催化剂对碳纳米管及其电化学储能性能的影响∗

摘要

采用柠檬酸络合法制备出六方晶系结构的 LaNiO3和正交晶系结构的 La2 NiO42种催化剂前驱体,运用化学气相沉积法制得2种碳纳米管(CNT)。运用 XRD 对2种催化剂及其前驱体晶体进行结构分析,运用TEM、孔隙比表面分析仪对2种CNT进行形貌和结构的表征,并将2种CNT分别组装成电化学超级电容器,进行了电化学储能性能测试。研究结果表明,在制备工艺和条件一致的情况下,LaNiO3与 La2 NiO4在高温下分别还原为具有不同晶面含量的2种金属Ni纳米颗粒催化剂,通过该催化剂都可制备得到 CNT,但所得 CNT 的产率、形貌、孔结构参数以及电化学储能性能都存在较大差异。通过分析得出这样的结论,CNT 的产率、形貌和孔结构参数与催化剂有直接的关系,而CNT的形貌和孔结构参数又与其电化学储能性能有直接的关系。%The two catalyst precursors of LaNiO3 of hexagonal structure and La2 NiO4 of tetragonal structure were fabricated by citrate method,the two patterns of carbon nanotubes(CNT)were made by chemical vapour deposition technique.XRD method was emploied to analyse the crystal structure of the catalysts and the catalyst precur-sors,TEM,pore surface area analyzer were used to analyse the morphology and pore structure of CNT, the two forms of CNT were respectively assembled to supercapacitors,then tested the electrochemical energy storage performance.The results showed that the LaNiO3 and La2 NiO4 were reduced to two Ni metal nanoparti-cle catalysts with different (111)crystal face parameter at high temperature.And the two Ni metal nanoparticle catalysts could grow CNT.But the obtained CNTs had different yield,morphology and structure,pore struc-ture parameters and electrochemical energy storage performances at the same preparation conditions.The re-search results could be obtained as the following:there was a direct relationship between the CNT catalyst and CNT yield,morphology structure,pore structure parameters.There was a direct relationship between the CNT electrochemical energy storage performances and CNT morphology,pore structure parameters.