一种无膜的自呼吸式直接醇燃料电池

采用液相化学还原法制备出多壁碳纳米管（MWCNT）负载的双金属PdNi纳米颗粒（PdNi／MWCNT）；采用水热法，在乙醇为溶剂和还原剂的体系中，制备出MWCNT负载的双金属AgCo纳米颗粒（AgCo／MWCNT）．碱性溶液中，PdNi／MWCNT对甲醇、乙醇、丙醇和丁醇的氧化具有稳定而强的电催化活性；AgCo／MWCNT对氧还原反应也表现出强的电活性，且对上述高浓度的醇具有较强的耐受力．以PdNi／MWCNT催化剂为阳极，同时将AgCo／MWCNT催化剂制备成气体扩散电极，组装成无离子交换膜的自呼吸式直接醇燃料电池．分别以甲醇、乙醇、丙醇和丁醇为燃料时，这种无膜的燃料电池均能稳定放电，且具有较高的功率密度及较大的输出电压．

A membraneless self-breathing direct alcohol fuel cell

MWCNT loaded bimetallic PdNi nanoparticles （PdNi/MWCNT） have been prepared by using the chemical reduction method. And MWCNT loaded bimetallic AgCo nanoparticles （AgCo/MWCNT） have also been prepared by the hydrothermal method using ethanol as both the solvent and reduction agent. Cyclic voltammetric and chronoamperometric data show that the prepared PdNi/MWCNT presents stable and high electrocatalytic activity for the oxidation of methanol, ethanol, n-propanol and n-butanol in alkaline media. The AgCo/MWCNT exhibits significant electroactivity for oxygen reduction reaction in alkaline media and high tolerance towards the alcohols with high concentrations. A novel membraneless self-breathing direct alcohol fuel cell has been designed by using the anode which is produced from the PdNi/MWCNT nanoparticles and the gas diffusion electrode which is produced from the AgCo/MWCNT nanoparticles. The membraneless fuel cell can be stably discharged and presents higher power densities and output voltages when methanol, ethanol, n-propanol and n-butanol are used as the fuels respectively.