Enhanced electrochemical hydrogen evolution over defect-induced hybrid MoO3/Mo3O9•H2O microrods
Enhanced electrochemical hydrogen evolution over defect-induced hybrid MoO3/Mo3O9•H2O microrods
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DOI：
10.1016/j.apsusc.2018.11.050
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发表时间：
2019-03-01
影响因子：
6.7
通讯作者：
Sohn, Youngku
中科院分区：
文献类型：
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作者：
Gu, Ja In;Lee, Jisuk;Sohn, Youngku
金属氧化物的缺陷表面改性和两个晶相的杂化是通过创造更多活性位点来提高催化性能的好策略。本文通过水热法合成了MoO3、Mo3O9中心点H2O及其杂化微棒，并通过后水热处理制备了相应的缺陷诱导结构。通过扫描电子显微镜、高分辨率透射电子显微镜、X射线衍射晶体学、傅里叶变换红外光谱、拉曼、紫外-可见吸收光谱、光致发光和X射线光电子能谱充分阐明了其基本理化性质。结果表明，与其他结构相比，缺陷诱导杂化 MoO3/Mo3O9 中心点 H2O 微棒的析氢反应 (HER) 活性显着增强了 100 倍。根据实验结果，诱导缺陷、Mo5+和Mo6+的耦合氧化态以及杂化物在增强中发挥着至关重要的作用。目前杂化结构中的缺陷修饰可能是提高各种催化剂应用领域中催化活性的非常有用的策略。
Defected surface modification of metal oxides and hybridization of two crystal phases have been a good strategy of improving a catalytic performance by creating more active sites. Herein, MoO3, Mo3O9 center dot H2O and their hybrid microrods were synthesized by the hydrothermal method, and the corresponding defect induced structures were prepared by the post hydrothermal treatment. The fundamental physiochemical properties were fully elucidated by scanning electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction crystallography, Fourier transform infrared spectroscopy, Raman, UV-visible absorption spectroscopy, photoluminescence, and X-ray photoelectron spectroscopy. It was demonstrated that the hydrogen evolution reaction (HER) activity of the defect-induced hybrid MoO3/Mo3O9 center dot H2O microrods was dramatically enhanced by 100 x, compared with other structures. On the basis of the experimental results, induced defects, coupled oxidation states of Mo5+ and Mo6+, and the hybrids were shown to play crucial roles in the enhancement. The present defect modification in the hybrid structure could be a very useful strategy of improving catalytic activity in various catalyst application fields.