Enhanced electrocatalytic performance of ultrathin PtNi alloy nanowires for oxygen reduction reaction
Enhanced electrocatalytic performance of ultrathin PtNi alloy nanowires for oxygen reduction reaction
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DOI：
10.1007/s11708-017-0499-x
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发表时间：
2017-08
影响因子：
2.9
通讯作者：
Hongjie Zhang;Yachao Zeng;Longsheng Cao;Limeng Yang;Dahui Fang;B. Yi;Z. Shao
中科院分区：
文献类型：
--
作者：
Hongjie Zhang;Yachao Zeng;Longsheng Cao;Limeng Yang;Dahui Fang;B. Yi;Z. Shao
在本文中，合成了碳负载的超薄铂纳米线（Pt NWs）和PtNi合金纳米线（PtNi NWs）作为氧还原反应（ORR）的电催化剂。以CTAB为表面活性剂，采用软模板法制备了由互连纳米粒子组成的Pt和PtNi NWs催化剂。研究了 Pt NWs 和 PtNi NWs ORR 催化剂的物理表征和电催化性能，并将结果与商用 Pt/C 催化剂进行了比较。 PtNi合金中Pt和Ni的原子比约为3:1。结果表明，与Ni合金化后，Pt的结合能移向更高的值，表明其电子结构发生变化，并且与Pt NWs甚至Pt/C催化剂相比，Pt3Ni NWs催化剂具有显着更高的电催化活性和良好的ORR稳定性。 Pt3Ni NWs催化剂电催化活性的增强主要是由于合金中Pt和Ni之间的相互作用导致Pt的能带中心下移，这有利于含氧物质（Oadsor OHads）的解吸和活性位点的释放。
In this paper, ultrathin Pt nanowires (Pt NWs) and PtNi alloy nanowires (PtNi NWs) supported on carbon were synthesized as electrocatalysts for oxygen reduction reaction (ORR). Pt and PtNi NWs catalysts composed of interconnected nanoparticles were prepared by using a soft template method with CTAB as the surface active agent. The physical characterization and electrocatalytic performance of Pt NWs and PtNi NWs catalysts for ORR were investigated and the results were compared with the commercial Pt/C catalyst. The atomic ratio of Pt and Ni in PtNi alloy was approximately 3 to 1. The results show that after alloying with Ni, the binding energy of Pt shifts to higher values, indicating the change of its electronic structure, and that Pt3Ni NWs catalyst has a significantly higher electrocatalytic activity and good stability for ORR as compared to Pt NWs and even Pt/C catalyst. The enhanced electrocatalytic activity of Pt3Ni NWs catalyst is mainly resulted from the downshifted-band center of Pt caused by the interaction between Pt and Ni in the alloy, which facilitates the desorption of oxygen containing species (Oadsor OHads) and the release of active sites.