Fabrication of well-shaped Sr2KTa5O15 nanorods with a tetragonal tungsten bronze structure by a flux method for artificial photosynthesis
Fabrication of well-shaped Sr2KTa5O15 nanorods with a tetragonal tungsten bronze structure by a flux method for artificial photosynthesis
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DOI：
10.1016/j.apcatb.2016.06.039
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发表时间：
2016-12-15
影响因子：
22.1
通讯作者：
Tanaka, Tsunehiro
中科院分区：
文献类型：
--
作者：
Huang, Zeal;Teramura, Kentaro;Tanaka, Tsunehiro
以氯化钾（KCl）为助熔剂，采用简易一锅法合成了具有四方钨青铜结构的Sr2KTa5O15纳米棒。与固相反应法（SSR）和聚合配合物法（PC）相比，只有通量法在相同的煅烧温度和时间下获得了纯净的纳米棒。Ag助催化剂制备的Sr2KTa5O15纳米棒在光催化CO2 - H2O转化过程中表现出较高的活性和良好的CO析出选择性。得到了O-2作为氧化产物以及CO和H-2作为还原产物的化学计量量，表明H2O在CO2的光催化转化中起到了电子给体的作用。在1173 K条件下制备的Sr2KTa5O15纳米棒在KCl通量与前驱体的质量比为1.0时，CO析出率最高（65.5 μ mol h(-1)）， CO析出选择性良好（88.7%）。(C) 2016 Elsevier B.V.版权所有
Sr2KTa5O15 nanorods with a tetragonal tungsten bronze structure were synthesized by a facile one-pot method using potassium chloride (KCl) as flux. Only the flux method obtained pure nanorods under the same calcination temperature and time comparing with that of solid-state reaction (SSR) and polymerized complex (PC) methods. The as-fabricated Sr2KTa5O15 nanorods with a Ag cocatalyst showed relatively high activity and good selectivity toward CO evolution in the photocatalytic conversion of CO2 by H2O. Stoichiometric amounts of O-2 as an oxidation product together with those of CO and H-2 as reduction products were obtained, indicating that H2O worked as an electron donor in the photocatalytic conversion of CO2. The Sr2KTa5O15 nanorods fabricated at 1173 K for 3 h in the mass ratio of KCl flux to precursors at 1.0 afforded the highest formation rate of CO evolution (65.5 mu mol h(-1)) and good selectivity toward CO evolution (88.7%). (C) 2016 Elsevier B.V. All rights reserved.