Cathode Performance of Mg-H2O2 Semi-fuel Cell with Pdn-Fe Alloy as Cathode

doi:10.15541/jim20170142

Abstract

Abstract:

Carbon-supported palladium-iron composite electrocatalysts with different Pd to Fe atom ratios (2 : 1, 4 : 1, 8 : 1) were prepared by a chemical reduction method. The morphology and surface state of the Pd_n-Fe/C and Pd/C electrocatalysts were characterized by X-ray diffractionanalysis (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The results indicated that Fe was added to the Pd/C catalyst and reacted with Pd to form Pd_n-Fe alloy, with slightly varied particle size. And the Pd_n-Fe catalyst particles were homogeneously distributed on the surface of the C carrier with the average particle size between 2-3 nm. The addition of Fe influenced crystal lattice structure of Pd/C catalysts. Electrochemical (CV, LSV, CA) data showed that the eletrocatalytic activity of the Pd₄-Fe/C electrocatalyst for hydrogen peroxide electroreduction was much higher than that of Pd/C. The current density of Pd/C electrode for hydrogen peroxide electroreduction reaction was 17.71 mA/cm² when E = 0.2 V and the current density of Pd₄-Fe/C electrode was up to 19.42 mA/cm². The Mg-H₂O₂ semi-fuel cell performance text showed that both the open circuit potential of the two fuel cells were about 1.8 V, of which the power density of Mg-H₂O₂semi-fuel cell using Pd_n-Fe/C as the cathode was higher 41 mW/cm² than that using Pd/C as cathode.

Key words: Fe, Pd/C, Hydrogen peroxide electroreduction, Mg-H2O2 semi-fuel cell

CLC Number:

TQ174

SUN Li-Mei, SHI Le-Le, ZHANG Shuai-Shuai, ZHANG Yi-Jia, LI Zeng-Hui, HE Wurigamula. Cathode Performance of Mg-H₂O₂ Semi-fuel Cell with Pd_n-Fe Alloy as Cathode[J]. Journal of Inorganic Materials, 2018, 33(1): 81-86.

Figures/Tables 7

Fig. 1 XRD patterns of Pd/C and Pdn-Fe/C catalysts

Fig. 2 Different resolution TEM images of Pd/C(a, c) and Pd4-Fe/C(b,d) catalysts

Fig. 3 XPS spectra of Pd4-Fe/C catalyst^(a) Full spectrum; (b) Pd3d; (c) Fe2p

Fig. 4 Cyclic voltammograms of Pd/C and Pdn-Fe/C catalysts in 0.1 mol/L H2SO4 solution

Fig. 5 LSV curves for H2O2 on Pdn-Fe/C and Pd/C catalysts in 0.1 mol/L H2SO4+ 0.5 mol/L H2O2

Fig. 6 Chronoamperometric curves of the Pdn-Fe/C and Pd/C catalysts in 0.5 mol/L H2O2+0.1 mol/L H2SO4 solutions at 0.2 V and 25℃

Fig. 7 Perfomance of Mg-H2O2 semi fuel cells with Pd/C and Pd4-Fe/C as cathodic catalysts^Anodiccatalysts: AZ31Mg alloy, catholyte: 0.4 mol/L H2O2+0.1 mol/L H2SO4+40 g/L NaCl, anolyte: 40 g/L NaCl aqueous solution

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Cathode Performance of Mg-H₂O₂ Semi-fuel Cell with Pd_n-Fe Alloy as Cathode

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