Zero-dimensional ZnSe-one-dimensional FeSe2 heterojunction catalyst as well as preparation method and application thereof

Abstract

The invention relates to a zero-dimensional ZnSe-one-dimensional FeSe2 heterojunction catalyst as well as a preparation method and application of the zero-dimensional ZnSe-one-dimensional FeSe2 heterojunction catalyst. The method comprises the following steps: mixing Zn (CH3COO) 2.2 H2O, SeO2, sodium hexadecyl benzene sulfonate, hydrazine hydrate and water to form a precursor solution, and putting the precursor solution into a hydrothermal reaction kettle for hydrothermal reaction to obtain zero-dimensional nano granular ZnSe; zero-dimensional nano granular ZnSe, FeCl3, Na2SeO3, cetyltrimethylammonium bromide, hydrazine hydrate and water are mixed into a precursor solution, and the precursor solution is placed in a hydrothermal reaction kettle to be subjected to secondary hydrothermal reaction. The catalytic hydrogen production rate and the photocurrent density of the zero-dimensional ZnSe-one-dimensional FeSe2 heterojunction catalyst prepared by the preparation scheme are 2.4 times and 3 times of those of a single ZnSe product respectively, and the performance of the heterojunction photocatalyst is obviously enhanced. The method is simple in process, easy to control and high in production efficiency.

Description

technical field [0001] The invention relates to a zero-dimensional ZnSe-one-dimensional FeSe 2 Heterojunction catalyst and its preparation method and application. Background technique [0002] ZnSe is a new type of photoelectric material, and it has been reported that zero-dimensional nanoparticle ZnSe can be obtained by hydrothermal synthesis. This zero-dimensional nanoparticle ZnSe has a large specific surface area and exhibits certain photoelectric conversion and catalytic properties. FeSe 2 It is a one-dimensional nano-rod material, which is suitable for loading nano-particle materials to construct heterojunction structure materials. Studies have shown that constructing catalysts with heterojunction structures can improve the catalytic activity of traditional single catalyst materials. There is no report to obtain zero-dimensional ZnSe-one-dimensional FeSe 2 For heterojunction catalysts, the applicant found that the zero-dimensional nano-particle ZnSe single materia...

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Problems solved by technology

There is no report to obtain zero-dimensional ZnSe-one-dimensional FeSe 2 For heterojunction catalysts, the applicant found that the zero-dimensional nanoparticle ZnSe single material has a large band gap (2.7eV), high internal resistance, and low internal carrier separation and transmission efficiency. If it can be combined with One-dimensional narrow bandgap semiconductor FeSe 2 Composite, it is expected to get zero-dimensional ZnSe-one-dimensional FeSe with enhanced performance 2 heterojunction catalyst

However, the synthesis conditions of zero-dimensional nanogranular ZnSe and one-dimensional nanorod-like FeSe 2 The difference is large, and it is difficult to obtain composites compatible with these two nanomaterials. Therefore, the present invention provides a mature and reliable method to prepare zero-dimensional ZnSe-one-dimensional FeSe 2 heterojunction catalysts and their applications in photocatalytic hydrogen production and photoelectrochemistry

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