Colloidal Synthesis of Ultrathin Monoclinic BiVO4 Nanosheets for Z-Scheme Overall Water Splitting under Visible Light
Colloidal Synthesis of Ultrathin Monoclinic BiVO4 Nanosheets for Z-Scheme Overall Water Splitting under Visible Light
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DOI：
10.1021/acscatal.8b01645
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发表时间：
2018-09-01
期刊：
影响因子：
12.9
通讯作者：
Zhang, Hao
中科院分区：
文献类型：
--
作者：
Dong, Chunwei;Lu, Siyu;Zhang, Hao
近年来，二维光催化剂由于其在太阳能转化领域的优异性能而受到人们的关注。然而，具有非层状晶体结构的2D光催化剂的合成仍然充满挑战。本文采用胶体两相法合成了具有单斜晶体结构的二维BiVO 4纳米片。所制备的BiVO 4纳米结构具有小于3 nm的厚度，但直径大于1.2 μ m。此外，HNO 3的存在有利于BiVO 4纳米结构的生长，其表面几乎裸露，{010}晶面大部分暴露，晶体结构中氧空位（V-O）分布广泛，这有利于其在可见光照射下的光催化活性。因此，我们的2D BiVO 4 NS在水氧化方面表现出令人印象深刻的光催化性能。O-2释放速率为107.4 μ mol·h（-1），表观量子产率（AQY）高达26.1%（420 nm）。此外，通过使用我们的二维BiVO 4 NS作为O-2-释放光催化剂，Ru-SrTiO 3：Rh和Fe 3 +/Fe 2+分别作为H-2-释放光催化剂和氧化还原介体，成功地构建了Z-方案的整体水裂解系统。在可见光照射下，我们的Z-计划的光催化体系表现出较高的H-2和O-2的释放速率（16.7和8.0 μ mol h（-1））与AQY为1.88%（420 nm）和良好的光催化稳定性。
Recently, ultrathin 2D photocatalysts have attracted people's attention due to their performances in the area of solar energy conversion. However, the synthesis of ultrathin 2D photocatalysts with a nonlayered crystal structure is still full of challenges. Herein, ultrathin 2D BiVO4 nanosheets (NSs) with monoclinic crystal structure are synthesized through a convenient colloidal two-phase method. The as-prepared BiVO4 NSs possess a thickness of less than 3 nm but a diameter larger than 1.2 mu m. Furthermore, the presence of HNO3 facilitates the growth of BiVO4 NSs with nearly naked surfaces, largely exposed {010} planes, and widely distributed oxygen vacancies (V-O) inside the crystalline structure, which are of great benefit to their photocatalytic activity under visible light irradiation. As a result, our ultrathin 2D BiVO4 NSs exhibit an impressive photocatalytic performance for water oxidation. The O-2 evolution rate is 107.4 mu mol h(-1), and the apparent quantum yield (AQY) is as high as 26.1% (420 nm). Furthermore, by employing our ultrathin 2D BiVO4 NSs as the O-2-evolving photocatalyst, Ru-SrTiO3:Rh and Fe3+/Fe2+ as the H-2-evolving photocatalyst, and the redox mediator, respectively, a Z-scheme overall water splitting system is successfully constructed. Under visible light irradiation, our Z-scheme photocatalytic system presents high H-2 and O-2 evolution rates (16.7 and 8.0 mu mol h(-1)) with an AQY of 1.88% (420 nm) and good photocatalytic stability.