催化学报 ›› 2014, Vol. 35 ›› Issue (2): 185-195.DOI: 10.1016/S1872-2067(12)60729-3

• 研究论文 • 上一篇    下一篇

MOF(Fe)的制备及其氧气还原催化性能

宋国强a, 王志清a, 王亮c, 李国儒c, 黄敏建c, 银凤翔b,c   

  1. a 常州大学制药与生命科学学院, 江苏常州213164 ;
    b 北京化工大学有机无机复合材料国家重点实验室, 北京100029;
    c 北京化工大学常州先进材料研究院, 江苏常州213164
  • 收稿日期:2013-07-31 修回日期:2013-10-15 出版日期:2014-01-16 发布日期:2014-01-17
  • 通讯作者: 银凤翔
  • 基金资助:

    国家自然科学基金(21276018);北京市优秀人才培养资助项目(2012D009016000003);江苏省自然科学基金(BK2012596);常州市科技计划(工业支撑)项目(CE20120034).

Preparation of MOF(Fe) and its catalytic activity for oxygen reduction reaction in an alkaline electrolyte

Guoqiang Songa, Zhiqing Wanga, Liang Wangc, Guoru Lic, Minjian Huangc, Fengxiang Yinb,c   

  1. a College of Pharmacy & Life Science, Changzhou University, Changzhou 213164, Jiangsu, China;
    b State Key Laboratory of Organic-inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China;
    c Changzhou Institute of Advanced Materials, Beijing University of Chemical Technology, Changzhou 213164, Jiangsu, China
  • Received:2013-07-31 Revised:2013-10-15 Online:2014-01-16 Published:2014-01-17
  • Contact: Fengxiang Yin
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21276018), the Beijing Outstanding Talents Project (2012D009016000003), the Natural Science Foundation of Jiangsu Province (BK2012596), and the Changzhou Science and Technology Program (Industrial Support) (CE20120034).

摘要:

以硝酸铁为金属离子前驱体、均苯三甲酸为有机配体,采用水热法合成了金属有机骨架MOF(Fe)催化剂,应用X射线衍射、N2吸附-脱附、透射电镜、红外光谱和热重等方法对催化剂的结构进行了表征,并采用循环伏安法测试了催化剂在碱性电解质中的氧气还原(ORR)催化性能,同时也采用旋转圆盘电极进一步研究了催化剂的ORR的动力学行为.?结果表明,所制MOF(Fe)具有很好的晶型结构、大比表面积、丰富的微孔以及较高的热稳定性. 且表现出很好的ORR催化活性. ORR的反应历程随电位的改变而改变:电位在-0.3到0.50 V范围内,ORR为2电子途径;随着电位从-0.50 V升至-0.95 V,ORR从2电子向4电子途径转变. 另外,该催化剂在碱性电解质中也表现出较好的氧气析出(OER)催化性能,这为制备用于ORR和OER的高效非贵金属催化剂提供了新的途径.

关键词: 金属有机骨架, 水热法, 氧气还原反应, 氧气析出反应, 锂-空气电池

Abstract:

Effective bifunctional catalysts play a vital role in large-scale commercial applications of rechargeable lithium-air batteries. In this article, a metal-organic framework, MOF(Fe), was prepared by a hydrothermal process using ferric nitrate as the metal ion precursor and trimesic acid as an organic ligand. The structure of the MOF(Fe) was characterized by X-ray diffraction, N2 adsorption-desorption, Transmission electron microscopy, Fourier transform infrared spectroscopy and Thermo-gravimetric analysis. The activity for the oxygen reduction reaction (ORR) and the kinetic behavior of the ORR using the MOF(Fe) were investigated by cyclic voltammetry and rotating disk electrode voltammetry, respectively, using an alkaline electrolyte. The characterization results showed that the MOF(Fe) was highly crystalline with abundant micropores, large specific surface area and high thermal stability. The MOF(Fe) exhibited excellent catalytic activity for the ORR. The ORR mechanism varies with the applied potentials. The ORR occurs through a two-electron pathway at potentials in the range of -0.30 to -0.50 V, but shifts to four-electron pathway with the potentials in the range -0.50 to -0.95 V. In addition, the MOF(Fe) shows excellent catalytic activity for the oxygen evolution reaction (OER) in an alkaline electrolyte. This work opens a new route for the development of effective non-precious metal catalysts based on MOFs for the ORR and OER.

Key words: Metal-organic frameworks, Hydrothermal process, Oxygen reduction reaction, Oxygen evolution reaction, Lithium-air battery