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建立了适合于研究粉末催化剂电极过程的软嵌式超薄电极技术,并研究了在经热处理的四对甲氧基苯基卟啉钴/光谱纯石墨粉表面上氧的还原反应,特别是溶液pH值和阴离子的影响。实验结果表明,该催化剂能在广泛pH范围内适用,主要催化二电子反应,随pH值增大,发生氧还原反应的电位负移,但电极反应的可逆性增大,同时阴离子的阻化效应减小。讨论了催化剂上氧还原反应的机理。在具有不同pH值的溶液中,反应机理不尽相同,但控制步骤一般都是第一个电子的转移步骤。根据所假设的机理,较好地解释了所得的实验结果。
A soft-embedded ultrathin electrode technology suitable for studying the process of powder catalyst electrode was established and the reduction reaction of oxygen on the surface of the heat treated tetrakis (p-methoxyphenyl) porphyrin / pure graphite powder was studied. Effect of pH and Anions. The experimental results show that the catalyst can be applied in a wide range of pH and mainly catalyze the two-electron reaction. With the increase of pH, the potential of the oxygen reduction reaction shifts negatively, but the reversibility of the electrode reaction increases. Meanwhile, Decrease The mechanism of the oxygen reduction reaction on the catalyst is discussed. In solutions with different pH values, the reaction mechanism varies but the control steps are generally the first electron transfer step. Based on the hypothetical mechanism, the experimental results obtained are well explained.