Piezoelectric-enhanced n-TiO_(2)/BaTiO_(3)/p-TiO_(2) heterojunction for highly efficient photoelectrocatalysis  

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

机构地区：[1]Key Laboratory for Green Chemical Technology of the Ministry of Education,School of Chemical Engineering and Technology,Tianjin University,Tianjin,300072,China [2]Collaborative Innovative Center of Chemical Science and Engineering(Tianjin),Tianjin,300072,China [3]Department of Physics,University of the Punjab,Quaid-e-Azam Campus,Lahore,54590,Pakistan [4]Haihe Laboratory of Sustainable Chemical Transformations,Tianjin,300192,China

出　　处：《Green Energy & Environment》2024年第9期1466-1476,共11页绿色能源与环境（英文版）

基　　金：the support from the National Natural Science Foundation of China(22222808,21978200,22161142002);the Joint Research Programs of National Natural Science Foundation of China and Pakistan Science Foundation(PSF-NSFC-IV/Phy/P-PU(31));the Haihe Laboratory of Sustainable Chemical Transformations for financial support。

摘　　要：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-TiO_(2)/Ba TiO_(3)/p-TiO_(2)(TBTm)heterojunction in which the piezoelectric Ba TiO_(3) layer is sandwiched between n-TiO_(2)and p-TiO_(2).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 m A cm^(-2)at 1.23 V versus reversible hydrogen electrode(RHE),which is 2.4-and 1.5-times higher than TiO_(2) and TiO_(2)–Ba TiO_(3) 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 TiO_(2) 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.

关 键 词：PHOTOELECTROCHEMICAL Piezoelectric polarization HETEROJUNCTION Charge separation 

分 类 号：TK511[动力工程及工程热物理—热能工程] TK91[理学—物理化学] O643.36[理学—化学]