Ordered PtPb/Pt Core/Shell Nanodisks as Highly Active, Selective, and Stable Catalysts for Methanol Reformation to H2,Advanced Energy Materials

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Ordered PtPb/Pt Core/Shell Nanodisks as Highly Active, Selective, and Stable Catalysts for Methanol Reformation to H2
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2018-02-19 , DOI: 10.1002/aenm.201703430
Bin E _{1,

2} , Qi Shao ₁ , Lingzheng Bu ₁ , Shuxing Bai ₁ , Yujing Li _{2,

3} , Xiaoqing Huang ₁

Affiliation

Herein, we report on unique bimetallic PtPb/Pt core/shell nanodisks consisting of structurally ordered PtPb hexagonal nanoplates as the core and the well‐organized Pt as the shell, as extremely active and selective catalysts towards CH₃OH reformation. We found that the created Pt‐Pb nanodisks/C show the composition‐dependent activity with the optimized PtPb_0.56 nanodisks/C being the most active for the CH₃OH reformation to H₂, 5.1 times higher than those of the commercial Pt/C. Significantly, only very limited carbon monoxide (CO) is produced during the CH₃OH reformation, which is crucial for the practical application in fuel cells. The PtPb_0.56 nanodisks/C is also more active for CH₃OH reformation than PtPb hexagonal nanoplates/C and PtPb_0.58 nanoparticles/C. X‐ray photoelectron spectroscopy (XPS) results reveal that the high ratio of Pt (0) to Pt (II) in Pt‐Pb nanodisks/C enhances the CH₃OH reformation to H₂, while the high content of Pb (0) is beneficial for decrease the CO production. Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) of CO adsorption shows that Pt‐Pb nanodisks can promote the activation of CO molecules by forming the carboxylate (CO₂^δ⁻) intermediates, leading to the low CO production.

中文翻译：

订购的PtPb / Pt核/壳纳米盘是用于甲醇重整为H2的高活性，选择性和稳定催化剂

在本文中，我们报道了独特的双金属PtPb / Pt核/壳纳米盘，它是结构有序的PtPb六角形纳米板作为核，而组织良好的Pt作为壳，是对CH ₃ OH重整的极活泼和选择性的催化剂。我们发现，创建的Pt-Pb纳米磁盘/ C显示出与成分有关的活性，优化的PtPb _0.56纳米磁盘/ C对于CH ₃ OH重整为H ₂最为活跃，比市售Pt / C高5.1倍。值得注意的是，在CH ₃ OH重整过程中仅产生非常有限的一氧化碳（CO），这对于燃料电池的实际应用至关重要。铂_0.56与PtPb六角形纳米板/ C和PtPb _0.58纳米颗粒/ C相比，nanodisks / C对CH ₃ OH的重整也更具活性。X射线光电子能谱（XPS）结果表明，Pt-Pb纳米盘/ C中Pt（0）与Pt（II）的高比例增强了CH ₃ OH重整为H _2的能力，而Pb（0）的含量高有利于减少CO的产生。漫反射红外傅里叶变换的CO吸附表明，铂-铅纳米盘可以通过形成羧酸促进CO分子的活化光谱（DRIFTS）（CO ₂^δ^-）的中间体，导致低的CO的生产。

更新日期：2018-02-19

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