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Composite electrodes on glassy carbon (GC) having the structure GC/CC(Ox)/PPy, with CC representing carbon cloth, PPy polypyrrole and Ox mixed valence spinel oxide nanoparticles of transition metals Cu1.4Mn1.6O4, exhibit high reactivity and stability towards the oxygen reduction reaction (ORR), when the ORR proceeds electrocatalytically on the oxide particles dispersed throughout the carbon cloth. PPy here is electrochemically polymerized and serves as a protective layer to make the oxide sandwiched between PPy and CC fiber backbone. In oxygen saturated 0.15 M KCl solution, the composite electrodes show a good performance with current density up to 10 mA cm− 2 under gentle stirring. The enhancements of the composite electrodes for ORR result from the oxide nanoparticles dispersed on high-area CC. Optimal oxide loadings were encountered at 3.5 mg cm− 2.

We report here experimental evidence for the formation in the solid state of a new binuclear Fe (III) 2(mu-OMe) 2(HL) 4 complex (H 2L is 2-salicyloylhydrazono-1,3-dithiolane). The isostructural Mn (III) 2(mu-OMe) 2(HL) 4 complex has provided the strongest ferromagnetic interaction value (J approximately 20 cm (-1)) between Mn (III) ions to date. The new iron binuclear compound presented in this study shows antiferromagnetic intramolecular coupling, which agrees with the theoretical study that we previously proposed. During our synthetic work, we also observed an unexpected spontaneous reduction of the new Fe (III)(HL) 2Cl,S complex to the new Fe (II)(H 2L) 2Cl 2 high-spin mononuclear complex. This process has been checked by cyclo-voltammetry as well as pseudosteady voltammetry.

Sowohl im PbO2-Gitter bei der Darstellung eingebautes als auch im Elektrolyten (8 N H2SO4) gegenwartiges Sb2O3 erhohen die Kapazitat des PbO2 bei der elektrochemischen Reduktion, jedoch in unterschiedlichem Grad.