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连接高的核心与Rh外,以获得高效的pH-通用进化

Min Wei¹, Yuyan Sun¹, Junyu Zhang¹

¹The Institute for Advanced Studies, Wuhan University, Wuhan, 430072, P. R. China.

Small (Weinheim an der Bergstrasse, Germany)

|August 24, 2024

概括

研究人员开发了新的核心外 (CS) 高合金 (HEA) 纳米粒子,用于在所有pH水平上有效的演变反应 (HER) 催化. 与传统材料相比,这些先进的催化剂显示出明显增强的活性.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
纳米技术纳米技术

背景情况:

高合金 (HEAs) 为催化提供了独特的特性.
核心 (CS) 纳米结构可以提高催化性能.
将CS结构与HEA整合在一起,带来了重大挑战.

研究的目的:

为了合成和描述新的PtCoNiMoRh@Rh CS纳米粒子.
为了评估这些纳米粒子的pH-通用演化反应 (HER) 活性.
了解结构-活性关系,以改进HEA催化剂设计.

主要方法:

合成PtCoNiMoRh@Rh核心外纳米颗粒 (∼5.7 nm).
在酸性,中性和性电解质中进行演变反应 (HER) 的电化学测试.
为了研究电子结构和轨道移位,进行理论计算.

主要成果:

PtCoNiMoRh@Rh CS纳米粒子表现出异常的HER活性,需要低超电位 (9.1 mV在酸性中,24.9 mV在中性中,17.1 mV在性中) 达到-10 mA cm−2.2.
质量活性明显高于Rh/C (5.8x在酸中,2.79x在中性中,91.8x在中).
理论计算显示,Rh4d空置状态减少,HEA核心和Rh外之间的协同效应有助于增强活动.

结论:

开发的PtCoNiMoRh@Rh CS纳米颗粒对pH-通用HER非常有效.
核心外架构和HEA组成对于卓越的催化性能至关重要.
这项研究为设计用于能源应用的具有CS结构的先进HEA催化剂提供了一条途径.

关键词:

在PtCoNiMoRh@Rh核心外.高性催化剂的高性催化有多个活跃站点.pH-通用的演化

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