Zeolitic imidazolate framework-derived Co-Fe@NC for rechargeable hybrid sodium-air battery with a low voltage gap and long cycle life

Haixing Gao, Siqi Zhu, Yao Kang, Duc Anh Dinh, Kwan San Hui, Feng Bin, Xi Fan, Fuming Chen, Azhar Mahmood, Jianxin Geng, Weng Chon Max Cheong, Kwun Nam Hui

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Developing low-cost, efficient electrocatalysts for the air electrode of high-performance rechargeable hybrid sodium-air batteries (HSABs) remains challenging. Herein, efficient bimetallic nanoparticles encapsulated in nitrogen-doped carbon (Co-Fe@NC) were developed for the oxygen reduction and evolution reactions in HSABs. The bimetallic Co-Fe@NC catalyst outperformed its monometallic counterparts in the oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) activity. The assembled HSAB, utilizing the Co-Fe@NC in the air electrode, exhibited a smaller voltage gap of 0.27 V and a higher power density of 5.39 mW/cm2 compared with the air electrode utilizing Pt/C + RuO2 (0.55 V, 4.79 mW/cm2). Furthermore, the round-trip efficiency of the assembled HSAB is up to 75.37% after 700 h of cycling at 0.1 mA/cm2, outperforming the benchmark HSAB with Pt/C + RuO2 (65.76% after 400 h). This work presents a promising strategy to prepare low-cost, efficient electrocatalysts to substitute the precious catalyst Pt/C + RuO2 in HSABs or other metal-air batteries for practical applications.

Original languageEnglish
Pages (from-to)1662-1671
Number of pages10
JournalACS Applied Energy Materials
Volume5
Issue number2
Early online date2 Feb 2022
DOIs
Publication statusPublished - 28 Feb 2022

Keywords

  • bifunctional electrocatalyst
  • bimetallic materials
  • hybrid sodium−air battery
  • MOF-derived materials
  • zeolitic imidazolate frameworks (ZIF)

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