Abstract
Sheet-like precursors of Co3O4 and Ag/Co3O4 composites with different Ag contents were synthesized with assistance of triethylamine via a hydrothermal process. The final samples were fabricated by calcing each precursor at 400 °C. The as-prepared samples were identified and characterized by thermogravimetric analysis and differential thermal analysis, X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, and field emission scanning electron microscopy, respectively. The Co3O4 and Ag/Co3O4 composite samples were used as electrocatalysts modified on a glassy carbon electrode for p-nitrophenol reduction in a basic solution. The electrocatalytic results indicated that all the samples showed enhanced electrocatalytic performance for p-nitrophenol by comparing a bare glass carbon electrode, and p-nitrophenol could be reduced by Co3O4 at a high peak current but a rather higher peak potential but be reduced effectively by Ag/Co3O4 composites at lower potential. Ag/Co3O4 composites with 4 % Ag displayed the highest electrocatalytic activity.
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