|
篇目详细内容 |
|
【篇名】 |
Synthesis of tungsten carbide nanocrystals and their electrochemical properties |
|
【刊名】 |
Frontiers of Chemistry in China |
|
【刊名缩写】 |
Front. Chem. China |
|
【ISSN】 |
1673-3495 |
|
【EISSN】 |
1673-3614 |
|
【DOI】 |
10.1007/s11458-009-0030-y |
|
【出版社】 |
Higher Education Press and Springer-Verlag |
|
【出版年】 |
2009 |
|
【卷期】 |
4
卷2期 |
|
【页码】 |
127-131
页,共
5
页 |
|
【作者】 |
Jianghua ZENG;
Dingsheng YUAN;
Yingliang LIU;
Jingxing CHEN;
Sanxiang TAN;
|
|
【关键词】 |
solvothermal method; nanocrystal; tungsten carbide; electrocatalysis; oxygen reduction reaction |
【摘要】 |
|
Tungsten carbide (WC) nanocrystals have been prepared by a solvothermal method with Mg as the reductant and WO3 and anhydrous ethanol as the precursors. The effects of time and temperature on the synthesis of WC were investigated and a probable formation mechanism was discussed. The obtained WC nanocrystals were characterized by X-ray diffraction, transmission electron microscopy, energy dispersive spectroscopy and electrochemical methods. Hexagonal close-packed WC was successfully synthesized when the temperature was as low as 500°C. The content of carbon was more than that of W, indicating that the composition of the treated sample was C and WC only. The diameters of WC nanocrystals were ranged from 40nm to 70nm and the nanocrystals were dispersed on carbon films. The electrochemical measurements reveal that WC nanocrystals obviously promote Pt/C electrocatalytic ability for the oxygen reduction reaction. |
