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Mn(III) and Fe(III) Porphyrin Complexes as Electrocatalysts for Hydrogen Evolution Reaction: A comparative study

机译:Mn(III)和Fe(III)卟啉配合物作为氢进化反应的电催化剂:比较研究

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In the present work, we carried out comparative studies on electrochemical reduction of proton to molecular hydrogen, i.e. 2H+ + 2e → H2 using meso-tetrakis-(tetraphenyl)porphyrin iron(III) chloride [Fe(TPP)Cl] and meso-tetrakis(phenyl)porphyrin manganese(III) chloride [Mn(TPP)Cl] as electrocatalysts. Acetic acid (CH3COOH) was used as the proton source. Results suggest that the reduction of CH3COOH on the surface of vitreous carbon electrode (Ep = -1.8 V vs. Ag/AgCl in [Bu4N][BF4]-DMF) shifts to lower negative values in the presence of [Fe(TPP)Cl] and [Mn(TPP)Cl] (- 1.6 and -1.3 V, respectively vs. Ag/AgCl). Analysis of peak current values indicated that [Fe(TPP)Cl] was more active (6 x) as compared to [Mn(TPP)Cl]. However, the [Mn(TPP)Cl]-catalyzed reduction process more swiftly (the potential is more positive than +30 mV).
机译:在本作本作中,我们对MetOn-(四苯基)卟啉铁(III)氯化铁(III)氯化物[Fe(TPP)Cl]和Meso-Tetrakis进行了对分子氢的电化学降低的比较研究,即2H + 2E→H2,即2H + + 2E→H2 (苯基)卟啉锰(III)氯化物[Mn(TPP)Cl]作为电催化剂。 使用乙酸(CH 3 COOH)作为质子源。 结果表明,在玻璃体碳电极表面上的CH3COOH(EP = -1.8V与Ag / AgCl在[Bu4N] [BF4] -DMF中)的减少转移到[Fe(TPP)CL的情况下较低的负值 [分别对Ag / AgCl分别的[Mn(TPP)Cl]( - 1.6和-1.3V)。 与[Mn(TPP)CL]相比,峰值电流值的分析表明[Fe(TPP)Cl]更具活性(6×)。 然而,[Mn(TPP)CL] - 催化还原过程更迅速(电位比+30mV更积极)。

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