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Resumo: A ureia, além de estar presente na urina humana, é produzida como fertilizante em indústrias. Dessa forma, grande quantidade desse composto é lançada diariamente em efluentes. A oxidação eletroquímica da ureia é um método promissor para remoção desse composto. Assim, neste trabalho, nanopartículas de Ni suportadas em carbono e CeO2 com diferentes morfologias, foram sintetizadas com o intuito de estudar a influência da presença do CeO2 no processo de eletro-oxidação de ureia. As análises de difração de raios-x (DRX) revelaram a presença das fases Ni° e Ni(OH)2 e confirmaram a presença do CeO2 e do carbono. As imagens de microscopia eletrônica de transmissão (MET) confirmaram nanofios de CeO2 com diâmetros de 15 nm e nanopartículas de Ni com 2 nm de tamanho. A atividade catalítica dos materiais foi investigada por experimentos de voltametria cíclica (VC) e cronoamperometria (CA), nos quais foi mostrado que a presença de céria aumentou a atividade catalítica na reação de oxidação eletroquímica da ureia. Urea, in addition to being present in human urine, is produced as a fertilizer in industries. Thus, a large amount of this compound is discharged daily into effluents. The electrochemical oxidation of urea is a promising method for removing this compound. Thus, in this work, Ni nanoparticles supported on carbon and CeO2 with different morphologies were synthesized in order to study the influence of CeO2 in the urea electro-oxidation process. X-ray diffraction (XRD) analyzes revealed the presence of the Ni° and Ni(OH)2 phases and confirmed the presence of CeO2 and carbon. Transmission electron microscopy (TEM) images confirmed CeO2 nanowires with diameter of 15 nm and Ni nanoparticles with 2 nm in size. The catalytic activity of the materials was investigated by cyclic voltammetry (CV) and chronoamperometry (CA) experiments, in which it was shown that the presence of ceria increased the catalytic activity in the electrochemical oxidation of urea reaction.

Ni/C-CeO2 with Different Morphologies of CeO2 Towards Urea Electro-Oxidation Reaction