助催化剂Pt-Co合金纳米颗粒的合成及光催化制氢活性

Synthesis of co-catalyst Pt-Co alloy nanoparticles for effective photocatalytic hydrogen production

采用水热法合成了粒径在4nm左右的不同比例的Pt-Co合金纳米颗粒,作为助催化剂负载在商业CdS表面。用X射线衍射(XRD)、透射电镜(TEM)、选区电子衍射(SAED)、能谱分析(EDS)等技术对其进行表征。结果表明,确实合成了Pt-Co合金且负载良好。样品在模拟太阳光的条件下,测试其可见光分解水制氢性能,结果表明,n(Pt)∶n(Co)=3∶1时产氢性能最佳,为1 049μmol/h,光量子效率达到36%,与纯铂性能相当。

Pt-Co alloy nanoparticles in different proportions were synthesized by hydrothermal method, the sizes of which were about 4 nm. The Pt-Co alloy nanoparticles were loaded on the surface of commercial CdS as cocatalyst. The nanoparticles were characterized by X-ray diffraction （XRD）, transmission electron microscope （TEM）, selected area electron diffraction （SAED）, energy speetrum analysis （EDS） and so on. The results indicated that Pt-Co alloy nanoparticles were synthesized successfully and loaded perfectly on the surface of commercial CdS. The performances of splitting water to achieve hydrogen under visible light were tested on the condition of simulative solar light. The results illuminated that the performance was best when the molar ratio of Pt and Co was 3 ： 1, 1 049μmol/h. The photo-quantum efficiency was up to 36 %, which was equal to pure Pt.