Small-Sized Tungsten Nitride Particles Strongly Anchored on Carbon Nanotubes and their Use as Supports for Pt for Methanol Electro-oxidation
作者： Yuan Liu , Haijing Yan , Xiaoguang Zhou , Mingxia Li , Honggang Fu
关键词: Chemical engineering 、 Dispersion (chemistry) 、 Carbon nanotube 、 Chemistry 、 Tungsten nitride 、 Nanotechnology 、 Calcination 、 Nanoparticle 、 Grinding 、 Nanocomposite 、 Electrocatalyst
摘要: The anchoring of small-sized WN (tungsten nitride) nanoparticles (NPs) with good dispersion on carbon nanotubes (CNTs) offers an effective means obtaining promising materials for use in electrocatalysis. Herein, method based grinding treatment followed by a nitridation process is proposed to realize this goal. In the synthesis, solution containing H4[SiO4(W3O9)4] (SiW12) and CNTs modified polyethylenimine (PEI-CNTs) was ground dryness. Small-sized NPs were anchored onto after calcination under NH3. Under hydrothermal assembly conditions (absence grinding), particles larger size inferior obtained, demonstrating important role process. benefit has been demonstrated using WN/CNTs as support Pt catalyze methanol electro-oxidation reaction. mass activity Pt-WN/CNTs-G-70 (where G denotes treatment, 70 loading amount (%) WN/CNTs) evaluated about 817 mA mg−1Pt, better that those commercial Pt/C (340 mA mg−1Pt) Pt/CNTs (162 mA mg−1Pt). Pt-WN/CNTs-G also displayed CO tolerance. contrast, Pt-WN/CNTs prepared without 344 mA mg−1Pt, verifying key preparation co-catalytic effect.
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