ALD-coated ultrathin Al2O3 film on BiVO4 nanoparticles for efficient PEC water splitting |
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| Affiliation: | 1. Department of Physics, College of Sciences, Shanghai University, Shanghai 200444, China;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;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 |
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| Abstract: | Bismuth vanadate(BiVO_4) 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 BiVO_4 surface using ultrathin aluminum oxide(Al_2O_3) overlayer by atomic layer deposition.The coated ultrathin Al_2O_3 film on BiVO_4 significantly enhanced photocurrent densities of the BiVO_4 anodes under standard illumination of AM1.5 G(100 mW/cm2).The electrochemical impedances and photoluminescence spectra were studied to confirm that the improved PEC water splitting performance of BiVO_4 was due to the decreased surface recombination state on BiVO_4,which effectively enhanced the charge separation. |
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| Keywords: | Ultrathin Al2O3 overlayer Photoelectrochemical water splitting Surface state Atomic layer deposition |
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