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Formation of hollow frameworks of dual-sided Fe/Fe3C@N-doped carbon nanotubes as bifunctional oxygen electrocatalyst for Zn-air batteries
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DOI：10.1016/j.apcatb.2022.121760.png)
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Abstract
En 中文
Rational design of effective bifunctional inexpensive oxygen electrocatalyst is highly important for Zn-air bat-teries (ZABs), which can accelerate both oxygen reduction/evolution reactions at the oxygen electrode. Herein, we present the formation of hierarchical hollow frameworks of dual-sided Fe/Fe3C@N-doped carbon nanotubes (FNCHFs) through a template-engaged method. Benefitting from the synergistic effect between the robust hollow frameworks and in-situ grown dual-sided N-doped carbon nanotubes, the FNCHF electrocatalyst presents enhanced mass/electron transport with high structural stability. As a result, the FNCHFs based bifunctional oxygen electrode demonstrates a desirable oxygen electrocatalytic activity and stability with a half-wave po-tential of 0.863 V for oxygen reduction and an overpotential of 340 mV to reach the current density of 10 mA cm(-2) for oxygen evolution. The corresponding ZAB exhibits a high peak power density of 206 mW cm(-2), a high specific capacity of 781 mAh g(Zn)(-1), and a good cycling stability more than 300 h.
Keywords:
Hollow nanostructures
Carbon nanotubes
Bifunctional oxygen electrocatalyst
Zn-air batteries
Journal
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IF:
20.3
Papers:
215
Citations:
16.3W
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