Preparation and electrocatalytic performance of PtPb anode catalyst supported on carbon fiber
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摘要: 以静电纺丝技术与烧结工艺相结合的方式制备了碳纤维基PtPb纳米催化剂,并采用X射线衍射(XRD)、红外光谱(FT-IR)、扫描电镜(SEM)等分析测试手段对其进行了表征。结果表明,在预氧化温度为300 ℃、碳化温度为800 ℃的条件下,所制备的PtPb阳极纳米催化剂结晶程度好、比表面积大,粒径约为3.05 nm,催化活性颗粒均匀分散在多孔碳纤维骨架上。采用循环伏安法(CV)及交流阻抗(EIS)评价了该催化剂对乙醇氧化反应的电催化性能。结果表明,最大峰电流密度达到125 mA/cm2,电荷转移电阻相较于700 ℃下降了近60%。
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关键词:
- 直接乙醇燃料电池(DEFC) /
- 阳极催化剂 /
- 静电纺丝 /
- 乙醇电氧化
Abstract: Nano PtPb anode catalyst supported on carbon fiber was prepared by the technology of electro-spinning combined with sintering; the catalyst was characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) and scanning electron microscopy (SEM). The results showed that the nano catalyst is well dispersed on the skeleton of vesicular carbon fiber with a particle size of 3.05 nm; the catalytic efficiency is significantly improved by pre-oxidation at 300 ℃and carbonization at 800 ℃. The catalyst activity in ethanol oxidation was evaluated through cyclic voltammogram (CV) and electrochemical impedance spectroscopy (EIS). The results indicated that the catalyst has better resistance against poisoning; over it, the maximum current density is 125 mA/cm2 and the charge transfer resistance is reduced by 60% in comparison with that over the catalyst carbonized at 700 ℃. -
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