰) nanomaterials. The sample was characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), and X-ray photoelectron spectroscopy (XPS). It was found that palladium nanoparticles were well dispersed on the LDH surface. The LDH-Pd⁰ nanomaterial was immobilized on a glassy carbon electrode (GCE) to oxidize hydrazine in a phosphate buffer solution (PBS, pH 7.0) using cyclic voltammetry (CV). The modified electrode exhibited excellent electrocatalytic activity and thus could be used to determine the concentration of hydrazine. This was verified by examining the amperometric response at a working potential of -0.1 V, where it was found that the anodic peak current of the modified electrodes was linear with hydrazine concentration in the range of 1.0×10^-5-2.0×10^-4 mol·L^-1. The detection limit was 9.5×10^-7 mol·L^-1 at a signal-to-noise ratio of 3. The electrochemically effective surface areas were determined by chrono-coulometry (CC) to be 0.02089, 0.02762, and 0.02496 cm² for GCE, LDH-Pd⁰/GCE, and LDH/GCE, respectively. The irreversible oxidation of hydrazine on the modified electrode is diffusion controlled with the participation of four electrons and four protons.

Key words: Layered double hydroxide, Palladium nanoparticle, Cyclic voltammetry, Hydrazine, Modified electrode, Electrocatalysis

JIN Rong-Rong, LI Li-Fang, XU Xue-Feng, LIAN Ying-Hui, ZHAO Fan. Layered Double Hydroxide Supported Palladium Nanoparticles for Electrocatalytic Oxidation of Hydrazine[J]. Acta Phys. -Chim. Sin. 2012, 28(08), 1929-1935. doi: 10.3866/PKU.WHXB201205231

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Layered Double Hydroxide Supported Palladium Nanoparticles for Electrocatalytic Oxidation of Hydrazine

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