Green solvent for green materials: a supercritical hydrothermal method and shape-controlled synthesis of Cr-doped CeO2 nanoparticles
Green solvent for green materials: a supercritical hydrothermal method and shape-controlled synthesis of Cr-doped CeO2 nanoparticles
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绿色材料的绿色溶剂：Cr掺杂CeO2纳米颗粒的超临界水热法和形状控制合成
DOI：
10.1098/rsta.2015.0012
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Tadafumi Adschiri
中科院分区：
文献类型：
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作者：
Yuanzheng Zhu;Seiichi Takami;Gimyeong Seong;Mehdi Dejhosseini;Muhammad Zamir Hossain;Takio Noguchi;Daisuke Hojo;Nobuaki Aoki;Tsutomu Aida;Tadafumi Adschiri
本文介绍了一种绿色溶剂的超临界水热合成方法，以及基于该方法的产品，这些产品可以作为绿色材料，有助于解决环境问题。本文第一部分综述了该方法的基本原理，包括反应机理、超临界状态合成纳米颗粒的特点、连续流反应器及其应用；这对该方法合成绿色材料的适用性提供了更好的理解。论文的第二部分描述了合成掺杂cr的ceo_2纳米颗粒的方法，该纳米颗粒具有极高的储氧能力，表明其作为环境催化剂的潜力很大。透射电镜和扫描电镜图像显示八面体cr掺杂ceo_2纳米颗粒尺寸为15 ~ 30 nm，立方体cr掺杂ceo_2纳米颗粒尺寸为5 ~ 8 nm。采用高分辨率透射电子显微镜和选择区域电子衍射技术，测定了八面体cr掺杂ceo_2纳米颗粒暴露（111）面和立方cr掺杂ceo_2纳米颗粒暴露（100）面。由于Cr离子的半径小于Ce离子的半径，x射线衍射峰向大角度移动。
This paper describes a supercritical hydrothermal synthesis method as a green solvent process, along with products based on this method that can be used as green materials that contribute to solving environmental problems. The first part of this paper summarizes the basics of this method, including the mechanism of the reactions, specific features of the supercritical state for nanoparticle synthesis, the continuous flow-type reactor and applications; this provides a better understanding of the suitability of this method to synthesize green materials. The second part of the paper describes the method used to synthesize Cr-doped CeO2nanoparticles, which show an extremely high oxygen storage capacity, suggesting their high potential as an environmental catalyst. Transmission electron microscopy and scanning electron microscope images showed octahedral Cr-doped CeO2nanoparticles with sizes of 15–30 nm and cubic Cr-doped CeO2nanoparticles with sizes of 5–8 nm. Octahedral Cr-doped CeO2nanoparticles exposing (111) facets and cubic Cr-doped CeO2nanoparticles exposing (100) facets were determined by high-resolution transmission electron microscopy and selected area electron diffraction. The X-ray diffraction peaks shifted to a high angle because the radius of the Cr ion is smaller than that of the Ce ion.