摘要
在 Na OH水溶液中利用三电极体系对硼砂在阴极上电化学还原生成硼氢化钠的特性进行了研究 ,评价了 Ni、Cu- Hg、Ag电极的还原活性。电化学测试表明 ,BO2 - 在阴极还原是间接的电化学还原过程 ,阴极反应的本质是 H2 O的电化学还原 ,由于电荷的排斥作用 ,BO2 -阴离子难于接近阴极表面 ,研究发现利用脉冲电源产生的适量正脉冲 ,可以实现 BO2 - 阴离子在阴极表面的吸附 ,使还原易于进行。
The electrochemical reduction characteristic of borate for preparing sodium borohydride in the sodium hydroxide aqueous solution was inv estigated by a three-electrode cell system. The electrode activity of Ni, Cu-Hg and Ag was evaluated. The results shows that in cathode the electrochemical reduction of BO 2 - was an indirect reduction process. The characteristics of cathode reaction is electrochemical reduction of H2O; negative ion BO 2 - was indirect reduced because of electron repelling effect. We discovered that when electrode was input some positive pulse generated from pulse power , the negative ion can be absorbed on the cathode surface so that the reducing reaction is direct.
出处
《化工技术与开发》
CAS
2003年第3期1-3,8,共4页
Technology & Development of Chemical Industry
基金
广西留学回国人员基金 [2 0 0 0 90 0 5 ]
关键词
硼酸盐
电化学还原
特性
脉冲电源
硼氢化钠
pulse power
electrochemical reduction
sodium borohydride
borate
