碳纳米纤维负载Co3S4复合材料的合成及其在染料敏化太阳电池对电极的应用

Co_3S_4 Supported by Carbon Nanofibers Composite:Preparation and Application in Counter Electrode for Dye-Sensitized Solar Cells

采用水热法合成四硫化三钴(Co_3S_4)催化材料,并利用球磨和喷涂技术将其制备成对电极,结合新型无碘电解液Co^(2+)/Co^(3+)用于染料敏化太阳电池(dye-sensitized solar cells,简称DSCs)来研究其光电性能。测试结果显示,基于Co_3S_4对电极,DSCs的能量转化效率(power conversion efficiency,简称PCE)只有6.06%,远远低于Pt对电极(8.05%)。为了提高Co_3S_4的催化能力,采用静电纺丝技术制备碳纳米纤维(electrospun carbon nanofibers,简称ECs),结合水热法制备出不同负载量的碳纳米纤维负载四硫化三钴(Co_3S_4/ECs)复合催化材料用于对电极,结果表明,Co_3S_4/ECs的PCE最高可达(8.22±0.08)%,优于Pt对电极。

Cobaltosic sulfide （Co3S4） was synthesized by hydrothermal synthesis method. Combining the ball grinding mill and spray method, Co3S4 was prepared into counter electrode （CE） and fabricated dye-sensitized solar cells （DSCs） with the novel electrolyte Co^2＋/Co^3＋. The power conversion efficiency （PCE） obtained by the DSCs based on the pure Co3S4 CE was only 6.06%, which was much smaller than that of Pt （8.05%）. To improve the catalytic activity of pure Co3S4, electrospun carbon nanofibers （ECs） were fabricated by the electrospun method and the composite of ECs supported cobaltosic sulfide （Co3S4/ECs） was synthesized by hydrothermal synthesis method. And the DSCs based on Co3S4/ECs CE achieved a high PCE of （8.22±0.08）%, which was a little higher than that of Pt （8.05%）.