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Molecular electrocatalysis for oxygen reduction by cobalt porphyrins adsorbed at liquid/liquid interfaces
Scopus
Toplam 141 atıf DOI
Molecular electrocatalysis for oxygen reduction at a polarized water/1,2-dichloroethane (DCE) interface was studied, involving aqueous protons, ferrocene (Fc) in DCE and amphiphilic cobalt porphyrin catalysts adsorbed at the interface. The catalyst, (2,8,13,17-tetraethyl-3,7,12,18-tetramethyl-5-p- amino-phenylporphyrin) cobalt(II) (CoAP), functions like conventional cobalt porphyrins, activating O2 via coordination by the formation of a superoxide structure. Furthermore, due to the hydrophilic nature of the aminophenyl group, CoAP has a strong affinity for the water/DCE interface as evidenced by lipophilicity mapping calculations and surface tension measurements, facilitating the protonation of the CoAP-O2 complex and its reduction by ferrocene. The reaction is electrocatalytic as its rate depends on the applied Galvani potential difference between the two phases. © 2010 American Chemical Society.
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Transition metal–incorporated tungsten-based ternary refractory metal selenides (MWSex; M = Fe, Co, Ni, and Mn) as hydrogen evolution catalysts at soft interfaces
Scopus
Havuzumuzda 33 atıf almış
Hydrogen evolution reaction (HER) catalysts including transition metal chalcogenides have been recognized as a class of very promising non-expensive and earth-abundant catalysts. Tremendous investigations on the binary and ternary metal sulfides/selenides have demonstrated extraordinary chemical and physical properties such as good structural stability and adjustable chemical composition. The ternary amorphous refractory metal selenides (MWSex; M = Fe, Co, Ni, Mn) have been synthesized by the hot-injection method. The NiWSex, CoWSex, FeWSex and MnWSex nanostructures have been used as catalysts for the hydrogen evolution at the biphasic systems of water and 1,2-dichloroethane with similar to a biomembrane. The catalytic activity differences of ternary metal selenides have been compared with each other taking into account transition metals which are changed in the order of Fe ≈ Mn ≪ Co < Ni. The catalytic activities of the MWSex have not been changed when adding of Fe and Mn into the tungsten selenide nanostructure, which may be originated from amorphous structures of FeWSex and MnWSex. Ni and Co addition into the tungsten selenide have improved the electrocatalytic HER activity when compared with only WSex.
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Kurumlar (2)
Karamanoğlu Mehmetbey Üniversitesi
Karaman, Turkey
Selçuk Üniversitesi
Selçuklu, Turkey