Journal
JOURNAL OF POWER SOURCES
Volume 457, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.228038
Keywords
Iron sulfides; Oxygen evolution reaction; Oxygen reduction reaction; Bifunctional catalysts; Rechargeable zinc-air batteries
Funding
- National Natural Science Foundation of China [21775022]
- Natural Science Foundation of Guangdong Province [2017A030310603]
- Guangdong Provincial Key Platform and Major Scientific Research Projects for Colleges and Universities [2017KQNCX196]
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Rechargeable zinc-air batteries are promising next-generation energy storage systems due to their large energy density and high safety. However, air-cathodes based on Pt/C and RuO2 suffer from poor catalytic activity and stability in rechargeable zinc-air batteries. Here, we report novel bifunctional Fe7S8/Fe2N nanoparticle (F7S8/ Fe2N NPs) electmcatalysts for the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) by carbonizing the metal-organic framework precursors. Due to the synergistic function between the Fe7S8 and Fe2N with high conductivity and high electrochemical stability, the Fe7S8/Fe2N NPs show outstanding OER and ORR electrocatalytic activities versus precious metal catalysts and pristine Fe2N nanoparticles. Prototype liquid and solid-state zinc-air batteries were also fabricated, and they both show significant rechargeable activities and cyclic stability.
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