Ce-doping induced structure evolution in FeNi-based (oxy)hydroxide for highly efficient oxygen evolution reaction

Zhonghu Liu, Junhui Hu, Shuo Li, Cheng Lu, Kun Feng*, Shifeng Wang, Jun Zhong

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Structure evolution of the catalyst typically plays a key role in determining the catalytic activity in harsh reaction environment. Here we report a doping-reconstruction strategy to prepare catalyst for highly efficient oxygen evolution reaction (OER). Ce-doping has been induced in FeNi metal-organic frameworks (MOFs) to change the microstructure, which can further lead to the in-situ formation of active (oxy)hydroxides. As a result, the obtained Ce-FeNiOOH shows a low overpotential of 196 mV at 10 mA cm−2, with a small Tafel slope of 33.5 mV dec−1 and a good stability for 100 h. Moreover, by coupling with Pt/C, the two-electrode cell can achieve an excellent performance for overall water splitting with a low voltage of 1.44 V at 10 mA cm−2 (1.59 V at 100 mA cm−2). Synchrotron radiation spectroscopy reveals that Fe-O-Ce microstructure has been created with Ce-doping, which plays a key role for the further transition from MOFs to (oxy)hydroxide during OER.

    Original languageEnglish
    Article number157590
    Number of pages7
    JournalApplied Surface Science
    Volume631
    Early online date24 May 2023
    DOIs
    Publication statusPublished - 15 Sept 2023

    Keywords

    • Ce-doping
    • Microstructure
    • Oxygen evolution reaction
    • Reconstruction
    • X-ray absorption spectroscopy

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