物理化学学报 >> 2011, Vol. 27 >> Issue (10): 2373-2378.doi: 10.3866/PKU.WHXB20111008

电化学和新能源 上一篇    下一篇

铂纳米空球的制备及其对甲醇氧化的电催化性能

饶贵仕1, 程美琴1, 钟艳1, 邓小聪1, 易飞1, 陈治仁1, 钟起玲1, 范凤茹2, 任斌2, 田中群2   

  1. 1. 江西师范大学化学化工学院, 南昌 330022;
    2. 厦门大学化学化工学院化学系, 固体表面物理化学国家重点实验室, 福建厦门 361005
  • 收稿日期:2011-03-29 修回日期:2011-07-18 发布日期:2011-09-27
  • 通讯作者: 钟起玲 E-mail:zhqiling@163.com
  • 基金资助:

    国家自然科学基金(20663002), 厦门大学固体表面物理化学国家重点实验室基金(200511)和江西省自然科学基金(0620025)资助项目

Preparation of High Catalytic Platinum Hollow Nanospheres and Their Electrocatalytic Performance for Methanol Oxidation

RAO Gui-Shi1, CHENG Mei-Qin1, ZHONG Yan1, DENG Xiao-Cong1, YI Fei1, CHEN Zhi-Ren1, ZHONG Qi-Ling1, FAN Feng-Ru2, REN Bin2, TIAN Zhong-Qun2   

  1. 1. College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China;
    2. State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, P. R. China
  • Received:2011-03-29 Revised:2011-07-18 Published:2011-09-27
  • Contact: ZHONG Qi-Ling E-mail:zhqiling@163.com
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20663002), Foundation of State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, China (200511) and Natural Science Foundation of Jiangxi Province, China (0620025).

摘要: 以粒径为100 nm的硒球作模板, 在室温下批量合成了粒径约110 nm、壳厚约5 nm的铂空球. 采用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、高分辨透射电子显微镜(HR-TEM)、选区电子衍射(SAED)、X射线衍射(XRD)、能量色散X射线谱(EDX)等检测技术表征了其形貌与结构; 以甲醇为探针分子研究了铂纳米空球修饰玻碳电极对甲醇电氧化的催化性能. 结果表明, 由铂原子簇团构筑的多孔铂空球粒径均匀、分散性好、结构稳定、比表面积大、传质性能好, 是甲醇氧化的理想催化材料. 循环伏安(CV)结果表明: 当甲醇氧化的电流密度为0.10 mA·cm-2, 正扫时, 铂纳米空球的氧化电位与实心铂纳米粒子及铂黑相比, 分别负移了约110 和64mV; 负扫时, 前者比后两者分别负移了约51 与13 mV. 经800 圈循环伏安扫描后, 正扫时, 甲醇在铂纳米空球上氧化峰的电流密度为实心铂纳米粒子及铂黑上的13和15倍; 负扫时, 前者为后两者的19和38倍. 表明铂纳米空球对甲醇氧化具有较好的催化活性和稳定性.

关键词: 铂纳米空球, 硒球模板, 制备, 电催化, 甲醇氧化

Abstract: Pt hollow nanospheres with a particle diameter of 110 nm and a shell thickness of about 5 nm were synthesized in bulk using selenium colloids with a particle diameter of 100 nm as a template. Transmission electron microscopy (TEM), high resolution transmission electron microscopy (HR-TEM), selected area electron diffraction (SAED), X-ray diffraction (XRD), energy dispersive X-ray spectrocopy (EDX), and scanning electron microscopy (SEM) were used to determine their morphologies and structures. The electrocatalytic activity of the Pt hollow nanospheres modifying glassy carbon electrode toward methanol oxidation was measured by using methanol as the probe molecule. We show that the multiporous Pt hollow nanospheres composited of atomic clusters have a uniform particle size, good dispersity, a stable structure, a big surface area and good mass transfer performance. Cyclic voltammetry (CV) showed that when the current density of methanol oxidation was 0.10 mA·cm-2 and upon positive scanning the methanol oxidation potential of the Pt hollow nanospheres was around 110 and 64 mV negative than that of the Pt solid nanoparticles and Pt black, respectively. Upon negative scanning the former species was about 51 and 13 mV negative than that of the latter two species, respectively. After 800 segments cyclic voltammetry scanning, upon positive scanning the peak current density of methanol oxidation on the Pt hollow nanospheres was found to be 13 and 15 times as high as that of the Pt solid nanoparticles and Pt black, respectively. Upon negative scanning the former species was about 19 and 38 times as high as that of the two latter species. Our experimental results show that the Pt hollow nanospheres have good electrocatalytic activity and stability toward methanol oxidation.

Key words: Platinum hollow nanospheres, Selenium sphere template, Preparation, Electrocatalysis, Methanol oxidation

MSC2000: 

  • O646