用于直接甲醇燃料电池的高活性PtCo-CNT@TiO_2复合纳米阳极催化剂

采用溶胶凝胶法制备CNT@TiO_2载体,利用电沉积法制备用于直接甲醇燃料电池的PtCo-CNT@TiO_2阳极催化剂。采用透射电子显微镜(TEM)、X射线衍射(XRD)和电化学工作站对其进行表征。结果表明,PtCo-CNT@TiO_2复合纳米材料有明显的结晶,且金属粒子围绕在TiO_2包覆的碳纳米管的周围,用于直接甲醇燃料电池阳极催化剂具有较高的活性与稳定性。该PtCo-CNT@TiO_2催化剂的电化学比表面积为164 m~2/g,65℃时甲醇的氧化峰电流达到45 mA/cm~2,计时电流曲线表明300 s后PtCo-CNT@TiO_2的氧化电流趋于24 mA/cm~2,在碱性条件下甲醇的氧化峰电流为39.7 mA/cm~2。

Highly active PtCo-CNT@TiO2 composite nanoanode catalyst for direct methanol fuel cells

With CNT@TiO₂ prepared by sol-gel method as the support, the PtCo-CNT@TiO₂ composite was prepared by electro-deposition and used as the anode catalyst for direct methanol fuel cells. The PtCo-CNT@TiO₂ composite was characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and electrochemical workstation. The results show that the PtCo-CNT@TiO₂ composite displays significant crystals and the metal particles surround the TiO₂-coated carbon nanotubes; when used as the anode catalyst for direct methanol fuel cells, it exhibits high activity and stability. The PtCo-CNT@TiO₂ catalyst has an electrochemical surface area of 164 m²/g and the oxidation peak current of methanol reaches 45 mA/cm² at 65 ℃; after 300 s, the oxidation current tends to be 24 mA/cm² and the oxidation peak current of methanol under alkaline conditions is 39.7 mA/cm².