碳纳米管载体改性条件对Pt纳米粒子电催化氧化性能的影响

doi:10.15541/jim20140581

无机材料学报 ›› 2015, Vol. 30 ›› Issue (9): 931-936.DOI: 10.15541/jim20140581

碳纳米管载体改性条件对Pt纳米粒子电催化氧化性能的影响

徐明丽^1,3, 段奔^2,3, 张英杰^2,3, 杨国涛¹, 董鹏^2,3, 夏书标^2,3, 杨显万^2,3

(1. 昆明理工大学理学院, 昆明 650093; 2. 昆明理工大学冶金与能源工程学院, 昆明 650093; 3. 云南省发改委先进电池及材料工程实验室, 昆明 650093)

收稿日期:2014-11-14 修回日期:2015-01-14 出版日期:2015-09-20 网络出版日期:2015-08-19
作者简介:徐明丽(1978–), 女, 博士, 副教授. E-mail: xumingli0326@gmail.com
基金资助:
国家自然科学基金(51164017,51374117, 21363012)

Effect of Modification Factors of MWCNTs Support on Electrocatalytic Performance of Pt Nanoparticles

XU Ming-Li^1,3, DUAN Ben^2,3, ZHANG Ying-Jie^2,3, YANG Guo-Tao¹, DONG Peng^2,3, XIA Shu-Biao^2,3, YANG Xian-Wan^2,3

(1. Faculty of Science, Kunming University of Science and Technology, Kunming 650093, China; 2. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China; 3. Engineering Laboratory for Advanced Batteries and Materials, Kunming 650093, China)

Received:2014-11-14 Revised:2015-01-14 Published:2015-09-20 Online:2015-08-19
About author:XU Ming-Li. E-mail: xumingli0326@gmail.com
Supported by:
National Natural Science Foundation of China (51164017, 51374117, 21363012)

摘要/Abstract

摘要：

利用紫外光照射诱导亚甲基蓝改性碳纳米管(MWCNTs), 是一种工艺简单、绿色无毒的改性催化剂碳载体的新方法。本研究以光照改性时间、改性剂(亚甲基蓝)用量和紫外光波长为主要影响因素, 系统研究了不同因素对MWCNTs改性的影响及其对催化剂催化性能的影响。利用透射电子显微镜(TEM)对不同条件下的催化剂形貌进行了表征, 采用循环伏安法(CV)和时间电流法(i-t)等电化学测试手段对催化剂在碱性介质中催化氧化甲醇的催化活性和催化稳定性分别进行了测试, 研究结果表明: 光照时间为6 h、亚甲基蓝用量为10 mg、紫外光波长采用254 nm时, MWCNTs的改性效果最佳, Pt纳米粒子在改性最佳的MWCNTs表面的负载均匀性最好, 所得催化剂的催化性能也最优, 其催化活性是商业Pt/C催化剂的2倍多, 这种改性方式为高活性、低成本燃料电池阳极催化剂的研究提供了新方法。

关键词: 碳纳米管改性, 紫外光照射, 亚甲基蓝, 甲醇氧化, Pt纳米粒子

Abstract:

A simple and green method of modified multi-wall carbon nanotubes (MWCNTs) by methylene blue under ultraviolet irradiation was reported. The irradiation time, methylene blue dosage and ultraviolet wavelength were considered as the three main factors. The different factors of functionalized MWCNTs and their catalytic performance were systematically studied. TEM was used to indicate the catalyst morphology. Cyclic voltammetric and chronoamperometric experiments were used to study catalytic activity and stability for methanol in alkaline solution. The results showed that the optimal conditions of irradiation time, methylene blue dosage and ultraviolet wavelength are 6 h, 10 mg and 254 nm, respectively. Under these conditions, catalyst has the best dispersion of Pt nanoparticles on the surface of functionalized MWCNTs, realizing the best catalytic performance, with catalytic activity at 2-fold of that of the commercial Pt/C catalyst. This modification of MWCNTs provides a new way for achieving anode catalysts with high activity and low cost in the fuel cells.

Key words: MWCNTs modification, ultraviolet irradiation, methylene blue, methanol oxidation, Pt nanoparticles

中图分类号:

TQ174

徐明丽, 段奔, 张英杰, 杨国涛, 董鹏, 夏书标, 杨显万. 碳纳米管载体改性条件对Pt纳米粒子电催化氧化性能的影响[J]. 无机材料学报, 2015, 30(9): 931-936.

XU Ming-Li, DUAN Ben, ZHANG Ying-Jie, YANG Guo-Tao, DONG Peng, XIA Shu-Biao, YANG Xian-Wan. Effect of Modification Factors of MWCNTs Support on Electrocatalytic Performance of Pt Nanoparticles[J]. Journal of Inorganic Materials, 2015, 30(9): 931-936.

图/表 6

图1 Pt纳米溶胶的 UV-Vis吸收光谱图

Fig. 1 UV-Vis absorption spectra of Pt precursor solution after ultraviolet irradiation

图2 不同紫外光照时间下制备Pt/fx-MWCNTs的TEM照片

Fig. 2 TEM images of the Pt/fx-MWCNTs at different irradiation time (a) 2 h; (b) 4 h; (c) 6 h; (d) 8 h

图3 不同亚甲基蓝用量下制备Pt/fx-MWCNTs的TEM照片

Fig. 3 TEM images of the Pt/fx-MWCNTs at different methylene blue dosages (a) 5 mg; (b)10 mg, (c) 15 mg; (d) 20 mg

图4 不同波长紫外光照射下制备Pt/fx-MWCNTs(x=A、B、C)的TEM照片

Fig. 4 TEM images and XRD pattern of the Pt/fx-MWCNTs at different ultraviolet wavelengths (a) 254 nm; (b) 300 nm; (c) 365 nm; (d) XRD pattern of the Pt/fx-MWCNTs catalyst

图5 不同改性条件下Pt/fx-MWCNTs的循环伏安曲线

Fig. 5 Cyclic voltammograms of the Pt/fx-MWCNTs under different functional conditions (a) Irradiation time; (b) Methylene blue dosage; (c) Ultraviolet wavelength

图6 不同改性条件下Pt/fx-MWCNTs的计时电流曲线

Fig. 6 Chronoamperograms of the Pt/fx-MWCNTs at different functional condition (a) Irradiation time; (b) Methylene blue dosage; (c) Ultraviolet wavelength

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碳纳米管载体改性条件对Pt纳米粒子电催化氧化性能的影响

Effect of Modification Factors of MWCNTs Support on Electrocatalytic Performance of Pt Nanoparticles

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