【摘要】 制备了一种H2Pc-Pt/C纳米复合物催化剂,采用TEM,XRD和ICP对其组成与结构进行了表征.研究结果表明,在含有0.5 mol/L甲醇的硫酸溶液中,H2Pc-Pt/C-Nafion催化电极催化氧还原反应的起始电位比由商品化Pt/C-JM与Nafion制备的Pt/C-JM-Nafion催化电极提高了200 mV,其催化氧还原反应的比活性是Pt/C-JM-Nafion催化电极的7倍,表明其具有优良的耐醇性和对氧还原反应的高催化活性及良好的选择性.与FePc不同,H2Pc和Nafion在乙醇中不能形成可溶性配合物,H2Pc-Pt/C-Nafion催化电极的耐醇性主要由H2Pc微晶的覆盖作用和H2Pc微晶/Pt边界上活性位点对氧还原反应的高催化活性及良好的选择性所致.更多还原

【Abstract】 A H2Pc-Pt/C nanocomposite catalyst was prepared and characterized by TEM,XRD and ICP.In an O2-saturated H2SO4 solution containing methanol(0.5 mol/L),the onset potential over the H2Pc-Pt/C-Nafion electrode shifted by more than 200 mV toward positive relative to that over an electrode prepared with a commercial Pt/C-JM catalyst and Nafion(Pt/C-JM-Nafion),and the specific current density at 0.85 V of the H2Pc-Pt/C-Nafion electrode for oxygen reduction reaction(ORR) is about 7 times larger than that of the Pt/C-JM-Nafion electrode.Different from FePc,H2Pc does not form ethanol soluble complex with Nafion.The excellent methanol tolerance of H2Pc-Pt/C-Nafion is mainly derived from the presence of high active and selective catalytic sites for ORR in the catalytic electrode.更多还原