IF 13 2区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Small Pub Date : 2025-02-16 DOI:10.1002/smll.202412265
Daojin Zhou, Yuxin Chang, Jialun Tang, Pengfei Ou
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引用次数: 0

摘要

在分水阳极中,钌已成为铱的理想替代品。然而,在工业相关的工作条件下,钌会过度氧化并溶解。为了提高氧进化反应电催化剂的活性和稳定性,我们合成了一种低 Ru 浓度的等结构金红石型 MnRu 氧化物(Mn0.75Ru0.25O2),并开发了一个不对称的 Mn-O-Ru 双位点活性中心。它在 10 mA cm-2 下显示出 154 mV 的过电位,并能在 200 mA cm-2 下稳定运行 670 小时,降解率为 29 uV/h-1。质子交换膜水电解槽可在 1 A cm-2 下稳定运行 700 小时,降解率为 53 uV/h-1。结构分析和同位素标记表明,Mn-O-Ru 双位点活性中心的不对称性质与等结构金红石 Mn0.75Ru0.25O2 中阳离子和晶格氧的稳定有关,这种不对称性质促进了沿自由基耦合途径的氧进化反应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Mn0.75Ru0.25O2 with Low Ru Concentration for Active and Durable Acidic Oxygen Evolution

Mn0.75Ru0.25O2 with Low Ru Concentration for Active and Durable Acidic Oxygen Evolution
Ruthenium has emerged as a promising alternative to iridium in water-splitting anodes. However, it becomes overoxidized and dissolves at industry-relevant working conditions. To enhance the activity and stability of electrocatalysts for oxygen evolution reaction, an isostructural rutile MnRu oxide with low Ru concentration (Mn0.75Ru0.25O2) is synthesized and an asymmetric Mn-O-Ru dual-site active center is developed. It exhibits 154 mV overpotential at 10 mA cm−2 and can operate stably at 200 mA cm−2 for 670 h with a degradation rate of 29 uV/h−1. A proton exchange membrane water electrolyzer achieves stable operation at 1 A cm−2 for 700 h with a degradation rate of 53 uV h−1. Structural analysis and isotopic labeling correlate the asymmetric nature of the Mn-O-Ru dual-site active center, which facilitates the oxygen evolution reaction along the radical coupling pathway, with the stabilization of the cations and the lattice oxygen in isostructural rutile Mn0.75Ru0.25O2.
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来源期刊
Small
Small 工程技术-材料科学:综合
CiteScore
17.70
自引率
3.80%
发文量
1830
审稿时长
2.1 months
期刊介绍: Small serves as an exceptional platform for both experimental and theoretical studies in fundamental and applied interdisciplinary research at the nano- and microscale. The journal offers a compelling mix of peer-reviewed Research Articles, Reviews, Perspectives, and Comments. With a remarkable 2022 Journal Impact Factor of 13.3 (Journal Citation Reports from Clarivate Analytics, 2023), Small remains among the top multidisciplinary journals, covering a wide range of topics at the interface of materials science, chemistry, physics, engineering, medicine, and biology. Small's readership includes biochemists, biologists, biomedical scientists, chemists, engineers, information technologists, materials scientists, physicists, and theoreticians alike.
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