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首页> 外文期刊>ACS catalysis >PdxCoy Nanoparticle/Carbon Nano?ber Composites with Enhanced Electrocatalytic Properties
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PdxCoy Nanoparticle/Carbon Nano?ber Composites with Enhanced Electrocatalytic Properties

机译：具有增强的电催化性能的PdxCoy纳米颗粒/碳纳米纤维复合材料

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摘要

Novel bimetallic Pd_xCo_y alloy nanoparticle (NP)/carbon nano?ber (CNF) composites with superior electrocatalytic performances were successfully prepared by electrospinning Pd and Co precursors, i.e., Pd(acac)2 and Co(acac)2, in polyacrylonitrile followed by a thermal treat- ment. Uniform dispersion of PdxCoy nanoparticles in carbon nano?bers was achieved. Chemical composition and size of the resulting Pd_xCo_y NPs, which showed a substantial effect on the electrocatalytic properties of Pd_xCo_y/CNF nanocomposites, can be readily controlled by adjusting the feed ratio of metal precursors. In comparison with commercial Pd/C and other state-of-the-art Pd- or Pt-based catalysts, Pd_xCo_y/CNF nano- composites prepared in this study exhibited much higher electrocatalytic activity and stability in formic acid and methanol oxidation reactions. This improved electrocatalytic performance is very attractive for fuel cell applications and can be attributed to the unique bimetallic Pd-Co alloy formation, a modi?ed electronic structure of Pd in Pd_xCo_y, as well as uniform dispersion and ?rm embedment of Pd_xCo_y NPs in CNF.
机译：通过将Pd和Co的前驱体（即Pd（acac）2和Co（acac）2）先在聚丙烯腈中电纺，然后再在聚丙烯腈中进行电纺，成功制备了具有优异电催化性能的新型双金属Pd_xCo_y合金纳米颗粒（NP）/碳纳米纤维（CNF）复合材料。热处理。实现了PdxCoy纳米颗粒在碳纳米纤维中的均匀分散。可以通过调节金属前体的进料比容易地控制对Pd_xCo_y / CNF纳米复合材料的电催化性能产生实质性影响的所得Pd_xCo_y NP的化学组成和尺寸。与商业化的Pd / C和其他最先进的Pd或Pt基催化剂相比，本研究中制备的Pd_xCo_y / CNF纳米复合材料在甲酸和甲醇氧化反应中表现出更高的电催化活性和稳定性。这种改进的电催化性能对燃料电池应用非常有吸引力，并且可以归因于独特的双金属Pd-Co合金形成，Pd_xCo_y中Pd的修饰电子结构以及CNF中Pd_xCo_y NP的均匀分散和牢固嵌入。 。

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