Metal sulfide and graphene composite material counter electrode and its preparation method and application

Abstract

The invention relates to a counter electrode made of two-dimensional metal sulfide and graphene composite materials, a preparation method of the counter electrode and application of the counter electrode in dye sensitization solar cells. Metal sulfide and graphene composites are loaded on a conductive substrate for preparation. The metal sulfide and graphene composites are dissolved in a solution and are deposited to form a film after being filtered, compressed film plating is carried out on the conductive substrate, drying is carried out, and then the obtained counter electrode is cooled to be at a room temperature, wherein the mass ratio of the metal sulfide to graphene is 20:1 to 20, and the mass ratio of sulfide to tert-butyllithium is 1:5 to 50. Binding agents do not need to be added, and accordingly high-temperature impurity removing is not needed, and the appearance and the structure of the materials can be well maintained. Compared with the material of a Pt counter electrode, the materials are richly reserved in nature, and industrial production can be carried out on a large scale. Compared with materials of other counter electrodes, the materials are easy and convenient to prepare and excellent in catalytic performance, and accordingly the two-dimensional metal sulfide and graphene composite materials have wide application prospects in the field of the dye sensitization solar cells.

Description

technical field [0001] The invention relates to a counter electrode of a two-dimensional metal sulfide and graphene composite material, a preparation method thereof, and an application in a dye-sensitized solar cell. Background technique [0002] With the increasingly severe energy crisis and environmental crisis, it is imminent to find economical and environmentally friendly fuel substitutes. As a renewable resource with abundant resources, wide distribution, environmental friendliness and sustainable utilization, sunlight has attracted extensive attention, and the favorable conversion of solar energy into electrical energy has triggered a research boom in solar cells. Dye-sensitized solar cells are gradually showing their value because of their low price, simple packaging process, low energy consumption, environmentally friendly materials and high photoelectric conversion efficiency (the conversion rate can reach 12.3% under AM1.5 simulated sunlight). However, the researc...

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Problems solved by technology

Liu et al. [J.Mater.Chem.2012, 22, 21057] have synthesized molybdenum disulfide graphene composite material by high-temperature compounding method, and the photocatalytic ability of molybdenum disulfide after compounding with graphene is obviously improved, but due to this The method has poor controllability to the structure of molybdenum disulfide, and cannot effectively synthesize molybdenum disulfide with a two-dimensional structure

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