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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Effects of crystalline phase and morphology on the visible light photocatalytic H_2-production activity of CdS nanocrystals
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Effects of crystalline phase and morphology on the visible light photocatalytic H_2-production activity of CdS nanocrystals

机译：晶相和形态对CdS纳米晶体可见光光催化H_2产生活性的影响

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Visible light photocatalytic H_2-production from aqueous solutions is of great importance for its potential application in converting solar energy into chemical energy. In this study, a series of CdS nanostructures with different contents of wurtzite (WZ) and zinc blende (ZB) phases were successfully synthesized by a simple solvothermal route in an ethylenediamine and ethylene glycol mixed solution. The solvent volume ratio of ethylenediamine in the mixed solution (R) exhibited an obvious influence on the crystalline phase and morphology of the resulting CdS products. With increasing R, the percentage of wurtzite first increased and then decreased, whilst the morphology changed from nanoparticles to multi-armed nanorods, and finally to long rods and sheets. The prepared multi-armed CdS nanorod samples showed especially high and stable photocatalytic H_2-production activity with Pt (0.25 wt%) as a co-catalyst and lactic acid aqueous solution as a sacrificial reagent under visible light irradiation. The optimized CdS nanorods with the highest percentage (64%) of the WZ phase exhibited a high H_2-production rate of 231.4 μmol h~(?1) (about 16.6 times higher than that of CdS nanoparticles with a low percentage (38.4%) of WZ CdS) and with a quantum efficiency (QE) of 28% at 420 nm. This high photocatalytic H_2-production activity could be attributed to the results of the positive synergistic effects of the hexagonal WZ phase and morphology of multi-armed nanorods.
机译：从水溶液中可见光光催化生产H_2对于将其潜在地应用于将太阳能转化为化学能具有重要意义。在这项研究中，通过乙二胺和乙二醇混合溶液的简单溶剂热法成功合成了一系列不同含量的纤锌矿（WZ）和锌共混物（ZB）的CdS纳米结构。乙二胺在混合溶液（R）中的溶剂体积比对所得CdS产物的结晶相和形态有明显影响。随着R的增加，纤锌矿的百分比先增加然后减少，而形态从纳米粒子变为多臂纳米棒，最后变为长棒和片。制备的多臂CdS纳米棒样品在可见光照射下表现出特别高和稳定的光催化H_2生成活性，其中Pt（0.25 wt％）作为助催化剂，乳酸水溶液作为牺牲试剂。 WZ相百分比最高（64％）的优化CdS纳米棒表现出高的H_2生成率231.4μmolh〜（？1）（比低百分比（38.4％）的CdS纳米粒子的高16.6倍（WZ CdS）的量子效率（QE）在420 nm下为28％。这种高的光催化H_2产生活性可以归因于六角形WZ相和多臂纳米棒形态的正协同效应。

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