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Oxygen Reduction Reaction Promoted by Manganese Porphyrins

Journal Article · · ACS Catalysis
Here, the oxygen reduction reaction (ORR) is catalyzed by manganese(II) porphyrins in the presence of Brønsted acids (HAs). Analyses of the catalytic cyclic voltammetric profiles have permitted the ORR mechanism to be constructed and rate constants to be extracted for both the formation of the initial oxygen adduct and the O–O bond cleavage event for a series of HAs. The dependence of the formation rate constant of the oxygen adduct on reactant concentrations reveals a rate law that is first order in Mn porphyrin and oxygen substrate. A second order dependence in HA is observed for unadorned Mn porphyrin platforms whereas with Mn hangman porphyrin, a proton is provided intramolecular to the oxygen adduct and consequently the HA order is reduced to unity. Lastly, the stabilization of the oxygen adduct with an additional hydrogen bond from HA engenders a rate-determining step involving O–O bond cleavage, resulting in the rare instance where the activation of the O–O bond is directly observed
Research Organization:
Harvard Univ., Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division
Grant/Contract Number:
SC0017619
OSTI ID:
1597470
Alternate ID(s):
OSTI ID: 1539513
Journal Information:
ACS Catalysis, Journal Name: ACS Catalysis Journal Issue: 9 Vol. 8; ISSN 2155-5435
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

Electrocatalytic reduction of dioxygen by Mn( iii ) meso -tetra( N -methylpyridinium-4-yl)porphyrin in universal buffer journal January 2019
A new synthesis of porphyrins via a putative trans -manganese( iv )-dihydroxide intermediate journal January 2020
Co( ii )Tetraphenyltetraphenanthroporphyrin@MWCNTs: enhanced π–π interaction for robust electrochemical catalysis journal January 2019
Ultrathin atomic Mn-decorated formamide-converted N-doped carbon for efficient oxygen reduction reaction journal January 2019
Significantly improved electrocatalytic oxygen reduction by an asymmetrical Pacman dinuclear cobalt( ii ) porphyrin–porphyrin dyad journal January 2020
Combining scaling relationships overcomes rate versus overpotential trade-offs in O 2 molecular electrocatalysis journal March 2020

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