Tip-induced directional charge separation on one-dimensional BiVO4 nanocones for asymmetric light absorption  

作　　者：Nengcong Yang Ruotian Chen Chenwei Ni Dongfeng Li Qi Sun Lifang Liu Yu Qi Shengye Jin Xiuli Wang Fengtao Fan Can Li Fuxiang Zhang 

机构地区：[1]State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Dalian National Laboratory for Clean Energy,Chinese Academy of Sciences,Dalian 116023,Liaoning,China [2]State Key Laboratory of Molecular Reaction Dynamics and Dynamics Research Center for Energy and Environmental Materials,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China [3]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Journal of Energy Chemistry》2022年第9期326-332,I0009,共8页能源化学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(21925206,21633009,21902156);the National Key R&D Program of China(2020YFA0406102);the DICP Foundation of Innovative Research(DICP I201927);the Dalian Science and Technology Innovation Fund(2020JJ26GX032);the Liaoning Doctor Scientific Research Initiation Fund(2019-BS-241)。

摘　　要：One dimensional(1D)semiconductor is a class of extensively attractive materials for many emerging solar energy conversion technologies.However,it is still of shortage to assess the impact of 1D structural symmetry on spatial charge separation and understand its underlying mechanism.Here we take controllably-synthesized 1D BiVO_(4)nanocones and nanorods as prototypes to study the influence of 1D symmetry on charge separation.It is found that the asymmetric BiVO_(4)nanocones enable more effective charge separation compared with the symmetric nanorods.The unexpected spatial charge separation on the nanocones is mainly ascribed to uneven light absorption induced diffusion-controllable charge separation due to symmetry breaking of 1D nanostructure,as evidenced by spatial and temporal resolved spectroscopy.Moreover,the promotion effect of charge separation on the nanocones was quantitatively evaluated to be over 20 times higher than that in BiVO_(4)nanorods.This work gives the first demonstration of the influence of 1D structural symmetry on the charge separation behavior,providing new insights to design and fabricate semiconductor materials for efficient solar energy conversion.

关 键 词：Charge separation Tip-enhanced light absorption Surface photovoltage BIVO4 Photocatalysis 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TN304[电子电信—物理电子学]