EVALUATION OF THE GRAPHENE OXIDE (GO) ROLE IN THE PHOTOCATALYTIC GENERATION OF HYDROGEN IN BINARY (GO-CdS) AND TERNARY (Pt-GO-CdS) SYSTEMS. Water splitting is a promising process to produce hydrogen from friendly feedstock and solar energy. In this work we have evaluated binary (GO-CdS) and ternary (Pt-GO-CdS) hybrid photocatalysts for hydrogen production assisted by visible light irradiation. Cadmium sulfide and composites with GO were prepared by sonochemical and thermal methods. GO addition took place by different strategies: during the synthesis or by mechanical mixture. A variety of configurations was tested and the best performance in hydrogen production among all materials was the ternary photocatalyst named Pt(GO/CdS TT), whose hydrogen production rate was 651 µmol g cat-1 h-1. Such material was obtained by thermal method with GO addition during the synthesis. Additionally, the XRD and Raman analyses have confirmed the GO photoreduction during photocatalytic hydrogen evolution.

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Estes resultados são utilizados para o cálculo do erro determinante na obtenção da classificação em conformidade com a norma IEC 60904-9. O procedimento e quantidade de pontos para este tipo de análise é definido pela mesma norma, o que, segundo nossos resultados, traria erros na estimativa da classificação nos primeiros procedimentos de calibração. Mediante diversos mapas com quantidade de pontos de medida crescentes de 2 a 1620, observou-se em uma análise de convergência que é necessário aumentar o número de medidas até achar um valor do erro mais próximo ao real.

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