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

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

Abstract:

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