Atomically well-mixed quad-metallic sulfide as multi-functional electrocatalyst for overall water electrolysis and zinc-air battery

Precious-metal-free medium entropy sulfide nanoparticles embedded in the sulfur-doped polyacrylonitrile-derived carbon fiber, maximizing the synergistic effects through atomically well-mixed composition, exhibit breakthrough electrocatalytic activities toward water electrolysis and rechargeable ZAB....

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Veröffentlicht in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2023-08, Vol.469, p.143855, Article 143855
Hauptverfasser: Huang, Chun-Lung, He, Zi-Fan, Pai, Jui-Yu, Yang, Yu-Hsiang, Jao, Wen-Yang, Lai, Chi-Yu, Lu, Yi-Ting, Ku, Hao-Yu, Hu, Chi-Chang
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Sprache:eng
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Zusammenfassung:Precious-metal-free medium entropy sulfide nanoparticles embedded in the sulfur-doped polyacrylonitrile-derived carbon fiber, maximizing the synergistic effects through atomically well-mixed composition, exhibit breakthrough electrocatalytic activities toward water electrolysis and rechargeable ZAB. [Display omitted] •FoCoNiMo sulfide NPs were embedded in S-doped PAN carbon nanofibers (SPAN-FCNM) as electrocatalysts.•Medium entropy FCNM sulfide is a highly active trifunctional catalyst for the OER, HER, and ORR.•SPAN-FCNM achieves low η10 of 210 and 55 mV for the OER and HER, respectively.•Electron transfer number of the ORR on SPAN-FCNM is 3.92, excellent for aqueous ZABs. 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 (η) for the oxygen evolution reaction (η10 = 210 mV) and hydrogen evolution reaction (η10 = 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.
ISSN:1385-8947
DOI:10.1016/j.cej.2023.143855