Nanostructured Polyaniline-Decorated Pt/C@PANI Core-Shell Catalyst with Enhanced Durability and Activity
Nanostructured Polyaniline-Decorated Pt/C@PANI Core-Shell Catalyst with Enhanced Durability and Activity
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具有增强耐久性和活性的纳米结构聚苯胺修饰的 Pt/C@PANI 核壳催化剂
DOI：
10.1021/ja306501x
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发表时间：
2012-08-15
影响因子：
15
通讯作者：
Li, Li
中科院分区：
文献类型：
--
作者：
Chen, Siguo;Wei, Zidong;Li, Li
我们设计并合成了聚苯胺（PANI）修饰的 Pt/C@PANI 核壳催化剂，与未修饰的 Pt/C 相比，该催化剂表现出更高的催化剂活性和耐久性。实验结果表明，氧还原反应的活性很大程度上取决于PANI壳的厚度，催化性能的最大增强发生在厚度为5 nm时，其次是2.5、0和14 nm。与未改性的 Pt/C 催化剂相比，Pt/C@PANI 还表现出显着改善的稳定性。 Pt/C@PANI催化剂的高活性和稳定性归因于其新颖的PANI修饰的核壳结构，该结构诱导Pt d轨道和PANI π共轭配体之间的电子离域以及从Pt到PANI的电子转移。稳定的 PANT 外壳还可以保护碳支架免于直接暴露于腐蚀环境。
We have designed and synthesized a polyaniline (PANI)-decorated Pt/C@PANI core-shell catalyst that shows enhanced catalyst activity and durability compared with nondecorated Pt/C. The experimental results demonstrate that the activity for the oxygen reduction reaction strongly depends on the thickness of the PANI shell and that the greatest enhancement in catalytic properties occurs at a thickness of 5 nm, followed by 2.5, 0, and 14 nm. Pt/C@PANI also demonstrates significantly improved stability compared with that of the unmodified Pt/C catalyst. The high activity and stability of the Pt/C@PANI catalyst is ascribed to its novel PANI-decorated core shell structure, which induces both electron delocalization between the Pt d orbitals and the PANI pi-conjugated ligand and electron transfer from Pt to PANI. The stable PANT shell also protects the carbon support from direct exposure to the corrosive environment.