Hou Yongjiang, Guo Jie, Li Bo, Wang Yaquan, Cai Yuxi, Zhou Zhenhuan
J Nanosci Nanotechnol. 2014 Sep;14(9):7319-24. doi: 10.1166/jnn.2014.8977.
Ni-B/Cu electrode prepared by the electroless deposition technique of chemical reduction of nickel ethylenediamine complex with BH4- was characterized by SEM, XRD and XPS techniques, respectively, and evaluated using ethanol electrocatalytic oxidation by the method of cyclic voltammetry. The as-prepared Ni-B/Cu electrode exhibited much higher electrocatalytic activity than the Ni-B/Cu electrode obtained via direct reduction of nickel metallic ions. The effects of the nickel ethylenediamine complex can be attributed to both the structural effect and electronic effect. The nickel ethylenediamine complex can not only make an electroless deposition stable and highly dispersed, but also facilitate the formation of more nanoscale microcrystalline Ni on the electrode surface, which increased the electrochemical oxidation activity. Moreover, ethylenediamine influenced the electronic states of Ni and B on the electrode surface, more electrons transfer from the B to Ni that the Ni active sites became more highly unsaturated, which could promote the form of adsorbed active ethanol.
采用化学还原乙二胺镍配合物与BH4-的化学镀技术制备的Ni-B/Cu电极，分别用扫描电子显微镜（SEM）、X射线衍射仪（XRD）和X射线光电子能谱仪（XPS）进行了表征，并采用循环伏安法对乙醇电催化氧化性能进行了评价。所制备的Ni-B/Cu电极比通过直接还原镍金属离子得到的Ni-B/Cu电极表现出更高的电催化活性。乙二胺镍配合物的作用可归因于结构效应和电子效应。乙二胺镍配合物不仅能使化学镀稳定且高度分散，还能促进电极表面形成更多纳米级微晶镍，从而提高电化学氧化活性。此外，乙二胺影响了电极表面Ni和B的电子态，更多电子从B转移到Ni，使Ni活性位点变得更加高度不饱和，这有助于促进吸附态活性乙醇的形成。
