Simultaneous nanostructure and heterojunction engineering of graphitic carbon nitride via in situ Ag doping for enhanced photoelectrochemical activity
Simultaneous nanostructure and heterojunction engineering of graphitic carbon nitride via in situ Ag doping for enhanced photoelectrochemical activity
复制标题
通过原位银掺杂同时进行石墨碳氮化物的纳米结构和异质结工程以增强光电化学活性
DOI：
10.1016/j.apcatb.2014.08.023
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发表时间：
2015-02-01
影响因子：
22.1
通讯作者：
Chu, P. K.
中科院分区：
文献类型：
--
作者：
Hu, S. W.;Yang, L. W.;Chu, P. K.
以AgNO 3为多功能改性剂，在三聚氰胺和少层MoS 2的热聚合过程中，采用一锅法制备了由g-C3 N4纳米片、金属银和MoS 2纳米片组成的新型介孔三元光催化剂。来自AgNO 3的气泡形成一个额外的软模板，以原位改变三聚氰胺的聚合行为，产生薄的g-C3 N4纳米片和大的多孔结构，表现出增强的光吸收。基于溶液的软化学合成使得能够在g-C3 N4纳米片中均匀地包含金属银，并且在所获得的纳米复合材料中高度地包含纳米MoS 2纳米片。金属银与g-C3 N4纳米片的原位耦合产生了纳米尺度的Mott-Schottky效应，为电荷分离和转移提供了有效的通道，并调谐了后者的能带。更重要的是，g-C3 N4纳米片的调制能带协同加速了二维g-C3 N4/MoS 2异质结界面处光生电子-空穴对的分离和转移。结果表明，与其他参比材料相比，该三元纳米复合材料在模拟太阳光照射下表现出更好的光电化学性能和光催化活性。我们的研究结果为半导体光催化剂的设计和大规模生产提供了新的见解。(C)2014爱思唯尔有限公司版权所有。
A novel mesoporous ternary photocatalyst consisting of g-C3N4 nanosheets, metallic silver and MoS2 nanosheets is prepared using AgNO3 as a multifunctional modifier during thermal polymerization of melamine and few-layer MoS2 in a simple one-pot process. The gas bubbles from AgNO3 form an extra soft templates to in situ alter the polymerization behavior of melamine, creating thin g-C3N4 nanosheets and large porous structure that exhibit enhanced light absorption. The solution-based, soft-chemical synthesis enables homogeneous inclusion of metallic silver in the g-C3N4 nanosheets and high dispersibility of ultrathin MoS2 nanosheets in the obtained nanocomposite. In situ coupling between metallic silver and g-C3N4 nanosheets produces nanoscale Mott-Schottky effect, provides an effective channel for charge separation and transfer, and tunes energy band of the latter. More importantly, modulated energy band of g-C3N4 nanosheets synergistically expedites the separation and transfer of photogenerated electron-hole pairs at the interface of two-dimensional g-C3N4/MoS2 heterojunction. As a result, the ternary nanocomposite exhibits improved photoelectrochemical performance and photocatalytic activity under simulated sunlight irradiation compared with other reference materials. Our results provide new insights into the design and large-scale production of semiconductor photocatalyst. (C) 2014 Elsevier B.V. All rights reserved.