One-pot hydrothermal fabrication of layered β-Ni(OH)2/g-C3N4 nanohybrids for enhanced photocatalytic water splitting
One-pot hydrothermal fabrication of layered β-Ni(OH)2/g-C3N4 nanohybrids for enhanced photocatalytic water splitting
复制标题
DOI：
10.1016/j.apcatb.2016.04.048
复制
发表时间：
2016-10
影响因子：
22.1
通讯作者：
Junqing Yan;Huan Wu;Hong Chen;Liuqing Pang;Yunxia Zhang;R. Jiang;Landong Li;S. Liu
中科院分区：
文献类型：
--
作者：
Junqing Yan;Huan Wu;Hong Chen;Liuqing Pang;Yunxia Zhang;R. Jiang;Landong Li;S. Liu
二维材料的剥离和组装已被广泛研究，以开发其在催化，磁性和电子学等领域的性能，但是非常需要新的策略来缩短它们的制备周期并改善它们的环境友好性。本文介绍了一种简单、绿色的水热法制备层状β-Ni（OH）2/g-C3 N4纳米杂化材料的方法。与传统的剥离和组装分离不同，在无任何有机试剂的条件下，将二氯化镍和块状g-C3 N4水热处理12 h，即可实现g-C3 N4的剥离、β-Ni（OH）2的形成以及它们的自组装。此外，可以通过控制镍前体的浓度来调节β-Ni（OH）2纳米层的厚度。结果表明，所制备的纳米杂化物具有较强的组装相互作用，其中g-C3 N4具有光催化分解水的活性，而β-Ni（OH）2纳米膜具有加速水氧化的活性.在牺牲剂存在下，研究了它们的光催化分解水性能，发现β-Ni（OH）2纳米膜在剥离的g-C3 N4片层表面的组装，与未剥离的g-C3 N4相比，明显促进了电荷分离、水氧化动力学以及最终的光催化性能。在405 nm可见光照射下，也实现了水的直接裂解，其AQY为1.48%.本文介绍的一锅水热法可能是g-C3 N4，一个有前途的光催化分解水的材料，构建高效的太阳能转换复合系统基于其剥离的片层的替代策略。
Exfoliation and assembly of 2-D materials have been extensively investigated to exploit their performances in the area of catalysis, magnetics and electronics etc., but novel strategies are highly desired to shorten their preparing period and to improve their environment-friendliness. Here we introduce a simple and green hydrothermal process to fabricate ultrathin layered β-Ni(OH)2/g-C3N4nanohybrids for photocatalytic water splitting application. Different from conventionally separated exfoliation and assembly, the exfoliation of g-C3N4, formation of β-Ni(OH)2as well as their self-assembly can be one-pot achieved by simple hydrothermal treatment of nickel dichloride and bulk g-C3N4free of any organic agents for 12 h. Moreover, the thickness of β-Ni(OH)2nanolayer can be adjusted by controlling the concentration of nickel precursors. The as-obtained nanohybrids have been in detail characterized to have a strong interaction of the assembly components, among which the g-C3N4is active for photocatalytic water splitting, and β-Ni(OH)2nanolayer is efficient for acceleration of activation of water oxidation. Their photocatalytic water splitting performances are evaluated in the presence of sacrificial agents, based on which the assembly of β-Ni(OH)2nanolayers on the surface of exfoliated g-C3N4lamella is found to obviously promote the charge separation, water oxidation kinetics as well as final photocatalytic performances compared to the pristine g-C3N4. The direct water splitting is also achieved with the AQY of 1.48% under 405-nm visible light irradition. The one-pot hydrothermal method introduced here may be an alternative strategy for g-C3N4, a promising photocatalytic water splitting material, to construct highly efficient solar energy conversion composite systems based on its exfoliated lamella.