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• W3134995556 endingPage "138107" @default.
• W3134995556 startingPage "138107" @default.
• W3134995556 abstract "The rational design of a highly reactive electronic structure as the active sites is crucial for the development of oxygen reduction reaction (ORR) catalysts. Herein, a unique ethynyl-linked sulfur-containing porphyrin organic polymer (S-POP) is firstly developed as a metal-free catalyst for ORR under acidic conditions, which possess intrinsic porous structures and easily accessible active sites for the adsorption of oxygen. The S-POP exhibits a superior ORR performance with onset potential of 0.82 V and half-wave potential of 0.72 V, achieving one of the best results among metal-free polymer-based ORR catalysts in acidic conditions, the high ORR activity of S-POP is attributed to the exposure of active sites under the test environment. In particular, it is discovered that after replacing pyrrole N by S atoms, the remaining aza N in S-POP exhibit higher ORR activity than those in conventional porphyrin organic polymer (POP). Density functional theory calculations shows that the significant improvement of S-POP over POP is from the redistribution and reduction of the density of charges on aza N, which promotes *O desorb process and decreases the overpotential. This work provides a novel guidance towards designing and modifying metal-free ORR electrocatalysts with a clear electronic structure as the active sites." @default.
• W3134995556 created "2021-03-15" @default.
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• W3134995556 date "2021-05-01" @default.
• W3134995556 modified "2023-10-03" @default.
• W3134995556 title "Novel heteroatom sulfur porphyrin organic polymer as a metal-free electrocatalyst for acidic oxygen reduction reaction" @default.
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• W3134995556 doi "https://doi.org/10.1016/j.electacta.2021.138107" @default.
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