Abstract
Theoretical and experimental studies with focuse on hydrogen generation through the hydrolysis of graphene oxide (GO) functionalized with magnesium (GOMg), titanium (GOTi), and niobium (GONb) were performed. Thermogravimetric (TGA) results reveal variable thermal decomposition profiles for the composites, in agreement with the decomposition of the labile oxygenated groups of GO. X-ray photoelectron spectroscopy (XPS) results show variable oxygen content (%) for the composites and the formation of MgO, TiO2, and NbO2 layers on the GO surface. The hydrogen generation studies suggest that the formation of a Mg(OH)2 layer on the GO surface is a critical limiting factor for the hydrolysis of GOMg, whereas TiO2 and NbO2 catalyze the hydrolysis of GONb and GOTi. The hydrogen generation results reveal that GONb produced the highest H2 yield of 2 L in 2 h compared to 1.5 L for GOTi and 1.3 L for GOMg. The results support the claim that the hydrolysis of GO functionalized with niobium and titanium are promising candidates for on-board H2 generation applications.
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