Efficient charge separation is a key factor that determines the efficiency of photoelectrochemical(PEC)water splitting.Here,we introduce controllable vanadium dopants to the ZnO nanorod arrays(NRAs)as a photoanode.The...Efficient charge separation is a key factor that determines the efficiency of photoelectrochemical(PEC)water splitting.Here,we introduce controllable vanadium dopants to the ZnO nanorod arrays(NRAs)as a photoanode.The optimal vanadium doping amount exhibited a negative shift in the flatband potential,which was favorable for charge separation,resulting in a maximum applied bias photo-to-current efficiency of 0.8%,which was 2.1 times that of the pristine ZnO photoanode.More importantly,V-doping induced ZnO ferroelectric behavior was adopted to further optimize the PEC performance through the ferroelectric polarization by external electric field poling.The negative bias poling enlarged the band bending at the electrode/electrolyte interface,which facilitated the separation of photogenerated charges and thus resulted in an increased efficiency of 1.04%.This work provides a new method for the design of ferroelectric materials as efficient photoanodes for PEC water splitting.展开更多
基金supported by the National Key Research and Development Program of China(No.2013CB932602)the National Key Research and Development Program of China 2016YFA0202701+3 种基金the Program of Introducing Talents of Discipline to Universities(B14003)National Natural Science Foundation of China(No.51527802,51232001,51372020 and 51602020)Beijing Municipal Science&Technology Commission(Z151100003315021)the China Postdoctoral Science Foundation(No.2016M600039).
文摘Efficient charge separation is a key factor that determines the efficiency of photoelectrochemical(PEC)water splitting.Here,we introduce controllable vanadium dopants to the ZnO nanorod arrays(NRAs)as a photoanode.The optimal vanadium doping amount exhibited a negative shift in the flatband potential,which was favorable for charge separation,resulting in a maximum applied bias photo-to-current efficiency of 0.8%,which was 2.1 times that of the pristine ZnO photoanode.More importantly,V-doping induced ZnO ferroelectric behavior was adopted to further optimize the PEC performance through the ferroelectric polarization by external electric field poling.The negative bias poling enlarged the band bending at the electrode/electrolyte interface,which facilitated the separation of photogenerated charges and thus resulted in an increased efficiency of 1.04%.This work provides a new method for the design of ferroelectric materials as efficient photoanodes for PEC water splitting.
