氧化锡锑负载纳米Pd催化H2O2电还原反应的催化性能

摘要

分别以氧化锡锑(ATO)与活性炭(Vulcan XC-72)为载体,采用化学还原法制备了Pd/ATO及Pd/C催化剂,使用X射线衍射法及循环伏安曲线对催化剂进行了表征,通过线性伏安曲线及计时电流曲线考察了2种催化剂对H2O2电还原反应的催化性能.研究结果表明:Pd/ATO与Pd/C催化剂中Pd粒子的平均粒径分别为2.94 nm和8.27 nm,Pd/ATO催化剂的电化学比表面积更高,E=0.25 V时,Pd/ATO催化剂上H2O2还原反应的电流密度较Pd/C催化剂高约350 mA/mgpd,ATO提升了Pd催化剂的催化活性.%The Pd/ATO and Pd/C catalysts supported on the Sb-doped SnO2 and Vulcan XC-72 carbon powders, respectively, were prepared with chemical reduction method. The composition and structure of the catalysts were characterized with XRD and cyclic voltammetry. And the performance of the two catalysts on H2O2 reduction was studied by linear voltammetry and chronoamperometry. The results showed that the average particles size of Pd in the Pd/ATO and Pd/C catalysts were 2.94 ran and 8.27 nm, respectively. And the specific surface area of the Pd/ATO catalyst is larger than that of the Pd/C catalyst. The current density of the Pd/ATO catalyst on H2O2 electroreduction was 350 mA/mgPd, higher than that of Pd/C catalyst at ￡=0.25 V. The Sb-doped SnO2 advanced the performance of the Pd catalyst.