Underpotential Deposition-Induced Synthesis of Composition-Tunable PtCu Nanocrystals and Their Catalytic Properties
Underpotential Deposition-Induced Synthesis of Composition-Tunable PtCu Nanocrystals and Their Catalytic Properties
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成分可调 PtCu 纳米晶的欠电位沉积诱导合成及其催化性能
DOI：
10.1002/chem.201203729
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发表时间：
2013-02-01
影响因子：
4.3
通讯作者：
Zheng, Lansun
中科院分区：
文献类型：
--
作者：
Jiang, Yaqi;Jia, Yanyan;Zheng, Lansun
以N，N-二甲基甲酰胺为溶剂，十六烷基三甲基氯化铵为还原剂，成功地合成了PtCu合金八面体纳米晶。Cu欠电位沉积（UPD）被发现在PtCu合金纳米碳的形成中起着关键作用。PtCu合金中的组成可以通过调节溶液中金属前体的比例来调节。然而，PtCu合金NC中的Cu含量不能超过50%。由于Cu前体不能被还原成金属铜并且Cu含量不能超过50%的事实，我们通过在Pt表面上使用Cu UPD来实现PtCu合金的形成。此外，还研究了不同组成的PtCu合金纳米粒子对甲酸的电催化氧化性能。结果表明，PtCu合金的组成对催化性能有很大的影响. Pt_（50）Cu_（50）样品对甲酸的电催化氧化具有良好的催化活性。
PtCu alloy octahedral nanocrystals (NCs) have been synthesized successfully by using N,N-dimethylformamide as both the solvent and the reducing agent in the presence of cetyltrimethylammonium chloride. Cu underpotential deposition (UPD) is found to play a key role in the formation of the PtCu alloy NCs. The composition in the PtCu alloy can be tuned by adjusting the ratio of metal precursors in solution. However, the Cu content in the PtCu alloy NCs cannot exceed 50%. Due to the fact that Cu precursor cannot be reduced to metallic copper and the Cu content cannot exceed 50%, we achieved the formation of the PtCu alloy by using Cu UPD on the Pt surface. In addition, the catalytic activities of PtCu alloy NCs with different composition were investigated in electrocatalytic oxidation of formic acid. The results reveal that the catalytic performance is strongly dependent on PtCu alloy composition. The sample of Pt50Cu50 exhibits excellent activity in electrocatalytic oxidation of formic acid.