LAUSR

Less-expensive but efficient electrocatalysts are essential to accelerate the commercialization of fuel cells. Herein, ultrathin PdPb nanowires (PdPb NWs) with a diameter of around 3.5 nm were prepared by using a one-step hydrothermal method. The introduction of Pb in Pd-based bimetallic nanostructures produced high differences in the morphology from Pd nanoparticles (NPs) to various PdPb NWs. All the as-prepared PdPb NWs exhibited better electrocatalytic activity and durability than Pd NPs due to the synergistic effect. Especially, Pd 65 Pb 35 possessed the highest current density of about 3460 mA mg Pd −1 for the ethanol electrooxidation which was around 6.3 times higher than commercial Pd/C. The high-performance of Pd 65 Pb 35 is attributed to the defect-rich and stable nanowire structure with optimized surface atomic arrangement, as evidenced by high resolution transmission electron microscopy measurements and long-time treatment in an acidic media. The differences in the morphologies and electrocatalytic activities of PdPb NWs with varied Pb contents have also been discussed and analyzed. 价格低廉且高效的电催化剂是加速燃料电池商业化的关键. 本文采用一步水热法制备出直径约3.5 nm的超细PdPb纳米线. 在 钯基双金属纳米结构中引入铅后, 不同组成的PdPb纳米线与钯纳 米颗粒的形貌差异较大. XRD、TEM、XPS和电化学表征结果证 实, 由于双金属间的协同效应, PdPb纳米线的电催化活性和耐久性 均优于钯纳米颗粒. 其中, Pd 65 Pb 35 的乙醇电氧化电流密度最高, 可 达3460 mA mg Pd −1 , 约为商业Pd/C的6.3倍. HRTEM测试和经酸性 介质长期处理后的表征结果显示, Pd 65 Pb 35 表面原子的优化排列和 丰富的缺陷使其表现出高性能. 此外, 本文讨论和分析了不同铅含 量的PdPb纳米线之间形貌和电催化活性的差异.