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Nano energy v.31, 2017년, pp.28 - 36   SCIE
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Bi-functional ferroelectric BiFeO3 passivated BiVO4 photoanode for efficient and stable solar water oxidation

Xie, Jiale (Faculty of Materials and Energy, Southwest University, Chongqing 400715, PR China ) ; Guo, Chunxian (Institute of Materials Science and Devices, Suzhou University of Science and Technology, Suzhou 215011, PR China ) ; Yang, Pingping (Faculty of Materials and Energy, Southwest University, Chongqing 400715, PR China ) ; Wang, Xiaodeng (Faculty of Materials and Energy, Southwest University, Chongqing 400715, PR China ) ; Liu, Dingyu (Faculty of Materials and Energy, Southwest University, Chongqing 400715, PR China ) ; Li, Chang Ming (Faculty of Materials and Energy, Southwest University, Chongqing 400715, PR China ) ;
  • 초록  

    Abstract Photoelectrochemical (PEC) devices have become one of the most attractive clean energies due to its potential high efficiency and simplicity but it is very challenging to make a highly efficient and stable practical device. Up to date, BiVO 4 as the most promising ternary metal-oxide photoanode can only achieve a photocurrent of no more than 1.0mAcm −2 , which is far below its theoretical value (7.5mAcm −2 ), and is mainly caused by its high charge recombination from defects and sluggish water oxidation kinetics. Herein we fabricate a BiVO 4 /ferroelectric BiFeO 3 composite photoanode by a surface passivation approach to greatly enhance photocurrent by ~4.4 times plus ~400mV negative shift of the onset potential than the plain BiVO 4 . BiVO 4 /BiFeO 3 also greatly decreases charge recombination rate from 17s −1 to 0.6s −1 in comparison to the plain BiVO 4 by ~28 times. The PEC performance of BiVO 4 /BiFeO 3 can also be manipulated based on the direction of self-polarization in BiFeO 3 . Moreover, BiVO 4 /BiFeO 3 shows much better stability than that of the BiVO 4 as well as BiVO 4 /Co-Pi. It is discovered that the PEC performance enhancement mechanism is attributed to the BiFeO 3 passivation for a bifunctional film as a buffer layer to significantly reduce charge recombination while as an efficient catalyst to boost charge separation/transfer. Highlights Ferroelectric BiFeO 3 as passivation layer and catalyst is used to modify BiVO 4 . BiFeO 3 can suppress the charge recombination and improve the charge separation. BiVO 4 /BiFeO 3 shows greatly higher current and negative shift for the onset potential. BiFeO 3 modified electrode also shows better stability than that of Co-Pi modified. Graphical abstract [DISPLAY OMISSION]


  • 주제어

    Solar water oxidation .   Ferroelectric material .   Self-polarization .   Bi-function .   Passivation.  

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