Cobalt phosphide/nitrogen-doped porous carbon composite counter electrode material for dye-sensitized solar cell and preparation method thereof

Abstract

The invention discloses a cobalt phosphide / nitrogen-doped porous carbon composite counter electrode material for a dye-sensitized solar cell and a preparation method thereof. The cobalt phosphide / nitrogen-doped porous carbon composite counter electrode material is composed of cobalt phosphide and nitrogen-doped porous carbon, the cobalt phosphide is embedded into a surface of a carbon wall of thenitrogen-doped porous carbon, the mass fraction of the cobalt phosphide in the composite counter electrode material is 30-60 wt.%, an organic-inorganic hybridized cobalt phosphonate precursor and an organic nitrogen source-formaldehyde-resorcinol resin / F127 copolymer are synthesized in sequence to serve as a carbon source and nitrogen source co-precursor and are obtained through hydrothermal synergistic self-assembly, high-temperature carbonization, nitridation and other modes of the two. The cobalt phosphide / nitrogen-doped porous carbon composite counter electrode material with the novel structure provided by the invention shows the performance advantages of relatively small charge transfer impedance, relatively high photoelectric conversion efficiency, long-period use stability and the like in the application of a dye-sensitized solar cell, and is low in preparation cost, simple in method and easy to realize industrial production.

Description

technical field [0001] The invention relates to the technical field of counter electrode materials for dye-sensitized solar cells, in particular to a cobalt phosphide / nitrogen-doped porous carbon composite counter electrode material for dye-sensitized solar cells and a preparation method thereof. Background technique [0002] With the development of society and the advancement of science and technology, the rapid development of social productivity has been greatly promoted, especially the wide application of electric energy, which has provided a strong boost for the development of multiple fields of society. Dye-sensitized solar cells have the advantages of high photoelectric conversion efficiency, simple manufacturing process, low price, and environmental friendliness. They have attracted extensive attention from domestic and foreign scientific research and technical personnel, and have become the most promising photoelectric conversion device of the new generation. [0003...

AI Technical Summary

Problems solved by technology

Among them, the solid-state synthesis method is to prepare cobalt phosphide by phosphiding metal or metal oxide, but the prepared cobalt phosphide particles are large and the specific surface area is low [7]; the cobalt phosphide prepared by the solution synthesis method is nano-particles, but Generally, it is a phosphorus-rich semiconductor phase with low conductivity, poor crystallinity, and easy aggregation of particles[7,8]

This structural defect leads to a relatively low catalytic activity of cobalt phosphide, resulting in a slow reaction rate for the reduction of iodide ions to iodide ions, thereby reducing the photoelectric conversion efficiency of dye-sensitized solar cells.

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