Strained lattice platinum–palladium alloy nanowires for efficient electrocatalysis,Inorganic Chemistry Frontiers

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Strained lattice platinum–palladium alloy nanowires for efficient electrocatalysis
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2020-03-06 , DOI: 10.1039/d0qi00094a
Mengyun Ren _{1,

2,

3,

4,

5} , Fangfang Chang _{1,

2,

3,

4,

5} , Ruifang Miao _{1,

2,

3,

4,

5} , Xianhong He _{1,

2,

3,

4,

5} , Lin Yang _{1,

2,

3,

4,

5} , Xiaolei Wang _{6,

7,

8,

9} , Zhengyu Bai _{1,

2,

3,

4,

5}

Affiliation

The ability to manipulate Pt-based alloy catalysts with controllable compositions and the type of surface facet is important for advancing direct alcohol fuel cells (DAFEs). Pt_xPd_100−x alloy nanowires (NWs) with tunable compositions and (111) facets show a Boerdijk–Coxeter helix type morphology and a slightly strained lattice, and were synthesized by a single-phase and surfactant-free method. X-ray diffraction results show that the alloy compositions can be used to tune the shrinking or expanding lattice parameter of Pt_xPd_100−x NWs. XPS analysis reveals that the alloy effect induced by d-band electron modulation changes the electronic structure and weakens the chemisorption strength of Pt by poisoning species and originally enhances the catalytic activity. The result that the electrocatalytic performance of Pt_xPd_100−x NWs for methanol and ethanol oxidation reactions reveals the high catalytic activity correlated with the exposed facet, strained lattice and alloy compositions. The dominant (111) facets of Pt₆₂Pd₃₈ NWs show the maximum catalytic activity, which is consistent with the XPS result. This finding will open a new way to design highly active and stable alloy nanocatalysts with controllable compositions for enhancing direct alcohol fuel cells.

中文翻译：

应变晶格铂钯合金纳米线，用于高效电催化

以可控的成分和表面刻面类型操作Pt基合金催化剂的能力对于推进直接酒精燃料电池（DAFE）至关重要。具有可调组成和（111）面的Pt _x Pd _{100- x}合金纳米线（NWs）显示出Boerdijk-Coxeter螺旋类型的形态和略微应变的晶格，并且是通过单相和不含表面活性剂的方法合成的。X射线衍射结果表明，该合金成分可用于调节Pt _x Pd _100-_x的收缩或扩展晶格参数西北。XPS分析表明，由d带电子调制引起的合金效应改变了电子结构并削弱了中毒物质对Pt的化学吸附强度，并最初增强了催化活性。Pt _x Pd _{100- x} NWs对甲醇和乙醇的氧化反应的电催化性能表明与暴露的晶面，应变晶格和合金成分相关的高催化活性。Pt ₆₂ Pd ₃₈的主要（111）面NW显示出最大的催化活性，这与XPS结果一致。这一发现将为设计具有可控成分的高活性和稳定的合金纳米催化剂开辟一条新途径，以增强直接酒精燃料电池的性能。

更新日期：2020-04-24

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