Electrocatalysis of the reduction of dioxygen by adsorbed cobalt 5,10,15,20-tetraarylporphyrins to which one, two, or three Ru(NH[sub 3])[sub 5][sup 2+] centers are coordinated
Journal Article
·
· Inorganic Chemistry; (United States)
- California Inst. of Technology, Pasadena (United States)
The reactions of Ru(NH[sub 3])[sub 5]OH[sub 2][sup 2+] with the pyridine sites in (5-(4-pyridyl)-10,15,20-triphenylporphyrinato)cobalt(II), (5,10-bis(4-pyridyl)-15,20-diphenylporphyrinato)cobalt(II), (5,10-bis(4-pyridyl)-15,20-bis(4-(trifluoromethyl)phenyl)porphyrinato)cobalt(II), (5,15-bis(4-pyridyl)-10,20-diphenylporphyrinato)cobalt(II), and (5,10,15-tris(4-pyridyl)-20-phenylporphyrinato)cobalt(II) adsorbed on pyrolytic graphite electrodes produce the mono-, di-, and triruthenated complexes. The adsorbed complexes act as catalysts for the reduction of dioxygen. The mono- and diruthenated complexes catalyze the two-electron reduction of dioxygen to hydrogen peroxide, whereas the triruthenated complex catalyzes the four-electron reduction to water. The preparation and electrocatalytic behavior of the catalysts are described. A comparison of the catalysts has provided additional insight into the mechanisms by which they operate in catalyzing the electroreduction of dioxygen. 20 refs., 9 figs., 2 tabs.
- OSTI ID:
- 6043999
- Journal Information:
- Inorganic Chemistry; (United States), Journal Name: Inorganic Chemistry; (United States) Vol. 32:10; ISSN 0020-1669; ISSN INOCAJ
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400* -- Electrochemistry
AMINES
CARBON
CARBOXYLIC ACIDS
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COBALT COMPLEXES
COMPLEXES
ELECTROCATALYSTS
ELECTRODES
ELEMENTAL MINERALS
ELEMENTS
GRAPHITE
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HYDRATES
HYDROGEN COMPOUNDS
HYDROGEN PEROXIDE
MINERALS
NONMETALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN
OXYGEN COMPOUNDS
PEROXIDES
PORPHYRINS
REDUCTION
RUTHENIUM COMPLEXES
SYNTHESIS
TRANSITION ELEMENT COMPLEXES
400400* -- Electrochemistry
AMINES
CARBON
CARBOXYLIC ACIDS
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COBALT COMPLEXES
COMPLEXES
ELECTROCATALYSTS
ELECTRODES
ELEMENTAL MINERALS
ELEMENTS
GRAPHITE
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HYDRATES
HYDROGEN COMPOUNDS
HYDROGEN PEROXIDE
MINERALS
NONMETALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN
OXYGEN COMPOUNDS
PEROXIDES
PORPHYRINS
REDUCTION
RUTHENIUM COMPLEXES
SYNTHESIS
TRANSITION ELEMENT COMPLEXES