Mo掺杂对Pt/C催化剂乙醇氧化催化性能的影响

doi:10.15541/jim20130663

无机材料学报 ›› 2014, Vol. 29 ›› Issue (10): 1044-1048.DOI: 10.15541/jim20130663

Mo掺杂对Pt/C催化剂乙醇氧化催化性能的影响

李琳, 原鲜霞, 夏小芸, 杜娟, 马忠, 马紫峰

(上海交通大学化学化工学院, 上海 200240)

收稿日期:2013-12-16 修回日期:2014-02-21 出版日期:2014-10-20 网络出版日期:2014-09-22
作者简介:李琳(1990–), 女, 硕士研究生. E-mail: lily41015@163.com
基金资助:
国家自然科学基金重点项目(21176155);上海市重点基础研究项目(10JC1406900)

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

LI Lin, YUAN Xian-Xia, XIA Xiao-Yun, DU Juan, MA Zhong, MA Zi-Feng

(School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)

Received:2013-12-16 Revised:2014-02-21 Published:2014-10-20 Online:2014-09-22
About author:LI Lin. E-mail: lily41015@163.com
Supported by:
National Natural Science Fundation of China (21176155);Science and Technology Commission of Shanghai Municipality (10JC1406900)

摘要/Abstract

摘要：

直接乙醇燃料电池(DEFC)由于其高能量密度、绿色无污染等优势受到广泛关注, 寻找和开发具有高乙醇氧化催化活性和抗CO中毒能力的阳极催化剂对DEFC的未来发展和商业应用具有重要意义。本研究采用微波法合成了一系列Mo掺杂的Pt/C催化剂, 并通过循环伏安法、交流阻抗法、计时电流法等电化学技术考察了Mo的掺杂量对Pt/C催化剂乙醇氧化催化活性和稳定性的影响。结果表明: Pt₂Mo/C催化剂在乙醇氧化催化过程中表现出与Pt/C相当的起始电位、最大的峰电流密度和最慢的衰减速度, 说明该催化剂具有最高的乙醇氧化催化活性和最稳定的工作性能。

关键词: Mo掺杂Pt/C催化剂, 微波合成法, 乙醇氧化

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

中图分类号:

TM911

李琳, 原鲜霞, 夏小芸, 杜娟, 马忠, 马紫峰. Mo掺杂对Pt/C催化剂乙醇氧化催化性能的影响[J]. 无机材料学报, 2014, 29(10): 1044-1048.

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.

图/表 7

图1 不同Mo掺杂量的Pt/C催化剂的TEM照片

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

图2 不同Mo掺杂量的Pt/C催化剂在硫酸乙醇溶液中的循环伏安曲线

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

图3 不同Mo掺杂量的Pt/C催化剂在硫酸乙醇溶液中的交流阻抗谱

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

图4 不同Mo掺杂量的Pt/C催化剂在硫酸乙醇溶液中的计时电流曲线

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

图5 Pt/C催化剂在硫酸乙醇溶液中的150圈循环伏安曲线

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

表1 不同Mo掺杂量的Pt/C催化剂在硫酸乙醇溶液中扫描150次的峰电流密度及衰减速度

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

图6 不同Mo掺杂量的Pt/C催化剂在硫酸乙醇溶液中的150圈循环伏安曲线

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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Mo掺杂对Pt/C催化剂乙醇氧化催化性能的影响

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

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