Solid/electrolyte interface phenomena during anodic polarization of Pd0.2M0.8 (M = Fe, Co, Ni) alloys in H2SO4
Solid/electrolyte interface phenomena during anodic polarization of Pd0.2M0.8 (M = Fe, Co, Ni) alloys in H2SO4
复制标题
DOI：
10.1016/j.jallcom.2010.01.019
复制
发表时间：
2010-04
影响因子：
6.2
通讯作者：
M. Hakamada;K. Tajima;K. Yoshimura;Y. Chino;M. Mabuchi
中科院分区：
文献类型：
--
作者：
M. Hakamada;K. Tajima;K. Yoshimura;Y. Chino;M. Mabuchi
Pd_(0.2)Fe_(0.8)、Pd_(0.2)Co_(0.8)和Pd_(0.2)Ni_(0.8)合金在H_2SO_4中电解制得纳米孔钯。具有不同表面敏感性的表面分析表明，Pd0.2Fe0.8和Pd0.2Ni0.8电解后，表层的Fe和Ni分别溶解在H_2SO_4中，但这种溶解仅限于表层。另一方面，Pd原子在固体/电解液界面的聚集使内部的Co原子暴露在电解液中，结果只有Pd0.2Co0.8合金形成纳米孔。这些实验结果表明，残余元素(在这种情况下是Pd)在固体/电解液界面上的聚集是通过去合金化形成纳米孔所必需的。
Pd0.2Fe0.8, Pd0.2Co0.8and Pd0.2Ni0.8alloys were subjected to electrolysis in H2SO4for production of nanoporous Pd. Surface analyses with different surface sensitivities revealed that Fe and Ni at the surface layer dissolve in H2SO4after the electrolysis of Pd0.2Fe0.8and Pd0.2Ni0.8, respectively, but this dissolution is confined to the surface layer. On the other hand, aggregation of Pd adatoms at the solid/electrolyte interface allowed exposure of internal Co atoms to the electrolyte, and as a result, nanoporosity formed only from Pd0.2Co0.8alloys. These results experimentally suggest that the aggregation of remnant element (Pd in this case) at solid/electrolyte interface is necessary for the formation of nanoporosity by dealloying.