新型多结纳米光催化剂的制备及在光解水制氢中的性能研究

Preparation of novel multi-junction nanophotocatalyst and its performance in photolysis of water to hydrogen

关键词:  光催化剂  双p-n结  隧穿结  光解纯水  制氢 

Key words:  photocatalyst  double p-n junction  tunneling junctions  photolysis of pure water  hydrogen production

摘要:

目的 在纳米光催化制氢反应中,传统单p-n 结催化剂受限于禁带宽度,仅能吸收太阳光谱特定区域的光子,对太阳能的利用效率不高。为提高催化剂对太阳能的利用效率,研究制备了一种高活性的光解纯水催化剂。方法 受多结太阳能电池的启发,采用简单的浸渍法,将禁带宽度不同的半导体材料p-n结按照禁带宽度由低向高的叠加连接,制得一种新型多结纳米光催化剂,并用XRD、XPS、TEM技术对催化剂的结构进行表征。结果 多结纳米光催化剂进行光解纯水制氢反应3 h后,产氢量为15.53 μmol,是传统单p-n结催化剂的93倍。结论 该结果为合成更稳定的多结纳米光催化剂,实现高效的太阳能转换提供了新的方向和思路。 

Abstract:

Objective In the nano photocatalytic hydrogen production reaction, traditional single p-n junction catalysts are limited by the bandgap width and can only absorb photons in specific areas of the solar spectrum, resulting in low solar energy utilization efficiency. To increase the utilization efficiency of solar energy by catalysts, a high activity photocatalytic pure water catalyst was prepared. Methods Taking inspiration from multi-junction solar cells, this paper adopted a simple impregnation method to superimpose p-n junctions of semiconductor materials with different bandgap widths from low to high in order to prepare a new type of multi-junction nanophotocatalyst. The structure of the catalyst was characterized by XRD, XPS, and TEM. Results After 3 h of photolysis of pure water to hydrogen production with the multi-junction nanophotocatalyst, the hydrogen production was 15.53 μmol, which was 93 times that of the traditional single p-n junction catalyst. Conclusion The results provide a new direction and new idea for the synthesis of more stable multi-junction nanophotocatalysts to achieve efficient solar energy conversion.