Preparation method of graphene and conductive carbon black composite material counter electrode

Abstract

The invention provides a preparation method of a graphene and conductive carbon black composite material counter electrode and relates to a preparation method of a counter electrode. The invention aims to solve the problems that a traditional platinum counter electrode is high in price, is high in toxicity and does not facilitate large-scale use, and a graphene conductive film is complicated in preparation process, high in processing temperature and nonideal in electrical conductivity. The preparation method of the grapheme and conductive carbon black composite material counter electrode comprises the following steps of: step 1, weighing and uniformly mixing graphene with conductive carbon black to obtain a mixture; step 2, ball-milling the mixture obtained in the step 1 as well as polytetrafluoroethylene and N-methyl pyrrolidone to obtain slurry; and step 3, scrape-coating the slurry obtained in the step 2 on conductive glass and drying to obtain the graphene and conductive carbon black composite material counter electrode. The preparation method has the beneficial effects that the cost is low, and the process is simple; and when a counter electrode film is formed by 25 percent of grapheme, 70 percent of conductive carbon black and 5 percent of PTFE (Polytetrafluoroethylene), the photoelectric conversion efficiency of a system is the highest and exceeds that of the traditional platinum counter electrode. The preparation method is used for preparing the counter electrode.

Description

technical field [0001] The invention relates to a preparation method of a counter electrode. Background technique [0002] In the dye-sensitized solar cell (DSSC), the counter electrode can be divided into two categories according to the different preparation materials: metallic counter electrode and non-metallic counter electrode. [0003] Among metal counter electrodes, platinum is 3 - With high catalytic activity, it became the earliest material for the counter electrode of dye-sensitized solar cells, and has been widely used as the counter electrode in the laboratory. But platinum is a precious metal and expensive, so it is not conducive to large-scale use. At the same time, the stability of the platinum counter electrode is not high enough, and the photoelectric conversion efficiency of the system is reduced due to easy poisoning in the battery. The nickel counter electrode is prepared by electrochemical coating method, and its monochromatic light conversion efficie...

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Problems solved by technology

[0005] The invention aims to solve the problems that the traditional platinum counter electrode is expensive, the electrode is easily poisoned, it is not conducive to large-scale use, the preparation process of the graphene conductive film is complicated, the processing temperature of the film is high, and the conductivity of the film is not ideal, and provides a A kind of preparation method of graphene and conductive carbon black composite material opposite electrode

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