Surface localization of CdZnS quantum dots onto 2D g-C3N4 ultrathin microribbons: Highly efficient visible light-induced H2-generation
Surface localization of CdZnS quantum dots onto 2D g-C3N4 ultrathin microribbons: Highly efficient visible light-induced H2-generation
复制标题
CdZnS 量子点在 2D g-C3N4 超薄微带上的表面局域化：高效可见光诱导氢气生成
DOI：
10.1016/j.nanoen.2016.05.031
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发表时间：
2016-08-01
期刊：
影响因子：
17.6
通讯作者：
Hu, Changwen
中科院分区：
文献类型：
--
作者：
Yao, Lihua;Wei, Ding;Hu, Changwen
构建高效裂解水的新型半导体光催化剂，对发展可持续、清洁的氢能起到了重要作用。本工作采用原位生长的方法，在二维碳氮化碳(g-C3N4)超薄微米带(厚度约4 nm)上组装了0-DCd0.5Zn0.5S量子点(量子点，尺寸约5 nm)，制备了新型的微/纳米杂化材料。在没有任何贵金属助催化剂的情况下，C3N4的可见光驱动氢气产生速率最高，为33.41mmolh(-)1g(-1)，450 nm处的表观量子效率为46.65%。这样的氢气生成速率比原始的g-C3N4和Cd0.5Zn0.5S分别高27.39倍和9.18倍，与目前报道的大多数无贵金属半导体催化剂相比有显著的提高。此外，与纯的Cd0.5Zn0.5S相比，其光催化稳定性有了很大的提高。氢气产生性能的提高可以归因于g-C3N4界面上两个组分之间匹配良好的能级和强烈的电子耦合以及增强的可见光吸收。在g-C_3N_4超薄微带上均匀分散的Cd_(0.5)Zn_(0.5)S量子点也有利于抑制Cd_(0.5)Zn_(0.5)S的电子-空穴复合。因此，这项工作为获得高效可见光诱导氢气产生的二维微/纳米结构提供了有效的途径。(C)2016爱思唯尔有限公司。保留所有权利。
The construction of new semiconductor photocatalysts toward high-efficiency splitting water has played an important role in developing sustainable and clean hydrogen energy. In this work, new type of micro/nano-sized hybrids were synthesized based on the assembly of 0D Cd0.5Zn0.5S quantum dots (QDs, size: ca. 5 nm) onto 2D graphitic carbon nitride (g-C3N4) ultrathin microribbons (thickness: ca. 4 nm) via an in-situ growth hydrothermal method. The Cd0.5Zn0.5S 32 wt%@C3N4 composite exhibits the highest visible-light-driven H-2-generation rate of 33.41 mmol h(-)1 g(-1) without any noble-metal as cocatalyst, and the apparent quantum efficiency is 46.65% at 450 nm. Such H-2-generation rate is higher than the pristine g-C3N4 and Cd0.5Zn0.5S by a factor of 27.39 and 9.18 respectively, which is significantly enhanced compared with most as-reported noble-metal-free semiconductor catalysts to date. In addition, compared with the pristine Cd0.5Zn0.5S, the photocatalytical stability of Cd0.5Zn0.5S QDs@C3N4 is highly improved. The enhanced H-2-generation performance can be attributed to the well-matched energy level and strong electronic coupling between two components at the g-C3N4 interface as well as enhanced visible-light absorption. The uniform dispersion of Cd0.5Zn0.5S QDs onto the g-C3N4 ultrathin micro ribbons also facilitates the depression of electron-hole recombination from potential aggregation of Cd0.5Zn0.5S. Therefore, this work supplies an effective way to obtain promising 2D micro/nanostructures for high-efficiency visible light-induced H2-generation. (C) 2016 Elsevier Ltd. All rights reserved.