Journal of Energy Chemistry ›› 2022, Vol. 72 ›› Issue (9): 326-332.DOI: 10.1016/j.jechem.2022.04.015

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

Nengcong Yanga,c, Ruotian Chena, Chenwei Nia,c, Dongfeng Lia,c, Qi Sunb,c, Lifang Liua,c, Yu Qia, Shengye Jinb, Xiuli Wanga,fengtao Fana,*, Can Lia, Fuxiang Zhanga,*   

  1. aState Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Dalian National Laboratory for Clean Energy, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
    bState 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;
    cUniversity of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2022-02-15 Revised:2022-03-25 Accepted:2022-04-07 Online:2022-09-15 Published:2022-10-13
  • Contact: * E-mail addresses: ftfan@dicp.ac.cn (F. Fan), fxzhang@dicp.ac.cn (F. Zhang).

Abstract: 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 BiVO4 nanocones and nanorods as prototypes to study the influence of 1D symmetry on charge separation. It is found that the asymmetric BiVO4 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 sep-aration 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 BiVO4 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.

Key words: Charge separation, Tip-enhanced light absorption, Surface photovoltage, BiVO4, Photocatalysis