Effect of pyrolysis temperature on cobalt phthalocyanine supported on carbon nanotubes for oxygen reduction reaction
Effect of pyrolysis temperature on cobalt phthalocyanine supported on carbon nanotubes for oxygen reduction reaction
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DOI：
10.1007/s10800-012-0481-6
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发表时间：
2012-09
影响因子：
2.9
通讯作者：
L. Ramavathu;K. K. Maniam-K.;Keerthiga Gopalram;R. Chetty
中科院分区：
文献类型：
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作者：
L. Ramavathu;K. K. Maniam-K.;Keerthiga Gopalram;R. Chetty
采用酞菁钴（CoPc）浸渍功能化多壁碳纳米管（CNTs）作为氧还原反应（ORR）的非贵重电催化剂。在450 ~ 850℃范围内对电催化剂进行热处理，考察热解温度对ORR电催化活性的影响及其关系。采用热重分析、x射线衍射和电子显微镜对催化剂的热稳定性、晶体结构和形貌进行了研究。循环伏安法和旋转圆盘电极结果表明，在550℃热解的CoPc/CNTs对ORR的电催化活性最高，随着热解温度的进一步升高，催化活性降低。x射线光电子能谱显示，温度高于550℃时，官能团减少，与催化活性下降有关。结果表明，酸氧化引入的氧官能团在碳纳米管上锚定CoPc在电催化活性中起主要作用。
Cobalt phthalocyanine (CoPc)-impregnated functionalized multi-walled carbon nanotubes (CNTs) were used as nonprecious electrocatalysts for oxygen reduction reaction (ORR). The electrocatalysts were thermally treated at temperatures ranging from 450 to 850 °C, and the effect of pyrolysis temperature and their relationship to the electrocatalytic activity for ORR were investigated. Thermo gravimetric analysis, X-ray diffraction, and electron microscopy were used to study the thermal stability, crystal structure, and morphology of these catalysts. Cyclic voltammetry and rotating disk electrode results showed that CoPc/CNTs pyrolyzed at a temperature of 550 °C had the highest electrocatalytic activity for ORR, and the catalytic activity decreased with further increase in pyrolysis temperature. X-ray photoelectron spectroscopy showed decrease in functional groups at a temperature higher than 550 °C, correlating with the decreased catalytic activity. The result suggests that oxygen functional groups introduced by acid oxidation for anchoring the CoPc on CNT plays a major role in determining the electrocatalytic activity.