掺杂Eu对Pt-Ru/C电催化氧化甲醇的活性稳定性影响  

Activity Stability of Pt-Ru/C Doped with Eu for Methanol Electro-Catalytic Oxidation

作　　者：李一兵[1] 刘世斌[1] 王秀光[1] 段东红[1] 张忠林[1] 郝晓刚[1] 

机构地区：[1]太原理工大学,山西太原030024

出　　处：《稀有金属材料与工程》2011年第3期466-469,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金项目(20676088);国家"863"项目(2006AA05Z139)

摘　　要：应用预置活性物前驱体脉冲电沉积法制备了稀土Eu元素掺杂的Pt-Ru/C甲醇电氧化催化剂,循环伏安法考察催化剂的活性,XRD和XPS技术表征活性体的物理结构、表面元素组成。结果表明,在循环电位扫描的第15～50周期,Pt-Ru-Eu/C的活性呈现缓慢下降的趋势,在第65周期以后,活性逐渐恒定;在活性实验全程范围内其活性高于Pt-Ru/C。Pt-Ru-Eu/C活性降低的主要原因是,随着实验时间的延长,催化剂活性物表面的Eu2O3流失,纳米合金微粒的粒径增大。A catalyst of the Pt-Ru/C doped with Eu for methanol electro-oxidation were synthesized by the method of pulse electro-deposition of the precursor of active material impregnated in porous carbon black layer.The active stability of Pt-Ru-Eu/C was evaluated using cyclic voltammetry.And the microstructure and composition of the catalyst surface were characterized by XRD and XPS.Results show that the performances of Pt-Ru-Eu/C for methanol electro-oxidation went down slowly during the cycles of number 15 to number 50,and then went into the steady state after the cycle of number 65.However,the electro-catalytic activity of Pt-Ru-Eu/C is still higher than that of Pt-Ru/C in all the cycles of the activity test.The main reason of the low activity for methanol electro-catalytic oxidation on the Pt-Ru-Eu/C is the serious loss of the EuOx from the top atom layer and the increasing of the size of Pt-Ru-Eu alloy particles with the activity test time prolonging.

关 键 词：甲醇电催化氧化 Pt-Ru/C 稀土元素掺杂 活性稳定性 

分 类 号：TM911.4[电气工程—电力电子与电力传动]