过渡金属硒化物作为染料敏化太阳能电池对电极催化性能的影响

探索和开发廉价替代铂对电极催化材料已经成为染料敏化太阳能电池(DSCs)研究的热点.人们已经证明过渡金属硒化物(TMSes)是一种很有发展潜力的非铂对电极催化材料而在DSCs体系中得以应用.然而目前对过渡金属硒化物作为对电极催化材料在DSCs中的研究尚不够深入,同时对硒化物材料还缺乏系统的研究.利用热溶剂法合成了两种过渡金属硒化物Cr5.6Se8和HfSe3并用作高效DSCs对电极催化材料.电化学测试结果表明这两种硒化物对I-3/I-电对的还原反应具有良好的催化活性,组装的器件能量转换效率分别为7.27;和7.52;,与Pt相应器件的性能相当.这一结果进一步证实了硒化物作为对电极材料的可行性,为新型硒化物对电极的研究提供基础.

Insights on Catalytic Activities of Transition Metal Selenides as Efficient Counter Electrode Materials for Dye-sensitized Solar Cells

Exploiting an alternative of the Pt-based counter electrode (CE) materials for triiodide reduction reaction has become a major interest in the fundamental research of dye-sensitized solar cells (DSCs).Transition-metal selenides (TMSes) was proved a promising non-precious metal electrocatalysts and be used as counter electrode in DSCs.However, the research on TMSes as counter electrode material in DSCs is not enough in-depth and lack systematic research.Two TMSes, Cr5.6Se8 and HfSe3 were prepared by a free-reductant solvothermal method and used them as counter electrodes in high efficiency DSCs.The electrochemical results show that these selenides have excellent catalytic activity for the reduction of triiodine/iodine couple, the conversion efficiencies of corresponding DSCs are 7.27% for Cr5.6Se8 and 7.52% for HfSe3, respectively, comparable to DSCs based on sputtered Pt CE.These results further prove the possibility of selenides as a potential CE materials, and provided a basic research for new selenides.