Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2016, Vol. 27 ›› Issue (5): 108 doi: 10.1007/s41365-016-0122-6

• NUCLEAR PHYSICS AND INTERDISCIPLINARY RESEARCH • Previous Articles     Next Articles

ALD-coated ultrathin Al2O3 film on BiVO4 nanoparticles for efficient PEC water splitting

Guo-Liang Chang 1,2 ,  De-Gao Wang 2 , Yu-Ying Zhang 2 , Ali Aldalbahi , Li-Hua Wang 2 , Qian Li 2 , Kun Wang 2   

  1. 1 Department of Physics, College of Sciences, Shanghai University, Shanghai 200444, China
    2 Division of Physical Biology and Bioimaging Center, Shanghai Synchrotron Radiation Facility, CAS Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
    3 Chemistry Department, King Saud University, Riyadh 11451, Saudi Arabia
  • Contact: Kun Wang E-mail:nanowangkun@sinap.ac.cn
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21473236, 21227804), the Shanghai Municipal Commission for Science and Technology (13NM1402300) and the Chinese Academy of Sciences. Ali Aldalbahi acknowledges the support by the Deanship of Scientific Research, College of Science Research Center at King Saud University.

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Guo-Liang Chang, De-Gao Wang, Yu-Ying Zhang, Ali Aldalbahi, Li-Hua Wang, Qian Li, Kun Wang. ALD-coated ultrathin Al2O3 film on BiVO4 nanoparticles for efficient PEC water splitting.Nuclear Science and Techniques, 2016, 27(5): 108     doi: 10.1007/s41365-016-0122-6

Abstract:

Bismuth vanadate (BiVO4) is a promising semiconductor material for solar energy conversion via photoelectrochemical (PEC) water splitting, whereas its performance is limited by surface recombination due to trapping states. Herein, we developed a new method to passivate the trapping states on BiVO4 surface using ultrathin aluminum oxide (Al2O3) overlayer by atomic layer deposition. The coated ultrathin Al2O3 film on BiVO4 significantly enhanced photocurrent densities of the BiVO4 anodes under standard illumination of AM 1.5 G (100 mW/cm2). The electrochemical impedances and photoluminescence spectra were studied to confirm that the improved PEC water splitting performance of BiVO4 was due to the decreased surface recombination state on BiVO4, which effectively enhanced the charge separation.

Key words: Ultrathin Al2O3 overlayer, Photoelectrochemical water splitting, Surface state, Atomic layer deposition