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首页> 外文期刊>RSC Advances >B-site modified photoferroic Cr3+-doped barium titanate nanoparticles: microwave-assisted hydrothermal synthesis, photocatalytic and electrochemical properties
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B-site modified photoferroic Cr3+-doped barium titanate nanoparticles: microwave-assisted hydrothermal synthesis, photocatalytic and electrochemical properties

机译：B-位点改性光反射式CR3 + - 滴钛酸钡纳米粒子：微波辅助水热合成，光催化和电化学性能

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摘要

We report on the synthesis of photoferroic Cr3+-doped BaTiO3 nanoparticles with nominal Cr content ranging from 2-8 mol% by a microwave-assisted hydrothermal method. The absorption properties of the doped systems are significantly enhanced due to the d-d band transition of Cr3+/4+. The structural properties of the materials are examined on the basis of lattice distortions given by the tolerance factor and microstrain. Raman scattering provides complementary information on the lattice vibrations indicating a softening of the longitudinal optic (LO) phonon mode located at 716 cm(-1) with increasing Cr concentration. The charge transport properties investigated through electrochemical impedance spectroscopy (EIS) demonstrate that there is a reduction in the charge transfer resistance from 5.2 omega to 4.3 omega for the undoped and 4 mol% Cr3+-doped respectively, which favors the degradation kinetics. The photo-oxidation ability of the systems is evaluated by time evolution of photodegradation of methyl orange under standardized solar irradiation. The experimental results confirm that the best photocatalytic performance is achieved with the 4 mol% Cr3+-doped BaTiO3 nanoparticles, which is similar to 2.7 times higher than for the undoped sample. Evidence of superoxide radical being the dominant active species is provided by in situ reactive oxide species (ROS) capture experiments.
机译：我们报道了通过微波辅助水热法测定了标称Cr含量的光反式Cr3 +掺杂BATIO3纳米颗粒的合成。由于CR3 + / 4 +的D-D带转换，掺杂系统的吸收性能显着提高。基于可容差因子和微陶器给出的晶格畸变来检查材料的结构性。拉曼散射提供有关晶格振动的互补信息，其表示位于716cm（-1）的纵向光学（LO）声子模式的软化，随着Cr浓度的增加。通过电化学阻抗光谱（EIS）研究的电荷传输性能证明了从5.2ω至4.3ω的电荷转移阻力降低，对于未掺杂的和4mol％CR3 + - 掺杂，其涉及降解动力学。通过标准化太阳照射下甲基橙的光降解的时间演化评估了系统的光氧化能力。实验结果证实，用4mol％Cr3 +掺杂的BATIO3纳米颗粒实现了最佳的光催化性能，其与未掺杂的样品相似的2.7倍。通过原位反应性氧化物物质（ROS）捕获实验提供了超氧化物自由基的证据。

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  • 来源
    《RSC Advances》 |2019年第36期|共12页
  • 作者

    Amaechi I. C.; Kolhatkar G.; Youssef A. Hadj; Rawach D.; Sun S.; Ruediger A.;

  • 作者单位

    Inst Natl Rech Sci Ctr Enegie Mat Telecommun INRS EMT 1650 Blvd Lionel Boulet Varennes PQ J3X 1S2 Canada;

    Inst Natl Rech Sci Ctr Enegie Mat Telecommun INRS EMT 1650 Blvd Lionel Boulet Varennes PQ J3X 1S2 Canada;

    Inst Natl Rech Sci Ctr Enegie Mat Telecommun INRS EMT 1650 Blvd Lionel Boulet Varennes PQ J3X 1S2 Canada;

    Univ Sherbrooke Fac Sci Dept Chim 2500 Blvd Univ Sherbrooke PQ J1K 2R1 Canada;

    Inst Natl Rech Sci Ctr Enegie Mat Telecommun INRS EMT 1650 Blvd Lionel Boulet Varennes PQ J3X 1S2 Canada;

    Inst Natl Rech Sci Ctr Enegie Mat Telecommun INRS EMT 1650 Blvd Lionel Boulet Varennes PQ J3X 1S2 Canada;

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  • 正文语种 eng
  • 中图分类 化学;
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