Synergistic effect between La–Ni bimetallic oxides for the efficient decomposition of hydrogen peroxide

Abstract

La–Ni bimetallic oxides, including LaNiO₃ and La₂NiO₄, were prepared by a facile co-precipitation process, followed by calcination treatment. The formation process of these two La–Ni bimetallic oxides was traced by X-ray diffraction, and the calcination temperature was determined to have a crucial influence on the composition and crystalline structure of the final sample. These as-prepared La–Ni bimetallic oxides were used as catalysts for the decomposition of hydrogen peroxide. Benefiting from the synergistic effect between La and Ni, these La–Ni bimetallic oxides showed superior catalytic ability than the single-components oxides such as La₂O₃, Ni₂O₃, and NiO. Additionally, the La–Ni bimetallic oxides exhibited efficient catalytic activity after reusing them several times, showing a desirable cyclic performance. Moreover, the kinetics of the reaction was investigated. The activation energy of this reaction significantly decreased under the catalysis from the as-prepared La–Ni bimetallic oxides, further confirming the promising catalytic potential of these La–Ni bimetallic oxides.