Hydrogen storage in proton-conductive perovskite-type oxides and their application

Abstract

Various mixed oxides having perovskite structure were prepared by co-precipitation and sol-gel methods. The samples were calcined at 700 °C. The produced solids were characterized using X-ray diffraction analysis (XRD), thermogravimetry (TGA), differential thermal analysis (DTA), high resolution transmission electron microscope (HRTEM), nitrogen adsorption at −196 °C and hydrogen adsorption isotherms conducted at 100 °C. The results revealed the formation of nanosized mixed solids, namely LaNiO3, LaFeO3, LaCoO3, LaCu2O4 and LaCrO3 compounds with crystallite size within 27–37 nm. The hysteresis loop of nitrogen adsorption isotherms of different investigated adsorbents indicate clearly the porous nature of different solids calcined at 700 °C. The most active candidate towards hydrogen uptake is LaNiO3 prepared via sol-gel technique. Its adsorption capacity measured at 100 °C and 20 bar hydrogen pressure attained 1.7 wt%. So, LaNiO3 prepared via sol-gel technique could be considered as very promising material for hydrogen storage.