Abstract
V-doped Na2TiOSiO4 multiwalled nanotubes (Vx-Na2TiOSiO4 MWNTs) were prepared by an effective hydrothermal process and were characterized by SEM, XRD, FT-IR, Raman, TEM, 51V-ssNMR, 29Si-ssNMR and XPS methods. The results showed that the change of V5+ to V4+ was attributed to the reduction of the electronegative oxygen derived from the dehydration of the absorbed hydroxyl, and in this process, new oxygen vacancies resulting from electronegative oxygen were generated. Different from traditional structures, doped vanadium (V4+) replaced partly the position of titanium (Ti4+), which made Si4+ exist in two chemical coordination environments, Ti–O–Si and V–O–Si. The formation of Vx-Na2TiOSiO4 MWNTs was attributed to a curling process, and the unique morphology makes them have large pore volume and surface area to adsorb hydrogen. It adsorbed 0.388 wt% hydrogen even at the temperature of 77 K and hydrogen pressure of 1 bar, such a result provides a promising strategy for designing practical hydrogen storage materials.
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