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BULLETIN OF THE CHINESE CERAMIC SOCIETY ›› 2021, Vol. 40 ›› Issue (7): 2380-2387.

• New Functional Materials • Previous Articles     Next Articles

Preparation and Performance of WO3 with Long Visible Light Absorption by One-Step Oxygen Enriched Calcination Method for Water Oxidation

LI Dong1, LI Rui1, WU Fachao2, GAO Caiyun2,3   

  1. 1. School of Material Science and Engineering, North Minzu University, Yinchuan 750021, China;
    2. Chemical Scienceand Engineering College, North Minzu University, Yinchuan 750021, China;
    3. Key Laboratory for Chemical Engineering and Technology, State Ethnic Affairs Commission, North Minzu University, Yinchuan 750021, China
  • Received:2021-01-22 Revised:2021-03-22 Online:2021-07-15 Published:2021-08-04

Abstract: Tungsten trioxide (WO3) only responds to sunlight below 460 nm, which greatly limits its utilization for sunlight. Therefore, the current research is focusing on broadening the spectral response range of WO3. In this paper, nitrogen intercalated WO3 (N2-WO3) with wide spectrum visible light response was prepared by one-step oxygen enriched calcination method using ammonium paratungstate [(NH4)10H2W12O42·xH2O] as precursor. The effects of N2 insertion on the structure and properties of WO3 were investigated by XRD, SEM, EDS, UV-Vis DRS and Raman. The results show that N2 insertion effectively narrows the band gap (2.25 eV) of N2-WO3, which is 0.51 eV less than that of pure WO3 (2.76 eV); the N content has a significant effect on the visible light absorption capacity of N2-WO3, and the N content decreases with the increase of calcination temperature. The measurement results of incident photon current conversion efficiency (IPCE) show that N2-WO3 responds to visible light below 520 nm. The results of photocatalytic oxygen evolution show that the photocatalytic activity of N2-WO3 is better than that of pure WO3.

Key words: oxygen enriched calcination, nitrogen intercalation, tungsten trioxide, photoelectrocatalysis, photocatalysis, nanomaterial

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