Manganese(III) Porphyrin as Electrocatalyst for Hydrogen Evolution Reaction
5,10,15,20-tetraphenyl-21H,23H-porphine manganese(III) chloride (Mn(TPP)Cl) has been evaluated as electrocatalyst for Hydrogen Evolution Reaction (HER) in the presence of triethylamine hydrochloride (Et3NHCl) as source of proton. The direct reduction of Et3NHCl on vitreous carbon electrode occurs at Ep -1.6 V vs Ag/AgCl in [Bu4N][BF4]-CH3CN. Interestingly, in the presence of Mn(TPP)Cl as electrocatalyst the reduction potential shifts to -1.20 V. Based on gas chromatography analysis, the formation of H2 gas, with a current efficiency of ca. 58% after 2 h, is observed with a yield of 8 μmoles and a turnover of 2.5. However, the chemical yield at carbon electrode was about 35%. These results reflect the exquisite electrocatalytic efficiency of Mn(TPP)Cl in Hydrogen Evolution Reaction (HER).
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