BiFeO3-Based All Perovskite Oxides Direct Z-Scheme Heterostructure for Efficient Oxygen Evolution
ACS APPLIED ENERGY MATERIALS(2023)
摘要
BiFeO3 (BFO) has gained significant attentionrecentlyin photocatalytic water splitting due to its visible light activeprofile and facile synthesis design. However, a single component photocatalystusually suffers from significant photoexcited charge-carrier recombination.To overcome this problem, BFO nanocuboids are coupled with two-dimensionalCa(2)Nb(3)O(10) (CNO) nanosheets via afacile electrostatic self-assembly method. The surface charge of BFOnanocuboids is modulated via deposition of Co-nanoparticles to obtainedpositively charged BFO-Co nanocuboids. Resultantly, the combinationof positively charged BFO-Co nanocuboids and negative charged CNOnanosheets demonstrated a direct Z-scheme heterojunction. The optimizedBFO-Co/CNO heterostructure achieved outstanding photocatalytic O-2 evolution (48.19 mmol g(-1)), which is 6.72times higher than pristine BFO (7.17 mmol h(-1) g(-1)). Different characterization confirmed that BFO-Co/CNOheterostructures exhibited improved charge-carrier separation andutilization compared to individual components. This improved responsecan be associated with a better contact interface between the oppositelycharged surfaces with the added advantage of the perovskite natureof both components. As a result, BFO-Co/CNO heterostructures achievedthe highest O-2 evolution response for BFO-based heterostructuresto date. This study offers a novel strategy for modulating the BFOnanocuboids surface charge via Co-nanoparticles deposition, whichconcomitantly worked as a cocatalyst, a potential strategy that canbe applied for the design of various heterostructures.
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关键词
BiFeO3, heterojunction, direct Z-scheme, electrostaticassembly, O-2 evolution
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