TY - JOUR
T1 - Planar heterojunction boosts solar-driven photocatalytic performance and stability of halide perovskite solar photocatalyst cell
AU - Wang, Chunhua
AU - Huang, Haowei
AU - Weng, Bo
AU - Verhaeghe, Davy
AU - Keshavarz, Masoumeh
AU - Jin, Handong
AU - Liu, Biao
AU - Xie, Haipeng
AU - Ding, Yang
AU - Gao, Yujie
AU - Yuan, Haifeng
AU - Steele, Julian A.
AU - Hofkens, Johan
AU - Roeffaers, Maarten B.J.
N1 - Funding Information:
The authors acknowledge financial support from the Research Foundation – Flanders (FWO grant nos. G.0B39.15 , G.0B49.15 , G098319N , 12Y7221N , 12Y6418N and ZW15_09-GOH6316N ), the KU Leuven Research Fund ( C14/19/079 , iBOF-21-085 PERSIST ), KU Leuven Industrial Research Fund ( C3/19/046 ), the Flemish government through long term structural funding Methusalem ( CASAS2 , Meth/15/04 ), and MPI financial support to J.H. as an MPI fellow. C.W. acknowledges the financial support from the China Scholarship Council.
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2022/2
Y1 - 2022/2
N2 - The excellent optoelectronic properties of metal halide perovskites (MHPs) have been employed in various photocatalytic applications, but their poor water stability is considered as the main bottleneck for further development. Herein, we protect the light-absorbing CsPbBr3 MHP with a NiOx and TiO2 hole and electron extracting layer. This planar NiOx/CsPbBr3/TiO2 architecture can easily be fabricated through solution-processing. When applied to selective photocatalytic oxidation of benzyl alcohol, this system presents a 7-fold enhancement of photoactivity and an improved stability for over 90 h compared to CsPbBr3 counterpart. Interestingly, we find that trace amounts of water improve photoactivity. Through experimental and theoretical analyses, this improvement could be attributed to water-induced structural reorganization of MHP, leading to improved crystal quality and decreased effective masses of charge carriers. This work indicates planar heterojunction helps improve the photoactivity and stability of MHP photocatalyst, and our findings provide insights into the effect of water on MHPs.
AB - The excellent optoelectronic properties of metal halide perovskites (MHPs) have been employed in various photocatalytic applications, but their poor water stability is considered as the main bottleneck for further development. Herein, we protect the light-absorbing CsPbBr3 MHP with a NiOx and TiO2 hole and electron extracting layer. This planar NiOx/CsPbBr3/TiO2 architecture can easily be fabricated through solution-processing. When applied to selective photocatalytic oxidation of benzyl alcohol, this system presents a 7-fold enhancement of photoactivity and an improved stability for over 90 h compared to CsPbBr3 counterpart. Interestingly, we find that trace amounts of water improve photoactivity. Through experimental and theoretical analyses, this improvement could be attributed to water-induced structural reorganization of MHP, leading to improved crystal quality and decreased effective masses of charge carriers. This work indicates planar heterojunction helps improve the photoactivity and stability of MHP photocatalyst, and our findings provide insights into the effect of water on MHPs.
KW - Metal halide perovskites
KW - Planar heterojunction
KW - Solar photocatalyst cell
KW - Stability
UR - http://www.scopus.com/inward/record.url?scp=85116515614&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2021.120760
DO - 10.1016/j.apcatb.2021.120760
M3 - Article
AN - SCOPUS:85116515614
SN - 0926-3373
VL - 301
JO - Applied Catalysis. B: Environmental
JF - Applied Catalysis. B: Environmental
M1 - 120760
ER -
