Structure-intensified PtCoRh spiral nanowires as highly active and durable electrocatalysts for methanol oxidation,Nanoscale

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Structure-intensified PtCoRh spiral nanowires as highly active and durable electrocatalysts for methanol oxidation
Nanoscale ( IF 5.8 ) Pub Date : 2021-1-6 , DOI: 10.1039/d0nr08497b
Xiaowei Chen _{1,

2,

3,

4} , Wei Wang _{1,

2,

3,

4} , Xuejiao Chen _{1,

2,

3,

4} , Xinyan Liao _{1,

2,

3,

4} , Zixi Lyu _{1,

2,

3,

4} , Kai Liu _{1,

2,

3,

4} , Shuifen Xie _{1,

2,

3,

4}

Affiliation

Platinum (Pt)-based nanocatalysts with a high density of surface atomic steps hold great prospects in electrocatalysis. However, the structural instability under harsh redox conditions is still a rigorous challenge. Here, we demonstrate that ternary PtCoRh alloyed spiral nanowires (SNWs), which have the advantages of one-dimensional nanowires, alloy synergy, surface atomic steps, and anti-corrosive Rh incorporation, can serve as active and robust MOR electrocatalysts in acidic media. The results showed that the Pt₇₇Co₁₁Rh₁₂ SNWs delivered the highest mass activity (1.48 A mg⁻¹) and specific activity (4.76 mA cm⁻²), as well as the best durability in the long-term MOR test, compared with the Pt₈₅Co₁₀Rh₅ and Pt₈₅Co₁₅ SNWs and Pt black. Further inspections of the morphology, composition, and electronic structure revealed that the incorporated Rh atoms not only stabilized the highly rugged SNWs and the easily leaching Co atoms but also delicately tuned the electron transfer among the three metallic elements, leading to the enhancement of MOR activity, structural stability and anti-CO-poisoning ability. Our work provides a rational strategy for the development of highly efficient and durable alcohol oxidation electrocatalysts.

中文翻译：

结构增强的PtCoRh螺旋纳米线是甲醇氧化的高活性和持久性电催化剂

具有高表面原子步长密度的铂（Pt）基纳米催化剂在电催化方面具有广阔的前景。然而，在苛刻的氧化还原条件下的结构不稳定性仍然是严峻的挑战。在这里，我们证明三元PtCoRh合金螺旋纳米线（SNWs）具有一维纳米线，合金协同作用，表面原子台阶和抗腐蚀Rh掺入的优点，可以在酸性介质中用作活性和稳健的MOR电催化剂。结果表明，与长期MOR测试相比，Pt ₇₇ Co ₁₁ Rh ₁₂ SNW具有最高的质量活性（1.48 A mg ^-1）和比活性（4.76 mA cm ^-2），以及最佳的耐久性。 Pt ₈₅Co ₁₀ Rh ₅和Pt ₈₅ Co ₁₅ SNW和Pt黑色。进一步检查形态，组成和电子结构后发现，掺入的Rh原子不仅稳定了高度坚固的SNW和容易浸出的Co原子，而且还精细地调节了三种金属元素之间的电子转移，从而提高了MOR活性。，结构稳定性和抗CO中毒能力。我们的工作为开发高效，耐用的醇氧化电催化剂提供了合理的策略。

更新日期：2021-01-26

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