Bi-functional ferroelectric BiFeO3 passivated BiVO4 photoanode for efficient and stable solar water oxidation
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]
유료 다운로드의 경우 해당 사이트의 정책에 따라 신규 회원가입, 로그인, 유료 구매 등이 필요할 수 있습니다. 해당 사이트에서 발생하는 귀하의 모든 정보활동은 NDSL의 서비스 정책과 무관합니다.
원문복사신청을 하시면, 일부 해외 인쇄학술지의 경우 외국학술지지원센터(FRIC)에서
무료 원문복사 서비스를 제공합니다.
NDSL에서는 해당 원문을 복사서비스하고 있습니다. 위의 원문복사신청 또는 장바구니 담기를 통하여 원문복사서비스 이용이 가능합니다.
- 이 논문과 함께 출판된 논문 + 더보기