Effect of Particle Size on the Electrocatalytic Activity of Pt/C Catalysts for Oxidation of Formic Acid†

doi:10.7503/cjcu20140156

Abstract

Abstract:

In methanol solvent, using SnCl₂ as reducing agent, carbon supported Pt(Pt/C) catalysts with different size of Pt particles were prepared. X-ray diffraction(XRD) and transmission electron microscopy(TEM) measurements demonstrated that in the obtained Pt/C catalysts, the Pt particles have great uniformity and good dispersion. The electrochemical experiments indicated that the effect of average particle size of Pt/C catalysts for formic acid oxidation is obvious. The Pt/C catalyst with 3.2 nm average size of the Pt particles exhibited the optimal electrocatalytic performance for formic acid oxidation. This effect of particle size may be related to the quantity of the oxygen-containing species on the surface of the catalyst, the apparent surface area and the relative crystallinity of the platinum particles.

Key words: Platinum catalyst, Formic acid oxidation, Effect of particle size, Electrocatalysis

CLC Number:

O646

TrendMD:

WANG Yanen, CAO Shuang, WU Weihong, WU Min, TANG Yawen, LU Tianhong. Effect of Particle Size on the Electrocatalytic Activity of Pt/C Catalysts for Oxidation of Formic Acid^†[J]. Chem. J. Chinese Universities, 2014, 35(11): 2455.

Figures/Tables 7

Fig.1 XRD patterns of Pt/C catalysts with different Pt particle sizes Pt particle size/nm: a. 2.2; b. 3.2; c. 3.8; d. 4.3; e. 4.8.

Table 1 Structure parameters of different Pt/C catalysts

Heating temperature/℃	d/nm(XRD)	S/(m²·g^-1)	Relative crystallinity	Surface average dispersion, D(%)
65	2.2	127.4	0.61	40.7
60	3.2	87.6	1.56	34.5
50	3.8	73.8	2.32	30.9
40	4.3	65.2	2.86	28.3
30	4.8	58.4	3.30	26.0

Fig.2 TEM image of the Pt/C catalysts with the average sizes of Pt particles 3.2 nm(A) and the histogram of the Pt particle size distribution(B)

Fig.3 CO-stripping voltammograms of different Pt/C catalysts in 0.5 mol/L HClO4 Scan rate: 20 mV/s

Fig.4 Linear scan voltammograms of Pt/C catalysts with different Pt particles sizes in 0.5 mol/L H2SO4 + HCOOH solution Pt particle size/nm: a. 2.2; b. 3.2; c. 3.8; d. 4.3; e. 4.8.

Fig.5 Relationship between current density of the Pt/C catalysts for formic acid oxidation and average sizes of Pt particles in the Pt/C catalysts

Fig.6 Chronoamperometric curves of Pt/C catalysts with different Pt particles sizes in 0.5 mol/L H2SO4 + HCOOH solution at 0.60 V Pt particle size/nm: a. 2.2; b. 3.2; c. 3.8; d. 4.3; e. 4.8.

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