SCHEDULED MAINTENANCE
Ultrasonic-assisted synthesis of carbon nanotube supported bimetallic Pt–Ru nanoparticles for effective methanol oxidation†
Abstract
In this paper, we demonstrate a facile and one-step ultrasonic method to synthesize a carboxylate functionalized multi-walled carbon nanotube supported bimetallic platinum ruthenium nanoparticle (Pt–Ru/c-MWNT) catalyst. The results show that the atomic Pt–Ru ratio is approximately 1 : 1, and the Pt mass loading in the catalyst is 8%. In addition, Pt–Ru nanoparticles with bimetallic structure, ultrasmall size (1.9 nm), and uniform distribution were well-dispersed onto the surface of c-MWNTs, which exhibit enhanced electrocatalytic performance toward methanol oxidation. It is found that this catalyst has a much higher electrochemically active surface area (ECSA) (133.2 m2 gPt−1) and current density for methanol oxidation (1236.0 mA mgPt−1) than those of commercial Pt/C (20 wt%) (55.6 m2 gPt−1, 214.2 mA mgPt−1). Furthermore, the oxidation current density of the Pt–Ru/c-MWNT catalyst at 10 000 s is 22.5 mA mgPt−1, which indicates a long-term high electrocatalytic activity of the Pt–Ru/c-MWNT catalyst for methanol oxidation in acid media.
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