期刊
MATERIALS
卷 14, 期 24, 页码 -出版社
MDPI
DOI: 10.3390/ma14247716
关键词
carbon nanospheres; tungsten carbide; carbon-tungsten composites; nitrogen-doped electro-catalysts; oxygen reduction reaction
类别
资金
- Junta de Andalucia [RNM172, P18-RTJ-2974]
This work demonstrates the preparation of carbon nanospheres with a high nitrogen content using a simple hydrothermal method. The presence of tungsten nanophases significantly improves the electro-catalytic behavior in the ORR. The synergy between tungsten carbide and other electro-catalytic metals in this reaction requires further evaluation.
This work shows the preparation of carbon nanospheres with a high superficial nitrogen content (7 wt.%), obtained by a simple hydrothermal method, from pyrocatechol and formaldehyde, around which tungsten nanophases have been formed. One of these nanophases is tungsten carbide, whose electro-catalytic behavior in the ORR has been evaluated together with the presence of nitrogen surface groups. Both current and potential kinetic density values improve considerably with the presence of tungsten, despite the significant nitrogen loss detected during the carbonization treatment. However, the synergetic effect that the WC has with other electro-catalytic metals in this reaction cannot be easily evaluated with the nitrogen in these materials, since both contents vary in opposite ways. Nevertheless, all the prepared materials carried out oxygen electro-reduction by a mixed pathway of two and four electrons, showing remarkable electro-catalytic behavior.
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