Visible light responsive La and Fe co-doped NaTaO3 photocatalysts: Local structure around dopants
Visible light responsive La and Fe co-doped NaTaO3 photocatalysts: Local structure around dopants
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DOI：
10.1016/j.chemphys.2019.110648
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发表时间：
2020-03-01
期刊：
影响因子：
2.3
通讯作者：
Onishi, Hiroshi
中科院分区：
文献类型：
--
作者：
Sudrajat, Hanggara;Ichikuni, Nobuyuki;Onishi, Hiroshi
双掺杂La和过渡金属阳离子的NaTaO 3在可见光下光催化分解水方面具有重要意义。然而，目前还没有令人信服的证据提出一个合理的结构掺入NaTaO 3主机的掺杂剂对。在这项研究中，作出努力，以揭示本地结构的La和Fe阳离子掺杂在NaTaO 3。为此，我们采用了X射线吸收光谱，包括扩展的X射线吸收精细结构和X射线吸收近边结构。结果表明，双掺杂后，La阳离子占据Na-位，而Fe阳离子占据Ta-位。因此，形成LaFeO 3-NaTaO 3固溶体，并伴随有微量的氧化铁杂质。该固溶体能够吸收可见光以产生电子。火山形图案的电子人口相对于掺杂剂浓度，其中2 + 2摩尔%给出了最高的电子人口。
NaTaO3 doubly doped with La and transition metal cations has been of interest for photocatalytic water splitting under visible light. However, there is not yet convincing evidence to propose a plausible structure for the dopant pair incorporated in the NaTaO3 host. In this study, efforts were made to reveal the local structure of La and Fe cations doped in NaTaO3. For this purpose, we employed X-ray absorption spectroscopy, including extended X-ray absorption fine structure and X-ray absorption near-edge structure. It was revealed that upon double doping, La cations occupied the Na-sites, whereas Fe cations occupied the Ta-sites. A LaFeO3-NaTaO3 solid solution was formed accordingly, together with a trace amount of iron oxide impurities. The solid solution was able to absorb visible light to produce electrons. A volcano-shaped pattern of the electron population with respect to the dopant concentration was present, in which 2 + 2 mol% gave the highest electron population.