Ma Hongyu, Tan Yaqi, Liu Zhifei, Wei Jianhong, Xiong Rui
Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education and School of Physics and Technology, Wuhan University, Luojiashan Road, Wuhan 430072, China.
Nanomaterials (Basel). 2021 Jan 4;11(1):104. doi: 10.3390/nano11010104.
Photocatalytic hydrogen evolution is a promising" green chemistry" route driven by sunlight for the direct water splitting into value-added hydrogen energy. Herein, with the object of exploring the effect of CuO loading on WO photocatalytic activity, a 3D Urchin-like CuO modified WO (CuO/WO) microspheres with different CuO loadings were synthesized via thermochemical precipitation combined with solvent-thermal method. The obtained CuO/WO microspheres were analyzed by means of X-ray diffraction (XRD), scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and photoluminescence (PL), etc. The results infer that the urchin-like 3D morphology with a high surface area and abundant 1D nanowires promotes electron transfer, the introduction of CuO further increases the number of active sites, thereby ensuring fast interfacial charge transfer to improve photocatalytic performance. During photocatalytic H evolution from water splitting, 5 wt.% CuO/WO shows the optimal performance, the H yield is almost 3.22 times that of the undoped counterparts. This work presents that oxygen-vacancy-rich heterojunction nanocomposites can be used as a new strategy to design materials with high photocatalytic activity.
光催化析氢是一种很有前景的“绿色化学”途径，由阳光驱动，可将水直接分解为有价值的氢能。在此，以探究CuO负载量对WO光催化活性的影响为目的，通过热化学沉淀结合溶剂热法合成了具有不同CuO负载量的三维海胆状CuO修饰的WO（CuO/WO）微球。采用X射线衍射（XRD）、扫描电子显微镜（SEM）、能量色散X射线光谱（EDS）、透射电子显微镜（TEM）、X射线光电子能谱（XPS）和光致发光（PL）等手段对所得的CuO/WO微球进行了分析。结果表明，具有高表面积和丰富一维纳米线的海胆状三维形态促进了电子转移，CuO的引入进一步增加了活性位点的数量，从而确保了快速的界面电荷转移以提高光催化性能。在光催化水分解析氢过程中，5 wt.%的CuO/WO表现出最佳性能，氢气产率几乎是未掺杂对应物的3.22倍。这项工作表明，富氧空位的异质结纳米复合材料可作为设计高光催化活性材料的新策略。
