Defect modulation and in-situ exsolution in Y2Ru2O7@NiFeP/Ru heterostructure for enhanced oxygen evolution reaction

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals Pub Date : 2024-10-10 DOI:10.1007/s12598-024-03006-y

Eunsu Jang, Jihoon Kim, Jangwoo Cho, Jaeho Lee, Jooheon Kim

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引用次数: 0

Abstract

Pyrochlore oxide (Y₂Ru₂O₇) has been identified as a promising catalyst for the oxygen evolution reaction (OER) in advanced green energy strategies. However, its electrochemical inertness necessitates the exploration of an effective strategy to facilitate electronic modulation. This study proposes a surface modification approach involving the integration of defective NiFe (D-NiFe) nanoparticles onto a Y₂Ru₂O₇ (YRO) support (YRO@D-NiFeP/Ru) using a Prussian blue analog (PBA). Numerous cyanide (CN) vacancies are generated through the oxidation treatment of the NiFe PBA grown on the YRO support, yielding a defective PBA precursor (YRO@D-PBA). Subsequent annealing facilitates the transformation to the D-NiFe nanoparticles on the YRO support (YRO@D-NiFeP/Ru), which augments the exposure of Ni³⁺ active sites beneficial for the OER. Moreover, the reduction of Ru cations from YRO results in the exsolution of Ru nanoparticles, which promotes synergistic charge transfer from the nanoparticles to the interior of Y₂Ru₂O₇. Consequently, YRO@D-NiFeP/Ru exhibits a remarkable voltage of 1.49 V at 10 mA·cm⁻² and the lowest Tafel slope of 42.4 mV·dec⁻¹. In addition, a Zn–air battery constructed with YRO@D-NiFeP/Ru exhibits an outstanding power density of 136.2 mW·cm⁻² and high charge–discharge stability, confirming the applicability of YRO@D-NiFeP/Ru in metal-air batteries.

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来源期刊

Rare Metals 工程技术-材料科学：综合

CiteScore

12.10

自引率

12.50%

发文量

2919

审稿时长

2.7 months

期刊介绍： Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.