首页|Piezoelectric-enhanced n-TiO2/BaTiO3/p-TiC2 heterojunction for highly efficient photoelectrocatalysis

Piezoelectric-enhanced n-TiO2/BaTiO3/p-TiC2 heterojunction for highly efficient photoelectrocatalysis

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Charge separation is critical for achieving efficient solar-to-hydrogen conversion,whereas piezoelectric-enhanced photoelectrochemical(PEC)systems can effectively modulate band bending and charge migration.Herein,we design an n-TiO2/BaTiO3/p-TiO2(TBTm)hetero-junction in which the piezoelectric BaTiO3 layer is sandwiched between n-TiO2 and p-TiO2.The built-in electric field of TBTm can provide a strong driving force to accelerate carrier separation and prolong carrier lifetime.Consequently,the TBT3 achieves a prominent photocurrent density,as high as 2.13 mA cm-2 at 1.23 V versus reversible hydrogen electrode(RHE),which is 2.4-and 1.5-times higher than TiO2 and TiO2-BaTiO3 heterojunction,respectively.Driven by mechanical deformation,the induced dipole polarization can further regulate built-in electric fields,and the piezoelectric photocurrent density of TBT3-800 is 2.84 times higher than TiO2 at 1.23 V vs.RHE due to the construction of piezoelectric-heterostructures.This work provides a piezoelectric polarization strategy for modulating the built-in electric field of heterojunction for PEC system.

PhotoelectrochemicalPiezoelectric polarizationHeterojunctionCharge separation

Minhua Ai、Zihang Peng、Xidi Li、Faryal Idrees、Xiangwen Zhang、Ji-Jun Zou、Lun Pan

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Key Laboratory for Green Chemical Technology of the Ministry of Education,School of Chemical Engineering and Technology,Tianjin University,Tianjin,300072,China

Collaborative Innovative Center of Chemical Science and Engineering(Tianjin),Tianjin,300072,China

Haihe Laboratory of Sustainable Chemical Transformations,Tianjin,300192,China

Department of Physics,University of the Punjab,Quaid-e-Azam Campus,Lahore,54590,Pakistan

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaJoint Research Programs of National Natural Science Foundation of China and Pakistan Science FoundationHaihe Laboratory of Sustainable Chemical Transformations

222228082197820022161142002PSF-NSFC-IV/Phy/P-PU31

2024

10.1016/j.gee.2023.12.001

绿色能源与环境(英文)

绿色能源与环境(英文)

CSTPCD
ISSN：
年,卷(期)：2024.9(9)