Nanoporous Pd with Tunable Pore Size prepared by Dealloying Pd 30Cu40Ni10P20 Metallic Glass and Their Catalytic Performance

This work reports the formation of nanoprous Pd with tunable pore size and high stability by dealloying Pd30Cu40Ni10P20 metallic glass. The results show that lower dealloying temperature results in smaller pore size while the dealloying duration does not cause distinct change in the porous structure, even at an ambient dealloying temperature. The glassy structure and the multiple components in the precursor alloy are attributed to the hindered diffusion of Pd atoms and a slow coarsening rate of the nanoprous structure. The fully dealloyed porous sample with the smallest average pores size of 10 nm exhibit much higher catalytic activity when compare with the commercial Pd/C catalysts while the specimen with an average pores size of 13 nm shows the highest catalytic stability among the fully dealloyed alloys.本工作报道了通过对Pd30Cu40Ni10P20金属玻璃进行脱合金（dealloying）处理，制备得到孔径可调且稳定性优异的纳米多孔钯（Pd）材料。研究结果显示，脱合金温度越低，所得多孔结构的孔径越小；而脱合金时长对多孔结构无显著影响，即便在室温脱合金条件下亦是如此。前驱体合金的玻璃态结构与多组分特征，可归因于钯原子扩散受阻以及纳米多孔结构的粗化速率缓慢。平均孔径为10 nm的完全脱合金多孔样品，其催化活性远高于商用Pd/C催化剂；而平均孔径为13 nm的样品，则在所有完全脱合金合金中展现出最优的催化稳定性。