Tiny Au nanoparticles mediation strategy for preparation of NIR CuInS2 QDs based 1D TiO2 hybrid photoelectrode with enhanced photocatalytic activity
Tiny Au nanoparticles mediation strategy for preparation of NIR CuInS2 QDs based 1D TiO2 hybrid photoelectrode with enhanced photocatalytic activity
复制标题
微小金纳米颗粒介导策略制备具有增强光催化活性的基于近红外 CuInS2 量子点的一维 TiO2 混合光电极
DOI：
10.1016/j.mssp.2019.04.021
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发表时间：
2019-08-15
影响因子：
4.1
通讯作者：
Li, Songtian
中科院分区：
文献类型：
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作者：
Li, Weili;Yao, Lu;Li, Songtian
硫化铜铟（CuInS2）作为一种绿色光吸收材料越来越受到人们的关注；然而，由于其高缺陷耐受性导致严重的载流子复合，单独的 CuInS2 表现出较差的光催化活性 - 特别是对于具有高体积与表面比的量子点（QD）。为了缓解这个问题，通过将微小的金纳米颗粒（NP）原位光还原沉积到负载有近红外（NIR）CuInS2量子点的独立式TiO2/Ti纳米线阵列（NWA）上，成功制备了三元II型异质结构混合光电极。这种结构使得 CuInS2 QD 能够充当光敏剂，其光捕获区域延伸至 800 nm，而微小的 Au NP 则充当光催化反应引发剂，以增强有机分子的分解。最重要的是，使用 TiO2/Ti NWA 作为支撑基底不仅为高负载和分散的催化剂提供了更多的位点，而且还为离子、质量扩散和光生载流子传输保留了一维空间。正如预期的那样，结果表明，与 CuInS2 /TiO2 NWA 相比，Au NPs (CuInS2/Au/TiO2 NWAs) 的光电流强度增加了 65.2%。光照射180 min后苯酚降解效率为94.3%，明显高于其他对照光电极。最后，卓越的性能还得益于通过我们提出的策略创建的不同组件之间的紧密接触界面。使用对苯二甲酸（TA）作为探针分子的光致发光（PL）技术证实，基于高活性羟基自由基的光催化机制也是如此显着的光催化效率的原因。
Copper indium sulfide (CuInS2) is attracting growing attention as a green, photo-absorption material; yet CuInS2 alone displays poor photocatalytic activity owing to the severe charge carrier recombination resulting from its high defect tolerability - especially for quantum dots (QDs) with the high volume-to-surface ratio. In an attempt to mitigate this issue, a ternary type II heterostructure hybrid photoelectrode was successfully prepared through in situ photoreduction deposition of tiny Au nanoparticles (NPs) onto free-standing TiO2/Ti nanowire arrays (NWAs) loaded with near-infrared (NIR) CuInS2 QDs. This configuration permits CuInS2 QDs to act as a photosensitizer with a light harvest region extending 800 nm, while tiny Au NPs function as photocatalytic reaction initiators to enhance organic molecule decomposition. Most importantly, using TiO2/Ti NWAs as the supporting substrate not only provides considerably more sites for highly loaded and dispersed catalysts, but also reserves one dimension space for ions, mass diffusion, and photo-generation charge carrier transport. As expected, the results showed that incorporation of Au NPs (CuInS2/Au/TiO2 NWAs) increased photocurrent intensity by 65.2% compared with CuInS2 /TiO2 NWAs. What's more, the phenol degradation efficiency was 94.3% after 180 min of light irradiation, which is significantly higher than that of other control photoelectrodes. Finally, the superior performance also benefits from the intimate contact interface between different components created through our proposed strategy. A photoluminescence (PL) technique, using terephthalic acid (TA) as the probe molecule, confirmed that a highly reactive hydroxyl radical based photocatalytic mechanism is also responsible for such significant photocatalytic efficiency.