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• W4309407291 startingPage "112805" @default.
• W4309407291 abstract "• Asymmetric Co porphyrins are designed as oxygen reduction reaction catalysts. • Electronic structures of Co porphyrins are studied by theoretical calculations. • The use of triphenylamine benefits the oxygen reduction activity and selectivity. • Enhanced response current is attained by asymmetric porphyrin composites. • Asymmetric Co porphyrins facilitate interfacial charge transfer. Asymmetric metalloporphyrins have been rarely investigated in oxygen reduction reaction (ORR), which is probably due to the remaining unclear structural effects on electrocatalytic performance and the low synthetic yields. A remarkable feature of these molecules is their inherent large dipole moments, which can benefit the charge separation and electron density modification. Here we synthesize two asymmetric molecules A-Cb-CoPor and A-TPA-CoPor by substituting one of the meso -positions with carbazole and triphenylamine (TPA) derivatives, respectively, to coat on carbon black as ORR electrocatalysts. Density functional theory calculations suggest the well separation of electron density on the cobalt porphyrins. The electrochemical performances of the composites are performed in acid with comparing to a symmetric Co porphyrin-coated catalyst CoPor1/C. A-TPA-CoPor/C attains better ORR activity and selectivity than A-Cb-CoPor/C due to the structural merits of TPA unit. However, an identical electron transfer number of 3.6 is obtained by A-TPA-CoPor/C and CoPor1/C, which is possibly a trade-off result of the use of TPA from its structural advantage and deleterious electron-donating ability. Impressively, both asymmetric porphyrin-based composites exhibit greater limiting current densities than CoPor1/C, which mainly originates from the reduced charge transfer resistance as suggested by the impedance measurements. Our work demonstrates the promise of the asymmetric molecular approach as a viable strategy for efficient ORR catalysts." @default.
• W4309407291 created "2022-11-27" @default.
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• W4309407291 date "2023-01-01" @default.
• W4309407291 modified "2023-10-11" @default.
• W4309407291 title "Asymmetric cobalt porphyrins for oxygen reduction reactions: Boosted catalytic activity by the use of triphenylamine" @default.
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• W4309407291 doi "https://doi.org/10.1016/j.mcat.2022.112805" @default.
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