Defects in cerium oxide, especially oxygen va- cancies, play an essential role in its versatile applications and are efficiently preserved at ambient conditions in a non- equilibrium process. Herein, defective CeO2x w...Defects in cerium oxide, especially oxygen va- cancies, play an essential role in its versatile applications and are efficiently preserved at ambient conditions in a non- equilibrium process. Herein, defective CeO2x with hetero- geneous structure was synthesized by high-energy laser melt- ing, where a large amount of oxygen vacancies and Ce3~ could be introduced, leading to improved visible light absorption, narrowed bandgap and room temperature ferromagnetism. Moreover, this laser melted CeO2x exhibits significantly en- hanced low-temperature oxidation behaviors than the coun- terpart prepared by normal hydrogen-reduction. This unique redox performance could be attributed to the intragranular diffusion at the boundaries of assembled nanocrystallites. This method paves a new way for introducing unique multi-func- tions in oxide ceramics.展开更多
基金supported by the National Natural Science Foundation of China(51272124 and U1605243)
文摘Defects in cerium oxide, especially oxygen va- cancies, play an essential role in its versatile applications and are efficiently preserved at ambient conditions in a non- equilibrium process. Herein, defective CeO2x with hetero- geneous structure was synthesized by high-energy laser melt- ing, where a large amount of oxygen vacancies and Ce3~ could be introduced, leading to improved visible light absorption, narrowed bandgap and room temperature ferromagnetism. Moreover, this laser melted CeO2x exhibits significantly en- hanced low-temperature oxidation behaviors than the coun- terpart prepared by normal hydrogen-reduction. This unique redox performance could be attributed to the intragranular diffusion at the boundaries of assembled nanocrystallites. This method paves a new way for introducing unique multi-func- tions in oxide ceramics.
