Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (08): 1929-1935.doi: 10.3866/PKU.WHXB201205231

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Layered Double Hydroxide Supported Palladium Nanoparticles for Electrocatalytic Oxidation of Hydrazine

JIN Rong-Rong, LI Li-Fang, XU Xue-Feng, LIAN Ying-Hui, ZHAO Fan   

  1. College of Chemistry and Material Science, Shandong Agricultural University, Taian 271018, Shan-dong Province, P. R. China
  • Received:2012-02-03 Revised:2012-05-21 Published:2012-07-10
  • Contact: LI Li-Fang E-mail:fangll@sdau.edu.cn
  • Supported by:

    The project was supported by the Outstanding Young Scientist Research Award Fund of Shandong Province, China (2008bs07016).

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

MSC2000: 

  • O646