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

Bo Li, Si Da Jiang*, Qiang Fu, Ran Wang, Wei Zhi Xu, Jun Xiang Chen*, Chen Liu, Ping Xu, Xian Jie Wang, Jian Hua Li, Hong Bo Fan, Jun Tao Huo, Jian Fei Sun, Zhi Liang Ning*, Bo Song

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Efficient 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.

Original languageEnglish
Article number2413088
JournalAdvanced Functional Materials
Volume35
Issue number2
DOIs
Publication statusPublished - 9 Jan 2025
Externally publishedYes

Keywords

  • alkaline water splitting
  • alloy fiber
  • nanocrystalline/amorphous interface
  • oxygen evolution reaction

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Li, B., Jiang, S. D., Fu, Q., Wang, R., Xu, W. Z., Chen, J. X., Liu, C., Xu, P., Wang, X. J., Li, J. H., Fan, H. B., Huo, J. T., Sun, J. F., Ning, Z. L., & Song, B. (2025). Tailoring Nanocrystalline/Amorphous Interfaces to Enhance Oxygen Evolution Reaction Performance for FeNi-Based Alloy Fibers. Advanced Functional Materials, 35(2), Article 2413088. https://doi.org/10.1002/adfm.202413088