钴卟啉的合成及其对氧还原的电催化性能

Synthesis of Cobalt Tetraphenylporphyrin and Its Electrocatalytic Performance for Oxygen Reduction

合成了四苯基卟啉及其钴配合物,考察了催化剂、溶剂及反应温度等因素对四苯基卟啉收率的影响,并用红外光谱和核磁共振氢谱对合成产物进行了结构表征.以X射线光电子能谱为主要手段,研究了不同热处理温度对钴卟啉结构的影响,通过测定空气电极极化曲线研究了热处理对钴卟啉催化活性的影响.结果表明,在200℃,以对硝基苯甲酸为催化剂,硝基苯为溶剂时,四苯基卟啉收率达32%.热处理能提高金属卟啉的催化活性,600℃热处理后,钴卟啉环中的Co-N4结构趋于键断裂的临界状态,催化活性点增多,催化活性较好;而800℃处理的钴卟啉中部分Co-N4键破裂,催化活性下降.

Tetraphenylporphyrin and its cobalt complex were synthesized under different conditions and characterized by infrared spectroscopy and ^1H nuclear magnetic resonance. The influences of catalyst, solvent, and temperature on the yield of tetraphenylporphyrin were investigated. The effect of heat treatment on structure of cobalt tetraphenylporphyrin at different temperatures was investigated using X-ray photoelectron spectroscopy. Cathodic polarization curves of air electrode loaded with cobalt tetraphenylporphyrin were measured to evaluate the performance of heat-treated catalysts. The results showed that using p-nitrobenzoic acid as catalyst and nitrobenzene as solvent, the yield of tetraphenylporphyrin was about 32% at 200℃. The moiety Co-N4 of cobalt tetraphenylporphyrin was in a critical state under 600℃ heat treatment but was destroyed partly at 800 ℃. Thus the catalytic activity of cobalt tetraphenylporphyrin heat-treated at 600℃ was higher than that heat-treated at 800 ℃.