Effects of Mo Doping on Properties of Pt/C as Catalyst towards Electro-oxidation of Ethanol

doi:10.15541/jim20130663

Abstract

Abstract:

Direct Ethanol Fuel Cells (DEFCs) have attracted lots of interest with the merits of high energy density and environmental benignity. Thus, development of novel efficient catalyst with high activity and excellent durability is of great importance for the future large-scale application of DEFCs. A series of Mo-doped Pt/C catalysts were synthesized with microwave assisted technology, and the effects of Mo content on the activity as well as durability of the resulted catalyst towards ethanol oxidation were comparatively investigated by using cyclic voltammetry, electrochemical impedance spectroscopy and chronoamperometry. The result shows that the Pt₂Mo/C catalyst demonstrates a comparable onset potential to Pt/C, the highest current density and the slowest deterioration towards ethanol oxidation, implying that the Pt₂Mo/C catalyst is best one to achieve highest activity and best durability.

Key words: Mo doped Pt/C catalyst, microwave-assisted synthesis, ethanol oxidation

CLC Number:

TM911

LI Lin, YUAN Xian-Xia, XIA Xiao-Yun, DU Juan, MA Zhong, MA Zi-Feng. Effects of Mo Doping on Properties of Pt/C as Catalyst towards Electro-oxidation of Ethanol[J]. Journal of Inorganic Materials, 2014, 29(10): 1044-1048.

Figures/Tables 7

Fig. 1 TEM images of Pt/C catalysts doped with various ratios of Mo (a) PtMo/C; (b) Pt2Mo/C; (c) Pt3Mo/C; (d) Pt4Mo/C

Fig. 2 CV curves of Pt/C catalysts doped with various ratios of Mo in 0.5 mol/L H2SO4+0.5 mol/L C2H5OH solution

Fig. 3 Electrochemical impedance spectra of Pt/C catalysts doped with various ratios of Mo in 0.5 mol/L H2SO4+0.5 mol/L C2H5OH solution

Fig. 4 Chronoamperometry of Pt/C catalysts doped with various ratios of Mo in 0.5 mol/L H2SO4+0.5 mol/L C2H5OH solution

Fig. 5 CV curves (150 cycles) of Pt/C catalysts in 0.5 mol/L H2SO4 + 0.5 mol/L C2H5OH solution

Table 1 Peak current density and decrement of Pt/C catalysts doped with various ratios of Mo during 150 cycles of CV in 0.5 mol/L H2SO4+0.5 mol/L C2H5OH solution

Catalysts	1st cycle /(mA·cm^-2)	150th cycle /(mA·cm^-2)	Decrement /%
Pt/C	39.57	17.53	55.7
PtMo/C	29.55	20.83	29.5
Pt₂Mo/C	48.15	41.13	14.6
Pt₃Mo/C	26.77	16.65	37.8
Pt₄Mo/C	26.62	15.99	39.9

Fig. 6 CV curves (150 cycles) of Pt/C catalysts doped with various ratios of Mo in 0.5 mol/L H2SO4 + 0.5 mol/L C2H5OH solution

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