Photocathode based on metallic oxides, quantum dots and hydrogen generation catalyst and preparation method and application of photocathode

Abstract

The invention discloses a photocathode based on metallic oxides, quantum dots and a hydrogen generation catalyst. The photocathode comprises a metallic oxide layer, the quantum dots and the hydrogen generation catalyst. The quantum dots are adsorbed on the metallic oxide layer. The hydrogen generation catalyst is loaded on the metallic oxide layer and the quantum dots. The photocathode has the advantages that preparation is easy, the repeatability is good, the visible light conversion rate is high, the stability and the universality are high, and the catalyst is low in cost; the photocathode is the first photocathode hydrogen generation system which is established with the metallic oxides being used as substrate materials and the quantum dot being used as a photosensitizer; according to the system, hydrogen generation based on photo-electro-catalysis is efficiently achieved in pure water (pH=7.0) with the quantum dots being used as the photosensitizer for the first time, conversion of optical energy to chemical energy (hydrogen energy) is achieved, and the photocathode has important practical significance and scientific significance.

Description

technical field [0001] The invention relates to the field of photoelectric catalytic hydrogen production. More specifically, it relates to a photocathode based on metal oxides, quantum dots and hydrogen production catalysts and its preparation and application. Background technique [0002] Energy is a material resource that provides various capabilities and power for human production and life. At present, human energy consumption mainly comes from fossil fuels. With the development of the economy, the energy crisis is becoming more and more serious. Some conventional energy reserves in the world can only maintain the needs of human existence for about half a century (such as oil), and the highest can only last for one or two hundred years (such as coal); on the other hand, environmental problems such as the greenhouse effect and acid rain brought about by the use of fossil fuels have seriously threatened the survival and development of human beings. Therefore, it is immine...

AI Technical Summary

Problems solved by technology

In 2010, Pickett et al. used disulfhydryl molecules as linking molecules to modify InP quantum dots on gold electrodes to construct a photocathode system [Angew.Chem.Int.Ed.2010,49,1574-1577], but the photogenerated The cathodic current (nanoampere) and photocatalytic hydrogen production (nanomole) are very low, and the synthesis conditions of the photosensitizer InP are harsh and toxic, which limit its further application and development.

Due to the presence of the protective layer, Cu 2 The photocorrosion of O was suppressed, and at a voltage of 0VvsNHE, a −7.6mAcm -2 current, the Faradaic efficiency is close to 100%, although the protective layer inhibits the Cu 2 Photocorrosion of O, but its preparation requires relatively high instrument conditions, and the operation is also complicated, and Pt is a noble metal, which is not conducive to large-scale use

Domen et al [J.Am.Chem.Soc.2013,135,3733-3735] used chemical bath deposition of CdS particles on ternary p-type CuGaSe 2 On semiconductors, Pt was further modified as a hydrogen-producing co-catalyst to build a photocathode. This photocathode showed high stability (more than 10 days), but the same problem is that CuGaSe needs to be prepared by atomic layer evaporation. 2 , high equipment requirements, complex operation, high cost of precious metals

At present, the sensitizers used in NiO photocathode are organic dye molecules, and the catalysts are metal complex molecules, but the synthesis routes of molecular sensitizers and catalysts are complex and have poor stability.

[0003] To sum up: At present, the photocathode for hydrogen production has the disadvantages of high material cost, complex synthesis, and high requirements for equipment.

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