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首页> 外文期刊>RSC Advances >Optimization of CdS@MoS2 core–shell nanorod arrays for an enhanced photo-response for photo-assisted electrochemical water splitting under solar light illumination
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Optimization of CdS@MoS2 core–shell nanorod arrays for an enhanced photo-response for photo-assisted electrochemical water splitting under solar light illumination

机译：CDS @ MOS2芯 - 壳纳米棒阵列的优化，用于增强光辅助电化学水分裂的增强光响应

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We prepared CdS@MoS _(2) core–shell nanorod arrays using a hydrothermal method and a subsequent electrodeposition. The well-defined physical features of the nanorod array of CdS@MoS _(2) provide both possibilities of a reverse biased P region and a forward biased N region. The preparation conditions (such as the hydrothermal reaction time, deposition time and precursor concentrations) were investigated to optimize the structures of the CdS@MoS _(2) core–shells, and thereafter to explore their effects on the photoelectrocatalytic activity. Specifically, the thickness of the MoS _(2) shell and the length of the CdS nanorods can be controlled through the deposition time, hydrothermal reaction time and precursor concentrations. The characterization results indicated that the structure of the CdS@MoS _(2) core–shell (length of the rods or layers of the shell) markedly influences the adsorption of light, and the separation and transfer of photogenerated charge carriers. Different proportions of MoS _(2) will result in different biased regions, in which a reverse bias will be beneficial for the photocatalytic activity, and a forward bias will have the opposite effect. The results indicated that a large portion of MoS _(2) will provide the great possibility of having a reverse biased P region under cathodic polarization, whereas, a large portion of CdS favors the reverse biased N region under anodic polarization. Herein, both of the reverse biased regions, either P or N, improve the photocatalytic activity. This investigation offers direct evidence of the effect of a CdS@MoS _(2) core–shell structure, when used as a photocathode, on improving the photo- and electrocatalytic activity, highlighting the importance of a more rational use of CdS/MoS _(2) cathodes toward achieving enhanced electrocatalytic activity through photo-assistance.
机译：我们使用水热法和随后的电沉积来制作CDS @ MOS _（2）核心壳纳米棒阵列。 CDS / MOS _（2）的纳米棒阵列的良好定义的物理特征提供了反向偏置的P区域和前向偏置N区域的两种可能性。研究了制备条件（例如水热反应时间，沉积时间和前体浓度）以优化Cds @ MOS _（2）核壳的结构，然后探讨它们对光电催化活性的影响。具体地，可以通过沉积时间，水热反应时间和前体浓度来控制MOS _（2）壳的厚度和CDS纳米棒的长度。表征结果表明CDS @ MOS _（2）芯壳的结构（壳体的杆或层的长度）显着影响光的吸附，以及光生电荷载体的分离和转移。不同比例的MOS _（2）将导致不同的偏置区​​域，其中反向偏压对于光催化活性是有益的，并且前偏压将具有相反的效果。结果表明，大部分MOS _（2）将提供在阴极偏振下具有反向偏置的P区域的极大可能性，而在阳极偏振下，大部分CDS有利于反向偏置的N区域。这里，反向偏置区域两种，无论是p或n，改善光催化活性。该研究提供了CDS @ MOS _（2）核壳结构的直接证据，当用作光电阴极时，在改善光电阴极，突出了更合理使用CDS / MOS _的重要性（2）通过光辅助达到增强电催化活动的阴极。

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