Preparation and performance of nanosized tungsten carbides for electrocatalysis

• Published in: Electrochimica acta 2010-11, Vol.55 (27), p.7969-7974
• Main Authors: Shen, Pei Kang, Yin, Shibin, Li, Zihui, Chen, Chan
• Format: Article
• Language: English
• Subjects: Chemistry; Continuous microwave heating; Electrocatalysts; Electrochemistry; Electrodes: preparations and properties; Exact sciences and technology; General and physical chemistry; Heating; Intermittent microwave heating; Methanol oxidation; Microwaves; Nanocomposites; Nanomaterials; Nanostructure; Other electrodes; Oxygen reduction; Platinum; Tungsten carbide; Tungsten carbides
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2010.03.025

The principle of the intermittent microwave heating (IMH) method and the details on the working procedure for prepare nanosized materials were presented along with the comparison to the traditional continuous microwave heating (CMH) method. The nanosized tungsten carbides were synthesized as an example by this novel method. It produced WC with the average particle size of 21.4 nm at the procedure of 15 s-on and 15 s-off for 20 times, however, the particle size increased to 35.7 nm by CMH method for 5 min. The pure WC was obtained by post-treating the sample in NaOH solution, which gave the better performance as support. The nanosized WC was used as support for the Pt nanoparticles (Pt–WC/C(IMH)) for alcohol oxidation and oxygen reduction. It was proved that the Pt–WC/C(IMH) electrocatalysts gave the better performance than that prepared by CMH method (Pt–WC/C(CMH)) or Pt/C electrocatalysts in terms of the activity and CO-tolerance. The intermittent microwave heating method is easier to scale-up for mass production of the nanosized tungsten carbides and other nanosized materials as well.