Screw-like PdPt nanowires as highly efficient electrocatalysts for methanol and ethylene glycol oxidation†,Journal of Materials Chemistry A

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Screw-like PdPt nanowires as highly efficient electrocatalysts for methanol and ethylene glycol oxidation†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2018-01-01 00:00:00 , DOI: 10.1039/c7ta09595c
Jing-Xiao Tang _{1,

2,

3,

4,

5} , Qing-Song Chen _{1,

2,

3,

4,

5} , Le-Xing You _{4,

5,

6,

7,

8} , Hong-Gang Liao _{9,

10,

11,

12,

13} , Shi-Gang Sun _{9,

10,

11,

12,

13} , Shun-Gui Zhou _{4,

5,

6,

7,

8} , Zhong-Ning Xu _{1,

2,

3,

4,

5} , Yu-Min Chen _{1,

2,

3,

4,

5} , Guo-Cong Guo _{1,

2,

3,

4,

5}

Affiliation

The performance of Pd and Pt based catalysts for electrocatalysis is closely correlated with their surface structures and compositions. In this paper we developed an electrochemical route to synthesize novel bimetallic screw-like PdPt nanowires (PdPt NWs) with tunable composition. The surface of the as-synthesized screw-like nanowires is extremely rough, bounded with high-index facets and thus exhibits a high density of active sites. The particular surface structure together with the synergetic effect and electronic effect accounts for the enhanced catalytic activity and durability towards methanol and ethylene glycol electrooxidation (MOR and EGOR). The activity of PdPt NWs is highly dependent on their composition; Pd₁Pt₁ NWs exhibit the highest catalytic activity for MOR that is 2.4-fold and 5.4-fold higher than that of the typical pure high-index Pt tetrahexahedrons (Pt THHs) and commercial Pt/C, respectively. It should be stressed that the initial activity of Pd₁Pt₁ NWs towards EGOR is close to that of Pt THHs but the stability of the Pd₁Pt₁ NWs can be significantly enhanced. In situ FTIR spectroscopic studies of the Pd₁Pt₁ NWs have revealed that their ability towards CO-tolerance is highly improved, and their capability of cleaving the C–C bond of EG is greatly promoted. This study has shed new light on the structure and composition tuning of PdPt nanocatalysts with high performance, which is of great significance for direct alcohol fuel cells.

中文翻译：

螺旋状PdPt纳米线是甲醇和乙二醇氧化的高效电催化剂†

Pd和Pt基催化剂的电催化性能与其表面结构和组成密切相关。在本文中，我们开发了一种电化学途径来合成具有可调组成的新型双金属螺旋状PdPt纳米线（PdPt NWs）。合成后的螺旋状纳米线的表面非常粗糙，以高折射率小面为界，因此显示出高密度的活性位点。特殊的表面结构以及协同效应和电子效应有助于提高催化活性和对甲醇和乙二醇电氧化（MOR和EGOR）的耐久性。PdPt NWs的活性高度依赖于它们的组成。钯₁铂₁NWs对MOR的催化活性最高，分别比典型的纯高指数Pt四面体（Pt THHs）和市售Pt / C高2.4倍和5.4倍。应该强调的是，Pd ₁ Pt ₁ NW的初始活性与EGOR接近，但是Pd ₁ Pt ₁ NW的稳定性可以显着提高。Pd ₁ Pt _1的原位FTIR光谱研究西北地区已经表明，它们对CO耐受的能力得到了极大提高，并且它们裂解EG的C–C键的能力得到了大大提高。这项研究为高性能的PdPt纳米催化剂的结构和组成调节提供了新的思路，这对直接醇类燃料电池具有重要意义。

更新日期：2018-01-01

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