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Chinese Journal of Materials Research  2014, Vol. 28 Issue (6): 413-419    DOI: 10.11901/1005.3093.2013.869
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Synthesis of Nano-Pd Particles in a Quaternary System with a Hexagonal Liquid Crystal as Template and Their Electrocatalytic Activity for Oxidation of Ethanol
Yanli WANG1,**(),Dexin TAN2,Sen CHEN1,Ling BIAN1
1. Institute of Materials Science and Engineering, Anhui University of Science and
Technology, Huainan 232001
2. Institute of Chemical Engineering, Anhui University of Science and Technology, Huainan 232001
Cite this article: 

Yanli WANG,Dexin TAN,Sen CHEN,Ling BIAN. Synthesis of Nano-Pd Particles in a Quaternary System with a Hexagonal Liquid Crystal as Template and Their Electrocatalytic Activity for Oxidation of Ethanol. Chinese Journal of Materials Research, 2014, 28(6): 413-419.

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Abstract  

Nano-Pd catalyst have been synthesized by slow reduction of Pd2+ in a quaternary system of brine-cyclohexane-surfactant-cosurfactant with a hexagonal lyotropic liquid crystal as template in a dark place under soft condition. Then the synthesized Pd nano-particles were characterized by optical microscopy、XRD、TEM、and HRTEM with selected area electron diffraction (SAED). The electrocatalytic properties of the nano-Pd modified glassy carbon electrode (Pd/GCE) for ethanol oxidation had been also investigated by cyclic voltammetry. The results show that the synthesized nano-Pd particles after reaction for 24 h show more or less the same shape with regular morphology with a mean size of (31±1) nm. This material exhibits the excellent electrocatalytic activity and anti-poisoning ability for the ethanol oxidation.

Key words:  metallic materials      hexagonal mesophases      palladium      ethanol      electrocatalysis     
Received:  19 November 2013     
Fund: *Supported by the National Natural Science Foundation of China No. 51303005, the Educational Commission of Anhui Province of China No. KJ2013A087 & KJ2013A095, and the Doctor Foundation of the Anhui University of Science and Technology.

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https://www.cjmr.org/EN/10.11901/1005.3093.2013.869     OR     https://www.cjmr.org/EN/Y2014/V28/I6/413

Fig.1  The phase diagrams (weight percent) of SDS/water (brine)//n-C5H11OH/cyclohexane
Fig.2  Optical microscopy pictures of lyotropic liquid crystal texture of (a) A1, (b) A2, (c) A3, (d) A4 and (e) A5 in Fig.1
Fig.3  Low-angel XRD spectra of sample. (a) A3 and (b) A3 with PdCl2
Fig.4  XRD spectra for nano-Pd
Fig.5  TEM images of nano-Pd: (a) TEM image and the corresponding SAED pattern; (b) high-magnification TEM image; (c) HRTEM image of nano-Pd
Fig.6  TEM images of nano-Pd. (a) 8 h; (b) 12 h; (c) 18 h; (d) 24 h
Fig.7  Cyclic voltammograms (CV) of ethanol at different electrodes
Electrode Eonset/V jp/mAcm-2 jf/jb
PdI/GCE -0.50 0.13 1.5
PdII/GCE -0.53 0.15 1.85
PdIII/GCE -0.57 0.48 6.25
PdIV/GCE -0.66 1.55 15.6
Table 1  Data analysis of cyclic voltammetric curves for different electrodes
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