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采用电化学法从2,2,6,6 四甲基 4 哌啶酮(简称哌啶酮)合成2,2,6,6 四甲基 4 哌啶醇(简称哌啶醇),反应条件温和、选择性好、易分离;产品经气相色谱-质谱联用仪分析,其中只有哌啶醇及极少量原料哌啶酮。该文选用锌做反应电极,讨论了电量、电流密度、电解质浓度、原料浓度以及电解液中乙醇浓度对哌啶酮转化率的影响。最佳反应条件是:电量1 1F/mol、电流密度300A/m2、c(NaOH)=0 5mol/L、电解液中φ(乙醇)=30%、原料浓度1 0mol/L。在此条件下,哌啶醇的平均产率为95 40%,质量分数99%以上。 相似文献
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Nickel-metal hydride (Ni/MH) batteries are one of promising batteries for electric vehicle applications, but at high temperature the charge efficiency of nickel electrode is very low. In order to improve the high-temperature-efficiency of nickel electrode, spherical nickel hydroxide mixed with various ratios of Lu2O3 was used as active material of pasted nickel electrodes. The results of charge/discharge experiments, cyclic voltammetric measurements and XRD characterizations have shown that after addition of Lu2O3, the oxygen evolution overpotcntial is elevated much, the charge efficiency of nickel electrode at high temperature is greatly improved and the content of β-NiOOH phase increases in charged electrodes. In addition, the mixed ratio of Lu2O3 has different effects on high temperature performances of nickel electrode at different charge/discharge currents, 3.5 % is the optimum mixed ratio, and the action of Lu2O3 on high temperature electrochemical behaviors is more apparent when nickel electrodes are charged at small current than large current. 相似文献
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锂离子蓄电池钒系正极材料的研究进展 总被引:7,自引:1,他引:7
锂离子蓄电池具有很多的优良特性,发展很快并得到了广泛地应用。其中锂离子蓄电池正极材料的研究主要集中在第四周期过渡金属的嵌锂氧化物LiCoO2、LiNiO2、LiCoxNi1-xO2、LiCo1/3Ni1/3Mn1/3O2、LiMnO2、LiMn2O4、LiFePO4上。近年来,钒系正极材料的研究引起了人们的广泛关注。文章对嵌锂钒系化合物LiV3O8,LiNiVO4,Li3V2(PO4)3和LiVPO4F等正极材料的制备方法、结构及电化学性能的研究现状进行了综述。 相似文献
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