Abstract Dye-sensitized solar cells (DSSCs) counter electrode (CE) is needed to have both good electrical conductivity and high catalytic activity, and composite materials are better meet these two requirements. In this work, Bi2S3/carbon nanofiber (CNFs) composites are synthesized by simple electrospinning and hydrothermal methods, and after optimization of the content of Bi2S3, the large amount Bi2S3 nanoparticles are grown densely on CNFs without agglomeration. Bi2S3/CNFs composites are first introduced into DSSCs as CE. The optimized Bi2S3/CNFs composites are of great electrochemical performance and obtain a photoelectric conversion efficiency (PCE) of 7.64 %, which is better than common used Pt CE (7.12 %). Thus Bi2S3/CNFs CE has great prospects based on low cost and simple fabrication process to develop Pt-free CEs which could accelerate the large-scale application of DSSCs.

中文翻译：

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在电纺碳纳米纤维上密集生长的 Bi2S3 纳米粒子作为液态太阳能电池的低成本对电极

摘要 染料敏化太阳能电池（DSSCs）对电极（CE）需要兼具良好的导电性和高催化活性，复合材料更好地满足了这两个要求。在这项工作中，Bi2S3/碳纳米纤维（CNFs）复合材料通过简单的静电纺丝和水热法合成，并在优化 Bi2S3 的含量后，大量的 Bi2S3 纳米颗粒在 CNFs 上密集生长而没有团聚。Bi2S3/CNFs 复合材料首先作为 CE 引入 DSSC。优化后的 Bi2S3/CNFs 复合材料具有良好的电化学性能，光电转换效率（PCE）为 7.64%，优于常用的 Pt CE（7.12%）。