Pt/C催化剂对甲酸电催化氧化的粒径效应

doi:10.7503/cjcu20140156

高等学校化学学报 ›› 2014, Vol. 35 ›› Issue (11): 2455.doi: 10.7503/cjcu20140156

Pt/C催化剂对甲酸电催化氧化的粒径效应

王彦恩¹, 曹爽¹, 武伟红¹, 吴敏², 唐亚文², 陆天虹²()

1. 河北农业大学理学院, 现代科技学院, 保定 071000
2. 南京师范大学化学与材料科学学院, 南京 210097

收稿日期:2014-03-03 出版日期:2014-11-10 发布日期:2014-10-20
作者简介:联系人简介: 陆天虹, 男, 教授, 主要从事化学电源研究. E-mail:tianhonglu@263.net
基金资助:
国家自然科学基金(批准号: 21073094, 21273116, 61171015)和江苏高校优势学科建设工程项目(批准号: 10KJB150007)资助

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

WANG Yanen¹, CAO Shuang¹, WU Weihong¹, WU Min², TANG Yawen², LU Tianhong^2,^*()

1. Department of Morden Sciences & Technology, College of Science, Hebei Agricultural University, Baoding 071000, China
2. School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210097, China

Received:2014-03-03 Online:2014-11-10 Published:2014-10-20
Contact: LU Tianhong E-mail:tianhonglu@263.net
Supported by:
† Supported by the National Natural Science Foundation of China(Nos.21073094, 21273116, 61171015) and the Priority Academic Program Development of Jiangsun Higher Education Institutions, China(No.10KJB150007)

摘要/Abstract

摘要：

在甲醇溶剂中, 利用SnCl₂作为还原剂, 通过控制反应条件制备了具有不同粒径Pt粒子的炭载Pt(Pt/C)催化剂. X射线衍射(XRD)和透射电子显微镜(TEM)的结果表明, Pt/C催化剂中Pt粒子具有高度的均一性和良好的分散度. 电化学研究结果显示, 对于甲酸的电催化氧化, Pt/C催化剂存在着明显的粒径效应. 当Pt粒子粒径为3.2 nm时, Pt/C催化剂对甲酸的电催化氧化活性最佳. Pt/C催化剂对甲酸氧化的粒径效应与其表面含氧基团含量、 Pt粒子的比表面积及相对结晶度相关.

关键词: 铂催化剂, 甲酸氧化, 粒径效应, 电催化

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

中图分类号:

O646

TrendMD:

王彦恩, 曹爽, 武伟红, 吴敏, 唐亚文, 陆天虹. Pt/C催化剂对甲酸电催化氧化的粒径效应. 高等学校化学学报, 2014, 35(11): 2455.

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^†. Chem. J. Chinese Universities, 2014, 35(11): 2455.

图/表 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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Pt/C催化剂对甲酸电催化氧化的粒径效应

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

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Pt/C催化剂对甲酸电催化氧化的粒径效应

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

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