Preparation and Electrocatalytic Properties of Pd/PMo12-GN Composite towards Formic Acid Oxidation

doi:10.3724/SP.J.1077.2014.13541

Abstract

Abstract:

The Pd/PMo₁₂-GN composite film was prepared by electrochemical reduction, in which GN prepared from GO reduction under UV irradiation and simultaneously functional embellished by PMo₁₂. The as-prepared composite was characterized by X-ray diffraction, X-ray photoelectron spectroscope, scanning electron microscope and transmission electron microscope. It was shown that Pd/PMo₁₂-GN composite was successfully prepared and Pd particles were uniformly-dispersed with a small particle size on the PMo₁₂-GN substrate. Cyclic voltammetry, chronoamperometric curves, CO-stripping curves and EIS were used to discuss the electrocatalytic activities of the Pd/PMo₁₂-GN composite film. The results indicated that the as-prepared composite film presented better electrocatalytic activity, stability, CO tolerance ability, and electric conductivity towards formic acid oxidation as compared with commercial Pd/C catalyst. The enhancement in electrochemical performance of the Pd/PMo₁₂-GN composite film can be attributed to the synergistic effect of highly dispersed Pd nanoparticles on the PMo₁₂-GN substrate and higher oxidation power of PMo₁₂ which promotes the removal of the poisonous species on the Pd surface.

Key words: graphene, polyoxometalates, formic acid, catalytic oxidation

CLC Number:

O646

HUANG Xiao-Ling, LIN Zhou, LIAN Xing-Yi, ZHANG Xiao-Feng, LIN Shen. Preparation and Electrocatalytic Properties of Pd/PMo₁₂-GN Composite towards Formic Acid Oxidation[J]. Journal of Inorganic Materials, 2014, 29(7): 722-728.

Figures/Tables 10

Fig. 1 XRD patterns of Pd/PMo12-GN (a) and Pd/C (b)

Fig. 2 XPS spectra of Pd/PMo12-GN (a) Full-spectra; (b) Pd3d spectra

Fig. 3 C1s XPS spectra of Pd/PMo12-GN (a) and GO (b)

Fig. 4 Different magnification SEM images of Pd/PMo12-GN

Fig. 5 TEM (a) and HRTEM (b) images of Pd/PMo12-GN

Fig. 6 Cyclic voltammograms of Pd/PMo12-GN/GCE (a) and Pd/C/GCE (b) in 0.5 mol/L H2SO4 solution

Fig.7 Cyclic voltammograms of Pd/PMo12-GN/GCE (a) and Pd/C/GCE (b) in 0.5 mol/L H2SO4+1.0 mol/L HCOOH solution

Fig.8 I-t curves of Pd/PMo12-GN/GCE (a) and Pd/C/GCE (b) in 0.5 mol/L H2SO4+1.0 mol/L HCOOH solution

Fig.9 CO-stripping curves of Pd/PMo12-GN/GCE (a) and Pd/ C/GCE (b) in 0.5 mol/L H2SO4 solution

Fig.10 Nyquist plots of EIS of Pd/PMo12-GN/GCE (a) and Pd/C/GCE (b) in 0.5 mol/L H2SO4+1.0 mol/L HCOOH solution

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Preparation and Electrocatalytic Properties of Pd/PMo₁₂-GN Composite towards Formic Acid Oxidation

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