Photo-thermal synergistic catalytic hydrogen production microcapsule and preparation and application thereof

Abstract

The invention provides a photo-thermal synergistic catalytic hydrogen production microcapsule and preparation and application thereof. Specifically, a phase change microcapsule with a core-shell structure is ultrasonically stirred in an n-type semiconductor precursor solution, the obtained phase change energy storage microcapsule with a double-shell structure is dispersed in an aqueous solution containing a plasmon material ionic compound through a hydrothermal method, and stirring is conducted under an illumination condition to obtain the photo-thermal synergistic catalysis hydrogen production microcapsule. The photo-thermal synergistic catalytic hydrogen production microcapsule not only can absorb spectral energy with the wavelength smaller than 760 nm to excite a photo-catalytic reaction, but also can absorb and store infrared spectral energy with the wavelength larger than 760 nm to excite a thermal catalytic reaction, so that energy in a solar spectrum is fully utilized in a graded mode, efficient and stable hydrogen production is achieved, and the photo-thermal synergistic catalytic hydrogen production microcapsule has considerable necessity for the technical field of photo-thermal catalytic hydrogen production.

Description

technical field [0001] The invention belongs to the technical field of photothermal catalytic hydrogen production. More specifically, it relates to a photothermal synergistic catalytic hydrogen production microcapsule and its preparation and application. Background technique [0002] Hydrogen is a clean and efficient energy carrier. The development of hydrogen energy is considered to be one of the important directions of future energy development. The green technology route of solar hydrogen production is considered to be one of the most promising hydrogen production methods. It can be achieved through thermal catalysis, photocatalysis, electrocatalysis, and photothermal synergistic catalysis. Among them, photocatalysis is the most simple and direct way, but the efficiency is very low; although thermal catalysis has considerable efficiency and yield, it requires complex solar heat collection equipment; photothermal synergistic catalysis is a catalytic method in which light ...

AI Technical Summary

Problems solved by technology

However, most of the existing photothermal synergistic catalysts have the following two problems: (1) under the excitation conditions of sunlight, they can generate a large amount of heat and undergo thermal catalysis, but they cannot store or regulate the heat. Under the condition of light, hydrogen cannot be produced, and the application scenarios are limited; (2) it can only absorb and convert ultraviolet-visible light, while infrared light with a wavelength greater than 760nm is mostly dissipated in the environment in the form of thermal radiation, which cannot be effectively Utilization, which limits the efficiency of hydrogen production

[0003] Phase change materials store heat during the phase change process, and are often used for solar heat storage due to their advantages such as large latent heat of phase change, high heat storage density of phase change, close to constant temperature in the heat absorption and release process, and easy control of the process. field, its heat absorption and release can be carried out simultaneously without being restricted by the presence or absence of light, such as patent CN201811041779.6, which discloses a supported catalyst with phase change heat storage function and its preparation method and application. The integrated synthesis with the catalyst makes full use of the characteristics of the strong heat storage capacity of the phase change material, stores or regulates the heat, and broadens the application scenarios of the photothermal synergistic catalyst, but it still cannot solve the above-mentioned second problem of the photothermal synergistic catalyst. One problem is that infrared light with a wavelength greater than 760nm cannot be effectively used, and the efficiency of hydrogen production is still limited to a certain extent.

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