One-step gas-solid reaction synthesis of W@WS2 nanorattles and their novel catalytic activity.
One-step gas-solid reaction synthesis of W@WS2 nanorattles and their novel catalytic activity.
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DOI：
10.1039/c4nr03220a
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发表时间：
2014-10
期刊：
影响因子：
6.7
通讯作者：
Y. Wen;Haijun Zhang;Shaowei Zhang
中科院分区：
文献类型：
--
作者：
Y. Wen;Haijun Zhang;Shaowei Zhang
在750~950℃的H2/Ar气氛中，通过加热W_2O_3纳米颗粒和S的混合物，合成了W@WS_2纳米颗粒。除温度外，H2还原反应和S硫化副反应之间的竞争控制了反应机理和最终产物的形貌。在此基础上，通过简单地调整工艺参数，可以选择性地制备出多种类型的纳米结构，包括WS2纳米薄片、无机富勒烯类纳米颗粒和W@WS2纳米颗粒(具有理想的核心尺寸和壳层厚度)。此外，首次发现所制备的W@WS2纳米催化剂具有优异的催化活性，接近甚至超过了更舒适的Au基催化剂。
W@WS2 nanorattles were synthesised by heating a mixture of WO3 nanoparticles and S at a relatively low temperature between 750 and 950 °C in H2/Ar. In addition to the temperature, the competition between the H2 reduction and the S sulphidation sub-reactions dominated the reaction mechanisms and the morphologies of final products. Based on this, several types of nanostructures, including WS2 nanoflakes, inorganic fullerene-like nanoparticles and W@WS2 nanorattles (with desirable core size and shell thickness), could be selectively prepared by simply tailoring the processing parameters. Moreover, it was found for the first time that as-prepared W@WS2 nanorattles exhibited excellent catalytic activities which were close to or even better than their much more costive Au-based counterparts.