设计具有广泛光吸收的强大光催化剂,有效的电荷分离,和足够的活性位点对于实现有效的太阳能转换至关重要。然而,通过单一材料调制方法同时实现这些目标提出了挑战。这里,设计并制造了2D超薄富氧空位(Ov)的Bi2W0.2Mo0.8O6固溶体光催化剂,以通过组件和结构优化来解决这一难题。具体来说,具有超薄结构的固溶体的构造最初促进了光诱导电子-空穴对的分离,而Ov的引入加强了这种分离。同时,Ov的存在将光吸收扩展到NIR区域,触发光热效应,进一步增强电荷分离并加速氧化还原反应。因此,Ov-Bi2W0.2Mo0.8O6中的光致电荷载流子通过2D固溶体的协同作用逐步分离,OV,和太阳能供暖。此外,OV的引入暴露了用作反应性路易斯酸位点的表面金属位点,促进甲苯的吸附和活化。因此,设计的Ov-Bi2W0.2Mo0.8O6揭示了在宽光谱下2445µmolg-1h-1的光热催化甲苯氧化速率增强,而没有额外的热量输入。性能是Bi2WO6和Bi2MoO6纳米片的9.0和3.9倍,分别。
Designing robust photocatalysts with broad light absorption, effective charge separation, and sufficient reactive sites is critical for achieving efficient solar energy conversion. However, realizing these aims simultaneously through a single material modulation approach poses a challenge. Here, a 2D ultrathin oxygen vacancy (Ov)-rich Bi2W0.2Mo0.8O6 solid solution photocatalyst is designed and fabricated to tackle the dilemma through component and structure optimization. Specifically, the construction of a solid solution with ultrathin structure initially facilitates the separation of photoinduced electron-hole pairs, while the introduction of Ov strengthens such separation. In the meantime, the presence of Ov extends light absorption to the NIR region, triggering a photothermal effect that further enhances the charge separation and accelerates the redox reaction. As such, photoinduced charge carriers in the Ov-Bi2W0.2Mo0.8O6 are separated step by step via the synergistic action of 2D solid solution, OV, and solar heating. Furthermore, the introduction of OV exposes surface metal sites that serve as reactive Lewis acid sites, promoting the adsorption and activation of toluene. Consequently, the designed Ov-Bi2W0.2Mo0.8O6 reveals an enhanced photothermal catalytic toluene oxidation rate of 2445 µmol g-1 h-1 under a wide spectrum without extra heat input. The performance is 9.0 and 3.9 times that of Bi2WO6 and Bi2MoO6 nanosheets, respectively.