Ultrafine Pt-based high-entropy alloy nanooctahedra deliver enhanced methanol oxidation reaction activity and durability

IF 17.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Matter Pub Date : 2025-05-07 DOI:10.1016/j.matt.2025.102096

Chengyu Li , Peng Qin , Gongao Peng , Geoffrey I.N. Waterhouse , Lu Shang , Tierui Zhang

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Abstract

Pt-based nanooctahedra exposing highly active (111) facets demonstrate outstanding electrochemical activity in various types of fuel cells. However, simultaneously controlling the morphology, size, and electronic structure of such nanooctahedra is challenging. Herein, a high-entropy alloy (HEA) approach was adopted to reduce the size of the Pt-based nanooctahedra while also tuning the electronic structure. As a result, carbon-supported HEA PtNiCuMoCoIr nanooctahedra (PtNiCuMoCoIr/C, with an edge length of only 2.8 nm) exhibited a remarkable mass activity of 3.34 A mg_PGM⁻¹ for the methanol oxidation reaction (MOR) in acidic conditions, which was 2.2 and 7.3 times higher than ternary PtNiCu/C nanooctahedra and commercial Pt/C, respectively. Furthermore, PtNiCuMoCoIr/C exhibited excellent CO poisoning resistance with a mass activity loss of only 6.6% after a chronoamperometric test. The combination of ultrafine nanooctahedra and the selected HEA elements generated lattice strain and favorably tuned the electronic structure, which improved the MOR performance by enhancing the adsorption of ∗OH.

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超细pt基高熵合金纳米八面体具有增强的甲醇氧化反应活性和耐久性

基于pt的纳米八面体暴露出高活性（111）面，在各种类型的燃料电池中表现出出色的电化学活性。然而，同时控制这种纳米八面体的形态、尺寸和电子结构是具有挑战性的。本文采用高熵合金（high-entropy alloy， HEA）方法减小了pt基纳米面体的尺寸，同时调整了电子结构。结果表明，碳负载的HEA PtNiCuMoCoIr纳米面体（PtNiCuMoCoIr/C，边长仅为2.8 nm）在酸性条件下甲醇氧化反应（MOR）的质量活性为3.34 a mgPGM−1，分别是三元PtNiCu/C纳米面体和商用Pt/C纳米面体的2.2和7.3倍。此外，PtNiCuMoCoIr/C表现出优异的CO中毒抗性，经过计时电流测试，质量活性损失仅为6.6%。超细纳米八面体与选定的HEA元素结合产生晶格应变，有利于调整电子结构，通过增强对* OH的吸附提高了MOR性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Matter MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

26.30

自引率

2.60%

发文量

367

期刊介绍： Matter, a monthly journal affiliated with Cell, spans the broad field of materials science from nano to macro levels,covering fundamentals to applications. Embracing groundbreaking technologies,it includes full-length research articles,reviews, perspectives,previews, opinions, personnel stories, and general editorial content. Matter aims to be the primary resource for researchers in academia and industry, inspiring the next generation of materials scientists.