CdS形貌可控制备及其可见光分解水产氢性能

以还原型谷胱甘肽(GSH)作为硫源和结构导向剂水热法“一壶”制备系列硫化镉(CdS)光催化材料，采用透射电镜(HRTEM)、场发射扫描电镜(FESEM)、X射线衍射仪(XRD)、紫外可见漫反射(UV-Vis)、荧光光谱(PL)、比表面分析仪(BET)和光解水产氢反应等对催化材料的微观表面结构、光吸收性能以及光催化性能进行了研究。结果表明：通过调节反应物的nCd/nS比和水热温度等参数可控的制备出分散性好的CdS实心纳米球(s-CdS)、空心纳米球(h-CdS)以及纳米棒(r-CdS)等不同微观形貌的光催化材料。对比研究了不同形貌光催化剂的光解水产氢的宏观性能，发现s-CdS产氢活性最高，h-Cd次之，r-CdS最差。这一结果可归结于构成实心球表面亚微晶的粒径相比其它形貌的小，导致电子-空穴对快速迁移至表面并与溶液反应，抑制体相复合，导致生成的氢气量大大的提高。

Synthesis of Morphology-Controlled CdS Photocatalysts for Hydrogen Evolution under Visible Light

Novel CdS photocatalytic nanomaterials were synthesized by a simple "one-pot" hydrothermal biomolecule-assisted method using glutathione (GSH) as the sulfur source and structure-directing reagent. HRTEM, FESEM, XRD, UV-Vis, PL, BET and photo-stimulated surface reaction technology were used to investigate the surface structure, photo absorption property and photocatalytic performance of CdS. Results show that various morphologies of CdS photocatalysts, such as solid nanospheres (s-CdS), hollow nanospheres (h-CdS) and nanorods (r-CdS), were obtained. The photocatalytic activity of s-CdS was superior to that of h-CdS and r-CdS under visible light. The excellent photocatalytic activity of s-CdS was ascribed to the small sizes of subnanocrystallites, which make it easy for photoinduced electrons and holes on the solid sphere to migrate to the surface and react with water and the sacrificial agent quickly.