School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an 710049, China.
School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an 710049, China.
J Colloid Interface Sci. 2023 Aug 15;644:346-357. doi: 10.1016/j.jcis.2023.04.078. Epub 2023 Apr 23.
Photocatalyst systems generally consist of catalysts and cocatalysts to realize light capture, charge carrier migration, and surface redox reactions. Developing a single photocatalyst that performs all functions while minimizing efficiency loss is extremely challenging. Herein, rod-shaped photocatalysts CoO/CoO/CoP are designed and prepared using Co-MOF-74 as a template, which displays an outstanding H generation rate of 6.00 mmol·g·h when exposed to visible light irradiation. It is 12.8 times higher than pure CoO. Under light excitation, the photoinduced electrons migrate from the catalysts of CoO and CoO to the cocatalyst CoP. The trapped electrons can subsequently undergo a reduction reaction to produce H on the surface. Density functional theory calculations and spectroscopic measurements reveal that enhanced performance results from the extended lifetime of photogenerated carriers and higher charge transfer efficiency. The ingenious structure and interface design presented in this study may guide the general synthesis of metal oxide/metal phosphide homometallic composites for photocatalysis.
光催化剂系统通常由催化剂和共催化剂组成，以实现光捕获、载流子迁移和表面氧化还原反应。开发一种既能实现所有功能又能最大限度地减少效率损失的单一光催化剂极具挑战性。在此，我们设计并制备了棒状光催化剂 CoO/CoO/CoP，其以 Co-MOF-74 为模板，在可见光照射下显示出 6.00 mmol·g·h 的出色 H 生成速率，是纯 CoO 的 12.8 倍。在光激发下，光生电子从 CoO 和 CoO 催化剂迁移到共催化剂 CoP。被捕获的电子随后可以在表面上进行还原反应以产生 H。密度泛函理论计算和光谱测量表明，性能的提高源于光生载流子的寿命延长和电荷转移效率的提高。本研究中呈现的巧妙结构和界面设计可能为用于光催化的金属氧化物/金属磷化物同金属复合材料的一般合成提供指导。
