Ternary semiconductor laminated composite photoelectrode, and preparation method and application thereof

Abstract

The invention discloses a ternary semiconductor laminated composite photoelectrode, and a preparation method and an application thereof. The photoelectrode has an effective substance with a chemical formula of TiO2 / ZnO / BiOCl. The preparation method for the photoelectrode comprises the following steps: preparing TiO2 nanowires on FTO through a hydrothermal method so as to obtain a sample substrate1, then preparing a ZnO seed crystal layer on the sample substrate 1 through a sol-gel method, preparing the ZnO seed crystal layer coated sample substrate 1 into a sample substrate 2 covered with a ZnO nanowire array through a hydrothermal method, successively subjecting the sample substrate 2 to cyclic soaking in a Bi(NO3)3 solution, distilled water, a KCl solution and distilled water, then carrying out calcination, annealing and washing so as to obtain the ternary semiconductor laminated composite photoelectrode. Compared with a single TiO2 sample, the TiO2 / ZnO / BiOCl composite photoelectrode provided by the invention has the following advantages: photocurrent intensity is significantly improved; an electron hole recombination rate is reduced; photoelectric performance is significantly reinforced; a photocatalytic reaction is successfully expanded from an ultraviolet light region to a visible light region; the utilization efficiency of solar energy is improved; and the TiO2 / ZnO / BiOClcomposite photoelectrode can be used for photoelectrochemical photolysis of water to produce hydrogen.

Description

technical field [0001] The invention belongs to the technical field of photoelectrochemistry, and in particular relates to a ternary semiconductor laminated composite photoelectrode and its preparation method and application. Background technique [0002] Photoelectrochemical water splitting to produce hydrogen is considered to be an important technology to solve the future global energy crisis, and it has gradually become a research hotspot in the field of new energy. The essential element of photoelectrochemical water splitting technology is the semiconductor photoelectrode, and the conversion efficiency and stability of the semiconductor photoelectrode are the key points that affect the effect of the entire system. Therefore, how to obtain a semiconductor photoelectrode with excellent performance is an important research topic in this field. n-type TiO was first reported by Honda and Fujishima et al. in 1972 2 Since the photoelectrode and its application to photoelectro...

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Problems solved by technology

[0003] In view of the deficiencies pointed out in the above background technology, the present invention provides a ternary semiconductor laminated composite photoelectrode and its preparation method and application, aiming to solve the problem of existing single TiO in the above background technology. 2 The mobility of electrons generated by semiconductor materials after absorbing light is low, and the separation effect of electrons and holes is poor, which easily leads to problems such as recombination of photogenerated charges and short photoresponse range.

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