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Catalytic reduction of proton, oxygen and carbon dioxide with cobalt macrocyclic complexes

Title
Catalytic reduction of proton, oxygen and carbon dioxide with cobalt macrocyclic complexes
Authors
Mase, KentaroAoi, ShokoOhkubo, KeiFukuzumi, Shunichi
Ewha Authors
Shunichi Fukuzumi
SCOPUS Author ID
Shunichi Fukuzumiscopus
Issue Date
2016
Journal Title
JOURNAL OF PORPHYRINS AND PHTHALOCYANINES
ISSN
1088-4246JCR Link1099-1409JCR Link
Citation
vol. 20, no. 42958.0, pp. 935 - 949
Keywords
oxygen reductionproton reductioncarbon dioxide reductionproton-coupled electron-transfer catalysiscobalt complexesphotocatalytic reaction
Publisher
WORLD SCI PUBL CO INC
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
The conversion of solar energy into chemical energy by the reduction of small molecules provides a promising solution for the effective energy storage and transport. In this manuscript, we have highlighted our recent researches on the catalysis of cobalt-macrocycle complexes for the reduction of O-2, proton and CO2. We have successfully clarified the reaction mechanisms of catalytic O-2 reduction with cobalt phthalocyanine (Co-II(Pc)) and cobalt chlorin (Co-II(Ch)) based on detailed kinetic study under homogeneous conditions. The presence of proton-accepting moieties on these macrocyclic ligands enhances the electron-accepting ability, leading to the efficient catalytic two-electron reduction of O-2 to produce hydrogen peroxide (H2O2) with high stability and less overpotential in acidic solutions. When Co-II(Ch) is adsorbed on multi-walled carbon nanotubes (MWCNTs) and employed as an electrocatalyst, CO2 was successfully reduced to form CO with a Faradaic efficiency of 89% at an applied potential of -1.1 V vs. NHE in an aqueous solution. Finally, photocatalytic H-2 evolution was attained from ascorbic acid with Co-II(Ch) as a catalyst and [Ru(bpy)(3)](2+) (bpy = 2,2'-bipyridine) as a photocatalyst via a one-photon two-electron process.
DOI
10.1142/S1088424616300111
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자연과학대학 > 화학·나노과학전공 > Journal papers
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