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通过电化学交流阻抗法研究了3种金属酞菁类大环化合物( FePc,CoPc,FeCoPc2)在碱性溶液中对氧气还原反应(ORR)的电化学催化行为,各电极的交流阻抗Nyquist图谱在高频区和低频区均呈现出2个较明显的半圆和半圆之间(中频区)的压扁的弧形,采用Zsimpwin阻抗谱分析软件对-0.2V(vs.Hg/HgO)... 相似文献
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采用可以控制真空室温度的改进型直流电弧炉,在氮气和氦气(1∶1)混合气氛下,使用Co-Ni(1∶1wt%)合金催化剂,通过控制温度等工艺条件,在容器内壁生成了大量单壁碳纳米管,尤其在阴极与阳极之间有大量的宏观网状薄膜.通过两步纯化方法:在500℃空气中烘烧30min;再用37%盐酸浸泡72h,用去离子水过滤至中性烘干.经SEM,HRTEM,XRD,Raman观察分析,纯化后其纯度高(>95%)、管径均匀(1.24—1.38nm).实验结果表明:温度强烈影响单壁碳纳米管的产量,不同温度下管子的纯度、产量都有差异,在温度为600℃时,其纯度达到70%,产量为12g/h.
关键词:
单壁碳纳米管
电弧法
温度影响 相似文献
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High-capacity Hydrogen Storage on Novel Sandwich- like Binuclear Compounds: N4-M2-N4 (M - Sc and Ti)
With respect to the first principle calculations, we predicted that two pairs of transition metals (e.g., Sc2 and Ti2) can be interbedded between two tetranitrogen rings to form two sandwich-like binuclear complexes respectively (e.g. N4Sc2N4 and N4Ti2N4). These two complexes can adsorb up to eight and ten hydrogen molecules, corresponding to a gravimetric storage capacity of 7.7 and 9.9 wt%, respectively. These sandwich-type complexes proposed in this work are favorable for reversible adsorption and desorption of hydrogen at ambient conditions. The results are helpful for the development of a new class of high-capacity hydrogen-storage media. 相似文献
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