Haozhe Zhang, Yanjie Wang, Wentian Niu, Tatchamapan Yoskamtorn, Mingyu Luo, Robert Tayler, Sarah Day, Shik Chi Edman Tsang
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引用次数: 0
摘要
通过整合类石墨烯材料来增强层状过氧化物的光催化活性,为优化太阳能转换提供了一条前景广阔的途径。石墨烯富含电子的特性与其高电子传导性相结合,可作为一种有效的光敏剂,从而提高可见光的收集能力。在这项研究中,我们首次将超薄剥离的 Dion-Jacobson 包晶石层与还原氧化石墨烯(rGO)层组装在一起,通过定制的静电方法获得了高比表面积的层状纳米复合材料。为了进一步完善层状包晶石-还原氧化石墨烯复合材料的电子特性,我们探索了在狄昂-矢量包晶石中使用各种镧系元素作为 A 位阳离子,包括 LaNb2O7 (LNO)、PrNb2O7 (PNO) 和 NdNb2O7 (NNO)。合成的复合材料在光催化产氢方面表现出卓越的性能,其中 rGO/NNO 的活性最高,在光照下的氢进化率(HER)达到 835 μmol g-1,这归功于最佳的界面效应。我们的实验和理论分析表明,制氢主要受材料界面上 A 位阳离子电荷密度的影响,这是由电荷转移动力学决定的。这项研究可能有助于理解和加强光催化过程在太阳能转换中的应用。
Tuning 2D perovskite–graphene layered composite for photocatalysis
The augmentation of photocatalytic activity in layered perovskite oxides via the integration of graphene-like materials presents a promising pathway for the optimization of solar energy conversion. The electron-rich nature of graphene, coupled with its high electron conductivity, functions as an effective photosensitizer, thereby enhancing visible light harvesting. In this investigation, we have, for the first time, assembled ultrathin exfoliated Dion–Jacobson perovskite layers with reduced graphene oxide (rGO) layers, resulting in a high surface area layered nanocomposite, achieved through a tailored electrostatic approach. To further refine the electron properties of the layered perovskite–reduced graphene oxide composites, we have explored the use of various lanthanides as A-site cations in the Dion–Jacobson perovskites, including LaNb2O7 (LNO), PrNb2O7 (PNO), and NdNb2O7 (NNO). The synthesized composites demonstrate exceptional performance in photocatalytic H2 production, with rGO/NNO exhibiting the highest activity, achieving a hydrogen evolution rate (HER) of 835 μmol g−1 under light illumination, attributable to optimal interfacial effects. Our experimental and theoretical analyses indicate that hydrogen production is predominantly influenced by the A-site cation charge density at the materials' interface, as dictated by the charge transfer dynamics. This research potentially contributes to the comprehension and enhancement of photocatalytic processes for applications in solar energy conversion.
期刊介绍:
Sustainable Energy & Fuels will publish research that contributes to the development of sustainable energy technologies with a particular emphasis on new and next-generation technologies.