Ternary PtNi/PtxPb/Pt core/multishell nanowires as efficient and stable electrocatalysts for fuel cell reactions,Journal of Materials Chemistry A

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Ternary PtNi/PtxPb/Pt core/multishell nanowires as efficient and stable electrocatalysts for fuel cell reactions
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2017-08-25 00:00:00 , DOI: 10.1039/c7ta05130a
Nan Zhang _{1,

2,

3,

4} , Yiming Zhu _{1,

2,

3,

4} , Qi Shao _{1,

2,

3,

4} , Xing Zhu _{3,

4,

5} , Xiaoqing Huang _{1,

2,

3,

4}

Affiliation

Platinum (Pt) is the best catalyst component towards fuel cell reactions, while its scarcity and high cost largely restrict its practical applications. To overcome these limitations, precisely designing functional Pt-based electrocatalysts is highly desirable. Herein, for the first time we report a facile strategy for the construction of ternary PtNi/Pt_xPb/Pt core/multishell nanowires (NWs), which combine the features of a core–multishell structure, an alloy effect, and a one dimensional structure. The use of preformed ultrathin PtNi NWs as substrates, sequential reduction/diffusion of Pb onto the ultrathin PtNi NWs, and the further reduction of Pt play important roles in the formation of ternary PtNi/Pt_xPb/Pt NWs. The combined features enable them to be more active and stable for anodic alcohol oxidations including the methanol oxidation reaction, ethanol oxidation reaction, ethylene glycol oxidation reaction, and glycerol oxidation reaction, as well as the cathodic oxygen reduction reaction than commercial Pt/C. Among various electrocatalysts investigated, the optimized PtNi_0.67Pb_0.26 NWs show the best activity and durability for all the fuel cell reactions tested. This work highlights the importance of precise composition and structure tunings of Pt-based electrocatalysts for fuel cell reactions.

中文翻译：

三元PtNi / Pt _x Pb / Pt核/多壳纳米线作为燃料电池反应的有效和稳定的电催化剂

铂（Pt）是燃料电池反应的最佳催化剂成分，而其稀缺性和高成本在很大程度上限制了其实际应用。为了克服这些限制，非常需要精确设计功能性的基于Pt的电催化剂。在此，我们首次报道了一种简便的策略来构造三元PtNi / Pt _x Pb / Pt核/多壳纳米线（NWs），该策略结合了核-多壳结构，合金效应和一维特征结构体。使用预制的超薄PtNi NW作为基质，将Pb依次还原/扩散到超薄PtNi NWs上，以及Pt的进一步还原在三元PtNi / Pt _x的形成中起重要作用Pb / Pt NWs。结合的特征使它们对于阳极醇氧化（包括甲醇氧化反应，乙醇氧化反应，乙二醇氧化反应和甘油氧化反应以及阴极氧还原反应）比市售Pt / C更具活性和稳定性。在研究的各种电催化剂中，经过优化的PtNi _0.67 Pb _0.26 NWs对于所有测试的燃料电池反应均显示出最佳的活性和耐久性。这项工作强调了Pt基电催化剂的精确组成和结构调整对燃料电池反应的重要性。

更新日期：2017-09-19

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