Green and short preparation of CeO₂ nanoparticles with large specific surface area from rare earth extraction (CeCl₃) was successfully achieved by spray pyrolysis (SP). In this method, a precursor solution is first prepared by mixing CeCl₃, C₆H₈O, and H₂O in the requisite quantities. Subsequently, the precursor consisting of a mixture of CeO₂ and C was obtained by SP method by using the precursor solution. Finally, the calcination at 500 °C~800 °C in air for two hours to transform the precursor to CeO₂ nanoparticles. Thermodynamic analysis and experimental studies were performed to determine the optimal SP temperature and citric acid amount. The results indicated that the maximum specific surface area (59.72 m²/g) of CeO₂ nanoparticles were obtained when the SP temperature was 650 °C and the molar ratio of citric acid to CeCl₃ was 1.5.

Rare earth is an important strategic resource in China, and it has the reputation of “industrial vitamin” in the industrial field. Rare earth is non-renewable. Due to the diverse preparation methods of rare earth oxides, different preparation methods have their own advantages and disadvantages. Using different methods to prepare nano-rare earth oxides. And because of the special electronic structure of rare earth elements, it has special optical, electrical and magnetic properties. This article mainly introduces the use of nano-rare earth oxides in luminescence, permanent magnetism, ceramics, catalysis and so on.

The ninth meeting of the Central Finance and Economics Commission pointed out that “achieving carbon peaking and carbon neutrality is a broad and profound economic and social systemic change”. Under the dual carbon goal, the deep decarbonization of the energy system is imperative. This paper analyzes the policy under the dual carbon goal and focuses on the current physical and chemical energy storage methods. The most fundamental way to realize the dual carbon goals as soon as possible and reduce carbon dioxide emissions so as to gradually replace coal and other fossil energy sources is to develop renewable energy.