One-pot syntehisis of size-controllable core-shell CdS and derived CdS@ZnxCd1-xS structures for photocatalytic hydrogen production
One-pot syntehisis of size-controllable core-shell CdS and derived CdS@ZnxCd1-xS structures for photocatalytic hydrogen production
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一锅法合成尺寸可控的核壳 CdS 及其衍生的 CdS@ZnxCd1-xS 结构用于光催化制氢
DOI：
10.1002/chem.201703506
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Shenglin Xiong
中科院分区：
文献类型：
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作者：
Shuangshaung Kai;Baojuan Xi;Yifeng Wang;Shenglin Xiong
硫系化合物微/纳米复合结构在光催化制氢方面具有广阔的应用前景，引起了世界各国的广泛关注。具有显著性质的定义良好的微/纳米结构具有非常重要的意义。本文报道了一种简单的一锅法合成单分散、大小可控的Cd S核壳和Cd@Zn_xCd_1-−_xS核双壳亚微球的方法。首次选择性地制备了不同尺寸的硫化镉核-壳亚微球。通过对中间相随时间变化的电子显微镜观察，对生长机理进行了详细的研究。在合成体系中引入锌前驱体，通过与锌离子的阳离子交换，使硫化镉向外扩散，转变为−-xS微晶，制得了具有核-双层结构的亚微球--CDS@ZnxCd1−xs。电化学阻抗和暂态时间分辨光致发光光谱表明，在可见光下，由于电荷的有效分离，在−xS(5.17 h−1g−1)催化剂上的析氢速率是核壳结构(0.42 h−1g−1)的12.3倍。此外，在20 h的制氢过程中，Cd_s@Zn_xCd_1_−_xS核-双壳结构表现出良好的稳定性。
Chalcogenide micro/nanocomposite structures have been attracting worldwide attention due to prospective applications in photocatalytic hydrogen production. Well‐defined micro/nanostructures with pronounced properties are of extraordinary importance. Herein, a facile one‐pot method for the synthesis of monodisperse, size‐controllable CdS core–shell and CdS@ZnxCd1−xS core–double shell submicrospheres, which were engineered with respect to structure and size, is reported. CdS core–shell submicrospheres with different sizes were selectively prepared for the first time. The growth mechanism was investigated in detail by monitoring the time‐dependent morphology of intermediates by TEM. By introduction of a zinc precursor in the synthetic system, CdS@ZnxCd1−xS core–double shell submicrospheres were obtained by cation exchange of CdS with zinc ions, with a process of diffusion of CdS towards the outside and transformation of ZnxCd1−xS crystallites. The H2evolution rate over CdS@CdxZn1−xS (5.17 mmol h−1g−1) is 12.3 times that of CdS core–shell structures (0.42 mmol h−1g−1) under visible light, owing to the efficient charge separation, as demonstrated by electrochemical impedance and transient‐state time‐resolved photoluminescence spectroscopy. Furthermore, CdS@ZnxCd1−xS core–double shell structures exhibited excellent stability over 20 h of hydrogen production.