一维/二维复合碳载体组成对Pd催化剂甲醇氧化性能的影响  

Effect of One-Dimensional/Two-Dimensional Composite Carbon Support on Methanol Oxidation Performance of Pd Catalysts

作　　者：袁倩星 陈维民[1] 吕新荣 YUAN Qian-Xing;CHEN Wei-Min;Lü Xin-Rong(School of Environmental and Chemical Engineering,Shenyang Ligong University,Shenyang 110159,China)

机构地区：[1]沈阳理工大学环境与化学工程学院,沈阳110159

出　　处：《无机化学学报》2022年第11期2165-2172,共8页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21273152)资助。

摘　　要：采用固相-液相两步混合法制备了由碳纳米管(CNTs)和石墨烯纳米片(GNPs)组成的CNTs-GNPs复合载体。以乙二醇还原法将Pd纳米粒子沉积于复合碳载体上,制得Pd/CNTs-GNPs催化剂。以透射电子显微镜、X射线衍射及X射线光电子能谱表征催化剂的形貌、组成和结构;以电化学方法考察催化剂的甲醇电氧化性能。结果表明,Pd/CNTs-GNPs(1/4)(GNPs质量分数为1/4)催化剂具有较大的电化学表面积和较高的甲醇电氧化活性,其甲醇氧化峰电流密度可达Pd/CNTs催化剂的1.97倍。催化剂的高活性得益于CNTs-GNPs载体的一维/二维复合结构使Pd纳米粒子具有良好的分散性能。计时电流实验表明,与单一载体负载Pd催化剂相比,复合载体负载Pd催化剂具有较强的抗中毒能力。CNTs-GNPs,hybrid support composed of carbon nanotubes(CNTs)and graphene nanoplates(GNPs)was prepared by a solid phase-liquid phase two-step mixing method.The Pd/CNTs-GNPs catalyst was prepared by deposition of Pd nanoparticles on composite carbon support by the ethylene glycol reduction method.The morphologies,compositions,and structures of catalysts were characterized by transmission electron microscopy,X-ray diffraction,and X-ray photoelectron spectroscopy.The performances of catalysts for methanol electrooxidation were investigated by electrochemical methods.The results showed that Pd/CNTs-GNPs(1/4)(the mass fraction of GNPs was 1/4)catalyst exhibited a large electrochemical surface area and high performances for methanol electrooxidation,and its peak current density of methanol oxidation was 1.97 times that of the Pd/CNTs catalyst.The high activity of the catalyst is attributed to the good dispersion of Pd nanoparticles on the one-dimensional/two-dimensional composite CNTs-GNPs support.The chronoamperometry test showed that Pd catalysts supported on the CNTs-GNPs hybrid support had stronger anti-poisoning abilities as compared to the Pd catalyst supported on a single carbon support.

关 键 词：催化剂 钯 碳纳米管 石墨烯纳米片 甲醇电氧化 

分 类 号：O643.36[理学—物理化学]