La/Ni-Co3O4核壳IrPt纳米合金用于超低贵金属负载的高性能双功能PEM电解。

IF 36.3 1区材料科学 Q1 Engineering

Nano-Micro Letters Pub Date : 2025-07-14 DOI:10.1007/s40820-025-01845-7

Yifei Liu, Xinmeng Er, Xinyao Wang, Hangxing Ren, Wenchao Wang, Feng Cao, Taiyan Zhang, Pan Liu, Yakun Yuan, Fangbo Yu, Yang Ren, Fuqiang Huang, Wenjiang Ding, Lina Chong

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引用次数: 0

摘要

开发高效、耐用、贵金属用量少的双功能催化剂是推进质子交换膜水电解（PEMWE）的关键。我们提出了一种由镧和镍共掺杂钴氧化物支撑的铱铂纳米合金（IrPt），具有核壳结构，具有非晶IrPtOx壳和IrPt核。该催化剂在酸性介质中表现出优异的析氧和析氢双功能活性，在阳极和阴极分别为0.075 mgIr cm-2和0.075 mgPt cm-2的超低负载的PEMWE器件中，在1.72 V下分别达到2 A cm-2。它表现出优异的耐久性，持续水分解超过646 h，降解率仅为5 μV h-1，优于最先进的ir基催化剂。原位x射线吸收光谱和密度泛函理论模拟表明，优化的Ir和Pt之间的电荷再分配以及IrPt核- irptox壳结构提高了性能。Ir-O-Pt活性位点实现了析氧反应的双核机制和析氢反应的Volmer-Tafel机制，降低了动力学障碍。分层孔隙、丰富的氧空位和高电化学表面积进一步改善了电子和质量传递。这项工作为绿色制氢提供了一种经济有效的解决方案，并推动了PEMWE高性能双功能催化剂的设计。

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Core–Shell IrPt Nanoalloy on La/Ni–Co3O4 for High-Performance Bifunctional PEM Electrolysis with Ultralow Noble Metal Loading

Highlights

Core–shell IrPt nanoalloy on La/Ni–Co₃O₄ achieves unprecedented bifunctional activity (2 A cm⁻² at 1.72 V) in proton exchange membrane water electrolysis (PEMWE) with ultralow loadings (0.075 mg cm⁻² Ir/Pt at both electrodes).
646-h durability in PEMWE cell (5 μV h⁻¹ decay) via IrPt-core@IrPtO_x-shell synergy, hierarchical pores, and oxygen vacancies for robust electron/mass transfer and active-site stability.
In situ X-ray absorption spectroscopy combined with density functional theory unveils Ir–O–Pt sites enabling bi-nuclear oxygen evolution reaction and Volmer–Tafel hydrogen evolution reaction mechanisms through optimized Ir/Pt charge redistribution, breaking kinetic limitations.

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来源期刊

Nano-Micro Letters NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

32.60

自引率

4.90%

发文量

981

审稿时长

1.1 months

期刊介绍： Nano-Micro Letters is a peer-reviewed, international, interdisciplinary, and open-access journal published under the SpringerOpen brand. Nano-Micro Letters focuses on the science, experiments, engineering, technologies, and applications of nano- or microscale structures and systems in various fields such as physics, chemistry, biology, material science, and pharmacy.It also explores the expanding interfaces between these fields. Nano-Micro Letters particularly emphasizes the bottom-up approach in the length scale from nano to micro. This approach is crucial for achieving industrial applications in nanotechnology, as it involves the assembly, modification, and control of nanostructures on a microscale.