Fudan Develops High Efficiency Electrodes Based on Metal Selenide for Solar Cells
Recently, the research group of the Advanced Materials Laboratory of Fudan University Wang Zhongsheng independently developed a high-efficiency counter electrode based on metal selenide. The electrode was applied to dye-sensitized solar cells and achieved energy conversion efficiency of up to 9.4%. This has been reported. Based on iodine pairs of dye-sensitized solar cells, the highest efficiency achieved using non-platinum counter electrodes. The results of this research have been accepted and published by the American Chemical Society.
According to reports, dye-sensitized solar cells imitate the principle of photosynthesis and convert light energy into electrical energy. They are mainly composed of dye sensitizers, wide band gap semiconductor nanocrystals, electrolytes containing iodine pairs, and counter electrodes. In view of excellent electrocatalytic properties of platinum metal, current high-performance dye-sensitized solar cells use electroplated conductive glass as the counter electrode. However, due to the low reserves and high price of platinum, the large-scale production and application of dye-sensitized solar cells are greatly limited. Therefore, the development of low-cost, high-efficiency non-platinum counter electrode has always been one of the research hotspots in this field.
The research group used in-situ low-temperature hydrothermal synthesis to grow cobalt selenide and nickel selenide nanocrystals on conductive glass in situ, which can be directly applied to dye-sensitized solar cells without any post-treatment, and excellent cell performance was obtained. Cobalt selenide has higher electrocatalytic properties than platinum metal.
Wang Zhongsheng stated: "Using inexpensive cobalt selenide instead of expensive platinum metal as the counter electrode has improved the photocurrent and energy conversion efficiency."
Relevant experts believe that these two new types of metal-selenide electrocatalytic materials are characterized by high efficiency, low cost, and stability, as well as simple preparation methods and low energy consumption, and are expected to be used for the large-scale production of dye-sensitized solar cells. (Reporter: Huang Xin)
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