Bi₂S₃-WO₃纳米半导体复合材料的制备及光催化析氢性能研究

Study on the Fabrication of Bi₂S₃-WWO₃ Semiconductor Nanocomposites and the Photocatalytic Hydrogen Evolution Performance

摘要: Bi₂S₃纳米材料是一种重要的半导体，拥有良好的光氧化和还原能力，在光催化方面有着非常大的潜力和应用前景。针对其光生电子和空穴再复合几率高的缺陷，本文通过WO₃与Bi₂S₃复合对Bi₂S₃进行改性，采用水热合成的方法制备了Bi₂S₃-WO₃纳米半导体复合材料，并对样品的组成、形貌和光催化析氢性能进行研究。复合材料中Bi₂S₃纳米棒和WO₃纳米棒彼此交叉、重叠交织在一起，且具有良好的结晶性。Bi₂S₃-WO₃复合材料具有很好的光催化析氢性能，当WO₃的摩尔含量为40%时其析氢性能可达到17.95 μmol∙h⁻¹g⁻¹，约为纯Bi₂S₃的1.5倍，光催化析氢稳定性良好，循环使用4次后光催化析氢效率降低了约11.1%。

Abstract: Bi₂S₃ is an important semiconductor, which can be a good candidate in the field of photocatalysis. To improve the separation of photo excited electrons and holes, the Bi₂S₃ was coupled with WO₃. The Bi₂S₃-WO₃ composites were synthesized by hydro-thermal method. The composition and morphology were characterized and the photocatalytic hydrogen evolution properties were studied. The Bi₂S₃-WO₃ composites have a good crystallinity, in which the Bi₂S₃ nanorods and WO3 nanorods cross and overlap with each other. The composites exhibit good photocatalytic hydrogen evolution performance and good photocatalytic stability. The hydrogen production rate is 17.95 μmol∙h⁻¹g⁻¹ which is about 1.5 times of that of pure Bi₂S₃ when the molar content of WO₃ is 40%. And the efficiency of photocatalytic hydrogen evolution reduces about 11.1% after 4 cycles.