碳载钴酞菁催化剂的一步法制备及其在碱性条件下对氧的电催化还原  

One-step Preparation of Carbon Supported Co-phthalocyanine and Its Electrochemical Reduction of Oxygen in Base Medium

作　　者：赵伟利[1] 周德璧[1] 孙新阳[1] 谭龙辉[1] 

机构地区：[1]中南大学化学化工学院,长沙410083

出　　处：《应用化学》2010年第2期183-190,共8页Chinese Journal of Applied Chemistry

摘　　要：通过固相加热,一步合成了以VulcanXC-72(碳黑)为载体的碳载钴酞菁(CoPc/C)复合催化剂,其可用作空气电极的氧还原催化剂。通过X射线衍射、红外光谱等测试技术对催化剂进行了表征。利用极化曲线和交流阻抗(EIS)方法测试了其在碱性介质(6mol/LKOH)中对氧还原的催化性能。结果显示,得到的产物为CoPc/C复合物,平均粒径30nm。以磷酸处理的碳黑为载体,在600℃下制备的CoPc/C复合催化剂表现出最佳的催化活性。以其制备的电极在空气气氛下-0.03V(Hg/HgO)电位时即可产生明显氧还原电流,-0.2V时电流密度达90×10-3A/cm2。A composite electrocatalyst cobalt-phthalocyanine loaded on carbon black VulcanXC-72（CoPc/C） was synthesized in one-step reaction through calcination, which could be used as the catalyst of air electrode. The product was characterized by XRD and IR techniques and shown to be CoPc/C composite with an average particle size of 30 nm. Its activity for oxygen reduction reaction （ORR） was evaluated by polarization curve and impedance spectrum in 6 mol/L KOH solution. With VulcanXC-72 pretreated in HNO3 as the carbon support, the CoPc/C calcinated at 600 ℃ exhibited the best catalytic activity. The polarization plots recorded at the electrode catalyzed with this product displyed an onset for ORR at - 0. 03 V （Hg/HgO）. The current density is 90 × 10^-3 A/cm2 at -0. 2 V in air.

关 键 词：碱性燃料电池(AFC) 钴酞菁(CoPc) 氧还原(ORR) 

分 类 号：O646[理学—物理化学]