CNTs/CNF-supported multi-active components as highly efficient bifunctional oxygen electrocatalysts and their applications in zinc-air batteries
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Rational construction of active components has been the biggest challenge in preparing efficient bifunctional oxygen electrocatalysts. Herein, electrospinning and chemical vapor deposition (CVD) were employed to embed active species including FeCo nanoparticles, MNx (M = Fe, Co), and FePx in porous and graphitized carbon nanotubes (CNTs)/carbon nanofiber (CNF). The as-prepared FeCo@CoNx@FePx/C exhibited a half-wave potential as high as 0.86 V in oxygen reduction reaction (ORR) and low oxygen evolution reaction (OER) overpotential of 368 mV at 10 mA·cm−2, which are superior to Pt/C (0.83 V) and IrO2 (375 mV) respectively. The assembled Zn-air battery (ZAB) showed a high energy efficiency (Edischarge/Echarge) of 65% at 20 mA·cm−2 and stabilized for 700 charge–discharge cycles. The spectroscopic and microscopic characterizations evidenced that the outstanding bifunctionality of the electrocatalyst can be ascribed to three main reasons: First, FeCo nanoparticles are rich in MOH/MOOH active sites for OER, and FePx/CNTs constructed with CVD also modulate electronic structure to improve electron transfer; second, both MNx in carbon matrix and FePx/CNTs are highly active towards ORR; third, the CNTs/CNF are highly porous and graphitized, which promotes mass transport and improves electrical conductivity and stability of the electrocatalysts. This work gives important implications on the design of bifunctional electrocatalysts.
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CNTs/CNF-supported multi-active components as highly efficient bifunctional oxygen electrocatalysts and their applications in zinc-air batteries
)
Abstract
Rational construction of active components has been the biggest challenge in preparing efficient bifunctional oxygen electrocatalysts. Herein, electrospinning and chemical vapor deposition (CVD) were employed to embed active species including FeCo nanoparticles, MNx (M = Fe, Co), and FePx in porous and graphitized carbon nanotubes (CNTs)/carbon nanofiber (CNF). The as-prepared FeCo@CoNx@FePx/C exhibited a half-wave potential as high as 0.86 V in oxygen reduction reaction (ORR) and low oxygen evolution reaction (OER) overpotential of 368 mV at 10 mA·cm−2, which are superior to Pt/C (0.83 V) and IrO2 (375 mV) respectively. The assembled Zn-air battery (ZAB) showed a high energy efficiency (Edischarge/Echarge) of 65% at 20 mA·cm−2 and stabilized for 700 charge–discharge cycles. The spectroscopic and microscopic characterizations evidenced that the outstanding bifunctionality of the electrocatalyst can be ascribed to three main reasons: First, FeCo nanoparticles are rich in MOH/MOOH active sites for OER, and FePx/CNTs constructed with CVD also modulate electronic structure to improve electron transfer; second, both MNx in carbon matrix and FePx/CNTs are highly active towards ORR; third, the CNTs/CNF are highly porous and graphitized, which promotes mass transport and improves electrical conductivity and stability of the electrocatalysts. This work gives important implications on the design of bifunctional electrocatalysts.
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Acknowledgements
The authors acknowledge the grants from the National Natural Science Foundation of China (No. 22004085) and Regional Joint Fund of Guangdong Province (No. 2019A1515111054). The authors also thank the Instrumental Analysis Center of Shenzhen University for the scanning electron microscopy (SEM) and TEM characterizations. The authors would like to thank Yaping Li for Shiyanjia Lab (www.shiyanjia.com) for the XAS analysis.
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