Tailoring Nanocrystalline/Amorphous Interfaces to Enhance Oxygen Evolution Reaction Performance for FeNi‐Based Alloy Fibers

Author:

Li Bo1,Jiang Si‐Da123ORCID,Fu Qiang2,Wang Ran4,Xu Wei‐Zhi1,Chen Jun‐Xiang5,Liu Chen3,Xu Ping6,Wang Xian‐Jie2,Li Jian‐Hua7,Fan Hong‐Bo3,Huo Jun‐Tao8,Sun Jian‐Fei1,Ning Zhi‐Liang1,Song Bo4

Affiliation:

1. School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China

2. School of Physics Harbin Institute of Technology Harbin 150001 China

3. National Key Laboratory of Space Environment and Matter Behaviors Harbin Institute of Technology Harbin 150001 China

4. National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin 150001 China

5. State Key Laboratory of Structural Chemistry, and Fujian Provincial Key Laboratory of Materials and Techniques toward Hydrogen Energy Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China

6. School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 China

7. Beijing Engineering Research Center of Detection and Application for Weak Magnetic Field Department of Physics University of Science and Technology Beijing Beijing 100083 China

8. Key Laboratory of Magnetic Materials and Devices, and Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China

Abstract

AbstractEfficient oxygen evolution reaction (OER) electrocatalysts play a pivotal role in water electrolysis, notably for industrial high current densities (>1000 mA cm−2). Crystalline/amorphous heterostructure interfaces have proven to be advantageous for enhancing the OER activities of electrocatalytic materials. However, the constructing and tailoring for crystalline/amorphous interfaces still remain a great challenge due to the destruction of active substrates by intricate post‐treatment. Here, a strategy to tailor nanocrystalline/amorphous (N/A) interface and optimize the electrocatalytic performance of as‐cast N/A alloys by adjusting the size of nanocrystals is proposed. The N/A alloy fibers obtained based on this strategy exhibit superior OER performance with an overpotential of 227 mV (@10 mA cm−2), maintaining stability for over 1000, 600, and 240 h under high current densities of 500, 1000, and 1800 mA cm−2, respectively. Theoretical calculations and material characterizations reveal that N/A interfaces, facilitated by appropriately sized nanocrystals possessing a loose atomic arrangement, favorable surface electronic structure, advantageous local coordination, and optimal O‐contained intermediate adsorption, can yield abundant active sites without compromising stability. This study not only provides a deeper understanding of the tailoring mechanism of N/A interfaces but also offers a new design perspective for the development of cost‐effective, industrial‐grade electrocatalysts.

Funder

National Natural Science Foundation of China

National Science Fund for Distinguished Young Scholars

Natural Science Foundation of Heilongjiang Province

Fundamental Research Funds for the Central Universities

National Key Research and Development Program of China

Publisher

Wiley

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