Nd_x作为助催化剂对PtRu/C电催化氧化甲醇活性的影响

The Effect of NdO_x as Co-catalyst for the Electro-oxidation of Methanol on PtRu/C

采用沉积-还原法制备了PtRu-NdOx/C催化剂,借助TEM、EDS和XRD等测试手段对其进行了微结构和组成的表征.结果表明,催化剂中Pt与Ru以合金形式存在,而Nd的氧化物则以无定形形态存在.催化剂粒子的平均粒径在2nm左右,晶胞参数为0.3896nm,Nd氧化物的加入对PtRu合金的晶体结构影响不明显.采用循环伏安法和计时电流法,比较了PtRu-NdOx/C催化剂和PtRu/C催化剂对甲醇氧化的电催化活性,结果表明,加入Nd的氧化物作为助催化剂能明显提高PtRu/C催化剂对甲醇氧化的电催化性能.

The PtRu-NdOx/C catalysts have been prepared by deposition-reduction method. EDX,XRD, and TEM measurements have been used to characterize the composition, particle size, and crystallinity of the catalysts. The catalyst materials consist of Pt-Ru alloy particles and varying amounts of Nd oxide. The average particle size and the lattice parameter of the catalysts are about 2 nm and 0.3896 nm, respectively, which indicates that Nd oxide in PtRu- NdOx/C has no effects on the crystal structure of the Pt-Ru alloy particles. The electrocatalytic activities of the PtRu- NdOx/C catalysts and PtRu/C catalysts have been investigated by cyclic voltammetry and chronoamperometric measurements. Nd oxide can improve the degree of dispersion of the noble metals in the catalysts and as co-catalyst lead to an improvement of the catalytic activity towards methanol oxidation.