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由于不同金属之间氧化还原电势、原子半径和电负性的不同,设计和制备形貌和合金成分可控双金属合金纳米晶仍具挑战.金属欠电位沉积(UPD)诱导Cu还原合成Cu比例可达50%的八面体Pt-Cu合金纳米晶的基础上,引入正丁胺,通过其与金属的配位作用调节了Pt和Cu前驱物的还原速度,进一步将Cu的比例提高到75%.与UPD单原子层沉积类似,在该反应中每个被还原的Pt原子均有能力催化Cu原子的还原并键合最多12个Cu原子(密堆积结构),而铜前驱物不能在Cu原子表面上直接还原,使得纳米晶体中Cu的比例最高达到75%.此外,性能研究表明Pt Cu3纳米晶体表现出最高的电催化活性和稳定性.
Due to the difference of redox potential, atomic radius and electronegativity between different metals, it is still challenging to design and fabricate controlled bimetal alloy nanocrystals with morphology and alloy composition. The Cu-reduction ratio of Cu induced by metal underpotential deposition (UPD) Up to 50% octahedral Pt-Cu alloy nanocrystals based on the introduction of n-butylamine, through the coordination of the metal and the coordination of the Pt and Cu precursor reduction rate, the further increase the proportion of Cu to 75% Similar to UPD single atomic layer deposition, each reduced Pt atom in the reaction is capable of catalyzing the reduction of Cu atoms and bonding up to 12 Cu atoms (close-packed structure), whereas copper precursors can not anneal to Cu atoms The direct reduction on the surface leads to the highest proportion of Cu in the nanocrystals up to 75% .In addition, performance studies show that Pt Cu3 nanocrystals exhibit the highest electrocatalytic activity and stability.