Photocatalytic Reduction of CO(2) by ZnO Micro/nanomaterials with Different Morphologies and Ratios of {0001} Facets.
Photocatalytic Reduction of CO(2) by ZnO Micro/nanomaterials with Different Morphologies and Ratios of {0001} Facets.
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不同形貌和{0001}面比例的ZnO微纳米材料光催化还原CO2
DOI：
10.1038/srep38474
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发表时间：
2016-12-06
影响因子：
4.6
通讯作者：
Ji X
中科院分区：
文献类型：
--
作者：
Liu X;Ye L;Liu S;Li Y;Ji X
在蒸馏水-乙醇混合介质中，用方便的溶剂热法成功地合成了氧化锌微球、氧化锌微花和氧化锌纳米棒。用X射线衍射仪、扫描电子显微镜、透射电子显微镜、高分辨电子显微镜、X射线光电子能谱、比表面积和紫外可见光谱对所制备的氧化锌微纳米材料进行了表征。通过改变蒸馏水和乙醇的体积比，可以控制氧化锌微/纳米材料的形貌和外露表面，并对其形成机理进行了探讨。此外，还考察了氧化锌样品对CO2光还原为CO的光催化活性。结果表明，与氧化锌微球和氧化锌微花(分别为3.357和1.627μmolg−1h−1)相比，具有高比表面积和高比表面的氧化锌纳米棒具有更高的CO生成速率(3.814μmolg−1h−1)。这一结果不仅可以为研究氧化锌表面{0001}面对二氧化碳光还原活性的影响提供重要的依据，也为通过调整氧化锌微纳米材料的表面结构来调节二氧化碳光还原性能提供了一种策略。
ZnO microspheres, ZnO microflowers and ZnO nanorods are successfully synthesized via a convenient solvothermal method in distilled water-ethanol mixed medium. The as-prepared ZnO micro/nanomaterials are characterized by XRD, SEM, TEM, HRTEM, XPS, BET, and UV-Vis. The morphologies and exposed facets of the ZnO micro/nanomaterials can be controlled by simply changing the volume ratio of distilled water to ethanol, and their formation mechanisms are also proposed. In addition, the photocatalytic activities of the ZnO samples are investigated towards the photoreduction of CO2 to CO. It is found that ZnO nanorods with high ratio of {0001} facets and large surface areas possess higher CO formation rate (3.814 μmol g−1 h−1) in comparison with ZnO microspheres and ZnO microflowers (3.357 and 1.627 μmol g−1 h−1, respectively). The results can not only provide an important indication about the influence of the {0001} facets on the activity of CO2 photoreduction over ZnO, but also demonstrate a strategy for tuning the CO2 photoreduction performance by tailoring the surface structures of ZnO micro/nanomaterials.
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