resumo
The synthesis of macroporous perovskite La0.65Sr0.3CoO3-delta and spinel NiCo2O4 electrodes was achieved by infiltration of La0.65Sr0.3CoO3-delta and NiCo2O4 colloid solutions inside a polymer gel template followed by calcination at 1100 degrees C to obtain single-phase materials. Resulting inorganic materials are porous and have a high specific surface area up to 90 m(2) g(-1), average pore diameter similar to 450 nm, and 20-50 nm particle size. The structure of inorganic networks shows obvious similarities to the initial polymer gel network. Porous NiCo2O4 spinel can also be obtained from a precursor salt solution, whereas La0.65Sr0.3CoO3-delta perovskite formed after template impregnation from a precursor salt solution has a dense structure with a low specific surface area. Macroporous inorganic networks exhibit high electrocatalytic activity toward oxygen evolution from alkaline water solutions with the efficiency substantially better than that of the film electrodes having a similar composition. The highest activity was observed for the La0.65Sr0.3CoO3-delta perovskite network.
palavras-chave
PHOTOCATALYTIC PROPERTIES; NANOPARTICLE INFILTRATION; MESOPOROUS SILICA; OXYGEN EVOLUTION; CATALYST; TITANIA; ELECTROCATALYSIS; NANOSTRUCTURES; PEROVSKITES; PRECURSORS
categoria
Chemistry; Materials Science
autores
Shchukin, DG; Yaremchenko, AA; Ferreira, MGS; Kharton, VV
nossos autores
Aleksey Yaremchenko
Investigador Principal
Mário Guerreiro Silva Ferreira
Professor(a) Jubilado(a)