柠檬酸配比对合成钙钛矿型LaNiO_3催化剂结构的影响

Study on the effect of proportion of citric acid to the structure of perovskite LaNiO_3

以柠檬酸为配体,采用溶胶-凝胶法合成了钙钛矿型双功能氧电极催化剂LaNiO3.以热重-差热(TG-DTA)、X射线衍射分析(XRD)、扫描电子显微镜(SEM)等手段表征合成产物.结果表明,不同柠檬酸配比对干凝胶灰化、LaNiO3的结构和成分均有较大影响.当硝酸镧、硝酸镍与柠檬酸摩尔比在1:1:(0.6～0.7)时,可以制备出颗粒均匀的纳米棒状LaNiO3.并进一步探讨了足量和不足量柠檬酸配比对溶胶-凝胶形成、灰化,LaNiO3相纯度及空间结构的影响.

Perovskite LaNiO_3 used as a catalyst in bifunctional oxygen electrode was prepared by sol-gel method using citric acid as complexing agent,and products were characterized using TG-DTA,XRD,SEM,etc.The results showed that the proportion of citric acid had major influences on cineration of dried polymeric,the structure and component of LaNiO_3.Uniform nanoscaled LaNiO_3 rod was prepared when the mole ratio of lanthanum nitrate,nickel nitrate and citric acid was between 1∶1∶(0.6～0.7).Furthermore,the effect of sufficient or insufficient proportion of citric acid to the formation and cineration of sol-gel,the purity of phases and spatial structures of LaNiO_3 were discussed.