One-pot Synthesis of CdS Nanocrystals Hybridized with Single-Layer Transition-Metal Dichalcogenide Nanosheets for Efficient Photocatalytic Hydrogen Evolution
One-pot Synthesis of CdS Nanocrystals Hybridized with Single-Layer Transition-Metal Dichalcogenide Nanosheets for Efficient Photocatalytic Hydrogen Evolution
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DOI：
10.1002/anie.201410172
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发表时间：
2015-01-19
影响因子：
16.6
通讯作者：
Zhang, Hua
中科院分区：
文献类型：
--
作者：
Chen, Junze;Wu, Xue-Jun;Zhang, Hua
开发低成本、富含稀土的高效太阳能光催化分解水催化剂具有重要意义。尽管过渡金属二卤代化合物(TMDs)作为析氢反应(HER)的助催化剂表现出优异的性能，但设计具有丰富活性中心的TMD杂化光催化剂仍然是一个挑战。本文提出了一种简便的一锅法湿化学法制备MS2-CDS(M=W或Mo)纳米杂化材料。令人惊讶的是，在所得到的纳米杂化材料中，横向尺寸为4-10 nm的单层MS2纳米片选择性地生长在纤锌矿纳米晶的(0001)面。这些MS2-CDS纳米杂化材料在MS2层具有大量的边缘中心，这些边缘中心是HER的活性中心。在可见光(>；420 nm)照射下，WS2-CDS和MoS2-CDS纳米杂化材料对HER的光催化性能分别是纯CDS的16倍和12倍。重要的是，经过长时间的测试(16h)，MS2-CDS纳米杂化材料的稳定性得到了提高，仍然保持了70%的催化活性。
Exploration of low-cost and earth-abundant photocatalysts for highly efficient solar photocatalytic water splitting is of great importance. Although transition-metal dichalcogenides (TMDs) showed outstanding performance as co-catalysts for the hydrogen evolution reaction (HER), designing TMD-hybridized photocatalysts with abundant active sites for the HER still remains challenge. Here, a facile one-pot wet-chemical method is developed to prepare MS2-CdS (M=W or Mo) nanohybrids. Surprisedly, in the obtained nanohybrids, single-layer MS2 nanosheets with lateral size of 4-10nm selectively grow on the Cd-rich (0001) surface of wurtzite CdS nanocrystals. These MS2-CdS nanohybrids possess a large number of edge sites in the MS2 layers, which are active sites for the HER. The photocatalytic performances of WS2-CdS and MoS2-CdS nanohybrids towards the HER under visible light irradiation (>420nm) are about 16 and 12times that of pure CdS, respectively. Importantly, the MS2-CdS nanohybrids showed enhanced stability after a long-time test (16h), and 70% of catalytic activity still remained.