水热法制备CdS同质结及其在清洁能源生产中的应用

Hydrothermal synthesis of CdS homojunction and its application in clean energy production

以CdCl_(2)·2.5H_(2)O和Na_(2)S·9H_(2)O为原料,通过一步水热法成功制备了c-CdS/h-CdS同质结。采用XRD、Raman、SEM、UV-Vis DRS、SPV等表征手段对样品的结构形貌、能带结构、光生电子和空穴的分离效率进行分析,以可见光为光源,考察样品光催化分解水产氢活性。研究结果表明,c-CdS和h-CdS的能带结构匹配,能够组成“II型”同质结,这种同质结能够提高光生电子和空穴的分离效率,进而提高光催化活性。在可见光分解水产氢实验中,c-CdS/h-CdS同质结样品的产氢速率高达1855μmol·(g·h)^(-1),为纯c-CdS和纯h-CdS样品的1.6倍和2.5倍。

c-CdS/h-CdS homojunction was successfully prepared through one-step hydrothermal method using cadmium chloride and sodium sulfide as raw materials.XRD,Raman,SEM,UV-Vis DRS,SPV and other characterization methods were used to analyze the structure and morphology,energy band structure,separation efficiency of photogenerated electrons and holes of the as-prepared samples.The photocatalytic activity of water spliting for hydrogen production was investigated using visible light as the light source.The results show that the energy band structures of c-CdS and h-CdS match well and can form"Type II"homojunction,which can improve the separation efficiency of photogenerated electrons and holes,thereby improving the photocatalytic activity.Under visible light irradiation,the hydrogen production rate of c-CdS/h-CdS homojunction sample is up to 1855μmol·(g·h)^(-1),which is 1.6 times and 2.5 times higher than that of pure c-CdS and pure h-CdS samples,respectively.