Pt-surface stabilization by high-entropy alloys for enhancing oxygen reduction reaction property: Single-crystal model catalyst study

IF 4.7 3区工程技术 Q2 ELECTROCHEMISTRY Electrochemistry Communications Pub Date : 2023-12-26 DOI:10.1016/j.elecom.2023.107657

Yoshihiro Chida , Takeru Tomimori , Naoto Todoroki , Toshimasa Wadayama

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Abstract

In this work, we study the oxygen reduction reaction (ORR) properties of Pt-containing 3d transition-metal high-entropy alloy (Pt-HEA) surfaces, focusing on the constituent alloying elements. The surface Pt and underlying Cr-Mn-Co-Ni(1 1 1) (Pt/Cr-Mn-Co-Ni(1 1 1)) stacked lattice layers, which are synthesized through the vacuum deposition of the underlying alloy and surface Pt stacking layers on Pt(1 1 1) substrate, exhibit high pristine ORR activity and structural stability under potential-cycle loading, compared to Pt/Cr-Co-Ni, Pt/Mn-Co-Ni, and Pt/Co-Ni(1 1 1) surfaces. The outperformed ORR properties are attributed to the effective suppression of the surface segregation of Cr. This study demonstrates that not only the “high-entropy” effect induced by increasing the numbers of constituent elements but also the “chemical affinity” of Pt and the individual HEA constituent elements determine the ORR performances of Pt-HEA.

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利用高熵合金稳定铂表面以提高氧还原反应性能：单晶模型催化剂研究

在这项工作中，我们研究了含铂三维过渡金属高熵合金（Pt-HEA）表面的氧还原反应（ORR）特性，重点是合金的组成元素。与 Pt/Cr-Co-Ni、Pt/Mn-Co-Ni 和 Pt/Co-Ni(111)表面相比，通过在 Pt(111) 基底上真空沉积底层合金和表面铂堆积层而合成的表面铂和底层 Cr-Mn-Co-Ni(111) （Pt/Cr-Mn-Co-Ni(111)）堆积晶格层在电位循环负载下表现出较高的原始 ORR 活性和结构稳定性。其出色的 ORR 性能归因于有效抑制了铬的表面偏析。这项研究表明，Pt-HEA 的 ORR 性能不仅取决于增加组成元素数量所引起的 "高熵 "效应，还取决于铂和单个 HEA 组成元素的 "化学亲和性"。

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来源期刊

Electrochemistry Communications 工程技术-电化学

CiteScore

8.50

自引率

3.70%

发文量

160

审稿时长

1.2 months

期刊介绍： Electrochemistry Communications is an open access journal providing fast dissemination of short communications, full communications and mini reviews covering the whole field of electrochemistry which merit urgent publication. Short communications are limited to a maximum of 20,000 characters (including spaces) while full communications and mini reviews are limited to 25,000 characters (including spaces). Supplementary information is permitted for full communications and mini reviews but not for short communications. We aim to be the fastest journal in electrochemistry for these types of papers.