物理化学学报 >> 2010, Vol. 26 >> Issue (02): 385-391.doi: 10.3866/PKU.WHXB20100121

催化和表面结构 上一篇    下一篇

MClx(M=Pd, Fe, Cr)对有序介孔碳的辅助合成及其负载Pt后的电催化性能

孙盾, 何建平, 周建华, 王涛, 狄志勇, 王道军, 丁晓春   

  1. 南京航空航天大学材料科学与技术学院, 南京 210016
  • 收稿日期:2009-07-06 修回日期:2009-09-04 发布日期:2010-01-26
  • 通讯作者: 何建平 E-mail:jianph@nuaa.edu.cn

MClx(M=Pd, Fe, Cr) Assisted Synthesis of Ordered Mesoporous Carbon and Their Electrocatalytic Performance after Loading with Pt Nanoparticles

SUN Dun, HE Jian-Ping, ZHOU Jian-Hua, WANG Tao, DI Zhi-Yong, WANG Dao-Jun, DING Xiao-Chun   

  1. College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P. R. China
  • Received:2009-07-06 Revised:2009-09-04 Published:2010-01-26
  • Contact: HE Jian-Ping E-mail:jianph@nuaa.edu.cn

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摘要：

以MClx(M=Pd, Fe, Cr; x=2, 3, 3)为金属源, 辅助合成有序介孔碳(OMC), 以改善其负载Pt后的电催化性能. X射线衍射(XRD)和透射电镜(TEM)测试结果显示, 适量PdCl2的引入并未破坏介孔碳的有序结构, 由于经历有机碳的高温裂解, OMC-PdCl2主要以金属Pd为存在形式, 较为均一嵌入OMC的骨架中, 并在负载Pt的过程中与Pt形成二元催化剂. 电化学氢吸附-脱附测试结果表明, Pt/OMC-MClx表现出优异的催化性能, 电化学活性面积为Pt/OMC的2-4倍; 其中Pt/OMC-PdCl2最佳, 活性面积达120.2 m2·g-1, Pt/OMC-CrCl3和Pt/OMC-FeCl3次之. 此外, Pt/OMC-MClx还具有良好的催化稳定性, 经100个循环测试后, 依然保持较高的催化活性, 仅衰减22%-40%, 使得该材料在催化领域具有很好的应用前景.

关键词: 金属盐, 辅助催化, 氢吸附-脱附, 催化稳定性, 有序介孔碳

Abstract:

The Pt-loading properties of ordered mesoporous carbon (OMC) synthesized with assistance of MClx (M=Pd, Fe, Cr; x=2, 3, 3) were investigated. X-ray diffraction (XRD) and transmission electron microscope (TEM) show that the ordered structure is well-preserved after the introduction of PdCl2. Because of the pyrolysis of organic carbon the OMC-PdCl2 is mainly present in the formof metallic Pd and is homogenously embedded into the scaffold of the OMC. A binary catalyst comprised of metallic Pd and microwave-reduced Pt nanoparticles was also generated. Electrochemical hydrogen absorption-desorption tests reveal that Pt/OMC-MClx possesses excellent catalytic performance and has an electrochemical active surface area (SEA) being as 2-4 times as that of Pt/OMC. Pt/OMC-PdCl2 has the highest SEA of 120.2 m2·g-1 followed by Pt/OMC-CrCl3 and then Pt/OMC-FeCl3. After a long-term cyclic voltammetric test, Pt/OMC-MClx still exhibits excellent catalytic stability and relatively higher catalytic activity as evidenced by a 22%-40% decrease in catalytic activity after one hundred cycles. This work will open up a most promising application in catalysis.

Key words: Metal salt, Assisted catalysis, Hydrogen absorption-desorption, Catalytic stability, Ordered mesoporous carbon

MSC2000: 

  • O648