Acta Phys. -Chim. Sin. ›› 2017, Vol. 33 ›› Issue (10): 2064-2071.doi: 10.3866/PKU.WHXB201705103

• ARTICLE • Previous Articles     Next Articles

Effect of Preparation Methods on Photo-Induced Formation of Peroxide Species on Nd2O3

Qian WU,Wei-Zheng WENG*(),Chun-Li LIU,Chuan-Jing HUANG,Wen-Sheng XIA,Hui-Lin WAN*()   

  • Received:2017-02-27 Published:2017-07-17
  • Contact: Wei-Zheng WENG,Hui-Lin WAN E-mail:wzweng@xmu.edu.cn;hlwan@xmu.edu.cn
  • Supported by:
    the National Key Basic Research Program of China (973)(2013CB933102);National Natural Science Foundation of China(21173173);National Natural Science Foundation of China(21473144);Program for Innovative Research Team in University, China(IRT_14R31)

Abstract:

Three Nd2O3 samples with cubic phase being the main component phase, denoted as Nd2O3-H, Nd2O3-HT, and Nd2O3-C, were synthesized by hydrolysis, hydrothermal, and combustion methods, respectively. A comparative study of the photo-induced formation of peroxide species on the three Nd2O3 samples was carried out using Raman spectroscopy with a 325 nm laser as the excitation source. After irradiation with the laser of the Raman spectrometer at room temperature in air, peroxide species was detected in all Nd2O3 samples. However, the rate of peroxide formation over Nd2O3-C was much greater than that over the other two samples. This observation can be explained by the differences in the structure and basicity of the surface lattice oxygen (O2-) species of the samples. As evidenced by the results of O2-and CO2-temperature-programmed desorption (TPD) characterizations, the Nd2O3-C sample contains greater number of surface lattice oxygen (O2-) species with low coordination numbers than the other two samples. Moreover, the basicity of the surface O2- species in Nd2O3-C is stronger than that in the Nd2O3-H and Nd2O3-HT samples. Both these factors are in favor of the reaction of lattice oxygen with molecular oxygen to generate peroxide species under photo irradiation.

Key words: Nd2O3, Preparation method, Photo-induced, Peroxide species, Lattice oxygen

MSC2000: 

  • O647