직접 에탄올 연료전지(DEFC)의 anode용 삼원소 전극촉매[Pt5Ru4M(M= Ni, Sn, Mo and W)]의 에탄올 전기산화반응에 관한 연구

This work was carried out to improve the performance of anodic electrocatalysts in direct ethanol fuel cell(DEFC). PtRu and Pt5Ru4M(M= Ni, Sn, Mo and W) electrocatalysts were prepared by using a NaBH4 reduction method. Alloy crystal structure and particle size of electrocatalysts were characterized by X-ray diffraction(XRD) and transmission electron microscopy(TEM). The XRD analysis of the electrocatalysts revealed that the face-centered cubic(fcc) peaks shifted to slightly higher diffraction angles when third metals were added. Average size of the uniform particles was observed to be approximately 3～3.5 nm from the TEM image. The electrochemical measurements were carried out in the solution 1M H2SO4 and 1M C2H5OH at room temperature. Cyclic-voltammogram results showed that Pt5Ru4W electrocatalyst exhibited much higher current density for ethanol oxidation of 2.73 mA/cm2 than PtRu electrocatalyst of 0.73 mA/cm2.