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首页> 外文期刊>Chemistry: A European journal >ZnO/ZnS Heterostructured Nanorod Arrays and Their Efficient Photocatalytic Hydrogen Evolution
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ZnO/ZnS Heterostructured Nanorod Arrays and Their Efficient Photocatalytic Hydrogen Evolution

机译：ZnO / ZnS异质结构纳米棒阵列及其有效的光催化氢释放

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Semiconducting heterostructures have been widely applied in photocatalytic hydrogen evolution due to their variable band gaps and high energy conversion efficiency. As typical semiconducting heterostructures, ZnO/ZnS heterostructured nanorod arrays (HNRAs) have been obtained through a simple anion-exchange process in this work. Structural characterization indicates that the heterostructured nanorods (HNRs) are all composed of hexagonal wurtzite ZnO core and cubic zinc-blende ZnS shell. As expected, the as-obtained one-dimensional heterostructures not only lower the energy barrier but also enhance the separation ability of photogenerated carriers in photocatalytic hydrogen evolution. Through comparisons, it is found that 1D ZnO/ZnS HNRAs exhibit much better performance in photocatalytic hydrogen evolution than 1D ZnO nanorod arrays (NRAs) and 1D ZnS NRAs. The maximum H-2 production is 19.2mmolh(-1) for 0.05g catalyst under solar-simulated light irradiation at 25 degrees C and the corresponding quantum efficiency is 13.9%, which goes beyond the economical threshold of photocatalytic hydrogen evolution technology.
机译：半导体异质结构因其可变的带隙和高的能量转换效率而被广泛应用于光催化制氢。作为典型的半导体异质结构，在这项工作中，通过简单的阴离子交换过程获得了ZnO / ZnS异质结构纳米棒阵列（HNRAs）。结构表征表明，异质结构纳米棒（HNRs）均由六方纤锌矿型ZnO核和立方锌共混型ZnS壳组成。如所预期的，所获得的一维异质结构不仅降低了能垒，而且还增强了光催化载氢中光生载流子的分离能力。通过比较发现，一维ZnO / ZnS HNRAs在光催化制氢方面表现出比一维ZnO纳米棒阵列（NRA）和一维ZnS NRA更好的性能。在25°C的太阳模拟光照射下，0.05g催化剂的最大H-2产量为19.2mmolh（-1），相应的量子效率为13.9％，超过了光催化制氢技术的经济阈值。

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