Improvement in ORR Durability of Fe Single-Atom Carbon Catalysts Hybridized with CeO₂ Nanozyme.

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Nano Letters Pub Date : 2024-07-24 Epub Date: 2024-07-11 DOI:10.1021/acs.nanolett.4c02178

Yiwei Qiu, Yu Wu, Xiaoqian Wei, Xin Luo, Wenxuan Jiang, Lirong Zheng, Wenling Gu, Chengzhou Zhu, Yusuke Yamauchi

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Abstract

FeNC catalysts are considered one of the most promising alternatives to platinum group metals for the oxygen reduction reaction (ORR). Despite the extensive research on improving ORR activity, the undesirable durability of FeNC is still a critical issue for its practical application. Herein, inspired by the antioxidant mechanism of natural enzymes, CeO₂ nanozymes featuring catalase-like and superoxide dismutase-like activities were coupled with FeNC to mitigate the attack of reactive oxygen species (ROS) for improving durability. Benefiting from the multienzyme-like activities of CeO₂, ROS generated from FeNC is instantaneously eliminated to alleviate the corrosion of carbon and demetallization of metal sites. Consequently, FeNC/CeO₂ exhibits better ORR durability with a decay of only 5 mV compared to FeNC (18 mV) in neutral electrolyte after 10k cycles. The FeNC/CeO₂-based zinc-air battery also shows minimal voltage decay over 140 h in galvanostatic discharge-charge cycling tests, outperforming FeNC and commercial Pt/C.

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改善与 CeO2 纳米酶杂化的铁单原子碳催化剂的 ORR 耐久性。

在氧还原反应（ORR）中，FeNC 催化剂被认为是铂族金属最有前途的替代品之一。尽管对提高 ORR 活性进行了广泛的研究，但 FeNC 不理想的耐久性仍然是其实际应用中的一个关键问题。在此，受天然酶抗氧化机制的启发，将具有类似催化酶和超氧化物歧化酶活性的 CeO2 纳米酶与 FeNC 相结合，以减轻活性氧（ROS）的侵蚀，从而提高耐久性。得益于 CeO2 的多酶活性，FeNC 产生的 ROS 可瞬间消除，从而减轻碳的腐蚀和金属位点的脱金属。因此，在中性电解质中，FeNC/CeO2 表现出更好的 ORR 耐久性，在 10k 周期后的衰减仅为 5 mV，而 FeNC 则为 18 mV。基于 FeNC/CeO2 的锌-空气电池在电静态放电-充电循环测试中 140 小时的电压衰减也很小，优于 FeNC 和商用 Pt/C。

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

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.