期刊
CHEMICAL ENGINEERING JOURNAL
卷 476, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2023.146575
关键词
Cobalt porphyrin; Benzoyloxy; Oxygen reduction reactions; Electrocatalysis; Interfacial charge transfer
Three novel triphenylamine cobalt porphyrins were designed and tested for their efficacy in electrocatalytic oxygen reduction reactions. The benzoyloxy substitute showed the best performance among the catalysts and may provide an applicable protocol for engineering efficient metalloporphyrins as electrocatalysts.
Three novel triphenylamine (TPA) cobalt porphyrins Ph-TPACoP, FP-TPACoP and BA-TPACoP are designed to explore their efficacy in electrocatalytic oxygen reduction reactions (ORRs). The porphyrins are coated on carbon nanotubes and carbon black to construct composites for ORRs in alkaline and acidic media. The BA-TPACoPbased composites, on either carbon support and in either electrolyte, exhibit the best ORR performance among the catalysts under the same conditions. Remarkably, BA-TPACoP/CNT attains comparable reduction potentials and response current densities to Pt/C in alkali, and it also exhibits an electron transfer number of 3.94 in acid, reaching close to the 4-electron oxygen reduction. This work demonstrates the efficacy of benzoyloxy substitutes for the ORR improvement and may provide an applicable protocol for engineering efficient metalloporphyrins as electrocatalysts.
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