Abstract
Herein, a novel 3D hierarchically hollow-shell porous structure of iron cobalt oxynitride anchored nitrogen and sulfur-doped bamboo-like carbon nanotubes (FeCo2ON/NSCNTs) are fabricated using a pyrolysis of Fe doped-ZIF-8/67@S-doped g-C3N4. The strong synergistic effects between hollow FeCo2ON, NC nanoshells, and NSCNTs lead to accelerating the mass and electron transfer between the active sites which is favorable for electrochemical activities. The introduction of Fe into the nanohybrid and nitrogen/sulfur atoms doped on CNTs leading to increase electrical conductivity and decrease the activation energy barrier of the rate-determining step. The electrocatalyst exhibit a more half-wave potential of 0.903 V vs. RHE, outperform to Pt/C. Moreover, the low overpotential of 268 mV at 10 mA cm−1 is attained for FeCo2ON/NSCNTs. Its superiority as the air-electrode electrocatalyst corroborates in a Zn–air battery with a higher power density and specific capacity (235.4 mW cm−2, and 781 mAh g−1, respectively) than Pt/C + RuO2 (184.6 mW cm−2, and 701 mAh g−1).
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The authors would like to acknowledge from Hydrogen and Fuel cell Research Laboratory, Department of Chemistry, Yasouj University.
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PA contributed in conceptualization, experimental design, carried out measurements and wrote the original draft, MK were involved in supervision, responsible for resources and participated in writing—review and editing, AA carried out measurements and wrote the original draft.
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Akbarian, P., Kheirmand, M. & Asadi, A. Bimetallic 3D hollow-nanoshell FeCo-oxynitride/N and S co-doped carbon nanotubes as a robust bifunctional oxygen electrocatalyst for rechargeable Zn-air batteries. J Mater Sci 58, 8889–8907 (2023). https://doi.org/10.1007/s10853-023-08551-y
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DOI: https://doi.org/10.1007/s10853-023-08551-y