Multiwalled carbon nanotubes (MWNTs) were used as the conductive additive in the electrode materials. The electrochemical properties of supercapacitors based on LiNi0.8Co0.2O2 / MWNTs composite and LiNi0.8Co0.2O2/acet...Multiwalled carbon nanotubes (MWNTs) were used as the conductive additive in the electrode materials. The electrochemical properties of supercapacitors based on LiNi0.8Co0.2O2 / MWNTs composite and LiNi0.8Co0.2O2/acetylene black composite and MWNTs in 1.0 mol·L-1 LiClO4 / EC+DEC [V(EC)∶V(DEC)=1∶1] electrolyte were investigated by means of constant charge/discharge current tests, respectively. The experimental results show that the LiNi0.8Co0.2O2 / MWNTs composite has better performance than that of others, and the maximum specific capacitance of the supercapacitor can reach 271.6 F·g-1, while the energy density is up to 339.5 Wh·kg-1. Furthermore, it is remarkable that the performance of MWNTs is better than that of acetylene black as the conductive additive.展开更多
以多壁碳纳米管(MWCNTs)为固相萃取材料,建立了蔬菜中苯醚甲环唑农药残留的气相色谱-质谱联用(GC-MS)分析方法。样品经乙酸乙酯匀浆提取后,以MWCNTs固相萃取柱净化,用GC-MS进行检测。研究了不同提取溶剂和MWCNTs的量对提取净化效率的影...以多壁碳纳米管(MWCNTs)为固相萃取材料,建立了蔬菜中苯醚甲环唑农药残留的气相色谱-质谱联用(GC-MS)分析方法。样品经乙酸乙酯匀浆提取后,以MWCNTs固相萃取柱净化,用GC-MS进行检测。研究了不同提取溶剂和MWCNTs的量对提取净化效率的影响。结果表明:在最优实验条件下,苯醚甲环唑在0.005~2.0μg/m L范围内呈良好的线性关系,相关系数为0.9997,检出限为0.001 mg/kg,空白蔬菜样品在0.01、0.10、1.00μg/m L 3个加标水平下的回收率在84.2%~111.3%之间,相对标准偏差(n=5)为5.3%~11.9%。该方法灵敏度高,选择性好,抗干扰能力强,适合蔬菜中苯醚甲环唑残留量的定性确证分析和定量分析。展开更多
文摘Multiwalled carbon nanotubes (MWNTs) were used as the conductive additive in the electrode materials. The electrochemical properties of supercapacitors based on LiNi0.8Co0.2O2 / MWNTs composite and LiNi0.8Co0.2O2/acetylene black composite and MWNTs in 1.0 mol·L-1 LiClO4 / EC+DEC [V(EC)∶V(DEC)=1∶1] electrolyte were investigated by means of constant charge/discharge current tests, respectively. The experimental results show that the LiNi0.8Co0.2O2 / MWNTs composite has better performance than that of others, and the maximum specific capacitance of the supercapacitor can reach 271.6 F·g-1, while the energy density is up to 339.5 Wh·kg-1. Furthermore, it is remarkable that the performance of MWNTs is better than that of acetylene black as the conductive additive.
文摘以多壁碳纳米管(MWCNTs)为固相萃取材料,建立了蔬菜中苯醚甲环唑农药残留的气相色谱-质谱联用(GC-MS)分析方法。样品经乙酸乙酯匀浆提取后,以MWCNTs固相萃取柱净化,用GC-MS进行检测。研究了不同提取溶剂和MWCNTs的量对提取净化效率的影响。结果表明:在最优实验条件下,苯醚甲环唑在0.005~2.0μg/m L范围内呈良好的线性关系,相关系数为0.9997,检出限为0.001 mg/kg,空白蔬菜样品在0.01、0.10、1.00μg/m L 3个加标水平下的回收率在84.2%~111.3%之间,相对标准偏差(n=5)为5.3%~11.9%。该方法灵敏度高,选择性好,抗干扰能力强,适合蔬菜中苯醚甲环唑残留量的定性确证分析和定量分析。
