石墨化的有序介孔碳的制备及其作为载体的Pt催化剂对甲醇的电催化氧化  

Synthesis of Highly Ordered and Graphitized Mesoporous Carbon Materials and Pt/mesoporous Carbon Catalyst for Methanol Electro-oxidation

作　　者：汤静[1] 何建平[1] 王涛[1] 郭云霞[1] 薛海荣[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：《化学学报》2011年第15期1751-1759,共9页Acta Chimica Sinica

基　　金：国家自然科学基金(No.50871053)资助项目

摘　　要：以低分子量的酚醛树脂为碳源,F127为模板剂,NiCl2为石墨化促进剂,通过一步模板法辅助合成有序介孔碳.X射线衍射(XRD)、激光拉曼和透射电子显微镜(TEM)等测试结果表明,Ni以金属颗粒的方式进入碳材料的骨架中,明显提高了有序介孔碳的石墨化程度,而碳的有序介孔结构几乎没有变化.在700℃热解温度下,Ni含量为5%时,可以清晰地观察到Ni周围呈现碳的石墨结构.在硫酸和甲醇溶液中进行循环伏安测试,结果显示,碳材料的石墨化有利于提高其电催化活性,含Ni 5%的碳载Pt催化剂电化学活性面积可达24.84 m2·g-1,甲醇氧化峰电流为3.92 mA.Highly ordered mesoporous carbon materials can be directly synthesized via one step templating route,using resol as a carbon precursor,triblock copolymer Pluronic F127 as a template agent and metal salt NiCl2 as an additive of catalytic graphitization.X-ray diffraction（XRD）,raman and transmission electron microscope（TEM） show that nickel particles are in the carbon structure in forms of metal nickel and the sample has the higher graphitization degree with ordered mesoporous structure.Under the condition of 700 ℃ and 5 wt% nickel content,we can find plentiful graphitic carbon surrounding Ni particle from the HRTEM photos.The electrocatalytic activity of carbon supported Pt nanoparticles was verified by cyclic voltammetry in H2SO4 and CH3OH solution.Carbon material with higher graphitization degree can enhance its electrocatalytic activity.Pt nanoparticles supported on the carbon material which contains five percent of Ni showed the best performance.Its electrochemical active surface area for hydrogen oxidation was 24.840 m2·g-1 and the peak current of methanol oxidation was 3.92 mA.

关 键 词：有序介孔碳 催化石墨化 碳载Pt催化剂 电催化活性 

分 类 号：O643.36[理学—物理化学]