Preserving the Exposed Facets of Pt3Sn Intermetallic Nanocubes During an Order to Disorder Transition Allows the Elucidation of the Effect of the Degree of Alloy Ordering on Electrocatalysis,Journal of the American Chemical Society

当前位置： X-MOL 学术 › J. Am. Chem. Soc. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Preserving the Exposed Facets of Pt3Sn Intermetallic Nanocubes During an Order to Disorder Transition Allows the Elucidation of the Effect of the Degree of Alloy Ordering on Electrocatalysis
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2020-01-28 , DOI: 10.1021/jacs.9b13313
Hsiang-Sheng Chen , Tania M Benedetti , Vinicius R Gonçales , Nicholas M Bedford , Robert W J Scott ₁ , Richard F Webster , Soshan Cheong , J Justin Gooding , Richard D Tilley

Affiliation

Controlling which facets are exposed in nanocrystals is crucial to understanding different activity between ordered and disordered alloy electrocatalysts. We modify the degree of ordering of Pt3Sn nanocubes, while maintaining the shape and size, to enable a direct evaluation of the effect of the order on ORR catalytic activity. We demonstrate a 2.3-fold enhancement in specific activity by 60- and 30%-ordered Pt3Sn nanocubes compared to 95%-ordered. This was shown to be likely due to surface vacancies in the less-ordered particles. The greater order, however, results in higher stability of the electrocatalyst, with the more disordered nanoparticles showing the dissolution of tin and platinum species during electrocatalysis.

中文翻译：

在有序到无序转变过程中保留 Pt3Sn 金属间纳米立方体的暴露面可以阐明合金有序度对电催化的影响

控制纳米晶体中暴露的面对于理解有序和无序合金电催化剂之间的不同活性至关重要。我们修改了 Pt3Sn 纳米立方体的有序度，同时保持形状和尺寸，从而能够直接评估有序度对 ORR 催化活性的影响。我们证明，与 95% 的有序 Pt3Sn 纳米立方体相比，60% 和 30% 有序的 Pt3Sn 纳米立方体的比活性提高了 2.3 倍。这被证明可能是由于低序粒子中的表面空位。然而，更大的有序性导致电催化剂的稳定性更高，更无序的纳米粒子显示出在电催化过程中锡和铂物质的溶解。

更新日期：2020-01-28

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南