Photo-electrochemical hydrogen evolution electrode based on MoS2 and Ag modified silicon nanowire array and application thereof

Abstract

The invention discloses a photo-electrochemical hydrogen evolution electrode based on a MoS2 and Ag modified silicon nanowire array and a three-electrode system and an application thereof. The photo-electrochemical hydrogen evolution electrode based on the MoS2 and Ag modified silicon nanowire array comprises a silicon nanowire array, a Ag nano-granule layer and a MoS2 nano-granule layer with a charge transfer function, wherein the silicon nanowire array is prepared from a two-step metal-assisted catalysis electroless etching method; the MoS2 nano-granule layer is compounded on the surface of the silicon nanowire array modified by the Ag nano-granule layer by a thermal decomposition technology. By means of increasing the Ag in the MoS2 modified silicon nanowire array as a charge transfer medium, the charge transfer of the solid-solid interface is increased, so that more photo electrons for the hydrogen reduction reaction on the MoS2 can be provided, the participation probability of the photo electrons in the hydrogen reduction reaction is greatly increased and the energy conversion efficiency is increased, and the three-electrode system is constructed for industrial water decomposition to obtain the hydrogen energy.

Description

technical field [0001] The invention belongs to the field of electrochemistry, in particular to a MoS-based 2 and Ag-modified silicon nanowire array photoelectrochemical hydrogen evolution electrode, a two-electrode or three-electrode system using the electrode, and other applications of the electrode. Background technique [0002] Hydrogen or hydrocarbons obtained by splitting water can be used as energy for human use, and using solar energy to split water to obtain these energies is an ideal solution. From the perspective of thermodynamics and kinetics, there are great obstacles in the direct photolysis of water, which makes this process difficult to realize in practice, and has become the focus of researchers around the world. The intervention of electrochemical catalysts or photoelectrochemical catalysts will greatly reduce the kinetic hindrance of photo-splitting water. Noble metal catalysts, the most representative of which are Pt, have become the most important mater...

AI Technical Summary

Problems solved by technology

transition metal sulfide MoS 2 , is a cheap and abundant material for noble metals, but MoS 2 It was once considered unsuitable as a hydrogen evolution material, because the bulk structure of MoS 2 Low efficiency of hydrogen electrolysis

However, with the advancement of science and technology, especially the rapid development of nanotechnology, this theory is facing great challenges and changes.

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