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首页> 外文期刊>Electrocatalysis >Inverted Linear Correlation Between the Catalytic Activity of Iron Phthalocyanines and the Formal Potential of the Catalyst in the Electrooxidation of L-Cysteine
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Inverted Linear Correlation Between the Catalytic Activity of Iron Phthalocyanines and the Formal Potential of the Catalyst in the Electrooxidation of L-Cysteine

机译：L-半胱氨酸电氧化过程中酞菁铁的催化活性与催化剂形式电位之间的线性反相关

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摘要

The formal potential of macrocyclic complexes is a reactivity index that can serve to predict their electrocatalytic activity. We have investigated the effect of the Fe(II)/(I) formal potential E°' of several iron phthalocyanines preadsorbed on graphite electrodes on their catalytic activity for the electro-oxidation of L-cysteine. A linear and inverted correlation is observed between the catalytic activity (as log /at constant E) versus the Fe(II)/(I) formal potential of the catalyst, i.e., the activity decreases as the driving force of the catalyst increases. The slope of the correlation is close to -2RT/F and seems to be the falling region of an incomplete volcano plot so the decrease of the activity with increasing E°' can be attributed to a gradual increase in the coverage of L-cysteine molecules adsorbed on the Fe sites with a subsequent decrease in free Fe (II) active sites.
机译：大环配合物的形式势是反应性指数，可以用来预测其电催化活性。我们已经研究了预吸附在石墨电极上的几种铁酞菁的Fe（II）/（I）形式势E°'对L-半胱氨酸电氧化催化活性的影响。在催化活性（以log /恒定E表示）与催化剂的Fe（II）/（I）形式势之间观察到线性和倒置的相关性，即，活性随着催化剂驱动力的增加而降低。相关的斜率接近-2RT / F，似乎是不完整火山图的下降区域，因此，随着E°'的增加，活性的下降可归因于L-半胱氨酸分子的覆盖范围逐渐增加吸附在Fe位点上，随后游离Fe（II）活性位点减少。

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