期刊
CHEMICAL ENGINEERING JOURNAL
卷 469, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2023.143855
关键词
Medium entropy sulfides (MES); Oxygen evolution reaction (OER); Hydrogen evolution reaction (HER); Oxygen reduction reaction (ORR); Zinc-air battery (ZAB)
A non-precious-metal medium entropy sulfide embedded in sulfur-doped polyacrylonitrile-derived carbon fiber has been designed to maximize the synergistic effects and exhibits superior trifunctional electrocatalytic performances. The catalyst achieves low overpotentials for both oxygen and hydrogen evolution reactions with a minor efficiency decay under continuous operation. Moreover, a zinc-air battery with the catalyst-coated air electrode demonstrates extraordinary energy efficiency for over 60 hours.
A non-precious-metal medium entropy sulfide (MES) embedded in sulfur-doped polyacrylonitrile-derived carbon fiber (SPAN-FCNM) has been successfully designed to maximize the synergistic effects among the atomically well-mixed constituents and exhibits superior trifunctional electrocatalytic performances toward the overall alkaline water electrolysis and oxygen reduction reactions. This catalyst achieves low overpotentials (& eta;) for the oxygen evolution reaction (& eta;10 = 210 mV) and hydrogen evolution reaction (& eta;10 = 55 mV) with a minor efficiency decay of 7.5% under 100-h continuous operation in 1 M KOH at 500 mA cm-2. In addition, a zinc-air battery with the SPAN-FCNM-coated air electrode exhibits an extraordinary energy efficiency (1st cycle = 60.9%; 90th cycle = 58.9%) at the industrially relevant discharge/charge current density of 50 mA cm-2 for over 60 h. Therefore, rational design to maximize the synergistic effects through atomically well-mixed composition, as realized in entropy-maximized materials, successfully demonstrates the breakthrough in the catalyst design.
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