MCl_x(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  

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

作　　者：孙盾[1] 何建平[1] 周建华[1] 王涛[1] 狄志勇[1] 王道军[1] 丁晓春[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,南京210016

出　　处：《物理化学学报》2010年第2期385-391,共7页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(50871053);航空科学基金(2007ZF52061)资助项目~~

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120.2m2.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.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 form of 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 m^2·g^-1 followed by Pt/OMC-CrCla 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.

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 

分 类 号：O643.36[理学—物理化学]