纳米PbO/Ti电极催化还原偏硼酸锂制备硼氢化锂

Preparation of LiBH_4 by Electrocatalytic Reduction of LiBO_2 at a Nano-PbO/Ti Electrode

在乙二醇甲醚溶液中电解铅片,制备了铅醇盐配合物,然后将溶液直接水解、凝胶,再通过提拉法涂抹在钛丝表面,450℃煅烧2 h制备纳米PbO/Ti电极。将PbO/Ti电极在0.2～1.0 mol/L LiOH+0.1～0.5 mol/L LiBO2溶液测试催化还原性能,研究了影响电解还原LiBO2制备硼氢化锂(LiBH4)的主要因素,如LiBO2和LiOH浓度等。通过X射线粉末衍射和扫描电子显微镜对PbO/Ti电极和LiBH4进行了表征。实验表明,纳米PbO/Ti电极表面颗粒分散较好,修饰电极催化性能稳定,放电电流较大,产率和电流效率分别达15.6%和25.3%。

Lead alkoxide complexes were prepared by electrochemical dissolution of pure lead in the glycol solution. The PbO sols were achieved by the direct sol-gel process of electrolyte solution. The PbO sols coated on pure titanium substrate were calcined at 450 ~C for 2 h in a muffle furnace, the nano-PbO/Ti electrode was obtained. The electrocatalytic reduction activity of the nano-PbO/Ti electrode was investigated by cyclic voltammetry（CV） in solution containing 0. 2 ～ 1.0 mol/L LiOH and 0. 1 ～ 0. 5 mol/L LiBO2. The main factors of electrocatalytic reduction of LiBO2 to LiBH4, such as LiBO2 and LiOH concentrations, were studied. The mono-disperse structure and the diameter of nano-PbO/Ti electrode were observed by XRD and SEM, respectively. The results show that the nano PbO is uniformly dispersed on the electrode surface. The electrocatalytic reduction performance of nano-PbO/Ti electrode is stable. A yield of 15.6% and current efficiency of 25.3% were obtained respectively.