催化剂载体对硼氢化钠在纳米金电极上电氧化行为的影响  

Effect of Catalyst Supporter on Electrooxidation of Sodium Borohydride on Gold Electrode

作　　者：裴斧[1] 王先友[1] 何培瑛 王雁生[1] 王宏[1] 易兰花[1] 陈权启[1] 

机构地区：[1]湘潭大学化学学院环境友好化学与应用教育部重点实验室,湖南湘潭411105

出　　处：《化学学报》2010年第2期136-142,共7页Acta Chimica Sinica

基　　金：湖南省教育重点资助项目(No.08A067)

摘　　要：分别以中孔炭(MPC)和VXC-72R炭黑作载体,制备了中孔炭载纳米Au粒子(Au/MPC)和VXC-72R炭黑载纳米Au粒子(Au/CB),并将其用作直接硼氢化钠燃料电池阳极电氧化催化剂.分别用X-射线衍射(XRD)、透射电镜(TEM)等比较了不同载体催化剂的结构和形貌.结果表明,纳米Au粒子均为面心立方结构,Au/MPC中纳米Au粒子的粒径为16nm左右比Au/CB中的纳米Au粒子的更小,且均匀分散在载体的表面.用循环伏安曲线和动电位极化曲线等比较了不同载体催化剂的电化学特性.结果表明,Au/CB的电流密度为38.10mA·cm-2,而Au/MPC的电流密度达到42.88mA·cm-2,比Au/CB的电流密度提高了12.5%.The nanosized Au particles supported by mesoporous carbon（MPC） and VXC-72R carbon black（CB） were prepared as catalyst for the direct oxidation of sodium borohydride,and labeled as Au/MPC and Au/CB,respectively.The structure and surface morphology of Au/MPC and Au/CB were characterized by X-ray diffraction（XRD） and transmission electron microscopy（TEM）.The results showed that the nanosized Au particles had a face cubic structure and were uniformly distributed on the surfaces of the mesoporous carbon and VXC-72R carbon black.Besides,the size of the Au particles supported by the mesoporous carbon was about 16 nm,which was apparently less than that supported by the VXC-72R carbon black.The electrochemical properties of the samples were investigated by the cyclic voltammogram and linear potential sweeping.It was found that the peak current of BH-4 oxidation on the Au/MPC electrode was 42.88 mA·cm^-2,which was 12.5% higher than that on the Au/CB electrode（38.10 mA·cm^-2）.

关 键 词：直接硼氢化钠燃料电池 阳极催化剂 催化剂载体 电氧化 

分 类 号：O646.54[理学—物理化学]